Nd:GdVO4

Neodymium doped Gadolinium Vanadate (Nd:GdVO4) is a promising material for diode pumped laser. Similar to Nd:YVO4 crystal, Nd:GdVO4 crystal also exhibits high gain, low threshold, and high absorption coefficients at pumping wavelengths, which result from the excellent fit of the neodymium dopant in the crystal lattice. Nd:GdVO4 has the additional advantage over Nd:YVO4 of a much higher thermal conductivity.

 

Compare Nd:GdVO4 properties with Nd:YVO4

-
Nd:GdVO4, 1.2 atm% Nd
Nd:YVO4 1 atm% Nd
Melting temperature (T©C)
1780
1825
Fluorescence lifetime (t)
95ms
100ms
Stimulated emission cross section (s)
7.6x10-19cm-2
15.6x10-19cm-2(p-pol)
Absorption coefficient
78cm-1
31.2 cm-1
La
0.18mm
0.32mm
Threshold power
70mw
78mw
Conversion efficiency hs
50%
48.6%
Thermal conductivity coefficient
11.7w/m/k
5.10w/m/k

Availability:

Nd dopant concentration:
0.2 ~ 3 atm%
Dopant tolerance:
within 10% of concentration
Diameter:
0.02 ~ 20mm
Length:
0.02 ~ 20mm
Coating specification:
        AR@1063nm, R< 0.1% & HT@808nm, T>95%
         HR@1063nm, R>99.8% & HT@808nm, T>9%
         HR@1063nm, R>99.8%, HR@532 nm, R>99% & HT@808 nm, T>95%
         AR@1063 nm, R<0.1%
 


Typical specification and tolerance:
 
 

Orientation:
a-cut crystalline direction (+/-5癈)
Dimensional tolerance:
Typical: +/-0.1mm
High precision: +/-0.005mm
Wavefront Distortion:
<l/8 at 633nm
Surface quality:
better than 20/10 Scratch/Dig per MIL-O-1380A
Parallelism:
< 10 arc seconds
Perpendicularity:
< 5 arc minutes
Surface flatness:
<l/10 at 632.8nm
Clear aperture:
Central 95%
Chamfer:
0.15x45o
Damage threshold:
over 15J/cm2 (rods without coating) over 700 MW/cm2 (coating)

Notes:
To inquire or order a finished Nd:GdVO4 laser crystals, please provide specifications as listed above. For most applications, we only need to know the following:
1)Nd-dopant concentration;
2)sizes;
3)surface quality; and
4) coating.

For special request, please provide detailed specification for evaluation and fabrication.
Physical and Chemical Properties:

Crystal Structure
Zircon Tetragonal, space group D4h, a=b=7.21, c=6.35
Melting Point
1780癈
Density
5.47g/cm3
Mohs Hardness
Glass-like, ~ 5
Thermal Expansion Coefficient
aa=1.5x10-6/K, ac=7.3x10-6/K
Thermal Conductivity Coefficient
11.7 W/m/K <110>


Optical Properties:
 

Peak Absorption Wavelength
808.5 nm
Lasing Wavelength
912.6 nm, 1063.1 nm, 1341.3 nm
Crystal Class
positive uniaxial, no=na=nb ne=nc
no=1.9854, ne=2.1981, @1064nm
no=2.038184, ne=2.292962, @532nm
no=1.9977322, ne=2.219864, @808nm
Thermal Optical Coefficient
dn/dT=4.7x10-6/K
Stimulated Emission Cross-Section
7.60x10-19cm2 , @1064 nm
Fluorescent Lifetime
95 ms (1 atm% Nd doped) @808 nm
Loss Coefficient
0.003 cm-1@1064 nm
Absorption Coefficient
74 cm-1 @808nm (1.2%)
Absorption Length
0.32 mm @808nm
Intrinsic Loss
Less 0.1% cm-1 , @1064 nm
Linewidth
0.6 nm
Polarized Laser Emission
p parallel to optic axis (c-axis)
Diode Pumped Optical to Optical
Efficiency
> 60%
Sellmeier Equation (for pure GdVO4
crystals)
ne2=4.734369+0.1216149/(l2 - 0.0523664)
- 0.013927l2

no2=3.8987165+0.05990622/(l2 - 0.0514395) - 0.011319l2