| Neodymium Doped
Gadolinium Orthovanadate(Nd:GdVO4) |
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Nd:GdVO4 is an excellent laser crystal. This crystal is
ideal laser host material for the DPSS (Diode pumped Solid
State) micro/mini lasers as its good physical, optical and
mechanical properties. It has higher slope efficiency than
Nd:YAG and better thermal conductivity, higher power output
than Nd:YVO4,
so it is a good choice to use Nd:GdVO4
for high power output DPSS lasers. |
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.
Specifications:
| 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 |
7.6x10-19cm-2 |
6.5x10-10cm-2 |
| 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 |
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| 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-O-13830A
• 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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