YVO4晶体(钒酸钇)是用提拉法生长的单轴晶体。它具有良好的机械和物理性能,由于其较宽的透过范围和较大的双折射,并易于加工,是光学偏振器件的理想选择。YVO4双折射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、环形器,旋光器、延迟器、偏振器中的关键材料,同时在光束位移器,格兰偏振器和其他偏振光学器件等许多应用中都是方解石(CaCO3)和金红石(TiO2)晶体的优良合成替代品。
YVO4晶体基本特性:
透光范围 |
高透光率0.4-5 μm |
晶体匀称性 |
四方锆石, 空间群D4h |
晶格参数 |
a=b=7.12A;c=6.29A |
密度 |
4.22 g/cm3 |
莫氏(Mohs)硬度 |
5, 近似玻璃 |
潮解性 |
不潮解 |
热膨胀系数 |
αa=4.43x10-6/K;αc=11.37x10-6/K |
热传导系数 |
//C:5.23 W/m/K;⊥C:5.10 W/m/K |
晶系 |
正单轴晶体 no=na=nb,ne=nc |
热光系数 |
dna/dT=8.5x10-6/K;dnc/dT=3.0x10-6/K |
折射系数,双折射系数(△n=ne-no), |
no=1.9929,ne=2.2154,△n=0.2225,ρ=6.04°
at 0.63mm |
塞米尔(Sellmeier)方程(λ用μm表示): |
no2=3.77834+0.069736/(λ2-0.04724)-0.0108133λ2 |
YVO4晶体的具体应用:
YVO4晶体主要用来制造光隔离器的双折射楔角片,以及光环形器和光分束器的厚片BD。
1. 光纤隔离器用双折射楔角片规格
孔径 |
1.0x 1.0mm2 to 4x4mm2 |
尺寸公差 |
+/-0.05mm |
楔角公差 |
+/-15% |
光轴方位角 |
+/-0.5° |
平面度 |
λ/4 @ 632.8 nm |
表面质量 |
20-10 |
防反射镀膜 |
R<0.2% @1550 or 1310nm |
标准尺寸 |
1.25mmx1.25mmx0.5mm with 13° 或 15° 楔角, |
2.光环形器和光分束器用YVO4
尺寸公差 |
W(+/-0.05mm)xH(+/-0.05mm)xL(+/-0.1mm)or(+/-0.003mm) |
光轴方位角 |
+/-0.5° |
平行度 |
<15 arc sec |
垂直度 |
<10 arc min |
平面度 |
λ/4 @ 632.8nm |
表面质量 |
20/10 |
防反射镀膜 |
R<0.2% @1550 or 1310nm +/-40nm |
标准尺寸 |
2.6x2.6x10mm, θ=45°,φ=0° |
备注:其他尺寸和规格可根据要求定制。
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. Photonchina YVO4 has 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.
Photonchina YVO4 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 |