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Yb:KGW and Yb:KYW Crystals Laser Lines and Harmonics
Yb:KGW and Yb:KYW crystals have broad emission bandwidths and are used as lasing materials to generate ultrashort (~ 100-200 fs) high power pulses. Direct pump of Yb:KGW/KYW crystals with laser diodes operating at 981 nm supports compact laser systems. Yb:KGW/KYW laser generates pulses at 1023–1060 nm wavelength range.
Also Yb:KGW and Yb:KYW can be used as ultrashort pulses amplifiers.
We believe that Yb:KGW and Yb:KYW are some of the best materials for high power thin disk lasers generating femtosecond pulses.
Features:- High absorption coefficient at 981 nm
- High stimulated emission cross section
- Low laser threshold
- Extremely low quantum defect λpump/ λse
- Broad polarized output at 1023–1060 nm
- High slope efficiency with diode pumping (~ 60%)
- High Yb doping concentration.
Custom manufacturing capabilities:
- Various shapes (slabs, rods, cubes)
- Different dopant levels
- Diversified coatings
- Attractive prices for introductory quantities to OEMs.
| Name | Yb:KGW | Yb:KYW |
| Yb3+ concentration | 0.5-5% | 0.5-100% |
| monoclinic | monoclinic | |
| Lattice parameters |
a=8.095Å, b=10.43Å, c=7.588Å, β=94.43° |
a=8.05Å, b=10.35Å, c=7.54Å, β=94° |
| Thermal expansion |
αa=4X10-6 /°C,αb=3.6X10-6 /°C, αc=8.5X10-6 /°C |
- |
| Thermal conductivity |
Ka=2.6 W/mK, Kb=3.8 W/mK, Kc=3.4 W/mK, |
- |
| Density | 7.27 g/cm3 | 6.61 g/cm3 |
| Mohs' hardness | 4-5 | 4-5 |
| Melting temperature | 1075 °C | - |
| Transmission range | 0.35-5.5 μm | 0.35-5.5 μm |
| Refractive indices (λ=1.06 μm) | ng=2.037, np=1.986, nm=2.033 |
- |
| dn/dt | 0.4X10-6 K-1 | 0.4X10-6 K-1 |
| Laser wavelength | 1023-1060 nm | 1025-1058 nm |
| Fluorescence lifetime | 0.3 ms | 0.3 ms |
| Stimulated emission cross section (E| |a) |
2.6X10-20 cm2 | 3X10-20 cm2 |
| Absorbtion peak and bandwidth |
αa=26 cm-1, λ=981 μm, Δλ=3.7 nm |
αa=26 cm-1, λ=981μm, Δλ=3.7 nm |
| Absorbtion cross section | 1.2X10-19 cm2 | 1.33X10-19 cm2 |
| Lasing threshold | 35 mW | 70 mW |
| Stark levels energy (in cm-1) of the 2F5/2 manifolds of Yb3+ @ 77K |
10682, 10471, 10188 | 10695, 10476, 10187 |
| Stark levels energy (in cm-1) of the 2F7/2 manifolds of Yb3+ @ 77K |
535, 385, 163, 0 | 568, 407, 168, 0 |
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