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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 crystals have no phase transition at room temperature and no depolarization in practical
applicatons. KNSBN and SBN crystals have been successfully 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.
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Physical Properties
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|
|
|
| |
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 |
e11~360
e32 ~120 |
500
340 |
450
900 |
| Piezoelectric coefficient
(m/v) |
d33~270
d15~400 |
---
--- |
130
140 |
| Optical index |
no~2.31
ne ~2.28 |
2.3117
2.2987 |
2.3123
2.2733 |
| Transmission
Electrooptical coefficient(pm/v) |
Y |
1340
40
|
420
42
--- |
|
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Photorefractive
Parameters
|
| |
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 months |
--- |
| Holographic response time(ms) |
--- |
<200 |
--- |
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