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CaF2半月正透镜
CaF2 Positive Meniscus Lenses
商品货号:ECS002499
商品品牌:Thorlabs
详细介绍
Features
  • Vacuum-Grade Calcium Fluoride Substrate
  • Ø1/2" and Ø1" Versions Available
  • Broadband AR Coating for the 3 - 5 μm Range
  • Focal Lengths from -40.0 to -1000.0 mm

Specifications
Wavelength Range
0.18 - 8.0 μm
AR Coating Range
3 - 5 μm
Reflectance over Coating Range (Avg.)
<2.0%
Surface Quality
40-20 Scratch-Dig

 
Thorlabs' Ø1/2" and Ø1" Calcium Fluoride (CaF2) Positive Meniscus Lenses, which offer high transmission from 0.18 - 8.0 μm, are available with a broadband AR coating optimized for the 3 - 5 μm spectral range deposited on both surfaces. This coating greatly reduces the surface reflectivity of the substrate, yielding an average transmission in excess of 96.8% over the entire AR coating range. See the Graphs tab for detailed information.
CaF2 is commonly used for applications requiring high transmission in the infrared and ultraviolet spectral ranges. Its extremely high laser damage threshold makes it useful for use with excimer lasers. The material exhibits a low refractive index, varying from 1.35 to 1.51 within its usage range of 180 nm to 8.0 μm. Calcium fluoride is also fairly chemically inert and offers superior hardness compared to its barium fluoride, magnesium fluoride, and lithium fluoride cousins.
Positive meniscus (convex-concave) lenses, which are thicker in the middle than at the edges and cause light rays to converge, are designed to minimize third-order spherical aberration. They are often used in conjunction with other lenses to decrease the focal length, and therefore increase the numerical aperture (NA), of an optical assembly. Since a positive meniscus lens has a greater radius of curvature on the concave side of the lens than on the convex side, real images can be formed.
 
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