Laser Crystals

Nd:GdVO4

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. With advanced technology on growing and manufacturing high optical quality Nd:GdVO4 crystals, FOCtek can provide a wide variety of finished crystals, our general Nd:GdVO4 production capabilities include.

Capabilities Include:

1)
Nd dopant concentration: 0.2---3.0 atm%
2)
Dopant tolerance: within 10% of concentration.
3)
Diameter : 0.02 ~ 20mm
4)
Length: 0.02 ~ 20mm
   
 

1)

Orientation:

a-cut crystalline direction(+/-0.20)

2)

Dimensional tolerance:

+/-0.1mm(typical)High precision +/-0.005mm can be available upon request.

3)

Wavefront Distortion:

<l/8@633nm

4)

Surface quality:

better than 20/10 Scratch/Dig per MIL-O-1380A

5)

Parallelism:

< 10 arc seconds

6)

Perpendicularity:

< 5 arc minutes

7)

Surface flatness:

<ll/10 at 632.8nm

8)

Clear aperture:

Central 95%

9)

Chamfer:

0.15x450

10)

Damage threshold:

over 15J/cm2 (rods without coating) over 700 MW/cm2 (coating)

11)

Coating:

AR@1063nm, R< 0.1% & HT@808nm, T>95%(see coating 3-1 )
HR@1063nm, R>99.8% & HT@808nm, T>95%(see coating 3-2 )
HR@1063nm, R>99.8%, HR@532 nm, R>99% & HT@808 nm, T>95%
AR@1063 nm, R<0.1%(see coating 3-3 )

 

coating 3-1
coating 3-2
coating 3-3
Notes:

To inquiry or order a finished Nd:GdVO4 laser crystals, please specify the specification listed above, for common online_ordering, we only need to know the main specification: Nd-dopant concentration, sizes, surface quality and coating. For special request, please specify specification in details for evaluation and fabrication.


Physical and Optical Properties


 

Crystal Structure

Zircon Tetragonal, space group D4h, a=b=7.21, c=6.35

Melting Point 1780°C
Density 5.47g/cm 3
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>


 


Absorption Curve

Fluorescence Spectra Curve



 

Crystal Structure

Zircon Tetragonal, space group D4h, a=b=7.21, c=6.35

Melting Point

1780°C

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>

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=ncno=1.9854, ne=2.1981,@ 1064nmno=2.0382, ne=2.2929, @ 532nmno=1.9977, ne=2.2198, @ 808nm

Thermal Optical Coefficient

dn/dT=4.7x10-6/K

Stimulated Emission Cross-Section

7.60x10-19cm2 , @1064 nm

Fluorescent LifetimeNd=1.2 atm%

95 ms @ 808 nm

Loss Coefficient

0.003 cm-1@ 1064 nm

Absorption CoefficienceNd=1.2 atm%

74 cm-1 @ 808 nm

Absorption LengthNd=1.2 atm%

0.18 mm @ 808 nm

Intrinsic LossNd=1.2 atm%

Less 0.1% cm-1 , @1064 nm

Line width

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


Nd:GdVO4 properties compare with Nd:YVO4
 

-

Nd:GdVO4, 1.2 atm% Nd

Nd:YVO4 1 atm% Nd
Melting temperature (T°C)

1780

1825

Fluorescence lifetime ( t )

95 m s

100 m s

Stimulated emission cross section ( s ) 7.6x10 -19 cm -2 15.6x10 -19 cm -2 ( p -pol)

Absorption coefficient

78cm -1 31.2 cm -1
La 0.18mm 0.32mm
Threshold power 70mw 78mw
Conversion efficiency h s 50% 48.6%
Thermal conductivity coefficient 11.7w/m/k 5.10w/m/k