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Barium Titanate or BaTiO3 is an excellent
photorefractive crystal for self-pumped phase conjugation, four-wave
mixing and many other photorefractive processes. It has high beam-
coupling
gain and short beam-coupling rise time. The highest SPPC reflectivity was
reported by using BaTiO3. It can be operated at visible and
near-infraced
regions and is good for cw four-wave mixing with milliwatts
optical power.
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Physical and
optical properties:
|
|
| Crystal
structure |
Tetragonal,
4mm |
| Lattice parameters |
a=3.992 Å, c=4.036 Å |
| Density |
6.02g/cm3 |
| Hardness |
5 Mohs |
| Phase
transition temperature |
-90°C, 9°C,
132°C |
| Electro-optic
coefficients |
|
Unclamped |
Clamped |
| r13 |
9.5 pm/v |
8
pm/v |
| r33 |
97
pm/v |
28
pm/v |
| r42 |
1460
pm/v |
820pm/v |
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