Tm:YLF crystals
Main features
- Strong absorption bands for laser diode pumping
- Weak thermal lensing
- High polarization purity
- Custom crystals available upon request
Application examples
- LIDAR systems for remote sensing applications
- Pump source for Ho3+:YAG lasers
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- Description
- Properties
- Absorption and emission curves
- Standard specifications
Tm3+:YLF crystal features high absorption peaks conveniently located for diode pumping around 792 nm and exhibits a cross-relaxation process, which creates two ions in the upper laser level for each pump photon absorbed. Tm3+:YLF lasers are ideal pump sources for Ho3+:YAG lasers. This is due to a good overlap of Tm3+:YLF emission and Ho3+:YAG absorption spectra and the capacity of producing linearly polarized output. What is more, the refractive index of Tm3+:YLF decreases with temperature, leading to a negative thermal lens that is partly compensated by a positive lens effect due to end face bulging.
| Spectroscopic and thermo-mechanical properties | |
|---|---|
| Absorption peak wavelength | 792 nm |
| Absorption cross-section at peak | 0,55 × 10-20 cm2 |
| Absorption bandwidth at a peak wavelength | 16 nm |
| Laser wavelength | 1900 nm |
| Lifetime of 3F4 thulium energy level | 16 ms |
| Emission cross-section @1900 nm | 0,4 × 10-20 cm2 |
| Refractive index @1064 nm | no=1,448, ne=1,470 |
| Crystal structure | Tetragonal |
| Density | 3,95 g/cm3 |
| Mohs’ hardness | 5 |
| Thermal conductivity | 6 Wm-1K-1 |
| dn/dT | -4,6 × 10-6 (//c) K-1, -6,6 × 10-6 (//a) K-1 |
| Thermal expansion coefficient | 10,1 × 10-6 (//c) K-1, 14,3 × 10-6 (//a) K-1 |
| Typical doping level | 2-4 at.% |
| Tm:YLF crystals | |
|---|---|
| Orientation | a-cut |
| Clear aperture | >90% |
| Face dimensions tolerance | +0,0/-0,1 mm |
| Length tolerance | ±0,1 mm |
| Parallelism error | <10 arcsec |
| Perpendicularity error | <10 arcmin |
| Protective chamfers | <0,1 mm at 45˚ |
| Surface quality | 10-5 S-D |
| Surface flatness | <λ/10@632,8 nm |
| Coatings | AR(R<0,5%)@792 nm + AR(R<0,5%)@1800-1960 nm on both faces |
| Laser-induced damage threshold | >10 J/cm2@1900 nm, 10 ns |
| Mount | Unmounted |
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Face dimensions
Length
End faces
Doping
Coatings
SKU
PRICE
QUANTITY
3x3 mm
8 mm
Right-angle cut
3%
AR/AR@792 nm+ 1800-1960 nm
7816
Request
3x3 mm
8 mm
Brewster cut
3%
uncoated
7817
Request
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