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2.0" x 2.0", 0.85" FL, Aspheric Fresnel Lens

Aspherically Contoured Fresnel Lenses

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Stock #32-587 3-4 days
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£30.60
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£30.60
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£26.35
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Effective Focal Length EFL (mm):
21.59
Substrate: Many glass manufacturers offer the same material characteristics under different trade names. Learn More
Acrylic
Coating:
Uncoated
Type:
Fresnel Lens
Wavelength Range (nm):
400 - 1100
Center Thickness CT (inches):
0.06
Dimensional Tolerance (inches):
±0.05
Dimensions (inches):
2.0 x 2.0
Dimensions (mm):
50.8 x 50.8
Effective Diameter (inches):
1.3
Effective Focal Length EFL (inches):
0.85
Groove Density (grooves/inch):
200.00
Index of Refraction nd:
1.49
Operating Temperature (°C):
80 (Maximum)
Thickness Tolerance (%):
±40
Transmission (%):
85 (Typical)

Regulatory Compliance

RoHS 2015:
Reach 224:
Certificate of Conformance:

Product Family Description

  • Thin, Flat Lenses for Focusing Applications
  • Large Sizes for Maximum Light Collection
  • Aspherically-Grooved Contours for Enhanced Performance

Aspherically Contoured Fresnel Lenses are thin, flat lenses for focusing applications. A Fresnel lens replaces the curved surface of a conventional lens with a series of concentric grooves, molded into the surface of a thin, lightweight plastic sheet. The grooves act as individual refracting surfaces, like tiny prisms when viewed in cross section, bending parallel rays in a very close approximation to a common focal length. Aspherically Contoured Fresnel Lenses are thin, so very little light is lost by absorption. Fresnel lenses are a compromise between efficiency and image quality. High groove density allows higher quality images, while low groove density yields better efficiency (as needed in light gathering applications). In infinite conjugate systems, the grooved side of the lens should face the longer conjugate. 

Fresnel lenses are most often used in light gathering applications, such as condenser systems or emitter/detector setups. Fresnel lenses can also be used as magnifiers or projection lenses; however, due to the high level of distortion, this is not recommended.