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YVO4 is an excellent birefringent crystal for fiber optics applications. As substrate, it can replace TiO2 for lower cost and better quality in many cases
Crystal
Birefr-ingence D=he-ho
Refractive index h at l= 0.63m
Thermooptical Coef.dh/dT 106/K
Structure lattice constant (A)
Melting point oC
Density g/cm3
Hard-ness (Moh)
Thermal Coef. 10-6/K
YVO4
+ 0.222
ho=1.9929 he=2.2154
a: -8.5 c: -3.0
Tetragonal a=7.12 c= 6.29
1825
4.22
5
a: 4.46 c: 11.37
TiO2
+ 0.282
ho=2.583he=2.865
a: -0.72c: -0.42
Tetragonal a=4.593 c=2.958
1840
4.26
7
a: 7.14c: 9.19
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