KNSBN and SBN Crystal

Crystals >>> Photorefractive Crystals >>>  KNSBN and SBN Crystal

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.  

Physical Properties  
  KNSBN SBN(75) SBN(60)
Point group 4mm    
Curie temperature 150-250 40 80
Spontaneous polarization ~3010-12c/m2 1710-12c/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
---

 

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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