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Nd:GdVO4 - Neodymium Doped Gadolinium Orthovanadate

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Nd:GdVO4 - Neodymium Doped Gadolinium Orthovanadate
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  • Nd:GdVO4 - Neodymium Doped Gadolinium Orthovanadate

  • Nd:GdVO4 is an excellent laser crystal with similar properties to Nd:YVO4 in physical, optical and mechanical properties. It is an ideal laser host crystal for diode-pumped all-solid-state laser.
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CASTECH's Nd:GdVO4 is featured by:

      • Large stimulated emission cross section at laser wavelength;
      • High absorption coefficient and wide bandwidth at 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.

 

Table 1. Basic Properties

Crystal Structure

Tetragonal, space group I41/amd

Lattice Parameter

a = 7.21 Å, c = 6.35 Å

Lasing Transition

4F3/24I11/2

Lasing Wavelength

1062.9 nm

Emission Cross Section (at 1064 nm)

7.6 × 10-19 cm2

Absorption Cross Section (at 808 nm)

4.9 × 10-19 cm2

Absorption Coefficient (at 808 nm)

74 cm-1

Index of Refractivity ( at 1064 nm)

no = 1.972, ne = 2.192

Thermal Conductivity (<110>)

11.7 W/m/K

Density

5.47 g/cm3

Nd Dopant Level (atomic)

0.1%, 0.2%, 0.3%, 0.5%, 0.7%, 1.0%...

 

Table 2.  Material Properties: Comparing Nd:GdVO4 and Nd:YVO4

  Crystal

Nd:GdVO4

Nd:YVO4

  Crystal Structure, Space Group

Tetragonal, I41/amd

Tetragonal, I41/amd

  Lattice Parameter

a = 7.21 Å, c = 6.35 Å

a = 7.21 Å, c = 6.29 Å

  Melting  Temperature (℃)

1780

1825

  Thermal Expansion @25 ℃, ×10-6/℃

a

1.5

a

4.43

c

7.3

c

11.4

  Specific Heat @25 ℃, cal/mol·K

32.6

24.6

  dn/dT, × 10-6 /℃

4.7

2.7

 

Table 3. Information Regarding Neodymium Laser Host Crystals

Crystal

Nd:YVO4

Nd:GdVO4

Nd:YAG

Laser Wavelengths

1064.3 nm, 1342.0 nm

1062.9 nm, 1340 nm

1064.2 nm, 1338.2 nm

Emission Bandwidth

(linewidth at 1064 nm)

0.8 nm

No data

0.6 nm

Effective Laser Cross Section

(emission cross section at 1064 nm)

15.6 × 10-19 cm2

7.6 × 10-19 cm2

6.5 × 10-19 cm2

Polarization

Parallel to c-axis

Parallel to c-axis

unpolarized

Fluorescence Lifetime

with 1% Nd Doping

~ 100 µs

~ 95 µs

~ 230 µs

Pump Wavelength

808.5 nm

808.4 nm

807.5 nm

Peak Pump Absorption at 1% Doping

~ 41 cm-1

~ 57 cm-1

 

Thermal Conductivity

5.1 W/m/K

11.7 W/m/K

14 W/m/K

Doping Concentration Range

0.1 - 3.0%

0.1 - 3.0%

0.3- 2.0%

 

Specifications of Nd:GdVO4 crystal from CASTECH:  

Dimension Tolerance

(W ± 0.1 mm) × (H ± 0.1 mm) × (L +0.2/-0.1 mm)

Clear Aperture 

Central 90% of the diameter

Flatness

≦ λ/8 @633 nm (L≧2.5 mm)

≦ λ/4 @633 nm (L<2.5 mm)

Surface Quality (Scratch/Dig)

10/5 to MIL-PRF-13830B

Transmitted Wavefront Distortion

≦ λ/4 @633 nm

Parallelism

20 arc sec

Perpendicularity

≦ 15 arc min

Angle Tolerance

≦ ±0.5°

Chamfer

≦ 0.2 mm × 45°

Chip

≦ 0.1 mm

AR Coating

R < 0.2% @1064 nm

HR Coating

R > 99.8% @1064 nm, T > 95% @808 nm

Quality Warranty Period

One year under proper use.

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