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Aspheric Condenser Lenses with Diffuser Surface on the Plano Side


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General Specifications
SubstrateB270 Optical Crown Glass
Wavelength Range380 - 2100 nm (Uncoated)
350 - 700 nm (-A Coating)
650 - 1050 nm (-B Coating)
Focal Length Tolerance±5%
Design WavelengthVisible
Surface Quality60-40 (Scratch-Dig)
Diameter Tolerance+0.0 mm / -0.5 mm
Center Thickness Tolerance±0.3 mm
Edge Thickness Tolerance±0.3 mm
Centering Tolerance (Wedge)30 arcmin
Temperature (Max)250 °C
RoHSCompliant
Item #*Diameterff/#**GritNA
ACL2520-DG625 mm20 mm0.806000.543
ACL2520-DG1525 mm20 mm0.8015000.543
ACL5040-DG650 mm40 mm0.806000.554
ACL5040-DG1550 mm40 mm0.8015000.554

*-A and -B coated items share the same specifications shown in the table.
**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.

app shot
Click to Enlarge
Light from an LED Collimated by a Non-Diffuse 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 with One of Two AR Coatings on Aspheric Surface
  • Offers Higher NA and Less Spherical Aberration 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.

When collimating high-power LEDs, the structure of the source can ultimately be imaged and shows 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
B270 Transmission
Click Here for Raw Data
Click to Enlarge
A AR Coating
Click to Enlarge

Click Here for Raw Data
The blue shaded region indicates the specified 350 - 700 nm wavelength range for optimum performance.
B AR Coating
Click to Enlarge

Click Here for Raw Data
The blue shaded region indicates the specified 650 - 1050 nm wavelength range for optimum performance.

Thorlabs' Standard Broadband Antireflection Coatings

Click the Support Documentation icon document icon or Part Number below to view the available support documentation
Part Number Product Description
ACL2520-DG15 Support Documentation ACL2520-DG15 : Aspheric Condenser Lens w/ Diffuser, Ø25 mm, f=20 mm, 1500 Grit, Uncoated
ACL2520-DG15-A Support Documentation ACL2520-DG15-A : Aspheric Condenser Lens w/ Diffuser, Ø25 mm, f=20 mm, 1500 Grit, ARC: 350 nm - 700 nm
ACL2520-DG15-B Support Documentation ACL2520-DG15-B : Aspheric Condenser Lens w/ Diffuser, Ø25 mm, f=20 mm, 1500 Grit, ARC: 650 nm - 1050 nm
ACL2520-DG6 Support Documentation ACL2520-DG6 : Aspheric Condenser Lens w/ Diffuser, Ø25 mm, f=20 mm, 600 Grit, Uncoated
ACL2520-DG6-A Support Documentation ACL2520-DG6-A : Aspheric Condenser Lens w/ Diffuser, Ø25 mm, f=20 mm, 600 Grit, ARC: 350 nm - 700 nm
ACL2520-DG6-B Support Documentation ACL2520-DG6-B : Aspheric Condenser Lens w/ Diffuser, Ø25 mm, f=20 mm, 600 Grit, ARC: 650 nm - 1050 nm
Part Number Product Description
ACL5040-DG15 Support Documentation ACL5040-DG15 : Aspheric Condenser Lens w/ Diffuser, Ø50 mm, f=40 mm, 1500 Grit, Uncoated
ACL5040-DG15-A Support Documentation ACL5040-DG15-A : Aspheric Condenser Lens w/ Diffuser, Ø50 mm, f=40 mm, 1500 Grit, ARC: 350 nm - 700 nm
ACL5040-DG15-B Support Documentation ACL5040-DG15-B : Aspheric Condenser Lens w/ Diffuser, Ø50 mm, f=40 mm, 1500 Grit, ARC: 650 nm - 1050 nm
ACL5040-DG6 Support Documentation ACL5040-DG6 : Aspheric Condenser Lens w/ Diffuser, Ø50 mm, f=40 mm, 600 Grit, Uncoated
ACL5040-DG6-A Support Documentation ACL5040-DG6-A : Aspheric Condenser Lens w/ Diffuser, Ø50 mm, f=40 mm, 600 Grit, ARC: 350 nm - 700 nm
ACL5040-DG6-B Support Documentation ACL5040-DG6-B : Aspheric Condenser Lens w/ Diffuser, Ø50 mm, f=40 mm, 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.
Click on any phrase below to search our site using our new Search Engine:
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Aspheric Condensers with Diffusers on Plano Surface, 600 Grit

Item #* Diameter
(mm)
Focal
Length
(mm)
f/#** Clear
Aperture
(mm)
Back Focal
Length
(mm)
Numerical
Aperture
(NA)
Center
Thickness
(mm)
Edge
Thickness
(mm)
Non-Aspheric
Surface
Reference
Drawing
ACL2520-DG6 25 20 0.80 >90% 12.10 0.543 12 2.76 Plano Large-Diameter Aspheric Lens Drawing
ACL5040-DG6 50 40 0.80 >90% 26.20 0.554 21 2.62 Plano

*-A and -B coated items share the same specifications shown in the table.
**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.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal/Imperial Price Available / Ships
ACL2520-DG6 Support Documentation
ACL2520-DG6 Aspheric Condenser Lens w/ Diffuser, Ø25 mm, f=20 mm, 600 Grit, Uncoated
$17.22
Today
ACL2520-DG6-A Support Documentation
ACL2520-DG6-A Aspheric Condenser Lens w/ Diffuser, Ø25 mm, f=20 mm, 600 Grit, ARC: 350 nm - 700 nm
$26.88
Today
ACL2520-DG6-B Support Documentation
ACL2520-DG6-B Aspheric Condenser Lens w/ Diffuser, Ø25 mm, f=20 mm, 600 Grit, ARC: 650 nm - 1050 nm
$26.88
Today
ACL5040-DG6 Support Documentation
ACL5040-DG6 Aspheric Condenser Lens w/ Diffuser, Ø50 mm, f=40 mm, 600 Grit, Uncoated
$42.00
Today
ACL5040-DG6-A Support Documentation
ACL5040-DG6-A Aspheric Condenser Lens w/ Diffuser, Ø50 mm, f=40 mm, 600 Grit, ARC: 350 nm - 700 nm
$51.66
Today
ACL5040-DG6-B Support Documentation
ACL5040-DG6-B Aspheric Condenser Lens w/ Diffuser, Ø50 mm, f=40 mm, 600 Grit, ARC: 650 nm - 1050 nm
$51.66
Today

Aspheric Condensers with Diffusers on Plano Surface, 1500 Grit

Item #* Diameter
(mm)
Focal
Length
(mm)
f/#** Clear
Aperture
(mm)
Back Focal
Length
(mm)
Numerical
Aperture
(NA)
Center
Thickness
(mm)
Edge
Thickness
(mm)
Non-Aspheric
Surface
Reference
Drawing
ACL2520-DG15 25 20 0.80 >90% 12.10 0.543 12 2.76 Plano Large-Diameter Aspheric Lens Drawing
ACL5040-DG15 50 40 0.80 >90% 26.20 0.554 21 2.62 Plano

*-A and -B coated items share the same specifications shown in the table.
**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.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal/Imperial Price Available / Ships
ACL2520-DG15 Support Documentation
ACL2520-DG15 Aspheric Condenser Lens w/ Diffuser, Ø25 mm, f=20 mm, 1500 Grit, Uncoated
$17.22
Today
ACL2520-DG15-A Support Documentation
ACL2520-DG15-A Aspheric Condenser Lens w/ Diffuser, Ø25 mm, f=20 mm, 1500 Grit, ARC: 350 nm - 700 nm
$26.88
Today
ACL2520-DG15-B Support Documentation
ACL2520-DG15-B Aspheric Condenser Lens w/ Diffuser, Ø25 mm, f=20 mm, 1500 Grit, ARC: 650 nm - 1050 nm
$26.88
Today
ACL5040-DG15 Support Documentation
ACL5040-DG15 Aspheric Condenser Lens w/ Diffuser, Ø50 mm, f=40 mm, 1500 Grit, Uncoated
$42.00
Today
ACL5040-DG15-A Support Documentation
ACL5040-DG15-A Aspheric Condenser Lens w/ Diffuser, Ø50 mm, f=40 mm, 1500 Grit, ARC: 350 nm - 700 nm
$51.66
Today
ACL5040-DG15-B Support Documentation
ACL5040-DG15-B Aspheric Condenser Lens w/ Diffuser, Ø50 mm, f=40 mm, 1500 Grit, ARC: 650 nm - 1050 nm
$51.66
Today
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