The aspheric coefficients in Zemax file have the same sign:
-0.00015041
-2.451e-006
-0.00000002547
The aspheric coefficients shown in this page have different signs:
-0.00015041
-2.451e-006
-0.00000002547
YLohia
 (posted 2019-04-04 09:02:11.0)
Hello, thank you for contacting Thorlabs. The aspheric coefficients change sign based on the direction the lens is pointing. The coefficients are correct in Zemax as well as the info icon. All of these coefficients should have the same sign. That being said, we did find an issue with the signs on the product page of this lens (https://www.thorlabs.com/thorproduct.cfm?partnumber=A397-A) and are working to correct it.
yusefzadib
 (posted 2017-04-14 15:36:40.633)
Hi
I used bellow products to setup a laser source:
1.C110TMD-A, f = 6.24 mm, NA = 0.40,
2.L638P700M, 638 nm, 700 mW, Ø5.6 mm,G Pin code
3.LDH56-P2/M, 30 mm Cage Plate Collimation Mount
4.SR9HF, ESD Protection and Strain Relief Cable, Pin Codes F and G, 7.5 V
However, I couldn't get a suitable collimated beam. It was
It should be mentioned that all focal distances were checked with precise devices.
tfrisch
 (posted 2017-04-28 09:46:34.0)
Hello, thank you for contacting Thorlabs. I notice that your source is a multimode laser diode which is expected to have greater divergence at collimation than a similar single mode source. I will reach out to you directly about your application.
richard
 (posted 2017-02-16 13:08:52.723)
Hello,
I was wondering if you could provide the concentricity tolerance between the mounted optic and the 9.24 mm OD of your M9 threaded mounted aspheres (such as A397TM-A).
tfrisch
 (posted 2017-03-01 05:00:18.0)
Hello, thank you for contacting Thorlabs. Most units will be seated better than the absolute tolerances of the lens and bore diameters, but 0.19mm is the worst case scenario.
chiwon.lee
 (posted 2017-01-09 10:06:57.053)
Hello, is it possible to manufature aspheric lenes with deep UV (250 nm) anti-reflective coating?
tfrisch
 (posted 2017-01-09 11:59:30.0)
Hello, thank you for contacting Thorlabs. So far into the UV, absorption will be come a concern. I will reach out to you directly with information on materials that may be suitable for a UV range asphere.
mbennahmias
 (posted 2016-06-27 10:54:25.437)
Hello,
I would like to know what is the laser induced damage threshold for this optical element / AR coating.
I am using a 0.2 W 375 nm laser diode and the diverging beam size at this location is ~ 0.1 to 0.2 mm
andrew.logan
 (posted 2014-12-16 13:52:10.44)
In the drawings for the 354560-A you give the tolerance on the lens diameter at +/- 0.15 mm, whereas Lightpath's 2014 pdf catalogue shows their typical tolerance as +/- 0.015 mm. Is this a typo, or does the 354560 have a tolerance that is an order of magnitude worse than what is typical of Lightpath?
Thanks
myanakas
 (posted 2015-01-14 02:19:40.0)
Response from Mike at Thorlabs: Thank you for your feedback. This is a typo, the correct tolerance is +/- 0.015. We are currently working to have the website updated to correct this.
moritz.kick
 (posted 2014-01-07 15:25:08.0)
Hi,
we want to couple a laser beam into and out of a fiber. The wavelength is 580 nm, we use the 460-HP fiber (MFD 3.5µm) and the Collimated Beam Diameter prior to Lens is about 1.3 mm.
I calculated f as 6.16 so the best aspheric lens for coupling the light into the fiber would be the item 352170-A. Is this correct so far?
But what kind of lense do I need to collimate the beam past the fiber. Can I use the same lense for both sides?
Thanks for your support
jlow
 (posted 2014-01-08 05:10:48.0)
Response from Jeremy at Thorlabs: At 580nm, the estimated MFD of the 460HP fiber is around 3.9µm nominally. Therefore, the ideal focal length lens would have around 6.8mm focal length. Using that number, the closest focal length asphere that would give you the best theoretical coupling efficiency would be the A375-A (7.5mm focal length). However, the difference with using the 6.24mm focal length asphere is relatively small (<0.5% absolute). For the collimation on the other end, it depends on the beam diameter and beam divergence you are looking to have on the output. Longer focal length would give you larger beam diameter and smaller beam divergence. You can use the same focal length lens on the output as well.
tcohen
 (posted 2012-09-04 10:05:00.0)
Response from Tim at Thorlabs: Thank you for contacting us. For the most efficiency in our support, a member of our China support team will contact you directly.
Response from Buki at Thorlabs.com
Thank you for participating in our Feedback Forum. We can provide custom coatings on our lenses. We have contacted you to get more information from you in order to provide a quote.
c2hollow
 (posted 2011-11-14 15:14:57.0)
Is it possible to get the C330TME-A with 405nm V-coating?
AR Coating Abbreviations
Abbreviation
Description
U
Uncoated: Optics do not have an AR Coating of any kind
A
Broadband AR Coating for the 350 - 700 nm or 400 - 600 nm range
B
Broadband AR Coating for the 600 - 1050 nm or 650 - 1050 nm range
C
Broadband AR Coating for the 1050 - 1620 nm or 1050 - 1700 nm range
V
Narrowband AR Coating designed for the wavelength listed in the table below