They can split the extraordinary ray and ordinary ray at certain spacing due to its large birefringence when the angle of incidence is 0 degree. It is often used in circulators and interleavers.
Item
Specifications
Material
YVO4 or TiO2 birefringent crystal
Dimension X×Y×Z
1×1×1mm ~5×5×10mm
Dimension tolerance
±0.02mm
Parallelism
＜10″
Clear Aperture
90%
Surface Quality
MIL 20-10
Flatness
λ/10 ＠632.8nm
Orientation tolerance
±0.1°
Coating on input and output surfaces
R<0.2%@λc±40nm；λc=1310；1550nm…