YVO4(钒酸钇)

YVO4(钒酸钇)


YVO4(钒酸钇)单晶是一种具有优良物理光学性能的双折射晶体材料。该晶体透光范围宽,透过率高、双折射系数大、并易于加工。因此,YVO4晶体被广泛应用于光纤通信领域,是光通信无源器件如光隔离器、旋光器、延迟器、偏振器中的关键材料。

 YVO4 和其他双折射晶体的基本特性比较

  YVO4  TiO2  CaCO3  LiNbO3 
Thermal Expansion ( /°C) c-axis  11.4x10-6  9.2x10-6  26.3x10-6  16.7x10-6 
a-axis  4.4x10-6  7.1x10-6  5.4x10-6  7x10-6 
Refractive Index  n 1.9447@1550nm  2.454@1530nm  1.6346@ 1497nm  2.2151@ 1440nm 
n 2.1486@1550nm  2.710@1530nm  1.4774@ 1497nm  2.1413@ 1440nm 
Birefringence(ne-no)  0.2039@1550nm  0.256@1530nm  -0.1572@ 1497nm  -0.0738@ 1440nm 
Mohs Hardness  5 6.5 3 5
Deliquescence  None  None  Weak  None 
Transparency range  0.4-5mm  0.4-5mm  0.35-2.3mm  0.4-5mm 

基本特性

Transparency Range High transmittance from 0.4 to 5mm
Crystal Symmetry Zircon Tetragonal, space group D4h
Crystal Cell a=b=7.12 Å, c=6.29 Å
Density 4.22 g/cm3
Mohs Hardness 5, glass-like
Hygroscopic Susceptibility Non-hygroscopic
Thermal Expansion Coefficient aa = 4.43 x 10-6/K; ac = 11.37 x 10-6/K
Thermal Conductivity Coefficient ∥C: 5.23 W/m/K; ⊥ C: 5.10 W/m/K
Crystal Class Positive uniaxial with no=na=nb, ne=nc
Refractive Indices, Birefringence (Dn = ne - no) and Walk-off Angle at 45º (r) no = 1. 9929, ne = 2.2154, △n = 0.2225, ρ = 6.04°  at 0.63 μm
no = 1.9500, ne = 2.1554, △n = 0.2054, ρ= 5.72°   at 1.30 μm
no = 1.9447, ne = 2.1486, △n = 0.2039, ρ= 5.69°   at 1.55 μm
Sellmeier Equation  no2= 3.77834 + 0.069736/(λ2 - 0.04724) - 0.0108133λ2
(λ in μm) ne2=4.59905 + 0.110534/(λ2 - 0.04813) - 0.0122676λ2

应用

YVO4 crystal are widely used in fiber-optic islolators,beam displacers for fiber optical circulators, etc.

 Aperture   1.0 x 1.0 mm2 to 4 x 4 mm 
 Dimension tolerance   +/-0.05mm 
 Wedge Angle tolerance   +/-0.1° 
 Optical axis orientation   +/-0.5°  
 Flatness  Lambda/4 @ 632.8 nm 
 Surface Quality   S/D 20-10 
AR-coating   R<0.2% @1550 or 1310nm 
 Standard Size  1.25mmx1.25mmx0.5mm with 13° or 15° wedge,phi=22.5°  

Circulator

YVO4 Beam Displacer for Circulator

加工能力

常规精度等级
尺寸公差 ±0.05mm
面形 ≤lambda/ 4 @ 633nm
波前畸变 ≤lambda/ 4 @ 633nm
表面光洁度 Scratch and Dig 20-10
光束背离 < 3 arc minutes
通光孔径 > 80%
镀膜 根据客户的要求