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    4. 福州高特光电科技有限公司

       Nd:YVO4 crystal is one of the most efficient laser host crystal currently existing for diode laser pumped solid state lasers. Its large stimulated emission cross-section at lasing wavelength, high absorption coefficient and wide absorption bandwidth at pump wavelength, high laser induced damage threshold as well as good physical, optical and mechanical properties make Nd:YVO4 an excellent crystal for high power, stable and cost effective diode pumped solid-state lasers.

      Main Features

      Low lasing threshold and high slope efficiency
      Low dependency on pump wavelength
      Large stimulated emission cross-section at lasing wavelength
      High absorption over a wide pumping wavelength bandwidth
      Optically uniaxial and large birefringence emits polarized laser


      Typical 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


      Specifications
       

      Nd Dopant Level0.1 - 5.0 atm%
      Standard Dimensions3x3x3 mm3, 3x3x1 mm3, 3x3x0.5 mm3
      Wavefront Distortionλ/8@ 633nm
      ScatteringInvisible, probed with a He-Ne laser
      Orientation Tolerance±0.5deg
      Dimensional Tolerance±0.1mm
      End-faces ConfigurationPlano/Plano
      Surface Flatnessλ/10 at 633 nm
      Surface Quality10/5 Scratch and Dig
      Parallelism< 10 arc seconds
      Clear Aperture> Central 90%
      Intrinsic Loss< 0.1%cm-1
      Physical Properties

      Atomic Density~1.37x1020 atoms/cm3
      Crystal StructureZircon Tetragonal, space group D4h
      a=b=7.12, c=6.29
      Density4.22 g/cm3
      Mohs HardnessGlass-like, ~5
      Thermal Expansion Coefficienta=4.43x10-6/K, c=11.37x10-6/K

      Optical Properties (typically for 1.1 atm% Nd:YVO4, a-cut crystals)

      Lasing Wavelengths914nm, 1064 nm, 1342 nm
      Thermal Optical Coefficientdna/dT=8.5x10-6/K, dnc/dT=3.0x10-6/K
      Stimulated Emission Cross-Section25.0x10-19cm2 @1064 nm
      Fluorescent Lifetime90us @808 nm, (50us @808 nm for 2atm% Nd doped)
      Absorption Coefficient31.4 cm-1@808 nm
      Absorption Length0.32 mm @808 nm
      Intrinsic LossLess than 0.1% cm-1@1064 nm
      Gain Bandwidth0.96 nm (257 GHz) @1064 nm
      Polarized Laser Emissionp polarization, Parallel to optic axis (c-axis)
      Diode Pumped Optical to Optical Efficiency> 60%
      Crystal ClassPositive 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
      Sellmeier Equation
      (for pure YVO4 crystals, λ in um)
      no2=3.77834+0.069736/(λ2-0.04724) - 0.0108133λ2 ne2=4.59905+0.110534/(λ2-0.04813) - 0.0122676λ2

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