YVO4 is a excellent birefengent 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 = 2.583
he = 2.865
a : -0.72
c : -0.42
Tetragonal
a = 4.593
c = 2.958
1840 4.26 7 a : 7.14
c : 9.19
 
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