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YVO4

Birefringent Crystals --------- YVO₄

Undoped YVO₄ crystal is widely used in many beam displace online_orderings because of its

large birefringence. It also has good physical and favorable mechnical properties than thers

birefringent crystals, which make YVO₄ well suited for compact fiber optical components,

such as isolators, circulators and interleaver etc.

DeLn Optics general YVO₄ production capabilities include:

Diameter max. 25mm

Length max. 30mm

Surface Quality better than 2 0/10 scratch/dig Per MIL-0-13830A

Beam Deviation <3 arc min

Optical Axis Orientation +/-0.2°

Flatness < l /4 @633nm

Transimission Wavfront Distortion < l /2 @633nm

Coating upon customer's Specification

Transparency Range 400~5000nm

Crystal Symmetry Zircon tetragonal, space group D4h

Crystal Cell A=b=7.12 °, c=6.29 °

Density 4.22 g/cm ²

Hygroscopic Susceptibility Non-hygroscopic

Mohs Hardness 5 glass like

Thermal Optical Coefficient Dn a /dT=8.5x10^-6 /K; dn c /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, Birefringence( D n=ne-no) and Walk-Off Angle at 45 deg(ρ) N_o=1.9929, ne=2.2154, D _n=0.2225, ρ=6.04°, at 630nm

N_o=1.9500, ne=2.1554, D _n=0.2054, ρ=5.72°, at 1300nm

N_o=1.9447, ne=2.1486, D _n=0.2039, ρ=5.69°, at 1550nm

Sellmeier Equation ( l in m m) n _o 2 =3.77834+0.069736/(l² -0.04724)-0.0108133l²

　

n e ² =4.5905+0.110534/(l² -0.04813)-0.0122676 l²

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