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Aspheric Condenser Lenses with Diffuser Surface


  • Combines Aspheric Condenser with Diffuser on the Plano Side of the Lens
  • 600 Grit and 1500 Grit Versions Available
  • Uncoated or AR Coated for 350 - 700 nm or 650 - 1050 nm
  • Lenses with NA of 0.60

ACL5040U-DG15-A

(Ø50 mm)

ACL2520U-DG15

(Ø25 mm)

ACL5040U-DG6-B

(Ø50 mm)

Plano Surface of ACL5040U-DG15

Related Items

General Specifications
Substrate B270 Optical Crown Glass
Wavelength Range Uncoated: 380 - 2100 nm
A: 350 - 700 nm
B: 650 - 1050 nm
Reflectance Over AR Coating Range
for Coated Optics (Avg., AOI = 0°)
Ravg < 0.5%
Focal Length Tolerance ±8%
Design Wavelength Visible
Surface Quality (Asphere Side) 80-50 Scratch-Dig
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
Edge Thickness Tolerance ±0.3 mm
Centration <30 arcmin
Temperature (Max) 250 °C (482 °F)
app shot
Click to Enlarge
Light from an LED Collimated by a Non-Diffusing Condenser Lens
app shot
Click to Enlarge
Light from an LED Collimated by a Condenser Lens with a Diffuser Surface

Features

  • Combines a Condenser and a Diffuser into a Single, Compact Optic
  • 25 mm and 50 mm Diameters Available
  • 600 or 1500 Grit Polished Versions Available
  • 20 mm or 40 mm Focal Length Versions Available
  • Available Uncoated or AR-Coated for 350 - 700 nm or 650 - 1050 nm on Aspheric Surface
  • Offers Higher NA and Larger Aperture than Spherical Lenses

Thorlabs' Aspheric Condenser Lenses with Diffusers are designed for collimating light from lamps, LEDs, or similar sources into a highly uniform illumination pattern. We offer two sizes (Ø25 mm and Ø50 mm) to accommodate varying application needs. These lenses are available in either 600 grit or 1500 grit polished versions. A finer grind (e.g., 1500 grit) provides a higher transmittance, while a more coarse grind (e.g,. 600 grit) creates a greater amount of diffusion at the expense of transmission. These aspheric condenser lenses are available uncoated for use in the 380 - 2100 nm range or with an AR coating for the 350 to 700 nm (-A Coating) or 650 to 1050 nm (-B Coating) range. For reflectance plots, please see the table to the right.

When collimating high-power LEDs with a standard lens, the structure of the source can ultimately be imaged through the lens, resulting in a highly non-uniform illumination pattern (see the top image on the right). For many applications, this is not desired. Adding a diffuser on the plano surface ensures a uniform illumination of the light source in the far field (see the bottom image on the right).

The aspheric surface is precision molded on the aspheric side and polished with 600 or 1500 grit on the plano side. Polished diffusers are advantageous over sand blasted diffusers as the surface has greater uniformity.

Thorlabs offers many types of mounting solutions for these lenses. Please visit our Fixed Optic Mounts Guide and Mirror Mounts Guide for possible mouting options available.

Optic Cleaning Tutorial
Optical Coatings and Substrates
Lens Tutorial

Aspheric Lens Design Equation

Asphere Coeff

Item #
Prefixa
ACL2520UACL5040U
R (mm) 10.462 20.923
k -0.6265 -0.6405
A2 0 0
A4 1.5E-5 2.0E-6
A6 0 0
A8 0 0
A10 0 0
A12 0 0
S2b Radius
(mm)
Plano Plano
  • Values are approximate.
  • S2 is the non-aspheric side of the lens.
Documents Tab to be Discontinued...
Please note that this tab will be removed at the end of 2015. The same information displayed here can be found by clicking on the red Docs Icon (Support Documentation icon) next to the item of interest in the pricing area below.
Click the Support Documentation icon document icon or Part Number below to view the available support documentation
Part NumberProduct Description
ACL2520U-DG15 Support Documentation ACL2520U-DG15:Aspheric Condenser Lens w/ Diffuser, Ø25 mm, f=20.1 mm, NA=0.60, 1500 Grit, Uncoated
ACL2520U-DG15-A Support Documentation ACL2520U-DG15-A:Aspheric Condenser Lens w/ Diffuser, Ø25 mm, f=20.1 mm, NA=0.60, 1500 Grit, ARC: 350 nm - 700 nm
ACL2520U-DG15-B Support Documentation ACL2520U-DG15-B:Aspheric Condenser Lens w/ Diffuser, Ø25 mm, f=20.1 mm, NA=0.60, 1500 Grit, ARC: 650 nm - 1050 nm
ACL2520U-DG6 Support Documentation ACL2520U-DG6:Aspheric Condenser Lens w/ Diffuser, Ø25 mm, f=20.1 mm, NA=0.60, 600 Grit, Uncoated
ACL2520U-DG6-A Support Documentation ACL2520U-DG6-A:Aspheric Condenser Lens w/ Diffuser, Ø25 mm, f=20.1 mm, NA=0.60, 600 Grit, ARC: 350 nm - 700 nm
ACL2520U-DG6-B Support Documentation ACL2520U-DG6-B:Aspheric Condenser Lens w/ Diffuser, Ø25 mm, f=20.1 mm, NA=0.60, 600 Grit, ARC: 650 nm - 1050 nm
Part NumberProduct Description
ACL5040U-DG15 Support Documentation ACL5040U-DG15:Aspheric Condenser Lens w/ Diffuser, Ø50 mm, f=40 mm, NA=0.60, 1500 Grit, Uncoated
ACL5040U-DG15-A Support Documentation ACL5040U-DG15-A:Aspheric Condenser Lens w/ Diffuser, Ø50 mm, f=40 mm, NA=0.60, 1500 Grit, ARC: 350 nm - 700 nm
ACL5040U-DG15-B Support Documentation ACL5040U-DG15-B:Aspheric Condenser Lens w/ Diffuser, Ø50 mm, f=40 mm, NA=0.60, 1500 Grit, ARC: 650 nm - 1050 nm
ACL5040U-DG6 Support Documentation ACL5040U-DG6:Aspheric Condenser Lens w/ Diffuser, Ø50 mm, f=40 mm, NA=0.60, 600 Grit, Uncoated
ACL5040U-DG6-A Support Documentation ACL5040U-DG6-A:Aspheric Condenser Lens w/ Diffuser, Ø50 mm, f=40 mm, NA=0.60, 600 Grit, ARC: 350 nm - 700 nm
ACL5040U-DG6-B Support Documentation ACL5040U-DG6-B:Aspheric Condenser Lens w/ Diffuser, Ø50 mm, f=40 mm, NA=0.60, 600 Grit, ARC: 650 nm - 1050 nm

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Posted Comments:
Poster:tcohen
Posted Date:2013-01-03 12:16:00.0
Response from Tim at Thorlabs to Stephan: We do not have Zemax models for these currently. We will take an empirical scan and model the surface to simulate the diffuser scatter onto the ACL2520 Zemax models.
Poster:shenze
Posted Date:2012-12-18 15:19:37.357
Hello, can you provide ZEMAX or TracePro data for ACL2520-DG6-A and ACL2520-DG15-A? Thank you in advance. Stephan
Poster:tcohen
Posted Date:2012-03-02 18:06:00.0
Response from Tim at Thorlabs to paul.lauria: Thank you for contacting us. I have sent you the data directly.
Poster:paul.lauria
Posted Date:2012-03-01 14:42:08.0
Hi, is there a Zemax file for a ACL2520-DG6-A? Thank you.

Aspheric Condensers with Diffusers on Plano Surface, 600 Grit

Item # PrefixaDiameter
(mm)
fa
(mm)
Focal Shift
(Raw Data)
f/#bClear
Aperture
(mm)
fba
(mm)
Numerical
Aperture
(NA)c
tca
(mm)
tea
(mm)
Non-Aspheric
Surface
Reference
Drawing
ACL2520U-DG6 25.0 20.1 ± 8% Focal Shift 0.89 >22.5 12 0.60 12.0 2.8 Plano Large-Diameter Aspheric Lens Drawing
ACL5040U-DG6 50.0 40.0 ± 8% Focal Shift 0.89 >45.0 26 0.60 21.0 2.6 Plano
  • -A and -B coated items share the same specifications shown in the table.
  • f/# is defined as the focal length divided by the clear aperture of the lens.
  • Numerical Aperture (NA) is calculated from the sine of the marginal ray angle.
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available / Ships
ACL2520U-DG6 Support Documentation
ACL2520U-DG6NEW!Aspheric Condenser Lens w/ Diffuser, Ø25 mm, f=20.1 mm, NA=0.60, 600 Grit, Uncoated
$17.70
Today
ACL2520U-DG6-A Support Documentation
ACL2520U-DG6-ANEW!Aspheric Condenser Lens w/ Diffuser, Ø25 mm, f=20.1 mm, NA=0.60, 600 Grit, ARC: 350 nm - 700 nm
$27.70
Today
ACL2520U-DG6-B Support Documentation
ACL2520U-DG6-BNEW!Aspheric Condenser Lens w/ Diffuser, Ø25 mm, f=20.1 mm, NA=0.60, 600 Grit, ARC: 650 nm - 1050 nm
$27.70
Today
ACL5040U-DG6 Support Documentation
ACL5040U-DG6NEW!Aspheric Condenser Lens w/ Diffuser, Ø50 mm, f=40 mm, NA=0.60, 600 Grit, Uncoated
$43.30
Today
ACL5040U-DG6-A Support Documentation
ACL5040U-DG6-ANEW!Aspheric Condenser Lens w/ Diffuser, Ø50 mm, f=40 mm, NA=0.60, 600 Grit, ARC: 350 nm - 700 nm
$53.20
Today
ACL5040U-DG6-B Support Documentation
ACL5040U-DG6-BNEW!Aspheric Condenser Lens w/ Diffuser, Ø50 mm, f=40 mm, NA=0.60, 600 Grit, ARC: 650 nm - 1050 nm
$53.20
Today

Aspheric Condensers with Diffusers on Plano Surface, 1500 Grit

Item # PrefixaDiameter
(mm)
Focal
Length
(mm)
f/#bFocal Shift
(Raw Data)
Clear
Aperture
(mm)
Back Focal
Length
(mm)
Numerical
Aperture
(NA)c
Center
Thickness
(mm)
Edge
Thickness
(mm)
Non-Aspheric
Surface
Reference
Drawing
ACL2520U-DG15 25.0 20.1 ± 8% 0.89 Focal Shift >22.5 12 0.60 12.0 2.8 Plano Large-Diameter Aspheric Lens Drawing
ACL5040U-DG15 50.0 40.0 ± 8% 0.89 Focal Shift >45.0 26 0.60 21.0 2.6 Plano
  • -A and -B coated items share the same specifications shown in the table.
  • f/# is defined as the focal length divided by the clear aperture of the lens.
  • Numerical Aperture (NA) is calculated from the sine of the marginal ray angle.
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available / Ships
ACL2520U-DG15 Support Documentation
ACL2520U-DG15NEW!Aspheric Condenser Lens w/ Diffuser, Ø25 mm, f=20.1 mm, NA=0.60, 1500 Grit, Uncoated
$17.70
Today
ACL2520U-DG15-A Support Documentation
ACL2520U-DG15-ANEW!Aspheric Condenser Lens w/ Diffuser, Ø25 mm, f=20.1 mm, NA=0.60, 1500 Grit, ARC: 350 nm - 700 nm
$27.70
Today
ACL2520U-DG15-B Support Documentation
ACL2520U-DG15-BNEW!Aspheric Condenser Lens w/ Diffuser, Ø25 mm, f=20.1 mm, NA=0.60, 1500 Grit, ARC: 650 nm - 1050 nm
$27.70
Today
ACL5040U-DG15 Support Documentation
ACL5040U-DG15NEW!Aspheric Condenser Lens w/ Diffuser, Ø50 mm, f=40 mm, NA=0.60, 1500 Grit, Uncoated
$43.30
Today
ACL5040U-DG15-A Support Documentation
ACL5040U-DG15-ANEW!Aspheric Condenser Lens w/ Diffuser, Ø50 mm, f=40 mm, NA=0.60, 1500 Grit, ARC: 350 nm - 700 nm
$53.20
Today
ACL5040U-DG15-B Support Documentation
ACL5040U-DG15-BNEW!Aspheric Condenser Lens w/ Diffuser, Ø50 mm, f=40 mm, NA=0.60, 1500 Grit, ARC: 650 nm - 1050 nm
$53.20
Today
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