シヤリング干渉計


  • Collimation Test Device
  • <10% Beam Pick-Off
  • Beam Diameter Range: 1 - 50 mm

SI254

SI035P

SI050 with SICP Cage System Adapter
Plate, 30 mm Cage Components,
and SM1 Lens Tube

Application Idea

Related Items


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集束光または拡散光
Converging Light Diverging Light
コリメート光
Collimated Light
Shearing Interferometer Drawing
Click for Details

ケージシステムアダプタ(別売り)を付けたシヤリング干渉計の断面図

特長

  • Ø1~Ø50 mm ビームのコリメートの度合いを定性的に判断
  • 磁石でつなげるキネマティック設計により、シヤリングプレートを素早く交換可能
  • ミリ規格およびインチ規格のネジ切り穴で取付け

当社のシヤリング干渉計は、コヒーレント光がコリメートされているかを判断するためにお使いいただけます。この干渉計は、45°に取り付けられたくさび形オプティカルフラット(シヤリングプレート)と、中心に基準線がある拡散プレートで構成されています。このような干渉計は光のコリメートの定性分析のために設計されたものです。

拡散板は、オプティカルフラットの前面および裏面からのフレネル反射が生成する干渉縞を見るために使われます。ビームがコリメートされている場合、縞パターンは基準線に対して平行になります。干渉縞は、コリメート角度以外にも、球面収差、コマや非点収差の影響を受けます。

くさび形オプティカルフラット(シヤリングプレート)は、透過帯域が185 nm~2.1 µmでコーティング無しの UV溶融石英から作られています。各プレートサイズのウェッジ角は、対応するビーム径に合わせて最適化されています。詳細は「仕様」タブをご参照ください。光はプレートに対して45°の角度で入射するので、干渉縞の強度は、光の偏光状態に依存します。偏光方向が入射面に対して垂直であるとき、最大強度が得られます。

干渉縞を観察するためには、入射光のコヒーレンス長がシヤリングプレートによる光路長の変動幅よりも長い必要があります。詳細は「仕様」タブの脚注をご参照ください。なお、ファブリペロー型レーザ、SLD、LEDなどの広帯域光源はコヒーレンス長が短いため、干渉縞が生じませんのでご注意ください。

Shearing Interferometer Cage
Click to Enlarge
シヤリング干渉計SI254の背面に固定された30 mmケージプレート

構造
シヤリング干渉計は、ベース、くさび形オプティカルフラット(シヤリングプレート)、および観測用スクリーン拡散プレートの3つの部品を1セットとして、 アルミニウムケースに収納されて納品されます。干渉計のセッティングの際は、付属の#4-40ネジと六角レンチを使用して観測用スクリーンプレートをベー スに取り付けてください。シヤリングプレートは、磁気で固定されるので、他のくさび形オプティカルフラット(シヤリングプレート)との交換が容易にできます。

ベースはアルマイト加工済みのアルミニウム製で、Ø12 mm~Ø12.7 mm(Ø1/2インチ)のポストに取り付けられるようにタップ穴があいています。SI500を除く全ての干渉計には背面に4つの#4-40タップ穴が付いており、当社の30 mmケージシステムに取付けることができます(左の写真参照)。このユニットを30 mmケージシステムに前から取り付ける場合については下のアクセサリのセクションをご参照ください。

くさび形オプティカルフラットの後ろにはベースを貫通する穴があいているので、伝播されたビームは妨げられることなくオプティカルフラットを通過します。 SI500を除くすべてのモデルにはこの穴にはSM1ネジ切り加工が施されています。右の断面図では、シヤリング干渉計の構造と光線の伝搬状態が図示されています。

アクセサリ
小さなビーム径では、対応する干渉縞も小さくなるため観測が困難になります。このような場合、標準の拡散プレート観察スクリーンの代わりに別売りの拡大観察スクリーンSIVS(下記)を使用することで、拡散プレートの干渉縞のサイズを拡大することがで きます。SIVSは、マウント済みの発散レンズと拡散プレートから構成されており、1 mm~10 mmのビーム径でご使用いただけます。SM1ネジ切り付きのマウントプレートSITSTは、SM1レンズチューブなど様々なアクセサリに固定することが出来ます。くさび形オプティカルフラット(シヤリングプレート)も単品の購入が可能で、同一のベースユニットを使いながら、様々な ビーム径に対応した構成が可能です。

当社では、30 mmケージシステムまたはSM1レンズチューブ をシヤリング干渉計の入力側に取り付けるための2種類のアダプタを別途ご用意しています。両アダプタとも、観察スクリーンが組み込まれており、SM1ネジ付き入力開口のまわりに30 mmケージシステムを取り付けられるよう#4-40タップ穴が付いています。 SICPには、当社の干渉計と同様の干渉縞観察用の拡散板が付属しています。また、SICPSM1には拡散板の場所にSM1ネジが付いており、レンズチューブなどのアクセサリを干渉縞を観察する干渉計の上部に取り付けることができます。

尚、大型のベースを使用しているSI500にはいずれのアクセサリも対応しておりませんのでご注意ください。

Item #Wedge
Angle
DiameterDiameter ToleranceThicknessThickness ToleranceApproximate
ΔOPLa
SI035P117 arcsec7.94 mm+0/-0.25 mm0.75 mm±0.25 mm2.50 mm
SI050P83 arcsec12.7 mm+0/-0.25 mm1.30 mm±0.25 mm4.33 mm
SI100P40 arcsec15.60 mm+0/-0.25 mm2.60 mmb±0.25 mm8.66 mm
SI254P18 arcsec38.00 mm+0/-0.25 mm6.35 mmb±0.25 mm21.16 mm
SI500P10 arcsec78.00 mm+0/-0.25 mm13.00 mmb±0.25 mm43.33 mm
  • 干渉縞が生成されるには、光源の有効コヒーレンス長が光学距離の差(ΔOPL)よりも長い必要があるので、ご確認ください。使用される光源のコヒーレンス長がΔOPLの数倍にもなるとき、干渉縞のコントラスト比は小さくなります。コヒーレンス長がΔOPLに近づけば、インコヒーレント光が効率よくイメージングされます。ここに記載されているΔOPLの数値は、UV溶融石英(n=1.457 @ 632.8 nm)を使用したときに、平行な反射面同士の間の距離が上記の厚さ寸法であると仮定して計算されています。
  • 光学素子の厚さが理由で、シヤリングプレートの背面は取付けプレートから突き出る形になります。そのため、ベースユニットにシヤリングプレートを取り付けたり外したりする際(特にケージアダプタープレートSICPまたはSICPSM1を取り付ける際)にはご注意ください。
Item #Included
Platea
Beam Diameter
for Included Plateb
Compatible PlatesCompatible
Accessories
Threaded
Mounting Holes
Dimensions
(L x W x H)
SI035SI035P1 - 3 mmSI035P, SI050P, SI100P, and SI254PSIVS, SITST, SICP, SICPSM18-32 and M450.8 mm x 48.3 mm x 55.9 mm
SI050SI050P2.5 - 5 mm
SI100SI100P5 - 10 mm
SI254SI254P10 - 25.4 mmSIVSc, SICP, SICPSM1
SI500SI500P25.4 - 50 mmSI500PNone Available1/4"-20 and M6116.8 mm x 133.4 mm x 134.6 mm
  • くさび形プレートの材質はUV溶融石英(UVFS)です。
  • 異なるビーム径に対応して、異なるウェッジ角を有する様々なプレートがあります。これは、特定のビーム径に合わせてプレート間の距離を最適化し、干渉縞を生成するためです。
  • SIVSは、小径ビームによってできる小さな干渉縞の観察用に設計されています。SI254にも対応していますが、SI254の使用を想定している大径ビームの干渉縞を見るための製品ではありません。

上図は光が面に対して直角に入射した場合のUVFSの透過率曲線です。このデータは、厚さ1 mm、コーティング無しのサンプルの場合で、表面反射を含んでいます。


Posted Comments:
Marshall Scott  (posted 2021-07-28 08:32:06.457)
This is one of my favorite tools. You should make a tutorial for how to use these things. https://www.reddit.com/r/Optics/comments/ot21oa/shear_interferometer_measurement_method_need_help/
YLohia  (posted 2021-07-29 02:10:49.0)
Hello, thank you for your feedback! We're happy to hear that these are one of your favorite photonics tools. We will consider offering an "Insight" on Shearing Interferometers in the future.
user  (posted 2021-07-07 17:14:16.64)
你好,我们很早就买了一套SI100,现在用来检测532nm的激光时,看不到条纹,请求帮助。
YLohia  (posted 2021-07-07 02:58:02.0)
Hello, an applications engineer from our team in China (techsupport-cn@thorlabs.com) will discuss this directly with you.
user  (posted 2021-04-27 09:34:08.863)
It would be super helpful if you added a resource tab to this product line with a series of images showing the effects of different aberrations on the observed interference fringes. Seeing how astigmatism, coma, spherical, or a few common combinations of aberrations in addition to simple de-focus would really enhance the usability for users and ability to troubleshoot problems in their system. Answering a few of the other questions users have already posted below would also be helpful, such as: a GIF showing how decreased coherence washes out the contrast of the fringes, also better explanations with a diagram or two of how the collimation may look slightly different between shear plates if your beam is a cutoff diameter that could be used with 2 different plates (10mm diameter for example) and how choosing the right size actually impacts your measurement. I always appreciate your excellent resources and think this could be a great addition. Thank you for your consideration!
tcampbell  (posted 2021-04-27 05:01:32.0)
Hello, thank you for contacting Thorlabs. We greatly appreciate your suggestion to add this resource to our presentation. We will look into creating a tutorial for these interferometers shortly.
Melissa G  (posted 2021-04-26 00:59:34.317)
Thank you for the helpful product! I have many questions, but I am grateful for answers to any of them! If I am able to expand my beam to an arbitrary size by different FL lenses, is there one I should prefer for the most sensitive characterization of collimation? Does the use of an iris in a large beam affect performance of the shearing interferometer? I often get a cleaner image if I over-fill the aperture, does that make sense to you? Do dirty plates affect the shape of the interferogram; if so, how do you suggest I clean them? I can find more information on non-wedge shearing interferometers; are there any educational/instructional sources you recommend? Thank you for your time and for any help you are able to provide.
YLohia  (posted 2021-05-06 03:35:53.0)
Since this is a qualitative way of evaluating the collimation level by observing fringes, the "most sensitive characterization" will be what the user can see the easiest-- so using the largest beam size possible. Please note that the larger SI's have thicker optics, so the coherence length of your source should also be longer. Yes, dirty plates can certainly affect the quality of the interferogram-- we suggest cleaning them with isopropyl alcohol (https://www.thorlabs.com/newgrouppage9.cfm?objectgroup_id=9025).
user  (posted 2021-04-20 13:58:01.87)
Is it possible to buy a kit that contains the holder, the diffuse screen, and all 5 shear plates?
YLohia  (posted 2021-04-21 02:29:11.0)
Thank you for contacting Thorlabs. Unfortunately, such a kit is not available for sale. At the moment, you would have to procure all the components separately. We will consider adding such a kit to the catalog in the future.
跃 王  (posted 2020-12-28 21:07:12.537)
您好, 我最近购买了这款干涉仪器去调节光束准直(diameter=30mm);但是发现干涉条纹并不是完全平行,中间的条纹较为扭曲;不知道是什么原因?希望你们可以提供一些帮助; 感谢! 王跃
YLohia  (posted 2020-12-29 10:46:46.0)
Hello, thank you for contacting Thorlabs. An applications engineer from our team in China (techsupport-cn@thorlabs.com) will reach out to you directly to discuss this.
user  (posted 2020-07-21 01:34:28.26)
Hi there, any concern while using the shear plate? I'm working on a 532nm beam. I can see the beam is diverging while hitting on the wall while the shear interferometer tell me it is collimated.
Yang Xu  (posted 2020-07-21 00:45:18.123)
Hi Thorlabs, I'm using your shear interferometer as a reference to collimate my laser beam and I found several questions/problems listed below: 1. While I'm trying to collimate my beam (diameter~25mm), I found that the collimating point(parallel line) telling by SI254 is quite different from that telling by SI100. I'm wondering why that would happen? Which one I should rely on? 2. In some cases, interference patterns shown on the viewing window are blended (not straight). Is it possible that Thorlabs can provide a detailed instruction on how to use the Shear interferometer and what different pattern means? Many thanks!
asundararaj  (posted 2020-08-10 09:44:11.0)
Thank you for contacting Thorlabs. Differences in the patterns can be attributed to coherence length of laser, thickness of shear plate, and more importantly wedge angle. The choice of the shear plate should be based on the beam size; for a 25 mm beam, the SI254 should be used. The fringe quality observed on the shearing interferometer depends on the beam quality which corresponds to the choice of lens used to collimate your beam. I have reached out to you to discuss this further.
Christian Schmidt  (posted 2020-06-17 11:35:15.09)
Hello. Is it possible to geht the interference plates, without the glas or with unwedged glasses?
nbayconich  (posted 2020-06-17 02:00:18.0)
Thank you for contacting Thorlabs, we can provide the shear plates or diffuser plates without optics. I will reach out to you directly with more information.
Christian Oggenfuss  (posted 2020-05-04 14:48:49.46)
Is it possible to measure the incident angle of the beam with this interferometer? Will the distance between the fringes change?
asundararaj  (posted 2020-05-21 11:52:37.0)
Thank you for contacting Thorlabs. It would not be possible to measure the incident angle of a beam with a shearing interferometers. The shearing interferometers offer a qualitative test for the collimation of the beam. The AOI of a beam can be determined/tracked by reflecting a beam and observing beam translations on a position sensing detector.I will reach out to you directly about your application.
Simon BECKER  (posted 2020-02-12 10:48:36.683)
Hello, I'im using the shear interferometer for set the good colimation of my laser in ordrer to make digital Holography. Previously I'have use an MCLS1-520 diode in a 4-channel fiber-coupled laser and I was able to see the fringe. Everything was allright. Since I use a 660nm single mode laser LP660-SF50 coupled with a PAF2-A4B fiber collimator, I'm not able to see the fringe. Because the fiber is 5µm diameter core single mode, I assume that the wave is spatialy filtered. Can you help me to understand why the interferometer doesn't work with my 660nm laser and if I have a way to make it work. Thank you Best regards
YLohia  (posted 2020-02-17 11:49:28.0)
Hello Simon, thank you for contacting Thorlabs. The reason you are not seeing interference fringes on your shearing interferometer is due to the short coherence length of the LP660-SF50, which is a Fabry-Perot diode with multiple longitudinal modes. The coherence length of this particular diode is on the order of <1 mm (depends on temperature and current setpoint). The thinnest shear plate we offer has an approximate optical path length of around 2.5 mm @ 632 nm. Therefore, the beam from this diode will no longer be coherent over a full round-trip within the shear plate. We confirmed this with an in-house test with this diode and also confirmed functional performance of the shearing interferometer using a long coherence length source (HeNe laser). You should be able to see interference fringes with a single frequency laser such as the L670VH1.
SB Wu  (posted 2019-11-05 03:27:35.187)
To Whom It May Concern, Are Shearing Interferometers also fit for noncoherent light, say, LED, Xe lamp, etc?
nbayconich  (posted 2019-11-05 12:54:43.0)
Thank you for contacting Thorlabs. The shearing inteferometers would not be suitable for an incoherent light source such as and LED or Xenon Lamp. In order to create interference fringes a source with a coherence length longer than the change in optical path length must be used with these shearing interferometers.
melch0r  (posted 2019-01-22 08:48:31.3)
Hello, i am wirting my bachleor thesis about the digital optical twin and how it could be measured or monitored. I cant find any specs regarding accuracy or time to measure. Can you help me out? thanks
YLohia  (posted 2019-01-24 10:26:45.0)
Hello, thank you for contacting Thorlabs. I have reach out to you to gather more information about your application.
e.lopez  (posted 2018-09-07 12:27:17.58)
Hello, we have a 785nm and a 1064nm CW laser. If we buy the shearing interferometer, do we need extra items to see the fringes? Thank you in advance. Eneko
nbayconich  (posted 2018-09-07 02:14:47.0)
Thank you for contacting Thorlabs. For your 1064nm source you will need to have an IR camera in order to see the fringes created by the shearing interferometer. For your 785nm you may not need an IR camera as this can be faintly visible but will be dependent on the intensity of the 785nm source and the individual observing the interference pattern.
laric.bobzien  (posted 2018-03-15 10:20:18.757)
I need the holder, without the shear plate. (I already have multiple shear plates, but only one holder.) Would you sell one separately? If so, at what cost?
nbayconich  (posted 2018-03-15 02:37:22.0)
Thank you for contacting Thorlabs. Yes we can provide the shear plate holders separately. I will reach out to you directly with a quote.
gspaldin  (posted 2017-10-16 14:17:23.69)
I need the holder, without the shear plate. (I already have multiple shear plates, but only one holder.) Would you sell one separately? If so, at what cost? (This is for teaching purposes.)
nbayconich  (posted 2017-10-18 03:40:44.0)
Thank you for contacting Thorlabs. We can provide the holder for you. I will contact you directly for a quote.
yev  (posted 2017-04-28 05:21:59.88)
Dear Sirs! We need to collimate laser channel of rangefinder 905nM high power pulse laser diode as source. Please how we can see the fringes on the screen?
tfrisch  (posted 2017-05-02 12:21:40.0)
Hello, thank you for contacting Thorlabs. In the past, customers have used IR cameras to view the diffuse plate. I will reach out to you directly about your application.
user  (posted 2016-11-28 15:25:18.67)
The kinematics are not very good. This device needs stronger magnets.
tfrisch  (posted 2016-11-29 01:30:32.0)
Hello, thank you for contacting Thorlabs. I'm sorry you are having trouble with this product. If you reach out to us at TechSupport@Thorlabs.com, we can discuss how it is mounted and possible solutions. I look forward to hearing from you.
parksj003  (posted 2016-11-18 08:15:31.183)
Hello, Shearing interferometer can work for the femtosecond laser (700-1000 nm)? If so, IR camera with some focusing elemets are only option to see the fringes? Best, Seongjun
tfrisch  (posted 2016-11-28 04:01:29.0)
Hello, Thank you for contacting Thorlabs. I have several concerns that are application specific. I will reach out to you directly.
luoyukun4580  (posted 2016-11-09 17:24:06.33)
Dear sir or madam, I am using the SI254P to check the collimation of our laser beam with a diameter about 20mm at 780nm. Although we adjust the collimator to achieve a desired fringe that indicates a collimated light, we can see an obvious foucs of our laser beam. And if we adjust the laser to be roughly collimated through naked eye, the fringe is just not parallel to the reference line? Should there be some proper expalnations to the phenomenon and which collimation criterion should we refer to?
tfrisch  (posted 2016-11-14 08:34:46.0)
Hello, thank you for contacting Thorlabs. I have reached out to you directly about your application.
tzu-lun.wang  (posted 2016-03-09 09:49:09.057)
Dear Sir or Madam, I am using Throlab's sheer plate to test our Ti:Sapphire pulse laser. My problem is we can't see any fringes now. We were able to see the fringe patterns, but the contrast is very low, and sometimes it even disappeared. But last week the specialist from the laser company (Spectra Physics, Tsunami) come here to optimize our laser, and after that we cannot see fringes anymore, and I always measured the laser under continues wave mode. What the specialist did is just simply align the laser by adjusting and cleaning the mirror inside the laser cavity. Because our light source is a laser with continues wave, so the coherent length should not be a problem So here I would like to ask that do you have idea about the low contrast of fringe patterns, and also why the fringe patterns are not able to be detected after we optimizing the laser? Thank you very much!
besembeson  (posted 2016-03-10 03:02:06.0)
Response from Bweh at Thorlabs USA: This should be related to the coherence length of your laser compared to the change in optical path length. The fringe contrast decreases as your coherence length approaches a few multiples of the change in OPL. We will contact you to look into your laser properties further.
achmyro  (posted 2015-10-30 19:09:00.587)
Is it possible to use SICPSM1 in combination with VRC2SM1 for checking collimation of IR beams? Is VRC2SM1 transparent enough to see the interference fringes? I guess you can check this easily in your lab.
besembeson  (posted 2015-11-04 05:44:18.0)
Response from Bweh at Thorlabs USA: The VRC2SM1 will not work since it is not transparent. It is made from a durable plastic and has a photosensitive region adhered to the front surface. The VRC5 can be transparent as it has clear plastic on both sides of the photosensitive material. When the VRC5 is used in a darkened room with a sufficiently high power IR source, the fluorescence from the activated photosensitive region can be seen through the back of the card but the fringe contrast to determine collimation will be too poor to be usable. If you have an IR viewing camera, you may consider that.
daniel.najer  (posted 2015-09-14 13:14:38.763)
Dear Sir or Madam, would it be possible to use an SI035 Shearing Interferometer at a wavelength of 950 nm? What about observing the interference pattern with an infrared viewer? Or are there any other options, such as a fluorescent diffuser plate? Best regards!
jlow  (posted 2015-09-23 09:38:59.0)
Response from Jeremy at Thorlabs: The shearing interferometer can be used at 950nm but you do need a way to see the inteference fringes such as an IR viewer. We do not currently offer the fluorescent plates but this is something that we are looking into.
dverhaart  (posted 2014-08-20 10:31:12.883)
We use the device routinely to collimate ~ 7 mm (1/e2) diameter 355 nm laser beams. We normally use SI100, but have also used SI030, SI050 and SI254. When comparing various devices (many SI100 and one each of the other ones) om a beam perfectly collimated with one device, we find the tilt angle of the pattern to vary in a +/-5 degree range, with an outlyer of almost 20 degree for the SI254. This means that collimation state of the beam will depend on the device used. What is Thorlabs spec for orientation accuracy of the wedge? For the instrument to be accurate it should be better than 1 degree!
besembeson  (posted 2014-10-10 09:33:19.0)
Response from Bweh at Thorlabs: Such a large variation is not an expected observation for these units. When we produce these parts we use a very well collimated visible source, a dedicated jig with the Zygo GPI to align the plates and in this setup, we don't have an orientation accuracy specification. The SI254 should be returned to us to test if we can reproduce this result since we don't expect this to be off by 20°. We can also check any of the other units that you would like to be returned.
sh.han  (posted 2014-01-27 10:03:59.243)
Dear Sir or Madame, can I use SI100 at 1550nm? If it is possible, please let me know other requirements. For example, do I need IR camera or something? Thank you in advance.
sgebhart  (posted 2014-01-23 11:25:13.353)
I am trying to use the S100 to test collimation for a superluminescent diode centered at 830nm with a FWHM bandwidth of 18nm, roughly Gaussian spectrum, and 6mm beam diameter. Thus far, I have been unable to see any fringes, with our without the SIVS, with my NIR camera. I can see the overlapping spots, but there is no fringe pattern present within the overlapping region. Please let me know if you have any suggestions. Thanks!
besembeson  (posted 2014-01-29 11:23:36.0)
Response from Bweh E. at Thorlabs: Thanks for choosing Thorlabs. The reason you unable to see any fringes is because of your source. Superluminescent sources have high spatial coherence but their temporal coherence is very low. This means that they also have very short coherence lengths (typically well under 0.1mm). The contrast of the interference fringes decreases as the coherence length of the source approaches a few multiples of the optical path length change (?OPL) in the shearing interferometer . The SI100 has an ?OPL of 6.62mm (for 632.8nm laser or slightly less at 1550nm) meaning that any source with a coherence length less than this value will not produce interference fringes.
muellenbroich  (posted 2013-11-07 16:24:06.537)
One of the little metal balls that fixes the shear plate to the viewing cube has fallen off and disappeared forever more into the optical table. Is it possible to get a replacement? Thanks!
tcohen  (posted 2013-11-07 03:48:15.0)
Response from Tim at Thorlabs: Thanks for bringing this to our attention. We’ll contact you with a replacement and check assembly (they should be permanently epoxied and difficult to displace).
muellenbroich  (posted 2013-10-17 12:32:53.333)
We just bought the SI035 but I cannot see any fringes. The laserbeam is about 1mm diameter, 445nm, p-polarised (Cobolt MLD™ diode laser) in combination with a ND filter (no3)because I tought eye saturation might be an issue. Can you help to troubleshoot? Would the magnifying accessory definitively help to see the fringes (if there are any)? Cheers!
jlow  (posted 2013-10-17 08:58:00.0)
Response from Jeremy at Thorlabs: The effective coherence length of the laser should be much larger than the optical path length difference (around 1.91mm for SI035) to get good fringe contrast. It can also be hard to see the fringes with a Ø1mm beam. We will get in contact with you directly to troubleshoot this.
avle  (posted 2013-10-14 01:54:25.803)
any suggestions for using the shearing interferometer for beam diameters less than 1mm? would using a beam expander before the shearing interferometer work? We regularly have beam diameters that are all centered around .5mm. thanks!
cdaly  (posted 2013-10-17 16:15:00.0)
Response from Chris at Thorlabs: Thank you for using our feedback tool. The beam expander would be the way to improve the visibility. But you'll want to make sure that the beam expander is already well adjusted for your focal length so that the output beam is not giving you any false information about the collimation of the input beam.
joseph.lawson  (posted 2013-07-15 18:22:25.623)
Is it possible to get a replacement diffuser plate?
tcohen  (posted 2013-07-16 20:04:00.0)
Response from Tim at Thorlabs: Yes, we can supply this. We will contact you with a quote.
tcohen  (posted 2013-01-02 09:47:00.0)
Response from Tim at Thorlabs: Thank you for your request. We may be able to offer a modified SI035 with SIVS to suit your needs. There are manufacturing limits on the shear plate that will restrict the diameter from much smaller than 1mm. As you have not provided an email for us to contact you directly, please contact us at techsupport@thorlabs.com to discuss possible solutions for your beam diameter.
user  (posted 2012-12-19 07:26:57.45)
Are there plans to offer plates for beam diameters < 1 mm?
rscholl  (posted 2012-12-05 11:52:00.0)
A response from Ryan at Thorlabs: Thank you for contacting us. It sounds like the issue is regarding the contrast of the stripes or interference fringes. This suggests the coherence length is less than several times the optical path length difference of the interfered beams. We will contact you directly for more information.
martin.vogel  (posted 2012-11-23 14:35:06.927)
Hi, I have a strange observation using the SI100: With a blue laser @ 488nm, I see a nice patterns of stripes. With a yellow laser @ 580nm, I also see a stripe pattern, but it is overlaid with a bright spot of light. Any idea what could be the cause for this? Many thanks, Martin
tcohen  (posted 2012-09-13 13:09:00.0)
Response from Tim at Thorlabs: When using the SI100, we would expect to see about ~2.8mm at your wavelength. You will notice the wedge angle increases for smaller beam diameters to reduce the fringe spacing and be discernible in the visible wavelengths. As the fringe spacing is directly proportional to wavelength, it will be larger for 1.55um. Currently, we are working on NIR shearing interferometers to be able to be detected with the same convenience as our visible versions.
ron.stahl  (posted 2012-09-07 14:29:54.0)
What fringe spacing can I expect from a 1.55micron wavelength beam with the SI100? I found a formula that suggests that it would only be a few microns and I'm concerned that I won't be able to see this with my InGaAs camera.
jjurado  (posted 2011-08-17 13:51:00.0)
Response from Javier at Thorlabs to david.milne: The reason why different plates are offered for different ranges of beam diameters is that, in order to observe the interference pattern of a particular beam generated by the front and back surfaces of the shear plate, the wedge angle of the optic needs to be carefully chosen. Launching a large beam onto a small diameter shear plate (and vice versa) will cause the front and back surface beams to be misaligned, preventing the formation of the interference pattern. I will contact you directly for further support.
david.milne  (posted 2011-08-17 15:19:02.0)
Can you explain why you need different shear plates for different beam diameters? For instance if I use a large beam with the small diameter shear plate, will I still see fringes? If I use a small beam with a large diameter shear plate, will I still see fringes?
jjurado  (posted 2011-08-02 13:47:00.0)
Response from Javier at Thorlabs to dcasale: In order to view the fringe pattern generated by the interferometer at 1064nm, it would be necessary to place a translucent fluorescing material on top of (or in place of) the diffuser plate, or to use an IR viewer or camera. We currently do not carry these product, but I will contact you directly with some suggestions.
dcasale  (posted 2011-08-01 14:17:19.0)
What is recommended when viewing 1064nm lasers? Should the top plat be replaced with a fluorescing material, or can it be laid directly on top/below?
jjurado  (posted 2011-05-04 15:00:00.0)
Response from Javier at Thorlabs to Eric Le Moal: Thank you very much for contacting us. I will contact you directly to help you troubleshoot your application.
eric.le-moal  (posted 2011-05-04 09:09:45.0)
Dear Sir/Madam, the shearing interferometer shows no fringe contrast with our laser source that emits 6 ps pulses at 1064 nm (I use a IR camera to look at the shear plate). As 6 ps pulses are relatively short (1.8 mm in vacuum), I wonder if this is a time coherence issue. Could you please tell me what is the thickness of the shear plate itself? (namely the length difference between the two interfering paths) Best regards, Eric Le Moal
jjurado  (posted 2011-02-24 14:44:00.0)
Response from Javier at Thorlabs to Sebastian Jaeger: Thank you for contacting us. In order to integrate our shearing interferometers into our cage systems, it is necessary to use the SITST plate. The current design does not feature additional holes for the 30 mm cage system.
user  (posted 2011-02-24 05:21:47.0)
Dear Sir or Madame, is it possible to mount the shearing interferometer in front of an cage-system (e.g. a 30mm cage system) or do I need to go over a SM1 thread by using the SITST plate? Best regards, Sebastian Jäger
Thorlabs  (posted 2010-09-14 08:58:33.0)
Response from Javier at Thorlabs to Holger Fischer: we will contact you directly in order to troubleshoot your application.
fischer  (posted 2010-09-09 07:31:12.0)
Dear Madame or Sir, we have purchased a shearing interferometer (SI100) to determine the collimation of a laser beam. Unfortunately we are not able to see any fringes on the screen of the assembly. The laser beam is well adjusted at 45° to the shear plate with a diameter of about 6-8mm. Different lasers (pulsed and cw) at different wavelengths (780nm, 532nm and 648nm) did not show any result. Do you have any proposition for getting fringes or any contact to get more information on the shearing interferometers? Best regards, Holger Fischer
apalmentieri  (posted 2010-02-02 13:58:56.0)
A response from Adam at Thorlabs to Nick: The wedge angle for these interferometers are 117 arcsec(SI035), 83 Arcsec(SI050), and 40 Arcsec(SI100).
nick  (posted 2010-02-02 13:23:52.0)
Hello, Can you please tell me the wedge angle in the SI035, SI050, and SI100 plates? This is useful in determining fringes across the 500-2000nm range that might be utilized. Thanks, Nick
Laurie  (posted 2009-04-06 16:21:18.0)
Response from Laurie at Thorlabs to msones: Thank you for your interest in our shearing interferometers. Unfortunately, at this time, we do not have the appropriate measurement equipment necessary to determine the degree of fringe tilt in terms of divergence. We regret that we are unable to help you determine this specification. Please let us know if you have additional questions.
msones  (posted 2009-03-30 18:09:51.0)
I need to know the sensitivity of this product: i.e. how many degrees of fringe tilt correspond to how many microradians of divergence (full angle). Assume wavelength = 635nm. Thank you, Mike
Laurie  (posted 2008-07-15 16:31:43.0)
Response from Laurie at Thorlabs to roedel: Dear Christian Rödel: Thank you for your inquiry about our shearing interferometers. I will be contacting you directly with some additional information about the SI750. The clear aperture is 115 mm and the wedge angle is 7 arcsec. If you should need more information, please dont hesitate to contact us.
roedel  (posted 2008-07-15 14:59:12.0)
Dear Sir or Madam, Id like to purchase a shearing interferometer with 50-75mm beam diameter. We want to use it to align collimation but it should be very sensitive. To calculate it can you please send me the parameters of the shearing plate. So the wedge thickness, aperture and angle should be useful. Thanks in advance, Christian Rödel
laurie  (posted 2008-05-06 13:49:04.0)
Response from Laurie at Thorlabs to nolan.real: If you purhcase the SI035 assembly, youll be able to measure beams ranging in diameter from 1-3 mm. Then, you can use the same subassembly (the plate comes off) and replace it with a SI050P to measure beams from 2.5-5mm. I would highly suggest that you also purchase the SIVS accessory. I have used our shearing interferometers personally for beams in this range, and the SIVS is very helpful for discerning the fringes. Thank you for your interest in our products!
nolan.real  (posted 2008-05-06 11:24:16.0)
trying to measure beams from 1-5mm. Do not understand what combination will allow this. will the si035 be able to measure up to 25.4mm with the different plates?
Tyler  (posted 2008-03-13 08:33:19.0)
Response from Tyler at Thorlabs: Dear tliu, thank you for interest in our product. The wedged plate in the interferometer is made from BK7 glass and as a result will absorb the 230 nm radiation. Please consider contacting our technical support department with your need; they can generate a quote for a custom interferometer made with a UV fused silica wedged plate.
tliu  (posted 2008-03-13 05:41:03.0)
Can this shearing Interferometer used for 230nm UV laser beam?

シヤリング干渉計

Shear-Plate with Shearing Interferometer Base
Click to Enlarge
くさび型オプティカルフラットは3つの磁石によって位置固定
  • 1~50 mmのビーム径に対して5つのモデルから選択可能
  • コリメート光を定性的に評価
  • プレートは磁性のスチール製ボールでしっかり固定
  • 利用可能なビーム径はプレート上に刻印

このシヤリング干渉計は、使用するシヤリングプレートによってØ1 mm~Ø50 mmの入射ビームにお使いいただけます。 シヤリング干渉計によって生成される干渉パターンはビームの発散の影響を受けるので、ビームがコリメートされているかを定性的に判断することができます。 右の写真のように、プレート底部に3つのスチール製のボールがついており、磁石でベースへしっかりと固着します。 この磁石による保持機構により、異なるビーム径に使用する際、プレートを簡単に交換することができます。 対応するプレートとベースについては「仕様」タブをご覧ください。

尚、ベースプレートの後ろには穴があるため、くさび形オプティカルフラットから透過する光を妨げません。 SI500以外のモデルでは、この穴はSM1規格です。 SI500の出力開口は、Ø75 mmのなめらかな穴です。ベースプレート、拡散板、シヤリングプレートはキャリーケースに収納された状態で発送されます。

SI100、SI254、SI500ではシヤリングプレートの光学素子の厚さが理由で、シヤリングプレートの背面は取付けプレートから突き出る形になります。 そのため、ベースユニットにシヤリングプレートを取り付けたり外したりする際(特にケージアダプタープレートSICPまたはSICPSM1を取り付ける際)にはご注意ください。

+1 数量 資料 型番 - ユニバーサル規格 定価(税抜) 出荷予定日
SI035 Support Documentation
SI035シヤリング干渉計、ビーム径1~3 mm、シヤリングプレート付き
¥56,271
Today
SI050 Support Documentation
SI050シヤリング干渉計、ビーム径2.5~5 mm、シヤリングプレート付き
¥57,959
Today
SI100 Support Documentation
SI100シヤリング干渉計、ビーム径5~10 mm、シヤリングプレート付き
¥60,350
Today
SI254 Support Documentation
SI254シヤリング干渉計、ビーム径10~25.4 mm、シヤリングプレート付き
¥64,429
Today
SI500 Support Documentation
SI500シヤリング干渉計、ビーム径25.4~50 mm、シヤリングプレート付き
¥110,149
Today

交換用シヤリングプレート

  • 1~50 mmのビーム径に対して5つのモデルから選択可能
  • プレートは複数のシヤリング干渉計本体と併用可能
  • プレートは磁性のスチール製のボールでしっかり固定
  • 利用可能なビーム径はプレート上に刻印

当社では、1 mm~50 mmの入射ビーム径にお使いいただける5種類の取換え可能なシヤリングプレートをご用意しています。これらのプレートは磁石で接続するキネマティック設計になっていて、シヤリング干渉計に正確に設置することができます。複数のプレートが同じベースに取り付けられるので(対応するベースについては下表参照)、もしビーム径が実験中に変わっても、プレートを簡単に交換することができます。ビーム径に適したウェッジ角度となるように、異なるビーム径に対応して様々なシヤリングプレートをご用意しています。

SI100P、SI254P、SI500Pではシヤリングプレートの光学素子の厚さが理由で、シヤリングプレートの背面は取付けプレートから突き出る形になります。そのため、ベースユニットにシヤリングプレートを取り付けたり外したりする際(特にケージアダプタープレートSICPまたはSICPSM1を取り付ける際)にはご注意ください。

Item #Beam Diameter
for Included Plate
Compatible Shearing Interferometer Base Item #
SI035P1 - 3 mmSI035, SI050, SI100, and SI254
SI050P2.5 - 5 mmSI035, SI050, SI100, and SI254
SI100P5 - 10 mmSI035, SI050, SI100, and SI254
SI254P10 - 25.4 mmSI035, SI050, SI100, and SI254
SI500P25.4 - 50 mmSI500


+1 数量 資料 型番 - ユニバーサル規格 定価(税抜) 出荷予定日
SI035P Support Documentation
SI035Pシヤリングプレート、ビーム径1~3 mm
¥20,398
Today
SI050P Support Documentation
SI050Pシヤリングプレート、ビーム径2.5~5 mm
¥22,086
Today
SI100P Support Documentation
SI100Pシヤリングプレート、ビーム径5~10 mm
¥24,336
Today
SI254P Support Documentation
SI254Pシヤリングプレート、ビーム径10~25.4 mm
¥28,557
Today
SI500P Support Documentation
SI500Pシヤリングプレート、ビーム径25.4~50 mm
¥53,035
Lead Time

ビーム観察用アクセサリ

SITST Adapter PlateClick to Enlarge
SITSTには、SMIネジ付き取付けプレートに、1/16インチネジが2個、1/16インチ六角レンチが1個付属しています。
  • 1 mm~10 mm のビーム径に使用
  • 拡散プレート上に干渉縞を拡大して表示

SIVSは、小径ビームによって生成される干渉縞パターンを目視するのに便利なアクセサリです。 SI035、SI050、SI100、SI254a上の標準拡散プレート観察スクリーンをこのアクセサリと交換することによって干渉縞のサイズが拡大し、光がコリメートされたかどうかを確認しやすくなります。干渉縞の拡大はアセンブリのベース部分にN-SF11製平凹レンズ(型番LC2265)を使用すると得られます。SIVSには、シヤリング干渉計への固定用1/16インチネジが2つ付属します。

SIVSの取付けプレート(SITST)のみを別途ご購入いただくことも可能です。このプレートには、当社のネジ規格のSM1ネジ穴があいているので、様々なSM1ネジ部品を取り付けることができます。

Item #Compatible Shearing Interferometer Base Item #
SIVSSI035, SI050, SI100, and SI254a
SITSTSI035, SI050, SI100, and SI254
  • SIVSは、小径ビームによってできる小さな干渉縞の観察用に設計されています。SI254にも対応していますが、SI254の使用を想定している大径ビームの干渉縞を見るための製品ではありません。
+1 数量 資料 型番 - ユニバーサル規格 定価(税抜) 出荷予定日
SIVS Support Documentation
SIVS拡大表示スクリーン、Ø1~10 mmビーム用
¥40,795
Today
SITST Support Documentation
SITSTCustomer Inspired! SM1ネジ付き取付けプレート、シヤリング干渉計用
¥8,159
5-8 Days

30 mmケージアダプタープレート

SICP Exploded View
Click to Enlarge
ケージシステム用アダプタSICPは、シヤリング干渉計に付属する拡散プレートの代わりに2つの#4-40ネジ(付属)で固定することができます。
  • シヤリング干渉計を30 mmケージシステムに組みこむために使用
  • シヤリング干渉計に付属する観測用拡散プレートを外して取り付け
  • 2つの種類をご用意:
    • 組込み型拡散プレート
    • 組込み型SM1ネジ付き観測用プレート

こちらのアダプタープレートは、シヤリング干渉計SI035、SI050、SI100、またはSI254に付属している標準的な観測用拡散プレートを取り外して、干渉計の入力部に30 mmケージシステムまたはSM1レンズチューブシステムを取り付けられるよう設計されております。 SICPには干渉縞が観測できる拡散板が付いています。 SICPSM1にはSM1ネジ穴が付いており、Ø25 mm~Ø25.4 mm(Ø1インチ)レンズチューブなどを、通常干渉縞が観測できる場所に取り付けることが可能となります。

ケージシステムに取り付けるために、プレートにある#4-40のタップ穴を利用するため、通常、プレートを組立て済みのケージシステムに取付けることはできません。 しかし、ケージロッド用アダプタERSCBを使用すればケージシステムを分解することなくプレートの脱着が可能になります。

Item #Compatible Shearing Interferometer Base Item #
SICPSI035, SI050, SI100, and SI254
SICPSM1SI035, SI050, SI100, and SI254
+1 数量 資料 型番 - ユニバーサル規格 定価(税抜) 出荷予定日
SICP Support Documentation
SICPシヤリング干渉計用30 mmケージシステム、拡散プレート付き
¥10,095
Today
SICPSM1 Support Documentation
SICPSM1シヤリング干渉計用30 mmケージシステム、SM1ネジ付き観測用プレート付き
¥9,321
Today
Last Edited: Sep 05, 2013 Author: Sean Harrell