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UV熔二氧化硅无镀膜平凸透镜
UV Fused Silica Plano-Concave Lenses, Uncoated
商品货号:ECS002486
商品品牌:Thorlabs
详细介绍
Features
  • 4 Different Diameters Available: Ø6 mm, Ø8 mm, Ø1/2", and Ø1"
  • Wavelength Range: 185 nm - 2.1 μm (Uncoated)
  • Focal Lengths Available from -10.0 to -200.0 mm
  • Fabricated from UV Grade Fused Silica
  • Form Virtual Images
Thorlabs' UV Grade Fused Silica Plano-Concave lenses are available either uncoated or with a for the 290 - 370 nm range deposited on both surfaces. UV-grade fused silica offers high transmission in the deep UV and extremely low fluorescence levels compared to natural quartz, making it an ideal choice for applications from the UV to the near IR. In addition, UV fused silica has better homogeneity and a lower coefficient of thermal expansion than N-BK7.
Plano-concave lenses have negative focal lengths, making them useful for a wide range of applications. They are commonly used to diverge a collimated incident beam; in such cases the collimated light source should be incident on the curved surface to minimize spherical aberrations. Plano-concave lenses, which produce virtual images, are used as the entrance optic in Galilean-type beam expanders; this lens provides the desired divergence and then a doublet is used to recollimate the beam. In optical systems, it is common for researchers to choose their optics carefully so that the aberrations introduced by the positive- and negative-focal-length lenses approximately cancel. Still others use these lenses in pairs to increase the effective focal length of a converging lens.
When deciding between a plano-concave lens and a bi-concave lens, both of which cause collimated incident light to diverge, it is usually preferrable to choose a plano-concave lens if the desired absolute magnification is either less than 0.2 or greater than 5. Between these two values, are generally preferred.
Thorlabs offers these plano-concave lenses in sizes ranging from Ø6 mm to Ø1". Each size is compatible with a multitude of Thorlabs lens mounts. Please see the Mounting Options tab for details.
 
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