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Nd:GdVO4 Crystals

Nd:GdVO4 Crystals
Nd:GdVO4 Crystals

Nd:GdVO4 (Neodymium doped Gadolinium Vanadate) crystal is a promising material for diode pumped lasers. Similar to the more well-known Nd:YVO4 crystal, Nd:GdVO4 crystal also exhibits high gain, low threshold, and high absorption coefficients at pumping wavelengths. Moreover, Nd:GdVO4 has the additional advantage over Nd:YVO4 of a much higher thermal conductivity. For CW lasing at 1063 nm and 1340 nm and intracavity doubling with KTP and LBO, Nd:GdVO4 has produced a higher slope efficiency or optical conversion than Nd:YVO4.

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Newlight's Nd:GdVO4 Features,
 

  Low lasing threshold and high slope efficiency

  Large stimulated emission cross-section at lasing wavelength

  High absorption over a wide pumping wavelength bandwidth

  Optically uniaxial and large birefringence emitting polarized laser

  Large thermal conductivity, ~ twice of that of Nd:YVO4


Structure and Basic Physical Properties:
 

Crystal Structure

Zircon tetragonal,  a=b=7.212, c=6.350

Space Group

Tetragonal I41/amd

Melting Point 1780 oC
Thermal Conductivity,  <110> 11.7 W/m/K
Thermal Expansion Coefficient (@300K) αa=1.5x10-6 /K
αc=7.3x10-6/K
Specific Heat @25oC 32.6 (cal/mol/K )
Thermo-Optical Coefficient (dn/dT) 4.7x10-6 /oC

Density

5.48 g/cm3
Mohs Hardness 4.6 - 5


Optical Properties:
 

Lasing Transition

4F3/2 - 4I1/2

Lasing Wavelength

1062.9 nm, 1340.0 nm

Emission Cross Section (E//c at 1064 nm)

7.6x10-19 cm2

Peak absorption wavelength 808 nm

Absorption Cross Section (E//c at 808 nm)

4.9x10-19  cm2

Absorption Linewidth

3 nm

Relaxation Time of Terminal Lasing Level

100 µs

Absorption Coefficient  (1% Nd)

57 cm-1 with E//c @ 808 nm 


Index of Refraction:
 

Wavelength (nm)

630

850

1064

1300

1550

no

2.01685

1.99490

1.98535

1.97889

1.97410

ne

2.25431

2.21482

2.19813

2.18742

2.18009

 


​Specifications on Finshed Nd:GdVO4:
 

Nd: Dopant Level

0.5 - 1.0% (Atomic Pencentage, atm%)

Wavefront Distortion

< λ/4 per 25 mm @ 633 nm

Scattering Sites

Invisible when probed with a He-Ne laser

Orientation

Axis along a- or c- axis ( +/-0.5 deg.)

Dimensional Tolerance

+/-0.1 mm

End-faces Configuration

Plano/Plano

Surface Quality:

10/5 Scratch/Dig per MIL-O-13830B

Flatness

λ/10 at 633 nm

Clear Aperture  

> Central 90%

Parallelism

< 10 arc sec.

Intrinsic Loss

< 0.1% cm-1

 


Standard coatings:
 

AR/AR:
On the first surface S1: AR@1064 nm (R<0.1%), HT@808 nm(T>95%);
On the second surface S2: AR@1064 nm

HR/AR:
On the first surface S1: HR@1064 nm (R>99.8%)
, HT@ 808 nm(T>95%);
On the second surface S2: AR@1064 nm

 

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