GdVO4 Laser Crystals Tetragonal MIL PRF 13830B
Nd:YVO4
CASTECH's Nd:GdVO4 is featured by:
• 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.
CASTECH Warranty on Nd:GdVO4 Specifications:
• Wavefront Distortion:<λ/4 @ 633nm;
• Dimension Tolerance:(W±0.1mm)x(H±0.1mm)x(L+0.2/-0.1mm);
• Clear aperture: >90%;
• Flatness: λ/8 @ 633 nm, λ/4 @ 633nm for thickness less than 2mm;
• Scratch/Dig code: 10/5 to MIL-PRF-13830B;
• Parallelism: ＜20″;
• Perpendicularity: ＜5′;
• Angle Tolerance:＜±30′ .
Table 1. Specifications of Nd:GdVO4
| Crystal Structure | Tetragonal |
| Space Group | I41/amd |
| Lattice Parameter | a=0.721nm,b=0.635nm |
| Lasing Transition | 4F3/2 ----> 4I11/2 |
| Lasing Wavelength | 1062.9nm |
| Emission Cross Section(at 1064nm) | 7.6×10-19 cm2 |
| Absorption Cross Section(at 808nm) | 4.9×10-19 cm2 |
| Absorption Coefficient(at 808nm) | 74 cm-1 |
| Index of Refractivity(at 1064nm) | no=1.972,ne=2.192 |
| Thermal Conductivity(<110>) | 11.7 W/(m×K) |
| Density | 5.47 g/cm3 |
| Nd Dopant level (atomic) | 0.1%,0.2%,0.3%,0.5%,0.7%,1.0%,... |
Table 2. Material Properties: Comparing Nd:GdVO4 and Nd:YVO4
| 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(℃) | 1780 | 1825 | ||
| Thermal expansion @25℃,×10-6/℃ | a | 1.5 | a | 4.43 |
| b | 7.3 | b | 11.4 | |
| Specific heat @25℃,cal/mol·K | 32.6 | 24.6 | ||
| dn/dT,×10-6/℃ | 4.7 | 2.7 | ||
Table 3. Information Regarding Neodymium Laser Host Crystals
| Crystal | Nd:YVO4 | Nd:GdVO4 | Nd:YAG |
| Laser Wavelength | 1064.3nm,1342.0nm | 1062.9nm,1340nm | 1064.2nm,1338.2nm |
| Emission bandwidth (linewidth at 1064 nm) |
0.8nm | No data | 0.45nm |
| Effective laser cross section (emission cross section at 1064 nm) |
15.6×10-19 cm2 | 7.6×10-19 cm2 | 6.5×10-19 cm2 |
| Polarization | Parallel to c-axis | Parallel to c-axis | unpolarized |
| Radioactive lifetime (microseconds) at 1% Nd doping |
～100μs | ～95μs | 230μs |
| Pump wavelength | 808.5nm | 808.4nm | 807.5nm |
| Peak pump absorption at 1% doping | ～41 cm-1 | ～57 cm-1 | / |
| Thermal conductivity, W/m/K | 5.1 | 11.7 | 14 |
| Doping concentration range | 0.1-3.0% | 0.1-3.0% | 0.1-2.0% |
CASTECH Warranty on Nd:GdVO4 Specifications:
• Wavefront Distortion:<λ/4 @ 633nm;
• Dimension Tolerance:(W±0.1mm)x(H±0.1mm)x(L+0.2/-0.1mm);
• Clear aperture: >90%;
• Flatness: λ/8 @ 633 nm, λ/4 @ 633nm for thickness less than 2mm;
• Scratch/Dig code: 10/5 to MIL-PRF-13830B;
• Parallelism: ＜20″;
• Perpendicularity: ＜5′;
• Angle Tolerance:＜±30′ .
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