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塑料非球面镜片
Plastic Aspheric Lenses
商品货号:ECS002525
商品品牌:Thorlabs
详细介绍
Features
  • Material: Optical Grade Plastic
  • Near Diffraction Limited Performance
  • Very Low Cost
In laser diode systems, difficulties with aberration correction are compounded by the beam's high divergence angle. Since individual spherical lenses can refract light at only small angles before spherical aberration is introduced, three or four elements are often required to collimate laser diode light. In contrast, a single aspheric lens collimates without introducing spherical aberration. When used to collimate light, the lens should be oriented so that the side with a larger radius of curvature faces the point source.
Conversely, when coupling into fiber, it is often necessary to focus the laser light to a diffraction limited spot. Single spherical elements are typically not capable of achieving such a small spot size. Spherical aberration is the limiting factor rather than the diffraction limit. Because the aspheric lenses are corrected to eliminate the spherical aberration, only diffraction limits the size of the focal spot. For focusing applications, the lens should be oriented so that the side with less curvature faces the source.
Some of the aspheric lens models are corrected for the presence of a window in front of the diode laser, like the window in TO type laser packages. Please see the Specs tab for details.
 
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