Calcite is
a natural crystal that has high birefringence and wide spectral transmission
and available in reasonably sized rhombs. It is a negative uniaxial
crystals and commonly used as visible and near IR polarizers.
New Rise Optics supplies a wide variety finished Calcite crystals. Our standard
Calcite crystals specification follows:
Main Specifications
|
|
Diameter |
max
30~40mm |
Length |
max
25~35mm |
Surface
quality |
20/10
scratch/dig |
Beam
deviation |
< 3 arc
min |
Optical
axis orientation |
+/-0.5� |
Flatness |
λ/4 @632.8nm |
Transmission wavefront
distortion |
<λ/2
@632.8nm |
|
Note: To inquire or order
a finished Calcite crystal, please provide detailed specifications as listed
in above.
Physical and
Optical Properties
|
|
Transparency range |
350~2300nm |
Partical
shape |
Crystalline
rhombihedral |
Density |
2.7
g/cm3 |
Hygroscopic
susceptibility |
Low
susceptibility to moisture |
Hardness |
3 Mohs |
Thermal
expansion coefficient |
αa=24.39x10-6/k;
αc=5.68x10-6/k |
Crystal
class |
Negative
uniaxial with no=na=nb, ne=nc |
Refractive
index, birefringence(Δ=ne-no) and walk-off angle at 45�C(ρ) |
no =1.6557,
ne=1.4852 Δn=-0.1705, ρ= 6.20� @ 630nm |
no =1.6629,
ne =1.4885 Δn=-0.1705, ρ= 6.20� @
1300nm |
Sellmeier equation |
no2=2.69705+0.0192064/(λ2-0.01820)-0.0151624λ2 ne2=2.18438+0.0087309/(λ2-0.01018)-0.0024411λ2 |
|
|