Nd:GdVO4 レーザ結晶
Neodymium Doped Gadolinium Orthovanadate(Nd:GdVO4)
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.
仕様
| Crystal structure | Tetragona |
| Space Group | I41/amd |
| Lattice paramete | a=0.721nm, b=0.635nm |
| Lasing Transition | 4F3/2 → 4I11/2 |
| Lasing wavelength | 1062.9nm |
| Emission Cross Section (at 1064nm) | 7.6x10-19 cm2 |
| Absorption Cross Section (at 808nm) | 4.9x10-19 cm2 |
| Absorption Coefficient (at 808nm) | 74cm-1 |
| Index of Refractivity (at 1064nm) | n0=1.972, ne=2.192 |
| Thermal Conductivity (<110>) | 11.7W/(mxK) |
| Density | 5.47g/cm3 |
| Nd Dopent level (atomic) | 0.1%, 0.2%, 0.3%, 0.5%, 0.7%, 1.0%... |
Information Regarding Neodymium Laser Host Crystals
| Crystal | Nd:YVO4 | Nd:GdVO4 | Nd:YAG |
| Laser wavelengths | 1064.3nm,1342.0nm | 1062.9nm,1340nm | 1064.2nm,1338.2nm |
| Emission bandwidth (linewidth at 1064nm) | 0.8nm | No dara | 0.45nm |
| Effective laser cross section (emission cross section at 1064nm) | 15.6x10-19cm2 | 7.6x10-19cm2 | 6.5x10-10cm2 |
| 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/nK | 5.1 | 11.7(Ref.7) | 14 |
| Doping concentration range | 0.1～3.0% | 0.1～3.0% | 0.1～2.0% |
Material Properties:Comparing Nd:GdVO4 and Nd:YVO4
| Crystal | Nd:GdVO4 | Nd:YVO4 | ||
| Crystal Structure,Space Group | Tetragonal,141/amd | tetragonal,141/amd | ||
| Lattice constants,nm | a:0.721 b:0.635 | a:0.721 b:0.629 | ||
| Melting temperature,℃ | 1780 | 1825 | ||
| Thermal expansion@25℃, X10-6/℃ | a | 1.5 | a | 4.43 |
| b | 7.3 | b | 11.4 | |
| Specific heat@25℃,cal/mol K | 32.6 | 24.6 | ||
| dn/dT, x10-6/℃ | 4.7 | 2.7 | ||
CASTECH Warranty on Nd:GdVO4 Specifications
- Transmitting wavefront distortion:less than λ/4 @ 633nm
- Dimension tolerance:(W±0.1mm)x(H±0.1mm)x(L+0.2mm/-0.1)
- Clear aperture:>90% central area
- Flatness: λ/8 @ 633 nm, and λ/4 @ 633nm for thickness less than 2mm
- Scratch/Dig code: 10/5 to MIL-PRF-13830B
- Parallelism:better than 20 arc seconds
- Perpendicularity: 5 arc minutes
- Angle tolerance:<±0.5°
- AR coating: R<0.2% at 1064nm
- HR coating:R>99.8%@1064nm,T>95%@808nm
- Quality Warranty Period:one year under proper use.
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