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Nd:GdVO4
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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.
Table 1. Specifications of Nd:GdVO4
|
Crystal Structure |
Tetragonal |
|
Space Group |
I41/amd |
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Lattice Parameter |
a=0.721nm，b=0.635nm |
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Lasing Transition |
4F3/2 ----> 4I11/2 |
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Lasing Wavelength |
1062.9nm |
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Emission Cross Section（at 1064nm） |
7.6×10-19 cm2 |
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Absorption Cross Section（at 808nm） |
4.9×10-19 cm2 |
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Absorption Coefficient（at 808nm） |
74 cm-1 |
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Index of Refractivity（at 1064nm） |
no=1.972，ne=2.192 |
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Thermal Conductivity（<110>） |
11.7 W/(m×K) |
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Density |
5.47 g/cm3 |
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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
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Crystal |
Nd:GdVO4 |
Nd:YVO4 |
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Crystal Structure,Space Group |
Tetragonal, I41/amd |
Tetragonal, I41/amd |
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Lattice constants（nm） |
a：0.721 b：0.635 |
a：0.721 b：0.629 |
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Melting temperature（℃） |
1780 |
1825 |
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Thermal expansion @25℃，×10-6/℃ |
a |
1.5 |
a |
4.43 |
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b |
7.3 |
b |
11.4 |
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Specific heat @25℃，cal/mol·K |
32.6 |
24.6 |
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dn/dT，×10-6/℃ |
4.7 |
2.7 |
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Table 3. Information Regarding Neodymium Laser Host Crystals
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Crystal |
Nd:YVO4 |
Nd:GdVO4 |
Nd:YAG |
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Laser Wavelength |
1064.3nm，1342.0nm |
1062.9nm，1340nm |
1064.2nm，1338.2nm |
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Emission bandwidth |
0.8nm |
No data |
0.45nm |
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Effective laser cross section |
15.6×10-19 cm2 |
7.6×10-19 cm2 |
6.5×10-19 cm2 |
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Polarization |
Parallel to c-axis |
Parallel to c-axis |
unpolarized |
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Radioactive lifetime (microseconds) |
～100μs |
～95μs |
230μs |
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Pump wavelength |
808.5nm |
808.4nm |
807.5nm |
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Peak pump absorption at 1% doping |
～41 cm-1 |
～57 cm-1 |
/ |
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Thermal conductivity, W/m/K |
5.1 |
11.7 |
14 |
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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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Laser Crystals_Neodymium Doped Gadolinium Orthovanadate(Nd_GdVO4).pdf
