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laser crystal
optical crystal
Nd:GdVO4
The neodymium-doped gadolinium vanadate crystal (Nd:GdVO₄), a laser crystal, has properties similar to those of Nd:YVO₄. It possesses excellent physical, optical, and mechanical properties and is on..
Product description
The neodymium-doped gadolinium vanadate crystal (Nd:GdVO₄), a laser crystal, has properties similar to those of Nd:YVO₄. It possesses excellent physical, optical, and mechanical properties and is one of the ideal laser working substances for laser diode-pumped all-solid-state (DPSS) micro-lasers. Nd:GdVO₄ has a higher slope efficiency than Nd:YAG, as well as better thermal conductivity and higher output power compared to Nd:YVO₄. Therefore, in high-power DPSS applications, Nd:GdVO₄ also performs better.
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Main Advantages:
- Large stimulated emission cross-section.
- High absorption coefficient and wide absorption bandwidth.
- Low dependence on the pumping wavelength.
- Good thermal conductivity.
- Low laser threshold and high laser output slope efficiency.
- High laser damage threshold.
- Good polarization of the laser output.
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Crystal Structure
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Tetragonal crystal system, space group I4₁/amd
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Unit Cell Parameters
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a = 7.21 Å, c = 6.35 Å
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Energy Level Transition
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4F₃/₂ → 4I₁₁/₂
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Laser Wavelength
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1062.9 nm
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Emission Cross-Section (at 1064nm)
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7.6×10⁻¹⁹ cm²
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Absorption Cross-Section (at 808nm)
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4.9×10⁻¹⁹ cm²
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Absorption Coefficient (at 808nm)
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74 cm⁻¹
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Refractive Index (at 1064nm)
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nₒ = 1.972, nₑ = 2.192
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Thermal Conductivity <110>
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11.7 W/m/K
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Density
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5.47 g/cm³
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Nd Doping Concentration (at.%)
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0.1%, 0.2%, 0.3%, 0.5%, 0.7%, 1.0%...
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Crystal
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Nd:GdVO₄
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Nd:YVO₄
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Crystal Structure, Space Group
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Tetragonal crystal system, I4₁/amd
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Tetragonal crystal system, I4₁/amd
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Unit Cell Parameters
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a = 7.21 Å, c = 6.35 Å
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a = 7.21 Å, c = 6.29 Å
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Melting Point (℃)
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1780
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1825
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Coefficient of Thermal Expansion @ 25 ℃, × 10⁻⁶ /℃
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a
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1.5
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a
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4.43
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c
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7.3
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c
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11.4
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Specific Heat @ 25 ℃, cal/mol•K
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32.6
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24.6
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dn/dT, × 10⁻⁶ /℃
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4.7
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2.7
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Crystal
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Nd:YVO₄
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Nd:GdVO₄
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Nd:YAG
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Laser Wavelength
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1064.3 nm, 1342.0 nm
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1062.9 nm, 1340 nm
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1064.2 nm, 1338.2 nm
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Emission Bandwidth
(Spectral Line Width at 1064 nm)
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0.8 nm
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None
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0.45 nm
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Effective Emission Cross-Section
(at 1064 nm)
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15.6×10⁻¹⁹ cm²
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7.6×10⁻¹⁹ cm²
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6.5×10⁻¹⁹ cm²
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Polarization
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Parallel to the c-axis
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Parallel to the c-axis
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Unpolarized
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Radiative Lifetime
(1% Nd Doping Concentration)
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~100 μs
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~95 μs
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~230 μs
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Pumping Wavelength
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808.5 nm
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808.4 nm
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807.5 nm
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Peak Pumping Absorption at 1% Doping Concentration
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~41 cm⁻¹
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~57 cm⁻¹
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None
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Thermal Conductivity
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5.1 W/m/K
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11.7 W/m/K
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14 W/m/K
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Doping Concentration Range
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0.1 - 3.0%
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0.1 - 3.0%
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0.1 - 2.0%
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Product Specifications of Nd:GdVO₄ Crystal:
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Size Tolerance
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(W ± 0.1 mm) × (H ± 0.1 mm) × (L + 0.2 / -0.1 mm)
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Effective Aperture for Light Transmission
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The central 90% area
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Flatness
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≤λ/8 @ 633 nm (L ≥ 2.5 mm)
≤λ/4 @ 633 nm (L < 2.5 mm)
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Surface Finish
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10/5, Refer to MIL-PRF-13830B standard
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Transmission Wavefront Distortion
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≤λ/4 @ 633 nm
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Parallelism
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20"
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Perpendicularity
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≤ 15'
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Chamfer
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≤ 0.2 mm × 45°
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Edge Chipping
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≤ 0.1 mm
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Angle Tolerance
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≤ 0.5°
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AR Anti-Reflection Coating
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R < 0.2% @ 1064 nm
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HR High-Reflection Coating
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R > 99.8% @ 1064 nm, T > 95% @ 808 nm
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Quality Assurance Period
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One year (under normal use)
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