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)
Width X Height: 1X1 ~ 16X16 mm
4)
Length: 0.02 ~ 20mm
   
 Typical Sepecification and Tolerance:

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:

<l/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 (coated)

11)

Coating:

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

 


Absorption Curve

Fluorescence Spectra Curve



 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/ 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=n  

no=1.9854, ne=2.1981,@ 1064nm

no=2.0382, ne=2.2929, @ 532nm

no=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 μs@ 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 1.1 atm% Nd
Melting temperature (T°C)

1780

1825

Fluorescence lifetime ( t )

95 μs

100 μs

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

 

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