Typical Properties of YVO4 crystal

Crystal Structure

Tetragonal:   a = b = 7.12 Å    c = 6.29 Å

 Growth Method  

Czochralski

Melt Point

1825  ^oC        

Density

4.22   g/cm³  

Hardness

 5  ( mohs)

Thermal Expansion

 a_a= 4.43 x10^-6/ ^oC                a_c= 11.37  x10^-6/ ^oC

Thermal Conductivity,

A axis 5.32 W/(m.k)              C axis = 5.10 W/(m.k)

Thermal Optic Coefficient

dh_a / dT :   8.5x10^-6/ ^oC        dh_c / dT :   3.0 x10^-6/ ^oC

Transmission Range

 ~ 80%  at 400 nm ~ 4000 nm range

Refractive Index  h

Birefringence (Dn) and the walk-off angle at 45° (r)

h_o= 1.9929    h_e= 2.2154    Dh = 0.2225    r=6.04^o    at  l 0.63 mm

h_o= 1.9500    h_e= 2.1554    Dh = 0.2054    r=5.72^o    at  l 1.30 mm

h_o= 1.9447    h_e= 2.1486    Dh = 0.2039    r=5.69^o    at  l 1.55 mm

Sellmeier Equation ( l in mm )

h_o² = 3.77834 + 0.069736/(l² –0.04724) – 0.0108133 ´ l²

h_e² = 4.59905 + 0.110534/(l² –0.04813) – 0.0122676 ´ l²

Standard Products and Specs

As-grown boules

 <100 >  or <001> ori.± 0.5^o

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 45^o, f=0 or 45^o

 3.2 x3.2 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 45^o, f=0 or 45^o

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

AR coating:

R < 0.25% @1550 nm        ( available upon request )