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Crystals >>> Laser Crystals >>>  Ho:Cr:Tm:YAG

Ho:Cr:Tm:YAG is a high efficiency laser material which lasers at 2.1μm. It has wide applications in medical military and meteorology fields.

Main Specifications

Dopant concentration Ho:0.35 at%, Tm:5.8 at%,Cr:~1.5at%
Orientation [111] within 5�
Wavefront Distortion ≤ 0.125λ/inch(@1064nm)
Extinction Ratio ≥25 dB
Rod Sizes Diameter:36mm,Length:50120mm 
Upon request of customer
Dimensional Tolerances Diameter:+0.00/-0.05mm,
Length: � 0.5mm
Barrel Finish Ground Finish: 400# Grit
Parallelism ≤30"
Perpendicularity ≤5′
Flatness  λ/10
Surface Quality 10-5
Chamfer 0.006"�0.002" at 45�� 5�
AR Coating Reflectivity  ≤ 0.25% (@2094nm)


Physical and Optical Properties

Crystal Structure Cubic
Lattice Parameters 12.01 �
Melting Point 1970�C
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 3.17�104Kg/mm2
Poisson Ratio 0.3(est.)
Tensile Strength 0.13~0.26GPa
Thermal Expansion Coefficient [100]Direction:8.2�10-6/�C(0~250�C)
Thermal Conductivity 14W/m/K(@20�C)
Thermal Optical Coefficient (dn/dT) 7.3�10-6/�C
Thermal Shock Resistance 790W/m
Solubility Water: Insoluble;
Common Acids: Slightly


Optical and Spectral Properties

Laser Transition 5I7 - 5I8
Laser Wavelength  2.097 μm 
Photon Energy 9.55 x 10-20 J
Emission Cross Section  7 x 10-21 cm2
Fluorescence Lifetime 8.5 ms
Index of Refraction 
Absorption Linewidth 
Diode Pump Band 
Major Pump Bands
1.80 @2.08 μm
4 nm
781 nm
400~800 nm


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