YVO4 is a new birefringent crystal for fiber optics. YVO4 is an ideal material for optical polarizing components, such as fiber optic isolators, beam displacers, circulators, etc because of its wide transparency range and large birefringence. Its medium hardness renders it particularly amenable to high quality polish and optical finish with ease. MTI Corporation has set up a joint venture with Anhui Optics Research Institute of Chinese Academy of Science, KMT Co. Ltd. located in Hefei, China, and has been producing high quality, low cost YVO4 single crystals and related components since 1997. Depending on customer's choice, we can supply crystal boules (up to 30 mm dia x 35 mm length), as-cut blocks or polished components with or without AR coating. MTI concentrates on crystal business only and has no intention to manufacture fiber optical devices in competition with any of its customers. Therefore MTI is your reliable long-term partner in fiber optics industries.
Typical Properties of YVO4 crystal
Crystal Structure
Tetragonal:a = b = 7.12 Åc = 6.29 Å
Growth Method
Czochralski
Melt Point
1825 oC
Density
4.22 g/cm3
Hardness
5 ( mohs )
Thermal Expansion
•aa = 4.43 x 10-6 / oC •ac = 11.37 x 10-6 / oC
Thermal Conductivity,
•A axis 5.32 W/(m.k) •C axis = 5.10 W/(m.k)
Thermal Optic Coefficient
•dha / dT : 8.5 x 10-6 / oC •dhc / dT : 3.0 x 10-6 / oC
Transmission Range
~ 80% at 400 nm ~ 4000 nm range
Refractive Index h Birefringence (Dn) and walk-off angle at 45° (r)
•ho = 1.9929 he = 2.2154 Dh = 0.2225 r = 6.04o atl 0.63 mm •ho = 1.9500 he = 2.1554 Dh = 0.2054 r = 5.72o atl 1.30 mm •ho = 1.9447 he = 2.1486 Dh = 0.2039 r = 5.69o atl 1.55 mm
20 mm diameter x up to 20 mm length ( We don't suggest you purchase boules unless it is necessary because of the difficulty in quality verification at this stage )
As-cut blocks q=0 or 45o, f=0 or 45o
•3.2 x 3.2 x 10.3 mm •4.2 x 4.2 x 10.3 mm ( or any size available from crystal boule )
Optically polished parts q=0 or 45o, f=0 or 45o 2 sides polished
•Dimension Tolerance : ± 0.05 mm •Orientation Tolerance : ± 0.5 o •Tolerance Parallelism : < 15"for any size upon customer request •Surface Roughness : Epi polished (Ra) < 5A
