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Aspheric Condenser Lenses


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Aspheric Condenser Lenses

Common Specificationsa
Design WavelengthVisible
Glass TypeB270 Optical Crown Glass
Wavelength RangeUncoated: 380 - 2100 nm
A: 350 - 700 nm
B: 650 - 1050 nm
Reflectance Over AR Coating Range
for Coated Optics (Avg., AOI = 0°)
<0.5%
Uncoated Transmission Graph
(Click Here to Download Raw Data)
Icon
A Coating Reflectance Graph
(Click Here to Download Raw Data)
Icon
B Coating Reflectance Graph
(Click Here to Download Raw Data)
Icon
Diameter Tolerance+0.0 mm / -0.5 mm
Center Thickness Tolerance±0.3 mm
Centration<30 arcmin
Clear Aperture>90%
Maximum Temperature250 °C
  • Please see the Specs tab for more specifications.
Condenser Lens App Shot
Click to Enlarge

The light from an M530L3 530 nm LED is focused onto a ground glass diffuser by an ACL5040-A aspheric condenser lens. The beam is then roughly collimated by a second ACL5040-A lens. The square image of the LED can be seen on the surface of the diffuser. After the diffuser, the beam is uniform. Both condenser lenses are mounted in SCL04 self-centering lens mounts.

Features

  • 13 Different Diameters Available
  • Available Uncoated or with One of Two AR Coatings
  • Offers Higher NA (0.488 to 0.79) and Less Spherical Aberration than Spherical Lenses

High-Efficiency Illumination Applications

  • Light Collection
  • Projection
  • Detection
  • Condensing

These Aspheric Condenser Lenses are ideal for high-efficiency illumination applications. Compared to spherical lenses, our aspheric condenser lenses introduce less aberration, offer larger apertures, and provide lower f/# ratios. These aspheric condenser lenses are designed for collimating light from a lamp, LED, or similar light source; for best performance in this application, the flatter side of the lens should face the source. Shorter focal lengths and a low f/# also allows these lenses to be used in close proximity to one another or other optical elements. This makes them well suited for focusing light onto a detector or light collection.

To offer more flexibility for the design of your optical system, these lenses are available in diameters ranging from 10 to 75 mm. The aspheric surface is precision molded on the aspheric side and ground and polished on the plano or spherical convex side.

For demanding applications, we recommend our CNC-Polished, Precision Aspheres (available with N-BK7, S-LAH64, or UV Fused Silica substrates), which offer diffraction-limited performance at their design wavelength.

Antireflection-Coated Versions
These aspheric condenser lenses are available uncoated for use in the 380 - 2100 nm range, although the lens performance is optimized for visible wavelengths. They are also available with an AR coating for the 350 to 700 nm (-A Coating) or 650 to 1050 nm (-B Coating) range. The Reflectivity curve for the coated versions can be found by clicking on the graph icon in the table above.

Optic Cleaning Tutorial
Optical Coatings and Substrates
Zemax Files
Click on the red Document icon next to the item numbers below to access the Zemax file download.
Item #
Prefix
Diameter
(mm)
fa
(mm)
Focal Length
Tolerance
Focal Shift
(Raw Data)
f/#abClear
Aperture
(mm)
fba
(mm)
Numerical
Aperture

tca
(mm)
tea
(mm)
Surface QualityNon-Aspheric
Surface
Reference
Drawing
ACL108108±5%
Focal Shift
0.8>90%4.20.5475.82.060-40 Scratch-DigPlanoLarge-Diameter Aspheric Lens Drawing
ACL12101210.5±5%
Focal Shift
0.88>90%6.70.5455.82.060-40 Scratch-DigPlano
ACL12708U12.78.0±8%
Focal Shift
0.63>90%3.70.787.51.680-50 Scratch-DigSpherical Convex
ACL15121512±5%
Focal Shift
0.8>90%6.70.5468.02.460-40 Scratch-DigPlano
ACL18151815±5%
Focal Shift
0.83>90%10.50.5346.82.560-40 Scratch-DigPlano
ACL20182018±5%
Focal Shift
0.9>90%12.70.4888.01.860-40 Scratch-DigPlano
ACL25202520±5%
Focal Shift
0.8>90%12.10.54312.02.860-40 Scratch-DigPlano
ACL25416U25.416.0±8%
Focal Shift
0.63>90%7.30.7914.01.280-50 Scratch-DigSpherical Convex
ACL30263026.5±5%
Focal Shift
0.88>90%19.30.52211.03.060-40 Scratch-DigPlano
ACL45324532±5%
Focal Shift
0.71>90%20.90.61218.52.260-40 Scratch-DigSpherical Convex
ACL50405040±5%
Focal Shift
0.8>90%26.20.55421.02.660-40 Scratch-DigPlano
ACL50832U50.832.0±8%
Focal Shift
0.63>90%170.7625.01.980-50 Scratch-DigSpherical Convex
ACL75607560±5%
Focal Shift
0.8>90%40.30.61930.02.360-40 Scratch-DigPlano
  • See the reference drawing for symbol definition.
  • Approximate f/# for the lens obtained by dividing the focal length of the lens by its diameter. Note that this will be an underestimate of the true f/# since the condenser lens cannot be used over its entire diameter.

Aspheric Lens Design Equation

Asphere Coeff

Item #
Prefix
ACL108ACL1210ACL12708UACL1512ACL1815aACL2018ACL2520ACL25416UACL3026ACL4532ACL5040ACL50832UACL7560
R (mm)4.184645.492344.7531246.276967.9049800289.4154410.46168.81819713.859518.28067420.92320118.3225331.384801
k-0.602689-0.623014-1.205071-0.613902-0.67576240-0.639158-0.626528-0.9991715-1.0-1.0-0.640512-0.7980728-1.911446
A2000000007.9E-60000
A42.21E-48.7E-55.3324183E-46.8E-5-2.0269E-41.7E-51.5E-58.6821674E-51.5E-72.0E-62.0E-63.4036234E-65.0E-6
A6001.1162887E-500006.3760123E-81.3E-9006.8362712E-90
A800-3.7455666E-700002.4073084E-9000-1.9656086E-110
A1000-7.6342017E-90000-1.7189021E-1100000
A12001.36022E-100000000000
S2b Radius
(mm)
PlanoPlano-15.6494PlanoPlanoPlanoPlano-69.99948Plano-130Plano-99.63679Plano
  • Values are approximate.
  • S2 is the non-aspheric side of the lens.
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Posted Comments:
Poster: myanakas
Posted Date: 2014-08-07 08:48:37.0
Response from Mike at Thorlabs: Thank you for your feedback. The back-focal length depends on the wavelength. Also in order to determine the correct value you should apply the “Marginal Ray Height” function. This is an optimization for calculating this distance correctly. You would just have to choose it from the pull down menu in the Thickness column. So instead of “V” for Variable please choose “M”. Then this distance is calculated correctly. It is about 19mm, depending on the wavelength. If you like to change the wavelength you can also do that by going into the “WAV” menu on the upper menu of the Zemax window.
Poster:
Posted Date: 2014-07-18 11:08:32.2
Which is the correct BFL of the ACL3026 lens? In the datasheet it is 19.3mm, but in the ZEMAX file it is 22.6mm.
Poster: cdaly
Posted Date: 2014-05-29 04:20:50.0
Response from Chris at Thorlabs: Yes, the focal length is going to be dependent on the wavelength for any lens. For the ACL108, the shift should not be any more than 0.55mm over the full range(380-2100), but I will send you the curve generated from Zemax with more detailed information.
Poster: jp
Posted Date: 2014-05-27 10:36:08.48
Is the focus length of a lens is wavelength dependent? If it is ,how is the relationship between them?
Poster: jlow
Posted Date: 2014-03-27 11:44:08.0
Response from Jeremy at Thorlabs: The prescription is accurate. The ACL line is not a high performance line and are mainly used for less-demanding application. I would recommend our precision CNC-polished aspheres if you require better performance.
Poster:
Posted Date: 2014-03-25 13:37:47.407
There seems to be an error with the prescription data and .zmx file for ACL3026- its modeled performance seems to be far less than other lenses in this category. Is the prescription data for ACL3026 accurate?
Poster: jlow
Posted Date: 2014-02-27 02:21:57.0
Response from Jeremy at Thorlabs: We have made the Zemax file available for download following your feedback.
Poster: james.parker
Posted Date: 2014-02-04 14:10:19.02
Are the zemax files available for the new ACLxxxxxU series of aspheric condenser lenses with the spherical second surface please? Is there a particular design intent or application for these lenses over the regular ACL series? Thank you.
Poster: jlow
Posted Date: 2012-08-02 13:01:00.0
Response from Jeremy at Thorlabs: Using our M365L2 LED, the divergence would be about 2-3° or so (full angle).
Poster: Andreas.Buck
Posted Date: 2012-07-31 03:34:24.0
What degree of collimation is achieveable with the ACL5040? How big is the divergence using an LED like M365?
Poster: tcohen
Posted Date: 2012-02-22 13:12:00.0
Response from Tim at Thorlabs to kmurphy: Thank you for contacting us. I have emailed you the Zemax file. If you need any more information, please feel free to contact us.
Poster: kmurphy
Posted Date: 2012-02-22 11:22:04.0
I would also like the zemax files for these lenses, specifically for ACL1512. Thank you
Poster:
Posted Date: 2011-11-30 07:35:33.0
A response from Tyler at Thorlabs: We will email you the zemax file immeadiately. Please let us know if you have any other needs.
Poster: mvirgen
Posted Date: 2011-11-29 13:27:04.0
I was wondering if i can get the zemax model for this. I have checked and updated the zemax catalog (from your website) and its not included. Thank you.
Poster: sharrell
Posted Date: 2011-09-29 08:44:00.0
A Response from Sean at Thorlabs to Andrew: Thank you for your feedback. We have added the B270 transmission curve, as well as a link to download the transmission data in an Excel spreadsheet. This may be found on the Graphs tab.
Poster: alee
Posted Date: 2011-09-29 11:44:28.0
could you put up the the transmission curves for these please, is the A coating suitable for use with one of your 385nm LED's? the A coating graph suggests it is but the substrate transmision is stated at 380, which sounds a little close to the edge. regards Andrew
Poster: jjurado
Posted Date: 2011-08-31 17:43:00.0
Response from Javier at Thorlabs to john.a.smith: The 4th order coefficient of the ACL2520 specified in the drawing is +1.5E-5. This information also agrees with the zmx model for this lens. I will contact you directly for further support.
Poster: john.a.smith
Posted Date: 2011-08-29 18:34:21.0
Specifications and coefficients for this aspheric lens dont seem consistent according to Zemax. Is the 4th order coefficient for the ACL2520 equal to -1.5e-5, not +1.5e-5? Thanks! John
Poster: Thorlabs
Posted Date: 2010-12-01 15:42:32.0
Response from Javier at Thorlabs to Edgar: I will work with our web team on updating this page with ZEMAX files for the aspheric condenser lenses. In the meantime, I will send you the zmx file for the ACL2520.
Poster: edgar.guevara
Posted Date: 2010-11-30 18:09:24.0
Can you post the full prescription data for ZEMAX, I think it would be very useful for all the users. I am trying to collimate the light from a LED, but I do not know if this aspheric (ACL2520) is enough.
Poster: Thorlabs
Posted Date: 2010-10-11 14:06:22.0
Response from Javier at Thorlabs to saxena.a: We would recommnend using the AL2520-A large diameter aspheric lens for this purpose. This lens, designed for diffraction-limited performance, has a better collection efficiency and better resolution than its ACL counterpart.
Poster: Thorlabs
Posted Date: 2010-07-07 08:28:15.0
Response from Javier at Thorlabs to mrubioroy: thank you for your reply. The easiest way to determine where the principal planes are for this lens is by ray tracing. For this purpose, it is important to know the wavelength(s) that you are working at, since Snells law needs to be applied, and we would need to know the index of refraction of the lens material at the operating wavelength. Also, beam diameter needs to be considered. I will contact you directly to work out all these details.
Poster: mrubioroy
Posted Date: 2010-06-09 12:22:40.0
Response to Javier: I guess my question should be: Can I know where the principal planes are?
Poster: Javier
Posted Date: 2010-06-08 04:24:57.0
Response from Javier at Thorlabs to mrubio: for a thin lens, the effective focal length can be considered as being measured from the center of the lens to the focal point. However, for a thick lens such as the ACL2520, the focal length is measured from one of the pricipal planes, which are basically defined as hypothetical planes were all the refraction is considered to happen. The thin lens equation can be used, but it disregards the distance between these planes. Gullstrands equation takes this distance into account, but the calculation process can get very involved. So, although the answer is not straightforward, you can consider the effective focal length as being measured a few millimiters from the convex surface of the lens. I will contact you directly in case you would like to discuss this further. Regarding your question about back focal length, you are correct; it is measured from the flat, or plano, side.
Poster: mrubio
Posted Date: 2010-06-07 16:20:13.0
From where is the EFL of 20mm on ACL2520 measured? Is the back focal distance measured from the flat side?
Poster: apalmentieri
Posted Date: 2009-11-02 08:15:02.0
A response from Adam at Thorlabs: I will send you all of the aspheric lens data that you will need.
Poster: dinesharakere
Posted Date: 2009-11-02 03:36:18.0
Sir, We had optimized our setup using AL108 and AL1210 combination for a Fluorescence detection (non-imaging application) setup. During websearch can find ACL108 and ACL 1210, which are much cheaper. Can I please have the aspheric lens prescription data - so that I can verify in Zemax that whether the alternate and cheaper substitute can meet the previous design performance.
Poster: klee
Posted Date: 2009-10-12 14:08:37.0
A response from Ken at Thorlabs: You are correct that the flat side should be facing the focus and the curved side should be facing collimation. We will correct this shortly.
Poster: thorlabs
Posted Date: 2009-10-09 21:28:01.0
Is the setup shown here correct? The Aspheric Condenser Lenses page shows two condenser lenses with curved faces toward each other. As I look at your picture, I see collimated light to the left and to the right of the pair (external to the pair) and light focused to a point between the pair. Normally the flat side of the lens faces toward focus and the curved side faces toward collimation.
Poster: apalmentieri
Posted Date: 2009-08-14 16:15:04.0
A response from Adam at Thorlabs: I understand your concerns and will send you all of the prescription information we currently can provide. I will also speak with our technical marketing department about adding this information to our website.
Poster: erik.foerster
Posted Date: 2009-08-14 04:15:33.0
For an optic designer it is imported to know the full description of the optical surfaces. Otherwise this product-information is really void.
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Aspheric Condenser Lenses, Uncoated
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal/Imperial Price Available / Ships
ACL108 Support Documentation
ACL108 Aspheric Condenser Lens, Uncoated, Ø10 mm, f=8 mm
$16.80
Today
ACL1210 Support Documentation
ACL1210 Aspheric Condenser Lens, Uncoated, Ø12 mm, f=10.5 mm
$16.80
Today
ACL12708U Support Documentation
ACL12708U Aspheric Condenser Lens, Uncoated, Ø1/2", f=8 mm
$16.00
Today
ACL1512 Support Documentation
ACL1512 Aspheric Condenser Lens, Uncoated, Ø15 mm, f=12 mm
$15.75
Today
ACL1815 Support Documentation
ACL1815 Aspheric Condenser Lens, Uncoated, Ø18 mm, f=15 mm
$15.75
Today
ACL2018 Support Documentation
ACL2018 Aspheric Condenser Lens, Uncoated, Ø20 mm, f=18 mm
$15.75
Today
ACL2520 Support Documentation
ACL2520 Aspheric Condenser Lens, Uncoated, Ø25 mm, f=20 mm
$17.22
Today
ACL25416U Support Documentation
ACL25416U Aspheric Condenser Lens, Uncoated, Ø1", f=16 mm
$16.40
Today
ACL3026 Support Documentation
ACL3026 Aspheric Condenser Lens, Uncoated, Ø30 mm, f=26.5 mm
$21.00
Today
ACL4532 Support Documentation
ACL4532 Aspheric Condenser Lens, Uncoated, Ø45 mm, f=32 mm
$42.00
Today
ACL5040 Support Documentation
ACL5040 Aspheric Condenser Lens, Uncoated, Ø50 mm, f=40 mm
$42.00
Today
ACL50832U Support Documentation
ACL50832U Aspheric Condenser Lens, Uncoated, Ø2", f=32 mm
$40.00
Today
ACL7560 Support Documentation
ACL7560 Aspheric Condenser Lens, Uncoated, Ø75 mm, f=60 mm
$52.50
Today
Aspheric Condenser Lenses, AR-Coated: 350 - 700 nm
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal/Imperial Price Available / Ships
ACL108-A Support Documentation
ACL108-A Aspheric Condenser Lens, AR-Coated 350-700 nm, Ø10 mm, f=8 mm
$26.46
Today
ACL1210-A Support Documentation
ACL1210-A Aspheric Condenser Lens, AR-Coated 350-700 nm, Ø12 mm, f=10.5 mm
$26.46
3-5 Days
ACL12708U-A Support Documentation
ACL12708U-A Aspheric Condenser Lens, AR-Coated 350-700 nm, Ø1/2", f=8 mm
$25.20
Today
ACL1512-A Support Documentation
ACL1512-A Aspheric Condenser Lens, AR-Coated 350-700 nm, Ø15 mm, f=12 mm
$25.41
Today
ACL1815-A Support Documentation
ACL1815-A Aspheric Condenser Lens, AR-Coated 350-700 nm, Ø18 mm, f=15 mm
$25.41
Today
ACL2018-A Support Documentation
ACL2018-A Aspheric Condenser Lens, AR-Coated 350-700 nm, Ø20 mm, f=18 mm
$25.41
Today
ACL2520-A Support Documentation
ACL2520-A Aspheric Condenser Lens, AR-Coated 350-700 nm, Ø25 mm, f=20 mm
$26.88
Today
ACL25416U-A Support Documentation
ACL25416U-A Aspheric Condenser Lens, AR-Coated 350-700 nm, Ø1", f=16 mm
$25.60
Today
ACL3026-A Support Documentation
ACL3026-A Aspheric Condenser Lens, AR-Coated 350-700 nm, Ø30 mm, f=26.5 mm
$30.66
Lead Time
ACL4532-A Support Documentation
ACL4532-A Aspheric Condenser Lens, AR-Coated 350-700 nm, Ø45 mm, f=32 mm
$51.66
Today
ACL5040-A Support Documentation
ACL5040-A Aspheric Condenser Lens, AR-Coated 350-700 nm, Ø50 mm, f=40 mm
$51.66
Today
ACL50832U-A Support Documentation
ACL50832U-A Aspheric Condenser Lens, AR-Coated 350-700 nm, Ø2", f=32 mm
$49.20
Today
ACL7560-A Support Documentation
ACL7560-A Aspheric Condenser Lens, AR-Coated 350-700 nm, Ø75 mm, f=60 mm
$62.16
3-5 Days
Aspheric Condenser Lenses, AR-Coated: 650 - 1050 nm
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal/Imperial Price Available / Ships
ACL108-B Support Documentation
ACL108-B Aspheric Condenser Lens, AR-Coated 650-1050 nm, Ø10 mm, f=8 mm
$26.46
Today
ACL1210-B Support Documentation
ACL1210-B Aspheric Condenser Lens, AR-Coated 650-1050 nm, Ø12 mm, f=10.5 mm
$26.46
Today
ACL12708U-B Support Documentation
ACL12708U-B Aspheric Condenser Lens, AR-Coated 650-1050 nm, Ø1/2", f=8 mm
$25.20
Today
ACL1512-B Support Documentation
ACL1512-B Aspheric Condenser Lens, AR-Coated 650-1050 nm, Ø15 mm, f=12 mm
$25.41
Today
ACL1815-B Support Documentation
ACL1815-B Aspheric Condenser Lens, AR-Coated 650-1050 nm, Ø18 mm, f=15 mm
$25.41
Today
ACL2018-B Support Documentation
ACL2018-B Aspheric Condenser Lens, AR-Coated 650-1050 nm, Ø20 mm, f=18 mm
$25.41
Today
ACL2520-B Support Documentation
ACL2520-B Aspheric Condenser Lens, AR-Coated 650-1050 nm, Ø25 mm, f=20 mm
$26.88
Today
ACL25416U-B Support Documentation
ACL25416U-B Aspheric Condenser Lens, AR-Coated 650-1050 nm, Ø1", f=16 mm
$25.60
Today
ACL3026-B Support Documentation
ACL3026-B Aspheric Condenser Lens, AR-Coated 650-1050 nm, Ø30 mm, f=26.5 mm
$30.66
Today
ACL4532-B Support Documentation
ACL4532-B Aspheric Condenser Lens, AR-Coated 650-1050 nm, Ø45 mm, f=32 mm
$51.66
Today
ACL5040-B Support Documentation
ACL5040-B Aspheric Condenser Lens, AR-Coated 650-1050 nm, Ø50 mm, f=40 mm
$51.66
Today
ACL50832U-B Support Documentation
ACL50832U-B Aspheric Condenser Lens, AR-Coated 650-1050 nm, Ø2", f=32 mm
$49.20
Today
ACL7560-B Support Documentation
ACL7560-B Aspheric Condenser Lens, AR-Coated 650-1050 nm, Ø75 mm, f=60 mm
$62.16
Today
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