Nd:KGW crystals are highly doped laser crystals with low pumping threshold and large emission cross section. Because of the W-O covalent bond, the cold shock effect of Nd3+ ion in KGW crystal is weakened, so this crystal has a higher doping concentration of active ions. In addition, Nd3+ ions in KGW crystals have an absorption bandwidth of about 12 nm half bandwidth at 808 nm, which can be well matched with the emission wavelength of commercial laser diodes.
Main features:
♦ High doping concentration and wide absorption band
♦ Excitation cross section height
♦ High Efficiency Raman Transformer
♦ Coupling with LD pump light source
♦ Low laser output threshold
Typical applications:
♦ Q-Switched Solid State Lasers
♦ Self-Raman Solid State Laser
♦ Mode-locked Lasers
Absorption and emission curves of Nd:KGW
Technical Parameters
| Argument Name | Values and Ranges |
Directional | [010] |
Length tolerance | +1.0/-0.0 |
Dimension tolerance | +/-0.1 |
Finish | 20/10 |
Parallelism | < 30 sec |
Perpendicularity | < 15 cent |
Doping concentration | 3%，5%，8% |
Coating | AR/AR coating at 1067 nm |
| Quality warranty period | 1 year (with normal use) |
Crystal Structure and Physical Properties
| Argument name | Values and Ranges |
| Crystal structure | Monoclinic |
Spatial groups | C2h (2/c) -C2/c |
Lattice constant | a=8.087Å；b=10.374 Å；c=7.588 Å；β=94.41˚ |
Refractive index of 1067nm | ng = 2.049；np = 1.978；nm = 2.014 |
Mohs hardness | 5 |
Density | 7.27 g/cm3 |
Melting point | 1075°C |
Thermal conductivity @ 373K,W x cm-1 x K-1 | K[100]= 0.026；K[010] = 0.038；K[001] = 0.034 |
Young's modulus | E[100] = 115.8；E[010] = 152.5；E[001] = 92.4 |
Coefficient of thermal expansion | α[100] = 4 × 10-6 K-1; α[010] = 1.6 × 10-6 K-1 ; α[001]= 8.5 × 10-6 K-1 |
Shock wavelength | 911 nm，1067 nm，1351 nm |
Absorb bandwidth | 808 nm (FWHM 12 nm) |
| Fluorescence lifetime | 110 µs (30% doping), 90 µs (8% doping) |
Standard Size
| Product NO. | Diameter（mm） | Length（mm） | Doping% | Coating |
| N-K-301 | 3 | 3 | 5% | AR/AR@808 nm+1067 nm |
| N-K-302 | 3 | 5 | 5% | AR/AR@808 nm+1067 nm |
| N-K-303 | 3 | 5 | 3% | AR/AR@808 nm+1067 nm |
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