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Lithium
Niobate crystals ( LiNbO3)
1.
Applications:
LiNbO3
crystal series are widely used ferroelectric
crystals, properties of which can be altered by doing to meet various
applications. The superior properties includes:
* High
electro – optical coefficient.
* High
acousto-optical figure of merit
* High
nonlinear optical coefficient.
* Remarkable
photorefraction.( Fe;LN)
*
Anti-photorefraction (Mg:LN)
*
Piezoelectricity and related effects.
It is mainly
used in the field of
* Optical
waveguide devices:Electro-optical modulators and
switches,Acousto-optical modulators, Waveguide SHG
* Optical
parametric oscilation ( wavelength range IR)
* SHG of
Nd.;YAG laser ( Mg:LN)
* Self SHG
laser (λ= 0.53
μm, Nd.;Mg;LN,
Er:Yb:LN)
*
Optical information holographic memory ( Fe:LN)
Surface acoustic
wave ( SAW) devices z.B filter in TV set. (LN)
2.
Main propertiyes:
|
Crystal system |
Trigonal |
|
Point group |
3m |
|
Tranparency range |
0.4 – 4.5
μm |
|
Refractive index |
no=2.286
(λ= 0.633
μm
)
ne
=2.200 |
|
Electro-optical |
(T) r13=9.6 (S) r13=8.6
(λ= 0.633
μm
) |
|
Coefficient (pm/v) |
r22=6.8
r22=3.4
r33=30.9
r33=30.8
r51=32.6
r51=28 |
|
Acousto-optical
Figure of merit |
M2
= n6p2/V3=6.99 |
|
Nonlinear optic;
Coefficient (pm/V) |
d31
= -5.9 (λ= 1.064
μm
)
d33
= -33.9
d22
= 4.0 |
3.Specifications
* Pure LN
wafer for SAW devices
Diameter 76.2
mm x 0.3 – 1.5 mm
( X-cut,Y-cut or Z-cut)
Diameter 50.8
mm x 0.3 – 1.5 mm
( X-cut,Y-cut or Z-cut)
* Doped LN
wafer for Nd:Mg;LN or Er;LN,Er:Mg:LN
waveguide
laser X-cut or Z-cut
12x13x1.5/15x25x1.5/20x35x1.5 mm3
* Electro-optical modulators; 7x7x20 mm ,9x9x25 mm
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