Er:YAG

Advantage:

   Very high slope efficiency

   Operates well at room temperature

   Operate in a relatively eye-safe wavelength range

Basic Properties:
Crystal Structure  Cubic 
Lattice Parameters  12.01 Å 
Melting Point  1970 C 
Moh Hardness  8.5
Density  4.560.04g/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)  7.310 -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  6.7510 -20 J(@2940nm) 
Emission Cross Section  310 -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.

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