Fe:LiNbO3 crystal is one of the most popular photorefractive materials
due to it’s high photorefractive sensitivity, excellent EO and chemo-mechanical
properties, availability in large sizes at moderate cost. This opens the way
for wide application of Fe:LiNbO3 both in R&D and practical devices for
holographic storage, optical memories and information processing.
ELAN offers Fe:LiNbO3 elements fabricated to customer’s specifications
of fully poled, high optical quality crystals grown by Czochralsky method. Wide
of available dopant levels enables to adjust material properties to specific
( mol.% Fe2O3 in the melt )
|0.005; 0.02; 0.05; 0.1 (other on request)
|Melting point , °C
||1255 (Tc=1140 )
|Transparency range, nm
||0.35 – 5.5
|Refractive Index at lambda=0.63
|ElectroopticalCoefficient ,pm/V (at lambda=0.63
||32 (r33) 6.8 (r22)
( low frequency)
- Crystals are grown from congruent melt.
- Finished elements are available
in sizes (3–20)x(3–20)x(3–20) mm3.Wafers with dia. up to 40 mm, or 30x30
mm square, 0.5 - 5.0 mm thick are available.
- Polish standard: 20/10
S/D, lambda/4 flatness, parallelism < 2’
- Coatings available:
a) AR @ 514 nm, 532 nm or other on request
b) ITO conductive/transparent coatings
- Optical absorption in Fe:LiNbO3 strongly depends on doping level and
wavelength. For standard concentration of 0.05% it is near 1 cm-1 at
532 nm but it can be additionally adjusted in some limits by annealing
process in proper atmosphere due to change relative concentrations of
Fe2+ and Fe3+ ions in the LiNbO3 matrix.
- Standard orientations: Z-cut, 45 deg. cut and 90 deg. cut.
Other orientations are available on request.
- Other photorefractive crystals available from ELAN: BGO, BSO, BTO,
Fe:Ti:LiNbO3, Fe:Ti:Ce:LiNbO3, crystals for UV
LiIO3, undoped LiNbO3).