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
Request custom
- 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 | |
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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
590 €
3x3 mm
8 mm
Brewster cut
3%
uncoated
7817
540 €
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