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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.
Red Optronics supplies a wide variety finished Calcite crystals. Our standard
Calcite crystals specification follows:
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Main Specifications
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| 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 |
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Note:
To inquire or order
a finished Calcite crystal, please provide detailed specifications as listed
in above.
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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 |
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