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Nd:YVO4 Crystal

         
  Applications For Single-longitudinal-mode output and compact design  
    Diode laser-pumped Nd:YVO4 compact laser and its frequency-doubled green, red or blue laser will be the ideal laser tools of machining, material processing, spectroscopy, wafer inspection, light show, medical diagnostics, laser printing and other most widespread applications  
         
  Features Better choice than Nd:YAG for low-power devices such as hand-held pointers, and others compact lasers  
    As high as about five times larger absorption efficient over a wide pumping bandwidth around 808 nm  (therefore, the dependency on pumping wavelength is much lower and a strong tendency to the single    mode soutput)  
    As large as three times larger stimulated emission cross-section at the lasing wavelength of 1064nm  
    Lower lasing threshold and higher slope efficiency  
    As a uniaxial crystal with a large birefringence, the emission is only a linearly polarized.  
         
         
Main Specification Material Neodymium Doped Yttrium Orthovanadate  
Nd dopant concentration
Dopant tolerance
0.1 - 5.0 atm%  
Diameter 3×3×3 mm3, 3×3×1 mm3, 3×3×0.5 mm3  
Length 0.02 ~ 20mm  
Dimensional Tolerance ±0.1mm  
Coating AR @ 1064nm, R< 0.1% & HT @ 808nm, T>95%
HR @ 1064nm, R>99.8% & HT@ 808nm, T>9%
HR @ 1064nm, R>99.8%, HR @ 532 nm, R>99% & HT @ 808 nm, T>95%
 
Orientation a-cut crystalline direction (+/-5)  
Orientation Tolerance ±0.5deg  
Wavefront Distortion <λ/8 at 633nm  
Surface quality  Scratch/Dig 10/5 Scratch and Dig  
Parallelism < 10 arc sec  
Perpendicularity < 5 arc min  
Surface flatness <λ/10 at 632.8nm  
End-faces Configuration Plano/Plano  
Clear aperture > Central 90%  
Chamfer 0.15×45o  
Damage Threshold over 15J/cm2 (rods without coating)
over 700 MW/cm2 (coating)
 
Physical and Chemical Properties Crystal Structure Zircon Tetragonal, space group D4h-I4/amd
a=b=7.1193A,c=6.2892A
 
Dimensional tolerances +/-0.1mm(typical), 
High precision +/-0.005mm can be available upon request
 
Melting Point 1810 ± 25  
Atomic Density ~1.37×1020 atoms/cm2  
Density/密度 4.22 g/cm3  
Mohs Hardness Glass-like, 4.6 ~ 5  
Refractive Index positive uniaxial, no=na=nb ne=nc
no=1.9573, ne=2.1652, @ 1064nm
no=1.9721, ne=2.1858, @ 808nm
no=2.0210, ne=2.2560, @ 532nm
 
Thermal Expansion Coefficient (300K)
αa=4.43×10-6/K
α
c=11.37×10-6/K
 
Thermal Conductivity //C:0.0523W/cm/K
C:0.0510W/cm/K
 
Optical properties Lasing Wavelength 914nm, 1064 nm, 1342 nm  
Scattering Invisible, probed with a He-Ne laser  
Stimulated Emission Cross Section 25.0×10-19 cm2 , @1064 nm  
Fluorescent Lifetime 90 ms (about 50 ms for 2 atm% Nd doped) @ 808 nm  
Absorption Coefficient 31.4 cm-1 @ 808 nm  
Absorption Length 0.32 mm @ 808 nm  
Polarized Laser Emission parallel to optic axis (c-axis)  
Thermal Optical Coefficient dno/dT=8.5×10-6/K
dn
e/dT=2.9×10-6/K
300K
 
Intrinsic Loss <  0.1% cm-1 , @1064 nm  
Gain Bandwidth 0.96 nm (257 GHz) @ 1064 nm  
Diode Pumped Optical to Optical Efficiency > 60%  
Sellmeier Equation (for pure YVO4 crystals) no2(λ) =3.77834+0.069736/(λ2 - 0.04724) - 0.0108133λ2
no2(λ) =4.59905+0.110534/(λ2 - 0.04813) - 0.0122676λ2
 
Crystal Class Positive uniaxial, no=na=nb, ne=nc,
n
o=1.9573, ne=2.1652, @1064nm
n
o=1.9721, ne=2.1858, @808nm
n
o=2.0210, ne=2.2560, @532nm