Tm:YLF
Two-micrometer Tm³⁺ lasers are widely used in science, defense and medicine. Thulium can readily substitute into many crystal hosts suitable for high-average-power laser systems, with an absorption band near 0.8μm that permits excitation by commercial high-power laser diodes. Thulium-doped lithium yttrium fluoride has a low nonlinear refractive index and thermo-optic constant, making it well suited to optoelectronic applications in research, production and education. It is a negative uniaxial crystal with a negative temperature coefficient of refractive index, which can counteract thermal distortion and yield high beam quality. Pumping is at 792nm, and linearly polarized laser emission at 1900nm emerges along the axis. Light emitted along the c axis is nonlinearly polarized. Appropriate crystal size and doping concentration enable high-power laser output.
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Overview
Specifications
| Parameter | Value |
|---|---|
| Concentration tolerance | 2-4 at.% |
| Orientation | a-cut; other orientations also available |
| Parallelism | <10” |
| Perpendicularity | <5” |
| Surface Quality | 10⁻⁵ scratch & dig |
| Wavefront distortion [@633nm] | λ/8 @ 633nm |
| Surface Flatness [@633nm] | λ/10 @ 633nm |
| Clear Aperture Dimension | 95% |
| Length Tolerance | ±0.1 mm |
| Face dimension tolerance | +0/-0,1 mm |
| Protective chamfer | <0,1 mm at 45˚ |
| Damage Threshold | over 15J/cm2 TEM00, 10ns, 10Hz |
| Crystal Structure | Tetragonal crystal system |
| Lattice constant | a=5.16Å; c=10.85Å |
| Density | 3.99 g/cm³ |
| Melting point | 819℃ |
| Thermal conductivity | 6 Wm⁻¹K⁻¹ |
| Thermo-optic coefficient dn / dT | π = 4.3 x 10⁻⁶ x °K⁻¹; σ = 2.0 x 10⁻⁶ x °K⁻¹ |
| Thermal expansion rate [@ 25°C] | 10.1×10-6 (//c) K⁻¹, 14.3×10-6((//a) K⁻¹ |
| Hardness | 5 Mohs |
| Shear modulus | 85 Gpa |
| Specific heat | 0.79 J/gK |
| Poisson's ratio | 0.3 |
| Laser transition | ³F₄→³H₆ |
| Laser Wavelength | π:1880 nm; σ:1908 nm |
| Absorption bandwidth at peak wavelength | 16 nm |
| Absorption peak wavelength | 792 nm |
| ³F₄ Thulium energy-level lifetime | 16 ms |
| Quantum Efficiency | 2 |
| Nonlinear index n₂ | 0.6 x 10⁻¹³ |
| Optical quality | < 0.3 x 10-5 |
| Refractive Index [@1064 nm] | nₒ=1.448, nₑ=1.470 |
| Laser-induced damage threshold [@1900 nm, 10 ns] | >10 J/cm²@1900 nm, 10 ns |
| Coating [@792 nm + R<0,15% @1800-1960 nm; @792 nm + R<0,15% @1800-1960 nm; custom coatings also available] | R<0,5% on both sides @792 nm + R<0,15% @1800-1960 nm; custom coatings also available |
Applications
Key Features
Datasheet
Supplier Information
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