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Nd:GdVO4


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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. Specifications of Nd:GdVO4

Crystal Structure

Tetragonal

Space Group

I41/amd

Lattice Parameter

a=0.721nm,b=0.635nm

Lasing Transition

4F3/2 ----> 4I11/2

Lasing Wavelength

1062.9nm

Emission Cross Section(at 1064nm)

7.6×10-19 cm2

Absorption Cross Section(at 808nm)

4.9×10-19 cm2

Absorption Coefficient(at 808nm)

74 cm-1

Index of Refractivity(at 1064nm)

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 constants(nm)

a:0.721     b:0.635       

a:0.721     b:0.629        

Melting temperature(℃)

1780

1825

Thermal expansion @25℃,×10-6/℃  

a

1.5

a

4.43

b

7.3

b

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 Wavelength

1064.3nm,1342.0nm      

1062.9nm,1340nm      

1064.2nm,1338.2nm      

Emission bandwidth
(linewidth at 1064 nm)

0.8nm

No data

0.45nm

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

Radioactive lifetime (microseconds)
at 1% Nd doping

~100μs

~95μs

230μs

Pump wavelength

808.5nm

808.4nm

807.5nm

Peak pump absorption at 1% doping

~41 cm-1

~57 cm-1

/

Thermal conductivity, W/m/K

5.1

11.7

14

Doping concentration range

0.1-3.0%

0.1-3.0%

0.1-2.0%

 

CASTECH Warranty on Nd:GdVO4 Specifications:  

   ? Wavefront Distortion:<λ/4 @ 633nm;
      ? Dimension Tolerance:(W±0.1mm)x(H±0.1mm)x(L+0.2/-0.1mm);
      ? Clear aperture: >90%;
      ? Flatness: λ/8 @ 633 nm, λ/4 @ 633nm for thickness less than 2mm;
      ? Scratch/Dig code: 10/5 to MIL-PRF-13830B;
      ? Parallelism: <20″;
      ? Perpendicularity: <5′;
      ? Angle Tolerance:<±30′
 .

 

 

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