Physical and Chemical Properties
Crystal symmetry	Tetragonal
Density, g/cm3	3.95
Melting Point	825°C
Mohs hardness	4 - 5
Lattice constant, A	a = 5.26, c = 10.94
Refractive index, at 1.053 μm	no= 1.448; ne= 1.47
Transmission band, μm	0.1 - 7.5
Thermal conductivity, W x cm-1 x °K-1	0.06
Thermal expansion ( a ), 10-6 x °C-1	13 along a,   8 along c
Thermooptical factor (dn/dT), at 1.06 μm	π = 4.3 x 10-6 x °K-1, σ = 2.0 x 10-6x °K-1
Non-linear index n2 , esu	0.6 x 10-13
Stimulated emission cross-section, cm2	3.0 x 10-19
Generated wavelength, μm	π = 1.047, σ = 1.053
Laser Properties
Laser Transition	4F3/2 → 4I11/2
Laser Wavelength	1047nm, 1053nm
Fluorescence Lifetime	485μs
Emission Cross Section	1.8×10-19cm2(E ∥ C) @1047nm
	1.2×10-19cm2(E ⊥ C) @1053nm
Spectral Properties
Index of Refraction	no =1.443       ne =1.464 @ 633nm
	no =1.448      ne =1.470  @1064nm
Optical losses at 1.053 μm, cm-1	< 0.003

  Standard specifications

Dopant concentration, at.%	1.1±0.1%
orientation:	<100>within 5° <001>within 5°
Flatness	< λ/8 @632.8nm
Parallelism	≤ 10"
Perpendicularity	≤ 5 ′
Roughness, scratch/dig	10/5(MIL-O-13830A)
AR Coating Reflectivity	≤ 0.2% (@1047/1053nm)

                                                                                                                     ORDER