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Concentration Tolerance (atm%)2-4 at.%
Lattice Constants4~5
Orientationa-cut, other orientations also available
Surface Quality10-5 scratch & dig
Wavefront Distortionλ/8 @ 633nm
Surface Flatnessλ/10 @ 633nm
Clear Aperture95%
Length Tolerance±0.1 mm
Face Dimensions Tolerance+0/-0,1 mm
Protective Chamfers<0,1 mm at 45˚
Damage Thresholdover 15J/cm2 TEM00, 10ns, 10Hz
Crystal StructureTetragonal
Lattice Constantsa=5.16Å; c=10.85Å
Density3.99 g/cm³
Melting Point819℃
Thermal Conductivity6 Wm-1K-1
Thermal Optical Coefficient(dn/dT)π = 4.3 x 10-6 x °K-1; σ = 2.0 x 10-6 x °K-1
Thermal Expansion /(10-6·K-1@25°C )10.1×10-6 (//c) K-1,  14.3×10-6((//a)  K-1
Hardness (Mohs)5
Shear Modulus /Gpa85
Specific Heat0.79 J/gK
Poisson Ratio0.3
Laser Transition3F43H6
Laser Wavelengthπ:1880 nm; σ:1908 nm
Absorption Cross-section at Peak0.55×10-20 cm2
Absorption Bandwidth at Peak Wavelength16 nm
Absorption Peak Wavelength792 nm
Lifetime of 3F4 Thulium Energy Level16 ms
Quantum Efficiency2
Non-linear Index n20.6 x 10-13
Optical Quality< 0.3 x 10-5
Refractive Index @1064 nmno=1.448, ne=1.470
Laser Induced Damage Threshold>10 J/cm2@1900 nm, 10 ns
CoatingsR<0,5% @792 nm + R<0,15% @1800-1960 nm on both sides; custom coatings also available

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