Used with the concave(平凹鏡) side facing the longer conjugate, these lenses act as a beam-expanding element in large f-number systems.
產(chǎn)品指標(biāo)如下:
Diameter tolerance +0,-0.005” (+0,-0.13 mm)
Center Thickness tolerance ±0.008” (±0.2 mm)
Design Wavelength 5 microns
Focal Length Tolerance ±2%
Surface Quality 60/40
Clear Aperture 90% Central Diameter
Wedge Angle < 3 arc min
Surface Irregularity 1/2 l at 633 nm
![](https://img72.ybzhan.cn/73c1482f3b90472ae171a2d5fae1fb41724ba86d7dff1ff17b80ce8754e5e21e1baf8c78497bf65b.jpg)