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UV熔二氧化硅290-370nm增透半月正透镜
UV Fused Silica Positive Meniscus Lenses, UV AR-Coated
商品货号:ECS002498
商品品牌:Thorlabs
详细介绍
Features
  • Choose from Ø1" or Ø2" Versions
  • UV AR Coating for the 290 - 370 nm Range
  • Focal Lengths Available from 100.0 - 1000.0 mm
  • Fabricated from UV Grade Fused Silica
  • Spherical Surface Power: 3 Fringes
  • Spherical Surface Irregularity: λ/4
Thorlabs' UV Grade Fused Silica Positive Meniscus Lenses are available either or with a UV antireflection coating for the 290 - 370 nm range deposited on both surfaces. Compared to BK7, UV-grade fused silica offers high transmission deeper into the UV (down to 185 nm), better homogeneity, and a lower coefficient of thermal expansion. In addition, UV-grade fused silica has extremely low fluorescence levels when compared to natural quartz.
The additional UV antireflection coating on these positive meniscus lenses is particularly desirable for applications with multiple optical elements. Since approximately 4% of the incident light is reflected at each surface of an uncoated substrate, the application of a UV AR coating improves transmission, which is particularly important in low-light applications, and prevents the undesirable effects (e.g., ghost images) associated with multiple reflections.
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. These types of lenses are commonly used in the ophthalmic industry since convention dictates that lens power be specified in Diopters. 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.
Thorlabs offers their negative meniscus lenses in Ø1 and Ø2" versions. Each size is compatible with a multitude of Thorlabs lens mounts. Please see the Mounting Options tab for details.
 
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