Laser Materials CTH:YAG

cth:yag laser materials

General Information

Triple doped Cr3+,Tm3+, Ho3+:YAG is an efficient solid-state laser medium for 2097nm generation, widely used in military, medicine, and remote sensing applications. High spectral overlap of pump radiation (lamp or diode) with the Cr3+ and Tm3+ absorption bands, and a highly efficient conversion from the absorption bands into the 5I7 -> 5I8 Ho3+ emission band, enables 2 micron laser architectures with high quantum efficiency. [1], [2]

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Dopant Ion

Cr3+ Concentration 0.85%
Tm3+ Concentration 5.9%
Ho3+ Concentration 0.36%

Common Operating Specs

Emission Wavelength 2.080 μm
Laser Transition 5I75I8
Flouresence Lifetime 8.5 ms
Pump Wavelength flash lamp or diode pumped @ 780nm

Physical Properties

Coefficient of Thermal Expansion 6.14 x 10-6 K-1
Thermal Diffusivity 0.041 cm2 s-2
Thermal Conductivity 11.2 W m-1 K-1
Specific Heat (Cp) 0.59 J g-1 K-1
Thermal Shock Resistant 800 W m-1
Refractive Index @ 632.8 nm 1.83
dn/dT (Thermal Coefficient of Refractive Index) @ 1064nm 7.8 10-6 K-1
Molecular Weight 593.7 g mol-1
Melting Point 1965°C
Density 4.56 g cm-3
MOHS Hardness 8.25
Young’s Modulus 335 Gpa
Tensile Strength 2 Gpa
Crystal Structure Cubic
Standard Orientation <111>
Y3+ Site Symmetry D2
Lattice Constant a=12.013 Å


1) CTH:YAG was initially suggested by, B. M. Antipenko, et. al. , Zh. Tekh. Fiz. Pis'ma, 11, 682 (1985)

2) An overview of the cross relaxation energetics is given by, A. A. Kaminskii, "Crystalline Lasers: Physcial Processes and Operating Schemes", CRC Press, New York, (1996), ISBN 0-8493-3720-8. Chapter 8.2.

Absorption Coefficient Chart

passive q-switch

Data Sheet Downloads