crystaltechno : crystal optics manufacturer


MATERIAL	BASE PROPERTIES	REFRACTIVE INDEX	PRODUCTS AVAILABLE

Gallium Arsenide (GaAs)

Gallium Arsenide used for lenses and beam splitters provides an alternative to ZnSe in medium and high power CW CO₂ laser systems. It is most useful in applications where toughness and durability are important. Its hardness and strength make it a good choice where dust or abrasive particles tend to build up on or bombard the optical surfaces. When frequent cleaning by wiping is required, GaAs is excellent. The material is nonhygroscopic, safe to use in laboratory and field conditions and is chemically stable except when in contact with strong acids.


MATERIAL	BASE PROPERTIES	REFRACTIVE INDEX	PRODUCTS AVAILABLE




	PARAMETER	VALUE

	Molecular Weight	144.63
	Density, g/cm³ at 300 K	5.32
	Index of Absorption, 1/cm at 10.6 µm	<0.02
	Useful Transmission Range, µm	1-11
	Reflection Losses, % for 2 surfaces at 12 µm	43.8
	Dielectric Constant at 300 K, high frequency	10.88
	Dielectric Constant at 300 K, static	12.85
	Melting Point, K	1511
	Thermal Conductivity, W/(m K) at 300 K	55
	Thermal Expansion, 1/K at 300 K	5.7 x 10^-6
	Specific Heat, cal/(g K) at 273 K	0.076
	Debye Temperature, K	360
	Knoop Hardness, kg/mm²	731
	Young's Modulus, GPa	82.68
	Bulk Modulus, GPa	75.5
	Poisson Ratio	0.31
	Bandgap, eV	1.4
	Solubility in water	None


MATERIAL	BASE PROPERTIES	REFRACTIVE INDEX	PRODUCTS AVAILABLE


MATERIAL	BASE PROPERTIES	REFRACTIVE INDEX	PRODUCTS AVAILABLE

Wavelength, µm	8.0	10.0	11.0	13.0	13.7	14.5	15.0	17.0	19.0	21.9
Refractive Index	3.34	3.13	3.04	2.97	2.89	2.82	2.73	2.59	2.41	2.12


MATERIAL	BASE PROPERTIES	REFRACTIVE INDEX	PRODUCTS AVAILABLE

The following products from GaAs are available:

WINDOWS

BLANKS