Nd:KGW レーザ結晶
Neodymium doped Potassium-Gadolinium Tungstate crystal (Nd:KGd(WO4)2 or Nd:KGW) is an excellent laser gain material which has low laser oscillations threshold and higher emission section. The fluorescent concentration quench effect of the Nd3+ ion in the KGW crystal may be weakened due to the W-O covalent bond, so this crystal has a higher doping concentration of active ion. Furthermore, the absorption band at 808nm of Nd3+ in the KGW which has 12nm FWHM is well matched with the emission wavelength of current commercial laser diode.
Basic Properties
| Crystal structure | monoclinic |
| Space group | C2h(2/c)-C2/c |
| Cell Parameters | a = 8.087Å; b = 10.374 Å; c = 7.588Å β=94.41° |
| Refractive index, at 1067 nm | nq = 2.049; np = 1.978; nm = 2.014 |
| Mohs hardness | 5 |
| Density, g/cm3 | 7.27 |
| Melting Point: | 1075℃ |
| Thermal conductivity at 373°K, W x cm-1 x °K-1 | K[100] = 0.026; K[010]= 0.038; K[001] = 0.034 |
| Young’s modulus, GPa | E[100] = 115.8; E[010]= 152.5; E[001] = 92.4 |
| Termal expansion coefficient, at 373°K | α[100] = 4 x 10-6 x °K-1; α[010]= 1.6 x 10-6 x °K-1;α[001]= 8.5 x 10-6 x °K-1 |
| Lasing Wavelength |
911nm,1067nm,1351nm |
| Absorption band | 808nm(FWHM 12nm) |
| Fluorescent lifetime | 110 µs (3% doping), 90 µs ( 8% doping) |
Specifications of Nd:KGW
| Orientation | [010] |
| Standard Dopant concentration (at. %) | 3%, 5%, 8% |
| Maximum length | 50mm |
| Length tolerance, mm | +1.0 / -0.0 |
| Diameter tolerance, mm | +/-0.1 |
| Parallelism | < 30″ |
| Perpendicularity | < 15' |
| Surface quality | 20/10 (MIL-PRF-13830B) |
| coating | AR-coated |
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- Nd:KGW レーザ結晶
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