Sunny Precision Optics
can provide raw calcite crystal and are extracted from the deposit to meet
U.S. Military specifications MIL-G-174B. change, we can provide colorless
calcite using our unique techniques in color , which has 15~20% transmission
improvement from yellow calcite at short wavelength. We may supply raw calcite
size. Calcite is a natural crystal that has high birefringence and wide spectral
transmission and available on a variety of size from 10mm to 80mm rhombs.
It is a negative uniaxial crystals and commonly used as UV, visible and near
IR polarizers. We can provide quality Raw calcite, semi-finished product and
Polarizer product.
Spectral Properties,
Wavefront Distortion (Striae), Scatter are main reasons to affect calcite's
quality.
Physical and optical
properties
Transparency Range |
300-2300nm |
Crystal Structure |
Rhombihedral |
Density |
2.7g/cm3 |
Crystal Class |
Negative uniaxial with no=na=nb, ne=nc |
hardness |
3 Mohs |
Refractive index, birefringence(¦¤=ne-no)
|
no =1.6557, ne=1.4852 ¦¤n=-0.1705, ¦Ñ= 6.20¡ã@ 630nm
|
no =1.6629, ne =1.4885 ¦¤n=-0.1705, ¦Ñ= 6.20¡ã@ 1300nm |
Sellmeier equation |
no2=2.69705+0.0192064/(¦Ë2-0.01820)-0.0151624¦Ë2 ne2=2.18438+0.0087309/(¦Ë2-0.01018)-0.0024411¦Ë2 |
Standard Semi_finished
Calcite Dimension
<20x20x20 mm |
>20x20x20 mm |
>30x30x30 mm |
>40x40x40 mm |
>50x50x50 mm |
>60x60x50 mm |
Specification (finished
product)
Dimension |
Max: 60 x 60 x 50mm |
Surface Quality |
40/20 Scratch and dig |
Flatness |
¦Ë/4 @ 632.8 nm |
Transmission wavefront distortion |
¦Ë/2 @632.8 nm |
Coating |
Upon request |