Description:
- Nd:KGW, as an excellent laser crystal, has low laser oscillations threshold, high emmission section and high doping concentraton for the weakened fluorescent concentration quench effect of the Nd3+.
Introduction
Neodymium doped Potassium Gadolinium Tungstate (Nd:KGd(WO4)2 or Nd:KGW) is an excellent laser gain material which has low laser oscillations threshold and high 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 808 nm of Nd3+ in the KGW which has 12 nm 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 |
| Lattice Parameter | a = 8.087 Å, b = 10.374 Å, c = 7.588 Å
β = 94.41° |
| Refractive Index, at 1067 nm | ng = 2.049, np = 1.978, nm = 2.014 |
| Mohs Hardness | 5 Mohs |
| Density | 7.27 g/cm3 |
| Melting Point | 1075℃ |
| Thermal Conductivity at 373 K | K[100] = 2.6 W/m/K
K[010] = 3.8 W/m/K K[001] = 3.4 W/m/K
|
| Young’s Modulus | E[100] = 115.8 Gpa, E[010] = 152.5 GPa,
E[001] = 92.4 Gpa
|
| Thermal Expansion Coefficient, at 373℃ | α[100] = 4×10-6 /K, α[010] = 1.6×10-6 /K, α[001] = 8.5×10-6 /K |
| Lasing Wavelength | 911 nm, 1067 nm, 1351 nm |
| Absorption Band | 808 nm (FWHM 12 nm) |
Specifications of Nd:KGW
| Standard Dopant Concentration | Nd: 3%, 5%, 8% atm% |
| Maximum Length | 50 mm |
| Dimensional Tolerances | Diameter: ±0.1mm
Length: ±0.5 mm
|
| Surface Quality (Scratch/Dig) | 20/10 to MIL-PRF-13830B |
| Flatness | λ/6 @633 nm |
| Parallelism | 20 arc sec |
| Perpendicularity | ≦ 15 arc min |
| Coating | AR-coated |
