常用作聚焦鏡的紅外平凸鏡,材料包括BaF2,CaF2,Si,Ge,Al2O3,ZnSe以及其他各種材料。此材料為Al2O3.
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 5.0 microns
Focal Length Tolerance ±2%
Surface Quality 60/40
Clear Aperture 90% Central Diameter
Wedge Angle < 3 arc min
