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![[ Castech ]<Br>Nd:GdVO4<br>Laser Crystal](/thum_img/mjct/goods_img3/b765e18beb7c11256ef588ad65eb672d_water_4de0b559c44a49f5f544fca08f3bc282_c0_w500_h500.jpg)
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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. Basic Properties
|
Crystal Structure |
Tetragonal, space group I41/amd |
|
Lattice Parameter |
a = 7.21 Å, c = 6.35 Å |
|
Lasing Transition |
4F3/2→4I11/2 |
|
Lasing Wavelength |
1062.9 nm |
|
Emission Cross Section (at 1064 nm) |
7.6 × 10-19 cm2 |
|
Absorption Cross Section (at 808 nm) |
4.9 × 10-19 cm2 |
|
Absorption Coefficient (at 808 nm) |
74 cm-1 |
|
Index of Refractivity ( at 1064 nm) |
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 Parameter |
a = 7.21 Å, c = 6.35 Å |
a = 7.21 Å, c = 6.29 Å |
||
|
Melting Temperature (℃) |
1780 |
1825 |
||
|
Thermal Expansion @25 ℃, ×10-6/℃ |
a |
1.5 |
a |
4.43 |
|
c |
7.3 |
c |
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 Wavelengths |
1064.3 nm, 1342.0 nm |
1062.9 nm, 1340 nm |
1064.2 nm, 1338.2 nm |
|
Emission Bandwidth (linewidth at 1064 nm) |
0.8 nm |
No data |
0.6 nm |
|
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 |
|
Fluorescence Lifetime with 1% Nd Doping |
~ 100 µs |
~ 95 µs |
~ 230 µs |
|
Pump Wavelength |
808.5 nm |
808.4 nm |
807.5 nm |
|
Peak Pump Absorption at 1% Doping |
~ 41 cm-1 |
~ 57 cm-1 |
|
|
Thermal Conductivity |
5.1 W/m/K |
11.7 W/m/K |
14 W/m/K |
|
Doping Concentration Range |
0.1 - 3.0% |
0.1 - 3.0% |
0.3- 2.0% |
Specifications of Nd:GdVO4 crystal from CASTECH：
|
Dimension Tolerance |
(W ± 0.1 mm) × (H ± 0.1 mm) × (L +0.2/-0.1 mm) |
|
Clear Aperture |
Central 90% of the diameter |
|
Flatness |
≦ λ/8 @633 nm (L≧2.5 mm) ≦ λ/4 @633 nm (L<2.5 mm) |
|
Surface Quality (Scratch/Dig) |
10/5 to MIL-PRF-13830B |
|
Transmitted Wavefront Distortion |
≦ λ/4 @633 nm |
|
Parallelism |
20 arc sec |
|
Perpendicularity |
≦ 15 arc min |
|
Angle Tolerance |
≦ ±0.5° |
|
Chamfer |
≦ 0.2 mm × 45° |
|
Chip |
≦ 0.1 mm |
|
AR Coating |
R < 0.2% @1064 nm |
|
HR Coating |
R ＞ 99.8% @1064 nm, T ＞ 95% @808 nm |
|
Quality Warranty Period |
One year under proper use. |
