Nd:KGW Laser Crystal
Nd:KGW crystals are known as excellent laser crystals due to their low laser oscillation threshold and large emission cross-section.
The fluorescence quenching effect of Nd3+ ions in KGW crystals may be weakened by W-O covalent bonds, so this crystal has a high concentration of active ions added.
Furthermore, the 808 nm absorption band (FWHM12 nm) of Nd3+ in KGW crystals matches well with the emission wavelength of LDs currently widely used.
Basic Properties
| Crystal Structure | monoclinic |
|---|---|
| Space Group | C2h(2/c)-C2/c |
| Cell Parameters | a = 8.087Å; b = 10.374 Å; c = 7.588 Å 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 × cm-1 ×°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 × 10-6 × °K-1; α[010]= 1.6 × 10-6 × °K-1;α[001]= 8.5 × 10-6 × °K-1 |
| Lasing Wavelength | 911 nm, 1067 nm, 1351 nm |
| Absorption Band | 808 nm (FWHM 12 nm) |
| 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 | 50 mm |
| 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 |
