Polar Beam Technologies Inc.

YVO₄ has good mechanical and physical properties and is ideal for optical polarizing components because of its wide transparency range and large birefringence. It has many applications including fiber optics isolators and circulators, beam displacers, glan polarizers and other polarizing optics, etc.

Crystal Class:

Positive uniaxial with no=na=nb,ne=nc

Transparency Range:

0.4 to 5 μm

Crystal Symmetry:

Zircon Tetragonal, space group D4h

Mohs Hardness:

5, glass-like

Hygroscopic Susceptibility:

Non-hygroscopic

Thermal Expansion Coefficiet:

α a =4.43x10^-6/K;α c =11.37x10^-6/K

Thermal Conductivity Coefficient:

//C:5.23 W/m/K; ⊥ C:5.10 W/m/K

Thermal Optical Coefficient:

dna/dT=8.5x10^-6/K;dnc/dT=3.0x10^-6/K

Refractive Indices, Birefringence
( Δn = ne - no ) and Walk-off
Angle at 45°( r ):

0.63mm ne=2.2154, no=1.9929 Δn=0.2225 r=6.04 °
1.30mm ne=2.1554, no=1.9500 Δn=0.2054 r=5.72 °
1.55mm ne=2.1486, no=1.9447 Δn=0.2039 r=5.69 °

Sellmeier Equation (l in mm):

n_o² = 3.77834 + 0.069736/(l² - 0.04724) - 0.0108133l²
n_e² = 4.59905 + 0.110534/(l² - 0.04813) - 0.0122676l²

Surface Quality:

20/10 Scratch and Dig

Beam Deviation:

<20arc second

o and e Beam Angle:

<10 arc secondes

Orientation:

±0.2°

Flatness:

λ/4 @ 632.8 nm

Transmission Wavefront Distortion:

<λ/2 @632.8 nm

AR-coating:

R<0.5%