Aspheric Condenser Lenses with Diffuser surface on the Plano side
|Substrate||B270 Optical Crown Glass|
|Wavelength Range||380 - 2100 nm (Uncoated)|
350 - 700 nm (-A Coating)
650 - 1050 nm (-B Coating)
|Focal Length Tolerance||±5%|
|Surface Quality||60-40 (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|
|ACL2520-DG6||25 mm||20 mm||0.80||600||0.543|
|ACL2520-DG15||25 mm||20 mm||0.80||1500||0.543|
|ACL5040-DG6||50 mm||40 mm||0.80||600||0.554|
|ACL5040-DG15||50 mm||40 mm||0.80||1500||0.554|
*-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.
- Combines a Condenser and a Diffuser into a compact Single 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 Condensers with Diffusers are designed for collimating light from lamp, LED, or similar light sources with 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. For many applications this is not desired (see the first application photograph on the right under the specs table). Adding a diffuser on the plano surface ensures a uniform illumination of the light source in far field, as shown in the second photograph on the right. Detailed descriptions can be found in the captions of the enlarged photos.
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.