Structural and Physical Properties
Crystal Structure	Trigonal, space group R3c
Cell Parameters	A = b = 12.532 Å
	C = 12.717 Å
	Z = 6
Melting Point	1095 ± 5°C
Transsition temperature	925 ± 5°C
Optical homogeneity	?ddn ? 10-6 /cm
Mohs Hardness	4
Density	3.85 g/cm3
Absorption Coefficient	< 0.1 %/cm ( at 1064 nm )
Specific hea:	1.91 J/cm3 x K
Hygrocopic susceptibility	Low
Thermal expansion Coefficients.	a, 4 x 10-6 /K c, 36 x 10-6 /K
Thermal Conductivity	^c, 1.2 W/m/K; //c, 1.6 W/m/K
Linear Optical Properties
Transparency range	189 - 3500 nm
Refractive indices	at 1064 nm	ne = 1.5425	no = 1.6551
at 532 nm	ne = 1.5555	no = 1.6749
at 266 nm	ne = 1.6146	no = 1.7571
Therm - optic Coefficients.	dno / dt = -9.3 x 10-6 /°C
	dne / dt = -16.6 x 10-6 /°C
Nonlinear Optical Properties
Phase - matchable output Wavelenghts	189 - 1750 nm
NLO Coefficients	d11 = 5.8 x d36 (KDP)
	d31 = 0.05 x d11
	d22 = 0.05 x d11
Electro - Optic Coefficients	???11 = 2.7 pm/V, ???22, ???31 <0.1 ???11
Half - wave voltage	48 KV (at 1064 nm)
Damage threshold	at 1064 nm	5 GW / cm2 (10 ns)	10 GW / cm2 (1.3 ns)
at 532 nm	1 GW / cm2 (10 ns)	7 GW / cm2 (250 ns)
List of optical crystals