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Nd: GdVO4 Laser Crystals

Nd:GdVO4, 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. Nd:GdVO4 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.


Advantages of Nd GdVO4 Laser Crystals


  • Large stimulated emission cross-section at the laser wavelength

  • High absorption coefficient and wide bandwidth at the pump wavelength

  • Low dependency on pump wavelength

  • Good thermal conductivity

  • Low lasing threshold and high slope efficiency

  • High laser-induced damage threshold

  • Strongly-polarized laser output.


Applications of Nd GdVO4 Laser Crystals


  • DPSS

  • Laser industry machining

  • Laser ranging

  • Medical examination


Specifications of Nd GdVO4 Laser Crystals


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


Physical Properties of 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(℃)

1780

1825

Thermal expansion @25℃, x10^-6/℃

a

1.7

a

4.43

b

7.3

b

11.4

Specific heat @25℃, cal/mol·K

32.6

24.6

dn/dT, x10^-6/℃

4.7

2.7


Optical Properties of 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



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