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关 键 词：Nd:YVO4
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发布时间：2009-05-21
Nd:YVO4 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. -------------------------------------------------------------------------------- Capabilities: Nd dopant: 0.27%, 0.3%, 0.4%, 0.5%, 0.7%, 1.0%, 2.0%, 3.0% Width x Height: 1x1 ~ 16x16mm Length: 0.02 ~ 20mm Specifications: Orientation: a-cut( ± 0.5° ) Dimensional Tolerance: +/-0.1mm Wavefront Distortion: <λ/8 at 633nm Surface Quality: 20/10 Parallelism: < 10 arc seconds Perpendicularity: < 5 arc minutes Surface Flatness: <λ/10 at 632.8nm Clear Aperture: Central 95% Chamfer: 0.15x45° Coating: 1.AR@1064nm R<0.1% 2.AR@1064nm R< 0.1% & HT@808nm T>95% 3.HR@1064nm R>99.8% & HR@532nm R>99% & HT@808nm T>95% Properties: Atomic Density ~1.37x1020 atoms/cm2 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 aa=4.43x10-6/K, ac=11.37x10-6/K Thermal Conductivity Coefficient ||C: 5.23 W/m/K; ^C: 5.10 W/m/K Lasing Wavelengths 914nm, 1064 nm, 1342 nm Crystal Class 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 Optical Coefficient dna/dT=8.5x10-6/K, dnc/dT=3.0x10-6/K Stimulated Emission Cross-Section 25.0x10-19 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 Intrinsic Loss Less 0.1% cm-1 , @1064 nm Gain Bandwidth 0.96 nm (257 GHz) @ 1064 nm Polarized Laser Emission p parallel to optic axis (c-axis) Diode Pumped Optical to Optical Efficiency > 60% Sellmeier Equation (for pure YVO4 crystals) no2=3.77834+0.069736/(l2 - 0.04724) - 0.0108133l2 no2=4.59905+0.110534/(l2 - 0.04813) - 0.0122676l2
