Positive Fresnel lenses are optical elements designed to focus or collimate light with minimal material thickness. The SC 297 lens has a focal length of 42.4 mm, a clear aperture of 29.8 mm, and a thickness of 1.8 mm, with infinity as the plano conjugate and 42.4 mm as the Fresnel conjugate. It is manufactured from PMMA with a standard refractive index of 1.49, and its focal length is specified for 546 nm wavelength with a tolerance of ±5%. All lenses in this series share a uniform thickness of 1.8 mm, except for two variants, SC 903 and SC 943, which are 2.5 mm thick. Outside dimensions may extend up to 20 mm beyond the clear aperture.
Positive Fresnel Lenses can be designed as a collimator, collector or with finite conjugates. They are usually corrected for spherical aberration.
The designs can be trimmed according to customer requirements (within limits of clear aperture). It is possible to combine a Fresnel lens structure with other structures like diffusers or microlens arrays in the same part through double-sided structuring. Optical coatings for increased efficiency are possible.
| ORAFOL Fresnel Optics GmbH | |
|---|---|
| Product Category | Optical Lenses |
| Product Number | SC 297 |
| Product Name | Positive Fresnel Lense |
| Lens Type | Fresnel Lens |
