Nd:KGW
Nd: KGW crystal is a laser crystal that can realize high-concentration doping. Because the crystal can be mixed with high concentrations of Nd ions and has a large emission area, its monopulse and low-repeat laser performance is better than Nd: YAG. The absorption band of Nd: KGW crystal is at 808 nm, which can effectively couple with the LD pump source (emitting wavelength is 808 nm) to improve its luminous efficiency. Moreover, its half height and width of 12 nm allows it to accommodate the drift of LD emission wavelength with temperature, which is conducive to conducting diode-pumped KGw laser experiment and device research. Nd: KGW can realize free oscillation, Q switching, mode-locking operation, and Raman conversion.
Nd: KGW crystal—A crystal can be generated from excited Raman scattering and become a multi-wavelength light source in visible band after frequency doubling.
The Nd:KGW Crystal Has The Following Characteristics:
- High excited beam cross-section
- Low pumping threshold
- High output energy
- High conversion efficiency
- Two high Raman gain coefficients (768 and 901 cm-1)
Since the fundamental frequency light of Raman crystal is 911 nm, 1067 nm, and 1351 nm, the red, yellow, and blue light of 0.455 um, 0.533 um, and 65 um can be produced after frequency multiplication. It can be used in material processing, optical communication, tele-sensing, medicine, environmental monitoring, precision measurement, and other fields.
Features of Nd:KGW Crystal:
- High doping concentration
- Highly excited cross-section
- High Raman gain coefficient
- Good coupling with LD
- Wide absorption bandwidth
- Low lasing threshold
Physical Properties
| Nd Concentration | 2.2%(cw),3%(quasi-cw) |
| Fluorescence Lifetime | 130 μs |
| Stimulated Emission Cross Section | 3.7*10-19 cm2 |
| Transition Wavelength | 1067 nm |
| Thermal Conductivity | Ka=2.6 W/Km |
| Kb=3.8 W/Km | |
| Kc=3.4 W/Km | |
| dn / dT | 0.4*10-6 K-1 |
| Refractive Index@ 1.06μm | np=1.978 |
| nm=2.014 | |
| ng=2.049 | |
| Thermal Expansion Coefficient | (100):4*10-6 K-1 |
| (010):3.6*10-6 K-1 | |
| (001):8.5*10-6 K-1 | |
| Density（g * cm-3） | 7.248 |
| Specific Heat Capacity Cp | 500 Jkg-1K-1 |
Spectral Properties
| Laser Wavelength (nm) | 1067 |
| Emission Cross-section (pm2)2 | 32.3 |
| Gain Bandwidth (nm) | 2.73 |
| Fluorescence Lifetime (μs) | 110 at 3% doping |
| Thermal conductivity (Wm-1K-1） | ~3 |
Absorption and Emission Spectra
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References
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| [2] Graf T , Balmer J E . Lasing properties of diode-laser-pumped Nd:KGW[J]. Optical Engineering, 1995, 34(8):2349-2352. |
| [3] Demidovich A A , Shkadarevich A P , Danailov M B , et al. Comparison of cw laser performance of Nd:KGW, Nd:YAG, Nd:BEL, and Nd:YVO4 under laser diode pumping[J]. Applied Physics B, 1998, 67(1):11-15. |
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| [14] Huang, Jianhong, Lin, et al. Short pulse eye-safe laser with a stimulated Raman scattering self-conversion based on a Nd:KGW crystal.[J]. Optics letters, 2007, 32(9):1096-8. |
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| [27] Bogdanovich M V , Grigor’Ev A V , Lantsov K I , et al. A high-power optical parametric oscillator based on a master Nd : KGW laser with a high repetition rate[J]. Quantum Electronics, 2017, 47(4):308-312. |
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