Description:
Nd:GdVO4 Crystal (Neodymium Doped Gadolinium Orthovanadate )
Nd:GdVO4 is an excellent laser crystal with similar properties to Nd:YVO4 in physical, optical and mechanical properties. It is an ideal laser host crystal for diode-pumped all-solid-state laser.
Nd:GdVO4, is a promising material for diode pumped lasers. Similar to the more well-known Nd:YVO4 crystal, Nd:GdVO4 crystal also exhibits high gain, low threshold, and high absorption coefficients at pumping wavelengths. Nd:GdVO4 has the additional advantage over Nd:YVO4 of a much higher thermal conductivity. For CW lasing at 1.06 um and 1.34 um and intracavity doubling with KTP and LBO, the gadolinium vanadate have produced a higher slope efficiency or optical conversion than Nd:YVO4.
Advantages:
- Large stimulated emission cross section at laser wavelength
- High absorption coefficient and wide bandwidth at pump wavelength;
- Low dependency on pump wavelength;
- Good thermal conductivity;
- Low lasing threshold and high slope efficiency;
- High laser induced damage threshold;
- Strongly-polarized laser output.
Physical properties: Comparison between Nd:GdVO4 and Nd:YVO4 laser crystals
| Crystal | Nd:GdVO4 | Nd:YVO4 | ||
| Crystal Structure,Space Group | Tetragonal, I41/amd | Tetragonal, I41/amd | ||
| Lattice constants (nm) | a:0.721 b:0.635 | a:0.721 b:0.629 | ||
| Melting temperature(0 C) | 1780 | 1825 | ||
| Thermal expansion @250C, x10-6/0C | a | 1.7 | a | 4.43 |
| b | 7.3 | b | 11.4 | |
| Specific heat @250C, cal/mol·K | 32.6 | 24.6 | ||
| dn / dT, x10-6/0C | 4.7 | 2.7 | ||
Optical properties regarding Neodymium Laser Crystals
| Crystal | Nd:YVO4 | Nd:GdVO4 | Nd:YAG |
| Laser wavelengths | 1064.3nm,1342.0 nm | 1062.9 nm,1340 nm | 1064.2 nm,1338.2 nm |
| Emission bandwidth
(linewidth at 1064 nm) |
0.8nm | No data | 0.45nm |
| Effectivelasercross section(emission cross section at 1064 nm) | 15.6 x 10-19 cm2 | 7.6 x 10-19cm2 | 6.5 x 10-19cm2 |
| Polarization | Parallel to c-axis | Parallel to c-axis | unpolarized |
| Radioactive lifetime (microseconds) at 1% Nd doping | ~ 100 µs | ~ 95 µs | 230 µs |
| Pump wavelength | 808.5 nm | 808.4 nm | 807.5 nm |
| Thermal conductivity, W/m/K | 5.1 | 11.7 | 14 |
| Peak pump absorption at 1%
doping |
~ 41 cm-1 | ~ 57 cm-1 |
AOST offers NdYVO4 specifications:
| Dimension Tolerance | (W ± 0.1 mm) × (H ± 0.1 mm) × (L +0.2/-0.1 mm) |
| Flatness | ≦λ/8 @633 nm (L≧2.5 mm)
≦λ/4 @633 nm (L<2.5 mm) |
| Wavefront distortion | λ/4@ 632.8nm |
| Surface Quality | 10/5 to MIL-PRF-13830B |
| Parallelism | 20 arc sec |
| Perpendicularity | <15 arc min |
| Bevel/Chamfer | <0.2mm@45deg. |
| Chips | <0.1mm |
| Clear Aperture | Centrial 90% of the diameter |
| Coating | AR/HR/PR (IAD, EB, IBS) coating upon customer’s request |
| Quality Warranty Period | One year under proper use |
