Yb:KGW crystals
Main features
- Large gain bandwidth
- High emission cross-sections
- Small quantum defect
- High doping level
- High thermal conductivity
- Custom crystals available upon request
Application examples
- Femtosecond lasers and regenerative amplifiers
- CW and passively mode-locked thin-disk lasers
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- Description
- Properties
- Absorption and emission curves
- Standard specifications
- Downloads
Yb3+:KGW crystals possess a large gain bandwidth that enables them to obtain <100 fs pulse duration in the mode-locked regime of operation. Compared with other ytterbium-doped gain media with a similarly large gain bandwidth, ytterbium-doped tungstate has fairly high emission cross-sections. The ytterbium doping concentration in Yb:KGW crystals can be up to 5 at. % without a significant quenching. Thermal conductivity of common double tungstates is in the range of 3–4 Wm-1K-1. Yb:KGW crystals exhibit a small quantum defect and it is possible to operate with a quantum defect well below ~4-5%.
| Spectroscopic and thermo-mechanical properties | |
|---|---|
| Absorption peak wavelength | 980 nm |
| Absorption cross-section at peak wavelength | 12 × 10-20 cm2 (E || Nm) |
| Absorption bandwidth at peak wavelength | 3,7 nm |
| Laser wavelength | 1025 (1020-1060) nm |
| Lifetime of 2F5/2 ytterbium energy level | 240 μs |
| Emission cross-section at 1030 nm | 3 × 10-20 cm2 (E || Nm) |
| Refractive index at 1064 nm | ng= 2,037 np= 1,986 nm= 2,033 |
| Crystal structure | Monoclinic |
| Density | 7,25 g/cm3 |
| Mohs hardness | 4-5 |
| Thermal conductivity | Ka= 2,6 Wm-1 K-1 Kb= 3,8 Wm-1 K-1 Kc= 3,4 Wm-1 K-1 |
| dn/dT | dnp/dT = -15,7 × 10-6 K-1 dnm/dT = -11,8 × 10-6 K-1 dng/dT = -17,3 × 10-6 K-1 |
| Thermal expansion coefficient | αp = 1,7 × 10-6 K-1 αm = 11,01 × 10-6 K-1 αg = 17,37 × 10-6 K-1 |
| Typical doping level, at. % | 1-5 at. % |
| Yb:KGW crystals | |
|---|---|
| Orientation | Ng-cut; Np(b)-cut and other orientation available |
| 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%)@970-1070 nm |
| Laser-induced damage threshold | >10 J/cm2@1040 nm, 10 ns |
| Mount | Unmounted |
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Face dimensions
Length
End faces
Doping
Coatings
SKU
PRICE
QUANTITY
3x3 mm
10 mm
Right-angle cut
1%
AR/AR@970-1070 nm
7049
Request
5x5 mm
10 mm
Right-angle cut
1%
AR/AR@970-1070 nm
7050
Request
3x3 mm
10 mm
Brewster-angle cut
1%
uncoated
7051
Request
5x5 mm
10 mm
Brewster-angle cut
1%
uncoated
7052
Request
3x3 mm
5 mm
Right-angle cut
2%
AR/AR@970-1070 nm
7053
Request
5x5 mm
5 mm
Right-angle cut
2%
AR/AR@970-1070 nm
7054
Request
3x3 mm
5 mm
Brewster-angle cut
2%
uncoated
7055
Request
5x5 mm
5 mm
Brewster-angle cut
2%
uncoated
7056
Request
3x3 mm
3 mm
Right-angle cut
3%
AR/AR@970-1070 nm
7057
Request
5x5 mm
3 mm
Right angle cut
3%
AR/AR@970-1070 nm
7058
Request
3x3 mm
3 mm
Brewster-angle cut
3%
uncoated
7059
Request
5x5 mm
3 mm
Brewster-angle cut
3%
uncoated
7060
Request
3x3 mm
2 mm
Right-angle cut
5%
AR/AR@970-1070 nm
7061
Request
5x5 mm
2 mm
Right-angle cut
5%
AR/AR@970-1070 nm
7062
Request
3x3 mm
2 mm
Brewster-angle cut
5%
uncoated
7063
Request
5x5 mm
2 mm
Brewster-angle cut
5%
uncoated
7064
Request
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