crystaltechno : crystal optics manufacturer


MATERIAL	BASE PROPERTIES	REFRACTIVE INDEX	PRODUCTS AVAILABLE

Calcium Fluoride (CaF₂)

Calcium Fluoride is used for optical windows, lenses and prisms in the 0.15 µm - 9 µm range.
This material has found wide use in high power laser optics due to its low absorption. Polished surfaces are stable and will last several years under normal conditions. Due to its low refractive index, Calcium Fluoride can be used without anti-reflection coating.
Calcium fluoride is grown by vacuum Stockbarger technique. Material for IR use is grown using naturally mined fluorite, in large quantities at relatively low cost.

Maximum available size: 380 mm
Dia x 70 mm Thk


MATERIAL	BASE PROPERTIES	REFRACTIVE INDEX	PRODUCTS AVAILABLE




	PARAMETER	VALUE

OPTICAL
	Transmission Range	0.13 to 10 microns
	Refractive Index	1.39908 at 5 microns
	Reflection Loss	5.5% at 5 µm (2 surfaces)
	Restrahlen Peak	35 microns
	dN/dT	-10.6 x 10^-6/°C
PHYSICAL
	Density	3.18 g/cm³
	Melting Point	1360 °C
	Thermal Conductivity	9.71 W/(m*K)
	Thermal Expansion	18.85 x 10^-6/°C
	Hardness	Knoop 158.3 kg/mm² (100)
	Specific Heat Capacity	854J/(kg K)
	Dielectric Constant	6.76 at 1MHz
	Young's Modulus (E)	75.8 GPa
	Shear Modulus (G)	33.77 GPa
	Bulk Modulus (K)	82.71 GPa
	Elastic Coefficients	C11=164 MPa, C12=53 MPa, C44=33.7 MPa
	Apparent Elastic Limit	36.54 MPa
	Poisson Ratio	0.26
CHEMICAL
	Solubility	0.0017g/100g water at 20 °C
	Molecular Weight	78.08
	Class/Structure	Cubic (111) cleavage


MATERIAL	BASE PROPERTIES	REFRACTIVE INDEX	PRODUCTS AVAILABLE


MATERIAL	BASE PROPERTIES	REFRACTIVE INDEX	PRODUCTS AVAILABLE

Wavelength, µm	0.19	0.21	0.25	0.33	0.41	0.88
Refractive Index	1.51	1.49	1.47	1.45	1.44	1.43

Wavelength, µm	2.65	3.90	5.00	6.20	7.00	8.22
Refractive Index	1.42	1.41	1.40	1.38	1.36	1.34


MATERIAL	BASE PROPERTIES	REFRACTIVE INDEX	PRODUCTS AVAILABLE

The following products from CaF₂ are available:

  WINDOWS

  BLANKS

  LENSES
(spherical pl-cvx, spherical bi-cvx, cylindrical pl-cvx)