Neodymium-doped yttrium orthovanadate
Neodymium-doped yttrium orthovanadate is a crystalline material formed by adding neodymium ions to yttrium orthovanadate. It is commonly used as an active laser medium for diode-pumped solid-state lasers. It comes as a transparent blue-tinted material. It is birefringent, therefore rods made of it are usually rectangular.
As in all neodymium-doped laser crystals, the lasing action of Nd:YVO4 is due to its content of neodymium ions, which may be excited by visible or infrared light, and undergo an electronic transition resulting in emission of coherent infrared light at a lower frequency, usually at 1064 nm.Basic properties
- Atomic density: ~1.37×1020 atoms/cm3
- Crystal structure:
- *zircon tetragonal
- * space group D4h
- * a=b=7.12, c=6.29
- Density: 4.22 g/cm3
- Mohs hardness: Glass-like, ~5
- Thermal expansion coefficient:
- * αa=4.43×10−6/K
- * αc=11.37×10−6/K
- Thermal conductivity:
- *parallel to C-axis: 5.23 W·m−1·K−1
- *perpendicular to C-axis: 5.10 W·m−1·K−1
Optical properties
- Lasing wavelengths: 914 nm, 1064 nm, 1342 nm
- Crystal class: positive uniaxial, no=na=nb, ne=nc,
- *no=1.9573, ne=2.1652, at 1064 nm
- *no=1.9721, ne=2.1858, at 808 nm
- *no=2.0210, ne=2.2560, at 532 nm
- Fluorescence lifetime as a function of Nd ions concentration:
- Absorption cross-section at 808 nm: 5.5×10−20 cm²
- Emission cross-section at 1064 nm: 30×10−19 cm²
- Polarized laser emission: π-polarization; parallel to optic axis
- Gain bandwidth: 0.96 nm at 1064 nm
- Absorption coefficients at 808 nm for different doping concentrations:
