Descriptions:
Nd:GdVO4 crystals has the
additional advantage over Nd:YVO4 of a much higher thermal conductivity. For CW lasing at 1.06 um and 1.34 um and
intracavity doubling with KTP and LBO, the gadolinium vanadate have produced a
higher slope efficiency or optical conversion than Nd:YVO4.
Physical
properties: Comparison between Nd:GdVO4 and Nd:YVO4 laser crystals
|
Crystal
|
Nd:GdVO4
|
Nd:YVO4
|
|
Crystal Structure,Space Group
|
Tetragonal, I41/amd
|
Tetragonal, I41/amd
|
|
Lattice constants (nm)
|
a:0.721 b:0.635
|
a:0.721 b:0.629
|
|
Melting temperature(0 C)
|
1780
|
1825
|
|
Thermal expansion @250C, x10-6/0C
|
a
|
1.7
|
a
|
4.43
|
|
b
|
7.3
|
b
|
11.4
|
|
Specific heat @250C, cal/mol·K
|
32.6
|
24.6
|
|
dn / dT, x10-6/0C
|
4.7
|
2.7
|
Optical
properties regarding Neodymium Laser Host Crystals
|
Crystal
|
Nd:YVO4
|
Nd:GdVO4
|
Nd:YAG
|
|
Laser wavelengths
|
1064.3nm,1342.0 nm
|
1062.9 nm,1340 nm
|
1064.2 nm,1338.2 nm
|
|
Emission bandwidth
(linewidth at 1064 nm)
|
0.8nm
|
No data
|
0.45nm
|
|
Effectivelasercross section(emission cross
section at 1064 nm)
|
15.6 x 10-19 cm2
|
7.6 x 10-19cm2
|
6.5 x 10-19cm2
|
|
Polarization
|
Parallel to c-axis
|
Parallel to c-axis
|
unpolarized
|
|
Radioactive lifetime (microseconds) at 1% Nd
doping
|
~ 100 µs
|
~ 95 µs
|
230 µs
|
|
Pump wavelength
|
808.5 nm
|
808.4 nm
|
807.5 nm
|
|
Thermal conductivity, W/m/K
|
5.1
|
11.7
|
14
|
|
Peak pump absorption at 1%
doping
|
~ 41 cm-1
|
~ 57 cm-1
|
|
HGO offers
NdYVO4 specifications:
|
Doping
|
0.1%~3%
|
|
Doping concentration tolerance
|
±0.05%(atm%<1%),±0.1%(atm%≥1%)
|
|
Orientation
|
A-cut/C-cut +/-0.5deg.
|
|
Dimension Tolerance
|
±0.1mm
|
|
Flatness
|
λ/10 @ 632.8nm
|
|
Wavefront distortion
|
λ/6@ 632.8nm
|
|
Surface Quality
|
10/5 per MIL-O-13830B
|
|
Parallelism
|
10″
|
|
Perpendicularity
|
10′
|
|
Bevel/Chamfer
|
<0.1mm@45deg.
|
|
Chips
|
<0.1mm
|
|
Clear Aperture
|
>95%
|
|
Coating
|
AR/HR/PR (IAD, EB, IBS)
coating upon customer’s request
|
|
Damage Threshold
|
750MW/CM2 at 1064nm, TEM00, 10ns, 10Hz
|
|
Quality Warranty Period
|
One year
under proper use
|
Advantages:
1)
Large stimulated emission cross section at laser
wavelength
2)
High absorption coefficient and wide bandwidth at pump
wavelength;
3)
Low dependency on pump wavelength;
4)
Good thermal conductivity;
5)
Low lasing threshold and high slope efficiency;
6)
High laser induced damage threshold;
7)
Strongly-polarized laser output.
Why
Choose HGO ?
HG
OPTRONICS.,INC. is capable of growing and processing this single crystal Nd:GdVO4 neodymium-doped gadolinium orthovanadate. As a professional laser
crystals supplier, we supply directly and indirectly more than 70% percent of
such laser host crystals with high quality and extremely low price to our
endusers. And get good reputation from customers all over the world.
