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Nd:GdVO4
(Nd doped Gadolinium Orthovanadate)
Neodymium
doped Gadolinium Orthovanadate single crystal (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.
The followings are the main advantages of Nd:GdYO4
as a laser host :
--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.
1.Specifications:
|
Crystal structure |
Tetragona |
|
Space Group |
I41/amd |
|
Lattice paramete |
a=0721nm, 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%... |
2.Comparing The Neodymium Laser Host Crystals
|
Crystal |
Nd:YVO4
|
Nd:GdVO4
|
Nd:YAG |
|
Crystal Structure,Space Group |
tetragonal,
141/amd |
Tetragonal,
141/amd |
|
|
Lattice constants,nm |
a:0.721
b:0.629 |
a:0.721
b:0.635 |
|
|
Melting temperature,℃ |
1825 |
1780 |
|
|
Thermal expansion@25℃,
X10-6/℃ |
a |
4.43 |
a |
1.5 |
|
|
b |
11.4 |
b |
7.3 |
|
|
Specific heat@25℃,
cal/mol K |
24.6 |
32.6 |
|
|
dn/dT, x10-6/℃ |
2.7 |
4.7 |
|
|
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 |
|
|
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% |
3.Standard specifications of Nd:GdVO4
* Transmitting wavefront distortion:less than λ/4 @ 633nm
* Dimension tolerance:(W+/-0.1mm)*(H+/-0.1mm)*(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:<+/-0.5o
* AR coating: R<0.2% at 1064nm,HR
coating: One side:R>99.8%@1064nm,T>97%@808nm
* Another side: AR 1064 nm, R<0.2%
Shape :
Chips, cuboid,
Rod, Brewster etc.
4. Typical
Dimension:
3*3*12mm, 0.3at% doping, laser polished and AR coated 800-1342nm
4*4*7mm, 0.3at% doping, laser polished and AR coated 800-1342nm
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