Nd:YVO4
Physical and Optical Properties
Chemical formula...........................................................................................Nd:YVO4
Crystal structure................................................Zircon Tetragonal, space group D4h
Density.....................................................................................................4.22 g/cm3
Mohs hardness.....................................................................................Glass-like, ~5
Thermal conductivity Coefficient............................||C: 5.23 W/m/K; ^C: 5.10 W/m/K
Thermal Expansion Coefficient..............................aa=4.43x10-6/K, ac=11.37x10-6/K
Lasing Wavelength..........................................................914nm, 1064 nm, 1342 nm
Absorption range.............................................................................................808nm
Lattice constants............................................................................a=b=7.12, c=6.29
Fluorescence lifetime.........90 msec (about 50 m s for 2 atm% Nd doped) @ 808 nm
Absorption Coefficient...............................................................31.4 cm -1 @ 808 nm
Refractive index.................................................no =1.9573, ne =2.1652 @ 1064nm
Polarized Emission.........................................................parallel to optic axis (c-axis)
Typical Specification and Tolerance
conentration.............................................0.2 ~ 3 atm% Nd dopant (10% tolerance)
Aperature...................................................................................................1 ~ 20mm
Path Length...........................................................................................0.02 ~ 20mm
End configuration.............................flat/flat or Brewster/Brewster ends or Specified
Orientation........................................................a-cut crystalline direction (+/-0.5°C)
parallelism.....................................................................................<λ/10 arc seconds
Surface quality.................................better than 20/10 Scratch/Dig per MIL-O-1380A
Surface flatness..............................................................................<λ/10 at 632.8nm
Wavefront distortion............................................................................<λ/8 at 633nm
Perpendicularity..................................................................................< 5 arc minutes
Clear aperture.........................................................................................Central 95%
Chamfer........................................................................................................0.15x45°
Damage threshold...over 15J/cm2 (rods without coating),over 700MW/cm2 (coating)
Coatings:
a)............................................................................................AR@1064nm,R<0.1%
b)...........................................................AR@1064nm,R<0.1%; HT@808nm,T>95%;
c)..........................................................HR@1064nm,R<99.8%; HT@808nm,T>95%;
d).........................HR@1064nm,R<99.8%; HT@808nm,T>95%; HR@532nm,R>99%;
