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反射型コリメータ、保護膜付き銀コーティング


  • Achromatic Collimator/Coupler
  • Protected Silver Reflective Coating
  • Ø2 mm, Ø4 mm, Ø8.5 mm, or Ø12 mm Collimated Beam
  • FC/PC, FC/APC, or SMA Connector

RC12SMA-P01

Ø12 mm Beam

RC08APC-P01

Ø8.5 mm Beam

RC04FC-P01

Ø4 mm Beam

RC02FC-P01

Ø2 mm Beam

RC08APC-P01

Reflective Collimator
with Patch Cord
Shown Mounted
to a Ø1/2" Post

Related Items


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Key Specificationsa
Item # PrefixRC02RC04RC08RC12
Collimated Beam
(0.13 NA Fiber)
Ø2 mmØ4 mmØ8.5 mmØ12 mm
Numerical Aperture (NA)0.400.360.1670.216
Reflected Focal Length (RFL)7 mm15 mm33 mm50.8 mm
External Threading of Housing SM05 (0.535"-40)SM1 (1.035"-40)
Clear ApertureØ7.5 mmØ11 mmØ22 mm
Reflectance (Avg.)

>97.5% (450 nm - 2 μm)
>96% (2 - 20 μm)

  • 詳細については「仕様」タブをご参照ください。
Monting the RC02 into an Optical Mount
Click to Enlarge

左はキネマティックマウントKM05(/M)を取り付けたコリメータRC02です。右は、Ø25.4 mm(Ø1インチ)用キネマティックマウントPOLARIS-K1を取り付けたコリメータRC02です。どちらのマウントもビームのアライメントにご使用いただけます。
Reflective Collimator Cross Section光ファイバからの光をコリメート
(反対にコリメート光をファイバに入射することも可能) 

特長

  • ミラーの反射帯全域でコリメートビームが得られるアクロマティック設計
  • 保護膜付き銀コーティング(450 nm~20 µm)による高反射
  • マルチモードファイバに多色光を結合する際の使用に適しています。
  • 表面粗さ:< 100 Å(RMS)
  • 開口:Ø7.5 mm、Ø11 mm、Ø22 mm
  • 非磁性ステンレススチール製筐体

保護膜付き銀コーティングの反射型コリメータは、90°軸外放物面(パラボリック)ミラーをベースにしています。レンズと違い、金属製ミラーの焦点距離は広い波長範囲にわたり一定です。パラボリックミラーコリメータはそれぞれの光波長に合わせた調整が不要なので多色光の用途に適しています。ダイヤモンド切削工程や工具傷によりミラー面での散乱が633 nmで最小でも2%程度に制限されます。 一般的には多数の波長をコリメートするシステムや、赤外光のコリメート・結合、大径マルチモードファイバに多色光を結合する用途などに使用されています。

この保護膜付き銀コーティングの反射型コリメータは450 nm~20 µmの波長範囲内で優れた反射率を有します。詳細は「仕様」タブをご覧ください。 可視域と赤外域で多波長システムに用いる場合、こちらの反射型コリメータは多色光をコリメートして大きなコア径のマルチモードファイバに入射したり、反対に光ファイバから出射された多色光をコリメートしたりすることができます。なお、一般的にマルチモードファイバからの出力光は完全にコリメートすることはできません。 マルチモードパッチケーブルからの光をコリメートする場合、筐体で光がクリッピングされないよう、ファイバのNAはそれぞれ<0.40(RC02)、<0.36(RC04)、<0.167(RC08)、<0.216(RC12)に抑えてください。ファイバからの光結合を最適化する方法については「コリメートチュートリアル」タブをご覧ください。 

反射型コリメータRC02、RC04、RC08の筐体にはSM05外ネジ、RC12の筐体にはSM1外ネジが付いています。よって、それぞれSM05ネジ付きオプトメカニクス用レンズマウントLMR05/M、ならびにSM1ネジ付きレンズマウントLMR1/M等に直接取り付け可能です。反射型コリメータRC02の背面はØ12.7 mm(1/2インチ)に機械加工されているため、Ø12.7 mm(1/2インチ)およびØ12 mmキネマティックマウントに直接取り付けることができます(右写真、左側参照)。また、RC02、RC04、RC08は、直接Ø25 mm~Ø25.4 mm(Ø1インチ)キネマティックマウントに取り付けることもできます。具体的には、まず筐体の前部についている刻み目付きリングを取り外し、次にØ25.4 mm(Ø1インチ)ザグリ穴の背面にある縁を挟んでリングを取付け、最後にスパナレンチSPW909または調整機能付きスパナレンチSPW801でリングをねじ込むことでマウントできるようになります。コリメータはその後、マウントの止めネジ(セットスクリュ)を締め付けることで固定できます。セットアップは右の写真でご覧いただけます。

当社では250~450 nm用UV域強化アルミコーティング付き反射型コリメータの製品もご用意しております。

反射型コリメータ用ファイバーパッチケーブル
当社では光の結合ならびにコリメートに使用するシングルモード偏波保持、またはマルチモードの光ファイバーパッチケーブルをご用意しております。また低挿入損失パッチケーブルもございます。このケーブルは、低挿入損失・高透過率を実現するために、コア同心度の良好なシングルモードファイバを選別したものです。標準品の中からお客様の要望に適したパッチケーブルが見つからない場合は、カスタムパッチケーブルもご用意しておりますのでお気軽にお問い合わせください。 

Protected Silver at 45 Degree Incident Angle
Click to Enlarge

保護膜付き銀の反射率の生データのExcelシートはこちらからダウンロードいただけます。
Common Specifications
CoatingProtected Silver
Wavelength Range450 nm - 20 µm
Reflectance (Avg)>97.5% (0.45 - 2 µm)
>96% (2 - 20 µm)
Surface Quality40-20 Scratch-Dig
Surface Roughness<100 Å RMS
Reflected Wavefront Error
λ/4 at 633 nm
Full Angle Beam Divergencea0.02°
Pointing Errorb
(FC/PC- and FC/APC-Connectorized Models)
<10 mrad
  • ビーム広がり角(近似値) 。広がり角はファイバのMFDに基づきます。 0.02°はファイバS460-HP、波長543 nmの条件で得られた数値です。
  • SMAコネクタは金属フェルールなのでポインティングエラーの値は保証されません。

 

Item #Fiber ConnectoraClear ApertureBeam DiameterbMirror NAEFLcPFLd
RC02FC-P01FC/PCØ7.5 mm2 mm0.407 mm3.5 mm
RC04FC-P01Ø11 mm4 mm0.3615 mm7.5 mm
RC08FC-P01Ø11 mm8.5 mm0.16733 mm16.5 mm
RC12FC-P01Ø22 mm12 mm0.21650.8 mm25.4 mm
RC02APC-P01FC/APCØ7.5 mm2 mm0.407 mm3.5 mm
RC04APC-P01Ø11 mm4 mm0.3615 mm7.5 mm
RC08APC-P01Ø11 mm8.5 mm0.16733 mm16.5 mm
RC12APC-P01Ø22 mm12 mm0.21650.8 mm25.4 mm
RC02SMA-P01SMAØ7.5 mm2 mm0.407 mm3.5 mm
RC04SMA-P01Ø11 mm4 mm0.3615 mm7.5 mm
RC08SMA-P01Ø11 mm8.5 mm0.16733 mm16.5 mm
RC12SMA-P01Ø22 mm12 mm0.21650.8 mm25.4 mm
  • FC/PCおよびFC/APCシリーズはワイドキーコネクタを使用
  • 近似値、ファイバNAは0.13
  • 有効焦点距離
  • 軸上焦点距離: 軸外パラボリックミラーは個別に作るか、軸上パラボリックミラーから切り取ることもできます。軸外パラボリックミラーが軸上パラボリックミラーから切り取 られる場合、軸上焦点距離(PFL)の仕様は上昇します。PFL(軸上焦点距離)は、軸上ミラーのEFL(有効焦点距離)です。詳細は右図をご覧くださ い。

Click to Enlarge
高NAファイバ:赤色の線は、コリメータの筐体によってクリッピングされるビームのエンベロープを示しています。緑色の点線は、ビーム中でOAPミラーによってコリメートされる部分を示しています。

Click to Enlarge
低NAファイバ:緑色の線は、OAPミラーによってコリメートされるビームのエンベロープを示しています。

必要とされる出力ビーム径に応じたミラーの選択

ファイバーパッチケーブルからの光のコリメートに反射型ファイバーコリメータを使用する際、多くの場合、適切なミラーは必要な出力ビーム径とファイバの開口数(NA)に基づいて選択されます。ファイバからの光の発散角はファイバのNAによって決定されます。ファイバのNAと発散半角の関係は、下記の式で表されます。

ここでθは発散半角を表し、また周囲の媒質は空気(n = 1)であることを仮定しています。発散光がOAPミラーに入射したときに得られるコリメート光の径は、OAPの反射焦点距離(RFL)とファイバのNAに関係し、小角度近似を用いると下記の式で求めることができます。

ここでdはビーム径です。ファイバのNA値の決め方によって、上記の式で得られるビーム径は、1/e2ではなく5%あるいは1%での径となる場合があります。 コリメートビームの理論的な発散角は下記の式で求められます。 

ここでθcはコリメート後のビームの発散角です。 コリメート後の発散角は比較的小さくなるため、こちらの反射型コリメータは、低NAのシングルモードファイバーパッチケーブルからの出力光をコリメートするのに適しています。

ビームは所定のビーム径まで理論的には拡大できますが、マルチモードファイバからの光をコリメートする場合には主な制限事項が2つあります。まず、ほとんどのマルチモードファイバは発散角が大きく(例:NA = 0.22、0.39または0.50)、光はOAPミラーにたどり着く前にコリメータの筐体でクリッピングされます(右の図参照)。従って、マルチモードパッチケーブルからの光をコリメートする場合、筐体で光がクリッピングされないよう、ファイバのNAはそれぞれ<0.40(RC02)、<0.36(RC04)、<0.167(RC08)、<0.216(RC12)に抑えてください。また、発散角はわずかにファイバのコア径の影響も受けますので、コア径が大きくなるほど、NAの最大許容値は若干小さくなります。ビーム径が反射型コリメータの開口よりも大きい場合、出力ビームはコリメータの筐体でクリッピングされます。どちらのケースも出力ビームの品質低下につながります。

下表は、ミラーの反射焦点距離とシングルモードならびにマルチモードファイバのNAが与えられたときの、出力ビーム径を示しています。

Calculated Beam Diameter for Given Fiber NA and RFL
Fiber NA0.13 NA, Single Mode0.22 NA, Multimode0.39 NA, Multimode
7 mm RFL (Item # Prefix RC02)1.8 mm3.1 mm5.5 mm
15 mm RFL (Item # Prefix RC04) 3.9 mm6.6 mm11.7 mma
33 mm RFL (Item # Prefix RC08) 8.6 mm14.5 mma,b25.7 mma,b
50.8 mm RFL (Item # Prefix RC12)13.2 mm22.4 mma,b39.6 mma,b
  • ファイバのNAが大きいため、出力ビームはコリメータの筐体でクリッピングされます。
  • 出力ビーム径は、反射型コリメータの開口部より大きくなっています。

ファイバーコリメーターセレクションガイド

コリメータのタイプまたは画像をクリックすると、各コリメータの詳細がご覧いただけます。 

Type Description
固定型FC、APC、SMAコネクタ付きファイバーコリメータFixed SMA Fiber Collimatorこのファイバーコリメーターパッケージは、FC/PC、FC/APC、またはSMAコネクタ付きファイバからの光をコリメートするようアライメント済みです。 各コリメーターパッケージは、405 nm~4.55 µmの波長で回折限界までアライメントされています。 規定の波長以外でコリメータを使用することも可能ですが、球面レンズの有効焦点距離の波長依存によって引き起こされる色収差により、最適動作は設計波長のみです。
エアスペース型複レンズ、大径ビームコリメータAir-Spaced Doublet Fiber Collimator大径ビーム(Ø5.3 mm~Ø8.5 mm)用FC/PC、SMA、FC/APCエアスペース型複レンズコリメータをご用意しています。 このコリメーターパッケージは、FCやSMAコネクタ付きファイバの先端からの出力光をコリメートし、設計波長で回折限界性能を発揮するよう、製造時にアライメントを済ませてご提供いたします。
トリプレットコリメータTriplet Fiber Collimator当社の高品質なトリプレットコリメーターパッケージは、エアスペーストリプレットレンズを使用し、非球面レンズコリメータと比べて優れたビーム品質が得られます。収差の小さいトリプレットデザインの利点は、1に近いM2値(ガウス)と、広がり角や波面エラーが小さくなることなどです。
マルチモードファイバ用アクロマティックコリメータTriplet Fiber Collimator当社の高NAアクロマティックコリメータは、メニスカスレンズとアクロマティック複レンズを組み合わせることで、可視スペクトル域において球面収差の少ない優れた性能を発揮します。高NAのマルチモードファイバ用に設計されているため、オプトジェネティクスやファイバーフォトメトリの用途に適しています。
反射型コリメータReflective Fiber Collimator当社の金属コーティング反射型コリメータは90°軸外パラボリックミラーをベースにしています。レンズと違い、ミラーは広い波長範囲にわたり焦点距離を維持します。この固有の特性により、パラボリックミラーコリメータは幅広い光波長に合わせた調整が不要で、多色光用途に適しています。当社の反射型コリメータはシングルモードファイバに適しています。
FiberPortFiberport Fiber Collimatorこちらのコンパクトかつ超安定型のFiberPortマイクロポジショナは、FC/PC、FC/APCまたはSMAコネクタ付き光ファイバからの光を入出力するための、安定で使いやすいプラットフォームです。 シングルモード、マルチモードまたは偏波保持(PM)ファイバと一緒に使え、ポストやステージ、プラットフォーム、またはレーザへ取り付けることができます。 組み込まれている非球面またはアクロマティックレンズは、ARコーティングを3種類から選択でき、5軸のアライメント調整(3つの移動調整と2つの角度調整)が可能です。 コンパクトでアライメントの長時間安定性を実現しているFiberPortは、ファイバへの光の入射やコリメート、またはOEM用途に適しています。
調整可能ファイバーコリメータAdjustable Fiber Collimatorこのコリメータは、FC/PCやFC/APCコネクタに接続するよう設計され、またARコーティング付き非球面レンズが含まれています。 非球面レンズとFCコネクタ付きファイバ端との距離は、焦点距離変化の補正や、要求される距離や波長での再コリメートに合わせて調整できます。
大径ビームファイバーコリメータlarge beam collimators当社の大径ビームファイバーコリメータは3種類の波長範囲にわたって40 mmまたは80 mmの有効焦点距離(EFL) を有し、FC/PC、FC/APCまたはSMA905コネクタ付きでご用意しています。4つのレンズを使用したエアスペース型設計により、非球面レンズを用いたコリメータと比べてビーム品質は高く(1に近いM2)、波面誤差は小さくなります。このように、こちらのコリメータは調整幅が大きいため、自由空間用コリメータまたはカプラとしてご使用いただけます。2個セットで使用すると、自由空間光のビームウェストを調整できるため、長距離通信の用途に役立ちます。 
ズーム機能付きファイバーコリメータZoom Fiber Collimatorこちらのコリメータは、ビームをコリメートしたまま、6~18 mmの範囲で焦点距離を変えることができます。 その結果、コリメートしたままビームサイズの変更が可能です。 このデバイスは、用途に適した固定のファイバーコリメータを探す手間を省けるという利点に加え、1つで様々な幅広い用途に対応することができます。 FC/PC、FC/APCまたはSMA905コネクタ付きで、3種類の反射防止コーティングでご用意しております。
ピグテール付きコリメータPigtailed Fiber Collimator1メートルのシングルモードまたはマルチモードファイバ付きのピグテール付きコリメータは、ファイバとステンレススチール製筐体にしっかり埋め込まれたARコーティング付き非球面レンズを備え、532、830、1030、1064、1310、1550 nmの6波長のいずれかで適切なコリメートとなります。コーティング範囲内のどの波長でもコリメートできますが、設計波長からずれると結合損失が増加します。 
GRINレンズコリメータGRIN Fiber Collimator当社のGRINレンズファイバーコリメータは、630~1550 nm のいずれかにアライメントされ、FCまたはAPCコネクタ付きもしくはコネクタ無しをお選びいただけます。 開口Ø1.8 mmのGRINレンズコリメータは、ファイバへの入射の後方反射を抑えるARコーティングが施され、標準シングルモードファイバまたはグレーデッドインデックス(GI)マルチモードファイバへ結合されています。
GRINレンズGRIN Lensこの630、830、1060、1300、1560 nm用のARコーティングが施された屈折率分布型(GRIN)レンズは、光ファイバから出力された光が、自由空間を通って、再度別のファイバへ入射する用途に使用されます。 また半導体レーザからのファイバへの入射光の結合や、ファイバから出射してディテクタへ集光したり、レーザ光をコリメートする際にも適しています。このGRINレンズは当社のピグテール付きガラスフェルールやGRINレンズ/フェルール用スリーブとお使いいただけます。

Posted Comments:
Arthur van Wijk  (posted 2019-10-30 09:23:27.96)
We were advised to use a RC04 to refocus a collimated beam (simply the reverse of collimating). Unfortunately this does not work. It seems that the spotsize is too big. It doesn't even work with MM fibers. My guess is that this demands a very high beam quality, or is there something else at play? Using a single molded aspheric lens works much better! Of course you need to mount the fiber on a XYZ stage with high precision micrometers, but we now have less absorption than with the objective we used before. We'll keep the RC04FC for whenever we need a collimator.
mdiekmann  (posted 2019-11-06 02:07:52.0)
Thank you for contacting Thorlabs! In order to optimize the incoupling into a reflective collimator, the collimator should be mounted into a tip/tilt plate.
Jan Kaster  (posted 2019-09-11 07:54:47.517)
Hi there, I am thinking about using these for a stray light measuring setup, where a extraordinarily clean beam is required (2% at 633nm is already a bit rough). Would it be possible to achieve a better surface roughness (e.g. 1nm or at least 5nm) and quality (e.g. 10/5 or at least 20/10)? Would it be possible to apply a black coating on the inner tubes, e.g. Acktar Magic Black, to reduce stray light from the fiber? Thanks and kind regards, Jan
wskopalik  (posted 2019-09-18 06:30:28.0)
Thank you for contacting Thorlabs. Unfortunately, we cannot offer higher specifications on Surface Roughness and Surface Quality at this time, but it is certainly possible to apply black coating on the inner tubes as a custom option. We will contact you directly in this matter.
mikael.malmstrom  (posted 2019-01-15 06:56:43.54)
I would like to have a 2" reflective (high NA) collimator fibrecoupled for collecting scattered light, with a center hole for illumination also with a fiber coupled reflective collimator (Low NA). Would anyone else like such a thing?
nbayconich  (posted 2019-01-21 09:10:31.0)
At the moment we cannot provide 2" diameter reflective collimator packages however we can provide customized OAP mirrors to be used for similar applications. The simplest solution would be to use a stock OAP mirror from our catalog along with some of our catalog mirror mounts and terminated fiber adapters located in the links below. OAP mirrors with through holes https://www.thorlabs.us/newgrouppage9.cfm?objectgroup_id=7197 Right angle OAP mounts https://www.thorlabs.us/newgrouppage9.cfm?objectgroup_ID=11097 Termintated fiber adapters https://www.thorlabs.us/newgrouppage9.cfm?objectgroup_id=69
CMac  (posted 2018-12-19 10:42:19.247)
In the collimation tutorial, the quoted beam diameters are measured to 1/e2, is that correct?
YLohia  (posted 2018-12-21 10:00:09.0)
Hello, the listed values in the 'Collimation Tutorial' tab are calculated from the equation d = 2 x NA x RFL, so the diameter's definition will depend on the definition of NA for the fiber being used. The NA is based off a geometrical angle, and is for the 5% fall-off point from the peak intensity at the center of the beam.
kwu  (posted 2018-11-12 20:37:20.347)
I have a single mode 0.22 NA SMA fiber. and I want to let the output beam size as small as possible. Should I select RC02SMA-P01? Or RC12SMA-P01(for NA purpose)? Thank you.
YLohia  (posted 2018-11-13 09:25:02.0)
Hello, thank you for contacting Thorlabs. In this case, the RC02SMA-P01 would be most suitable for a small beam diameter as it has a higher NA than your fiber and a shorter focal length than the other collimators in this product line.
kullock  (posted 2018-09-26 09:53:10.657)
We would like to use one of the reflective collimators (probably RC08FC-P01) to couple out light from a photonic crystal (PC) fiber. The issue with PC fibers is that as the last hundred of micrometers are sealed (to prevent water from penetrating the holes) the light already starts to diverge there and, hence, the effective focus is not at the end facet but shifted into the fiber. So, the collimators cannot deliver collimated light for PC fibers (we tested it with the RC02SMA-P01 & RC04SMA-P01 variants). Would it be possible to have an adjustable fiber position to compensate for that? (This sounds at least tricky as the precisions probably has to be much below 10µm.)
nbayconich  (posted 2018-10-01 09:06:28.0)
Thank you for contacting Thorlabs. We do not have plans to release an adjustable focus version of the reflective collimator packages at the moment, we can however provide a version of these collimators where the fiber connector bulkhead will not be fixed/glued to the collimator housing allowing the position to be adjusted. I will reach out to you with more information.
user  (posted 2018-09-06 13:16:00.447)
What is the damage threshold of these products?
nbayconich  (posted 2018-09-06 03:25:55.0)
Thank you for contacting Thorlabs. We use the same metallic coatings for these reflective collimators as in the Off axis parabolic mirrors located in the link below. https://www.thorlabs.com/navigation.cfm?guide_id=2313 The same damage thresholds for these types of coatings on the OAP product page can be used for the reflective collimators, for example the LIDT for the -P01 silver coating will be 3 j/cm^2 @ (1064 nm, 10 ns, 10 Hz, Ø1.000 mm) for pulsed and 1750 W/cm @ (1.064 µm, Ø0.044 mm) & 1500 W/cm @ (10.6 µm, Ø0.339 mm) for CW. This is safe to use when collimating a fiber source. However your input power limitation when coupling into fiber using the reflective collimator will be limited by the epoxy of the fiber connectors. 300mW is our general rule of thumb for power coupling in to a connectorized fiber.
s.grandi  (posted 2018-08-02 18:27:07.667)
Hi, I am using a RC08APC to couple light from a coherent light source into a 1064nm PM fibre (also Thorlabs). However, I am struggling to get past 10% coupling. The mode of the incoming beam is nice and gaussian, and I can achieve up to 70% coupling with a lens. Do you have any advice on this issue? Thanks
YLohia  (posted 2018-08-09 03:19:52.0)
Hello, thank you for contacting Thorlabs. There are several factors that can impact the coupling efficiency. For example: - the input beam diameter and its wavelength - the collimation level of the input beam - connector type of the fiber being used. Is it FC/PC connectorized or is it FC/APC? - the type of mount being used. Based on our discussion, the KM100 you are using is not good enough for high efficiency single mode fiber coupling since it only offers tip and tilt adjustment. You will need z and y axis adjustment in addition to that. - it is also possible that the mirror is dirty and can require some cleaning
jyryu1  (posted 2018-02-26 23:11:27.737)
[Customer inspired version of RC02FC-P01) I am wondering if we could have SM2 compatible Reflective Collimators, Protected Silver Coating with final beam diameter of 20~25mm (which would fit into POLARIS-K2S2P).In case of laser we have, we have beam divergence of 220 mrad(PC type). it means 51 mm X 2 X NA ~ 11 mm will be the final beam diameter. Will it be possible? how long will it take? Sincerely Ji young, RYu
llamb  (posted 2018-03-13 09:02:08.0)
Hello, thank you for contacting Thorlabs. We should be able to offer a custom collimator, though it will likely have a long lead time that depends on the desired quantity and exact specifications. I will reach out to you directly to discuss this further.
niccolo.daddi.ext  (posted 2017-10-24 15:45:30.69)
I have the following fiber: FC fiber I/F, 600um core, 0.22 NA I need first to collimate it and then, in a second stage of my setup, to take the collimated beam and focalize it into another optic fiber. Could you please help me in the selection of the right collimator? Thank you.
nbayconich  (posted 2017-11-20 11:18:01.0)
Thank you for contacting Thorlabs. When using a multimode source we recommend using a collimator with the longest focal length as possible for your application to reduce divergence. Assuming you are coupling back into another fiber with a 600µm core diameter you should use two of the same type collimator with equal focal lengths for collimating and coupling. I will contact you directly to help you find the best solution for your application.
lebouquj  (posted 2017-10-03 14:45:17.477)
After building reflective collimators for years, we are very pleased to see this product!! Is there any plan for even larger beams (say diameter 20mm) ? Thanks
nbayconich  (posted 2017-10-05 09:55:59.0)
Thank you for contacting Thorlabs. We have provided reflective collimators with EFL's up to 101.6mm and can provide custom reflective collimators upon request. We have recently seen demand for longer focal length collimators so there may be a possibility of releasing stock versions in the future. I will contact you directly with more information.
kjm2  (posted 2017-08-31 18:43:43.617)
Hi there, I am currently using the RC02APC-P01 to collimate a 3 mm diameter laser beam into your SM fibre P3-23Z-FC-2 with NA 0.19 and a 9 um core. I am also using them to collimate the light from the fibre and send it to a detector. We will be ordering some fibres from another manufacturer with NA 0.23 and a 6.5 um core. Should I be using a reflective collimator with a better matched NA such as the RC04 or even RC12?
tfrisch  (posted 2017-09-14 04:55:07.0)
Hello, thank you for contacting Thorlabs. Typically, a collimating optic is selected to achieve a given collimated beam diameter. Beam diameter is roughly 2*NA*RFL for a reflective collimator. I will reach out to you directly about your application.
nisanns  (posted 2017-04-24 15:15:43.593)
when using the RC04SMA-P01 to collimate the output of a MM fiber, the collimated beam diameter in the provided table is listed as being from a 0.13 NA fiber. how does that scale if using a 0.39 NA fiber? is it linear with NA (maybe 2*effective focal length*fiber NA)? can you provide the method used to calculate the beam diameter? thanks much
tfrisch  (posted 2017-05-02 11:14:44.0)
Hello, thank you for contacting Thorlabs. The relationship is trigonometric, but that is often approximated as linear for small angles. the NA defines the divergence angle; NA=n*sin(theta) where n=1 for air. Theta is the half angle of divergence, RFL is the adjacent side, and you can solve for the opposite side length of a right triangle which is half of the beam diameter. I will reach out to you directly to discuss further.
christoph.kratz  (posted 2017-03-07 01:49:03.59)
I would like to couple a MIR source (5-10µm) into a fiber. Therefore I am interested in what kind of coating is used for silver protection? Is there an uncoated alternative like alluminium or gold for the surface of the mirror?
tfrisch  (posted 2017-03-23 01:17:30.0)
Hello, thank you for contacting Thorlabs. The protective coating is SiO2, but we can likely offer a version with unprotected gold for your application. I will reach out to you directly about details for a quote.
dirk.lorenser  (posted 2016-03-21 20:16:33.827)
I can see from your feedback comments that you align these collimators using a shearing interferometer at 540nm wavelength. Can you give me a spec for the wavefront error (deviation from a plane wavefront) which you achieve using this technique (e.g. lambda/10 over the specified output beam diameter) ? The reason I'm asking is because I'd like to use the RC12APC-P01 as a "plane wave" reference for a test setup. Thanks.
besembeson  (posted 2016-03-25 08:40:04.0)
Response from Bweh at Thorlabs USA: I will contact you with this specification.
johannes.walter  (posted 2015-08-27 17:02:43.95)
Thank you very much for your reply. Unfortunately, I did not receive any email so far. Might it got lost?
besembeson  (posted 2015-08-28 08:42:31.0)
Response from Bweh at Thorlabs USA: Our Germany team fielded this request and has obtained the data. I will provide it to you via email.
johannes.walter  (posted 2015-07-21 19:13:00.247)
Could you offer the RC02SMA with the UV enhanced protected aluminum?
besembeson  (posted 2015-08-19 03:05:06.0)
Response from Bweh at Thorlabs USA: We can provide this to you. I will followup by email.
david.panak  (posted 2015-02-18 12:34:00.52)
which version of the collimator (SMA, APC, or FC)has a mechanical stop for the end of the fiber ferrule? I do not want the focal lenght of the collimator to change based upon how much the fiber ferrule was polished. thank you
cdaly  (posted 2015-02-24 04:29:20.0)
Response from Chris at Thorlabs: FC/PC and FC/APC fibers have spring loaded ferrules which will push against a hard stop in the bulkhead of the compatible collimators. SMA fiber connectors do not feature this. The ferrule will go in as far as it will based on where the fiber is when it is tightened down. That's not to say that the SMA connector would not still be held to a tight tolerance on the location of it's end face though.
czl0579  (posted 2014-12-05 16:14:07.957)
We find the surface roughness is <10nm. This should be very smooth. But when we unplug the SM fiber a little bit (therefore the output beam is divergent) and put a white board infront of the collimator, we can see the beam profile is not uniform. There seems some scratchs. Dose it make sense?
jlow  (posted 2015-01-12 04:23:37.0)
Response from Jeremy at Thorlabs: We have contacted you directly to discuss about the measurement of the surface roughness.
clarafly  (posted 2014-09-15 01:56:44.963)
I want to collimate a 1550-nm light from a SMF28 fiber, reflect the light with a mirror, and then couple it back to the same fiber. The mirror can be placed very close to the collimator. What's the expected coupling efficiency if I use these reflective collimators? Is it possible to reach 80%?
johannes.walter  (posted 2014-08-22 15:02:59.38)
Hello, I would like to ask you how you assure the correct distance between the fiber core and the mirror. To my experience, the ferrule length of the fiber can vary depending on the fiber and manufacturer. Thank you!
jlow  (posted 2014-08-28 03:14:19.0)
Response from Jeremy at Thorlabs: For alignment, a shearing interferometer is used to ensure collimation. We use the S460-HP fiber at 543nm during production.
chmpengb  (posted 2014-07-16 14:44:01.293)
I don't see this RC0x series collimating lens having any features that allows us to fine tune the focal length from the input fiber, thus my feeling that the output quality - though the beam will be more converg, will not be so parallel /collimated, Is my opinion right? I indeed concern whether it is able to achieve a real collimated beam. Please tell me. thanks
jlow  (posted 2014-08-07 02:06:42.0)
Response from Jeremy at Thorlabs: The focal length of the mirror is constant across the wavelength range so you do not need to fine tune this for different wavelength. The correct distance between the bulkhead and the mirror is set during production so that one would get a collimated output beam from a fiber.
tbd8  (posted 2014-07-01 16:12:04.577)
Hello, do you have zemax models of these collimators?
myanakas  (posted 2014-07-08 10:53:41.0)
Response from Mike at Thorlabs: Thank you for your feedback. I have contacted you to provide you with the Zemax files for these collimators. Based on this feedback, we are working to have this information available on the website shortly.
sivelinu  (posted 2014-06-28 13:58:04.19)
Could I receiving collimated beam with different collimator?(from RC02FC-P01 to TC12FC780)
jlow  (posted 2014-08-07 08:40:54.0)
Response from Jeremy at Thorlabs: The reflective collimator is generally used with MM fiber whereas the triplet collimator is generally used with SM fiber. If you are collimating the output from a MM fiber and coupling that into SM fiber, this would not work well. I will contact you directly to discuss more about what your application.
sivelinu  (posted 2014-06-18 11:50:11.96)
Hi. Could you tell me which collimator is suitable for me? I'm planning to have an experiment. - Collimated beam is launched from collimator and is reflected by mirror and come into collimator again.
besembeson  (posted 2014-06-19 10:56:28.0)
Response from Bweh at Thorlabs - USA: Thanks for contacting Thorlabs. Yes that can be used for such an application. To optimize coupling back to fiber, you will need kinematic adjustment either on the collimator or reflecting mirror or both. For the RC04FC-P01, the KM05 (http://www.thorlabs.hk/thorproduct.cfm?partnumber=KM05) can be considered. We also have fixed aspheric lens collimation packages that you may consider for your application: http://www.thorlabs.hk/navigation.cfm?guide_id=2235
joachim.fischer  (posted 2014-05-09 09:09:28.437)
Hi. Can you give some information on the beam profile one can expect from your reflectors when using a SM fiber in the visible? Some graphs, or M^2 values? Thanks in advance.
jlow  (posted 2014-05-12 01:33:05.0)
Response from Jeremy at Thorlabs: We will measure the beam profile from a SM fiber and send it to you directly.
codrut.raduta  (posted 2014-02-23 01:34:13.653)
Hello, I am trying to couple a 120 W, 1940 nm laser, 5.5 - 6 mm beam diameter into a SMA connector fiber (NA = 0.22, fiber diameter 200-800 microns). May a reflective collimator be used on reverse, from a given laser beam into fiber? Will RC08SMA-01 work on that? Do you have any other suggestions? Like a custom made coupler with clear aperture big enough to accomodate our laser beam diameter? Thank you. Cody
besembeson  (posted 2014-02-28 04:59:22.0)
Response from Bweh E at Thorlabs: Yes the RC08SMA-P01 can be used for your application. You may also consider our large beam diameter air-spaced doublet collimators, such as the F810SMA-2000. The stock model is aligned for 2um but we can provide a custom version aligned for 1940nm.
czl0579  (posted 2014-01-03 18:57:00.317)
Hi, I want to couple a collimated white light source (600-800 nm) into a fiber. Which collimator will have a better efficiency, the reflective collimators, triplet fiber optic collimators or achromatic fiberports? Thanks a lot!
jlow  (posted 2014-01-20 04:01:34.0)
Response from Jeremy at Thorlabs: The choice of the collimator depends on a few things, especially the fiber and the light source used. The reflective collimator offers truly achromatic performance and also a large aperture over the achromatic FiberPort and the triplet collimator. The achromatic FiberPort has X, Y, Z, tip, and tilt adjustment in a very compact package. However, you could also put the reflective collimator on a kinematic mounts for further alignment. I will contact you directly to discuss about your application in more detail.
grakes  (posted 2013-08-13 16:11:24.943)
Could you offer the RC02 with the UV enhanced protected aluminum?
jlow  (posted 2013-08-15 16:15:00.0)
Response from Jeremy at Thorlabs: We could possibly offer this. We will contact with you directly for the quote.
user  (posted 2013-07-19 17:55:11.403)
Hi, I have a 1000 µm core diameter fiber with 0.22 NA. Will the RC12 work properly with such large fiber core? Thanks and regard. Frederic
cdaly  (posted 2013-07-24 13:44:00.0)
Response from Chris at Thorlabs: Thank you for using our feedback tool. The reflective collimators will still work well, but not quite as well as with a single mode (~5-10 um core) 0.12 NA fiber. The beam size and divergence will be larger than what it specified for these fibers. Longer focal length collimators may be susceptible to come attenuation if the NA of the fiber is too large and the beam is clipped on the parabolic mirror inside.
johannes.walter  (posted 2013-07-03 17:05:54.04)
I have the same question the user "pain" had almost 2 years ago: Would it be possible to offer collimators using a mirror with a smaller focal length to obtain a 2 mm beam diameter? My setup: SMA-905 fiber connector, 200 µm core, NA=0.22, necessary wavelength range: 200 - 1200 nm
cdaly  (posted 2013-07-03 11:10:00.0)
Response from Chris at Thorlabs: Thank you for your feedback. We do have an RC02 reflective collimator in the design stage at the moment which will create about a 2mm beam diameter. Unfortunately there is no set date for release at the moment yet.
schaefer  (posted 2013-06-12 15:57:29.273)
Below you give a formular for the divergence of the beam: divergence = arctan (Core Diameter in mm / EFL in mm) how precise is this and where can I find information about how to derive this equation? thanks a lot!
pbui  (posted 2013-06-13 16:42:00.0)
Response from Phong at Thorlabs: The divergence can be found by tracing a ray from the bottom edge of the fiber core through the top edge of the lens. Applying the thin lens approximation will yield the approximate equation. More sophisticated ray tracing techniques can solve for the divergence more accurately.
syim  (posted 2013-05-14 22:00:04.577)
I was very happy to see this product, since I had a hope to collimate UV beams easily. But when I tried it, I was disappointed. The output beam is not a smooth beam, but has complicated structures like many grains. It makes me embarrassed since I had not noticed any description about the beam quality.
jlow  (posted 2013-05-15 11:19:00.0)
Response from Jeremy at Thorlabs: I apologize for the issue you are having. I will get in contact with you to discuss more about your applications and troubleshoot this.
andrea.dellapatria  (posted 2013-03-13 07:38:08.757)
Could you please tell me if RC04SMA-P01 may work well with an SMA multimode fiber bundle (N.A.=0.22)? Thanks a lot Regards Andrea ___
tcohen  (posted 2013-03-21 15:01:00.0)
Response from Tim at Thorlabs to Andrea: The RC04SMA-P01 shouldn’t clip your beam with that NA fiber. However, the collimation performance will suffer as the core size gets larger. To be able to see if it’s suitable we would also need to know your core size and the maximum divergence angle that your application is able to accept. I will contact you to discuss this in the context of your setup.
jlow  (posted 2012-08-29 17:05:00.0)
Response from Jeremy at Thorlabs: Thank you very much for your feedback. The output beam diameter is dependent on both the focal length and the numerical aperture (NA) of your fiber. The beam diameter specified online is based on a 0.13NA fiber. I will get in contact with you to discuss about your application.
bmangum  (posted 2012-08-24 10:56:05.0)
I am very happy to discover that these collimators are being offered. I would like to use them for microscopy applications (I imagine many other customers also). Many Microscope objectives have a back aperture diameter in the range of ~5-5.5 mm. It would be fantastic if you were offering this product that could directly yield a beam with a 5.5 mm diameter as this would allow direct use of the beam without further conditioning as it is desirable to fill (or slightly overfill) the back aperture of the objective with a collimated laser beam. Might you consider offering these products with more beam diameters?
tcohen  (posted 2012-05-09 15:17:00.0)
Response from Tim at Thorlabs: Thank you for your feedback! I will open a discussion regarding your idea with our production team. About 1/3 of our products are customer inspired and we appreciate you sharing your product idea as we continue to expand our catalog.
lg  (posted 2012-05-07 20:26:36.0)
Thor labs should really offer their 2 inch and 1 inch off-axis parabolas in a similar setup as RC12SMA. There have been so many times in the last 6 years I have wanted a plug and play parabola for a large core fiber collimated output. Offering the mounts are well and good, but have a well machined and aligned part that just drops into the Thor Labs cage mount system would save a lot of time and hassle.
bdada  (posted 2011-10-06 17:08:00.0)
Response from Buki at Thorlabs: Thank you for your feedback. We will contact you directly to discuss your application.
pain  (posted 2011-10-06 10:50:33.0)
Would it be possible for Thorlabs to offer collimators using a mirror with a smaller focal length to obtain a 2mm beam diameter using the same fiber ?
jjurado  (posted 2011-06-16 15:22:00.0)
Response from Javier at Thorlabs to freedayback: Thank you for contacting us. The formula we provide for the output beam diameter is simply a rough approximation, which assumes the output of the fiber to be a point source and is helpful for getting an idea of the required focal length and clear aperture of the collimating lens. As the core of the fiber increases, this approximation becomes less accurate, since the core can no longer be considered a point source. This is also why we recommend limiting the numerical aperture when using multimode fibers. Nonetheless, there are more robust formulas available that you could use. I will contact you directly for further support.
freedayback  (posted 2011-06-16 08:01:05.0)
its said that "output diameter=2*NA(fiber)*EFL? would the fibers core diameter affect the output diameter?
bdada  (posted 2011-04-26 17:52:00.0)
Response from Buki at Thorlabs: Thank you for your feedback. I am sorry to hear you've had problems using our reflective collimator. We have contacted you to get more information about your fiber and laser source so we can give you a better estimate of the coupling efficiency.
mike.staniforth  (posted 2011-04-26 12:21:55.0)
Hi I purchased one of these collimators for use in the mid IR. Laser beam of 1/e2 of ~5mm I have struggle to acheive any decent collimation onto my fibre (for which a lens set acheived 4 to 5 times the power collected). Do you know what might be going wrong - can I return?
Greg  (posted 2011-01-13 10:54:22.0)
A response from Greg at Thorlabs:You can estimate divergence with the following formula: divergence = arctan (Core Diameter in mm / EFL in mm)
user  (posted 2011-01-12 21:31:30.0)
Is there a simple way to estimate beam divergence from a multimode fiber for these collimators?
tor  (posted 2010-12-07 14:11:33.0)
Response from Tor at Thorlabs to day: Thank you for your interest in our reflective collimators. We will be soon releasing the RC04-series, which will include a 0.36 NA and will be available with APC receptacles. Subscribing to our new product RSS feed will allow you to track the release of these collimators: http://www.thorlabs.com/feeds.cfm
day  (posted 2010-12-06 10:33:20.0)
Hi, did you create an FC/APC version in the end? I would also be interested in such a version. Also, is it possible to get this collimator with a higher NA (~0.25)?
klee  (posted 2009-11-24 16:36:50.0)
A response from Ken at Thorlabs to mdefensor: The RC08FC is for FC/PC only. However, we are preparing to launch a APC version and could possibly make a special in 3 -4 weeks time.
mdefensor  (posted 2009-11-20 23:57:20.0)
Hi I would like to ask if it is possible to use an FC/APC fiber connector for this collimator. We are planning to use it as a collector for a fiber coupled imaging spectrometer. We would like to use an APC connector on the collection side to minimize back reflections which causes unwanted interference patterns in our obtained spectra.

FC/PCコネクタ付き反射型コリメータ、保護膜付き銀コーティング

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Single ModePolarization MaintainingMultimode
FC/PC to FC/PC
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AR-Coated FC/PC to FC/PC or FC/APC
FC/PC to FC/PC
FC/PC to FC/APC
FC/PC to FC/PC
FC/PC to SMA
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RC08FC-P01 Support Documentation
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RC12FC-P01 Support Documentation
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FC/APCコネクタ付き反射型コリメータ、保護膜付き銀コーティング

Compatible Stock Patch Cables
Single ModePolarization Maintaining
FC/APC to FC/APC
FC/APC to FC/PC
AR-Coated FC/APC to FC/PC
FC/APC to FC/APC
FC/APC to FC/PC
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RC02APC-P01 Support Documentation
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RC04APC-P01 Support Documentation
RC04APC-P01Protected Silver Reflective Collimator, 450 nm - 20 µm, Ø4 mm Beam, FC/APC
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RC08APC-P01 Support Documentation
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RC12APC-P01 Support Documentation
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SMAコネクタ付き反射型コリメータ、保護膜付き銀コーティング

Compatible Stock Patch Cables
Single ModeMultimode
SMA to FC/PCSMA to SMA
High-Power SMA to SMA
SMA to FC/PC
+1 数量 資料 型番 - ユニバーサル規格 定価(税抜) 出荷予定日
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RC04SMA-P01 Support Documentation
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RC08SMA-P01 Support Documentation
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RC12SMA-P01 Support Documentation
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