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关 键 词：双折射晶体
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发布时间：2009-05-21
The yttrium orthovanadate (YVO4) is a positive uniaxial crystal grown with Czochralski method. It has good mechanical and physical properties and is ideal for optical polarizing components because of its wide transparency range and large birefringence. It is an excellent synthetic substitute for Calcite (CaCO3) and Rutile (TiO2) crystals in many applications including fiber optic isolators and circulators, beam displacers, Glan polarizers and other polarizing optics, etc. -------------------------------------------------------------------------------- Specifications: Diameter: Max 25m Length: Max 35mm Surface Quality: better than 20/10 scratch/dig Beam Deviation: < 3 arc min Optical Axis Orientation: +/-0.2deg Flatness: < l/4 @632.8nm Wavefront Distortion: < l/2 @632.8nm Coating: Coating upon Request Properties: Transmitting range 400~5000nm Crystal Symmetry Zircon tetragonal, space group D4h Crystal Cell a=b=7.12 °, c=6.29 ° Density 4.22 g/cm2 Hygroscopic Susceptibility Non-hygroscopic Mohs Hardness 5 glass like Thermal Optical Coefficient Dna /dT=8.5x10-6 /K; dnc /dT=3.0x10-6 /K Thermal Conductivity Coefficient ||C: 5.23 w/m/k; ⊥C:5.10w/m/k Crystal Class Positive uniaxial with no=na=nb, ne=nc Refractive Indices, no=1.9929, ne=2.2154, Dn=0.2225, ρ=6.04°, at 630nm Birefringence( Dn=ne-no) no=1.9500, ne=2.1554, Dn=0.2054, ρ=5.72°, at 1300nm and Walk-Off Angle at 45 deg(ρ) no=1.9447, ne=2.1486, Dn=0.2039, ρ=5.69°, at 1550nm Sellmeier Equation ( l in mm) no2 =3.77834+0.069736/(l2 -0.04724)-0.0108133l2 ne2 =4.5905+0.110534/(l2 -0.04813)-0.0122676l2
