| Potassium Sodium Strontium Barium Niobate (KNSBN) and Strontium Barium Niobate (SBN) are promising photorefractive crystals that will be widely used in optical information processing, optical computing and optical network system. KNSBN and SBN crystals have been used to realize image amplification, imaginary holographic storage, self-pumped phase conjugation (SPPC), image edge detect (image differentiation), strain detect of materials and distorted image correction successfully. |
|
KNSBN |
SBN(75) |
SBN(60) |
|
|
Point group |
4mm |
||
|
Curie temperature ℃ |
150-250 |
40 |
80 |
|
Spontaneous polarization |
～ 30×10-12c/m2 |
17×10-12c/m2 |
|
|
Dielectric constant |
|||
|
ε 11 |
～ 360 |
500 |
450 |
|
ε 32 |
～ 120 |
340 |
900 |
|
Piezoelectric coefficient (m/v) |
|||
|
d33 |
～ 270 |
__ |
130 |
|
d15 |
～ 400 |
__ |
40 |
|
Optical index |
|||
|
no |
～ 2.31 |
2.3117 |
2.3123 |
|
ne |
～ 2.28 |
2.2987 |
2.2733 |
|
Transmission |
400-5000nm |
400-5000nm |
400-5000nm |
|
Electrooptical coefficient (pm/v) |
|||
|
γ 33 |
～ 270 |
1340 |
420 |
|
γ 51 |
～ 400 |
40 |
42 |
|
γ 13 |
66 |
| KNSBN:Cu | KNSBN:Co | KNSBN:Ce | |
| Two-wave coupling gain(cm-1) | 20 | 15 | |
| Wavelength | 450-700nm | ||
| Sensitivity (cm2/J) | 10-3 | 10-3 | 10-4 |
| SPPC reflectivity(%) | 30-68 | 20-70 | 20-45 |
| SPPC response time (s) | <10 | <20 | <20 |
| Resolution (line pair/mm) | >30 | >20 | --- |
| Storage time | 1-2 monthes |