Crystals >>> Laser Crystals >>>  Er:YAG

Er:YAG is an excellent laser crystal which lasers at 2.94mm.  It has wide applications in medical laser systems and others.

Advantages of Er:YAG Crystals:

  • High slope efficiency

  • Operate well at room temperature

  • Operate in a relatively eye-safe wavelength range

Main Specifications  
Dopant concentration Er: ~50 at%
Orientation [111] within 5
Wavefront Distortion ≤0.125λ/inch(@1064nm)
Extinction Ratio ≥25 dB
Rod Sizes Diameter: 36mm, Length:50120 mm 
Upon request of customer
Dimensional Tolerances Diameter:+0.000"/-0.002", 
Length: 0.02" 
Barrel Finish Ground Finish: 400# Grit
Parallelism ≤10"
Perpendicularity ≤5′
Flatness λ/10
Surface Quality 10-5(MIL-O-13830A)
Chamfer 0.006"0.002" at 45 5
AR Coating Reflectivity ≤ 0.25% (@2940nm)


Optical and Spectral Properties  
Laser Transition 4I11/2 to 4I13/2
Laser Wavelength 2940nm
Photon Energy 6.7510-20J(@2940nm)
Emission Cross Section 310-20 cm2
Index of Refraction 1.79 @2940nm
Pump Bands 600~800 nm
Physical and Optical properties
Lattice Parameters 12.01 
Melting Point 1970C
Moh Hardness 8.5
Density 4.56 0.04g/cm3
Specific Heat (0-20) 0.59J/g.cm3
Modulus of Elasticity 310GPa
Young's Modulus 3.17104Kg/mm2
Poisson Ratio 0.3(est.)
Tensile Strength 0.13~0.26GPa
Thermal Expansion Coefficient [100] Direction:8.210-6/
[110] Direction:7.710-6/
[111] Direction:7.810-6/
Thermal Conductivity 14W/m/K(@20C)
Thermal Optical Coefficient (dn/dT) 7.310-6/C
Thermal Shock Resistance 790W/m
Solubility Water: Insoluble;
Common Acids: Slightly




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