Er:YAG

Basic Properties:
Crystal Structure	Cubic
Lattice Parameters	12.01 Å
Melting Point	1970 °C
Moh Hardness	8.5
Density	4.56±0.04g/cm 3
Specific Heat (0-20)	0.59J/g.cm 3
Modulus of Elasticity	310GPa
Young's Modulus	3.17X10 4 Kg/mm 2
Poisson Ratio	0.3(est.)
Tensile Strength	0.13~0.26GPa
Thermal Expansion Coefficient	[100]Direction:8.2x10 -6 / °C (0~250 °C )
	[110]Direction:7.7x10 -6 / °C (0~250 °C )
	[111]Direction:7.8x10 -6 / °C (0~250 °C )
Thermal Conductivity	14W/m/K(@20 °C )
	10.5W/m/K(@100 °C )
Thermal Optical Coefficient (dn/dT)	7.3×10 -6 / °C
Thermal Shock Resistance	790W/m

Optical and Spectral Properties:
Dopant concentration	Er: ~50 at%
Laser Transition Transition	4 I 11/2 to 4 I 13/2 to 4 I 13/2
Laser Wavelength	2940nm
Photon Energy	6.75×10 -20 J(@2940nm)
Emission Cross Section	3×10 -20 cm 2
Index of Refraction	1.79 @2940nm
Pump Bands	600~800 nm

Specifications:
Orientation:	<111> or <100]> crystalline within 5°
Wavefront distortion :	?/8 per inch @ 633 nm
Extinction Ratio:	>25dB
Dimension Tolerances	Rods with diameter: ±0.025 mm , Length: ±0.5 mm
Surface quality:	10/5 Scratch / Digper MIL-O-1380A
Parallelism:	< 10 arc seconds
Perpendicularity:	< 5 arc minutes
Flatness:	<?/10 @ 633 nm
chamfer:	<0.1 mm @ 45deg.
Barrel Finish:	ground or polished
AR Coating Reflectivity	R< 0.25%

Other specifications are available as the requirements of customers.