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Potassium Sodium Strontium Barium Niobate (KNSBN) andStrontium Barium Niobate (SBN) are promisingphotorefractive crystals that will be widely used in optical informationprocessing, optical computing and optical network system. KNSBN crystals which were developed in CORETECH for the first time have no phase transition at roomtemperatureand no depolarization in practical usage. KNSBN and SBN crystals havebeen used torealize image amplification, imaginary holographic storage,self-pumped phase conjugation(SPPC), image edge detect (image differentiation),strain detect of materials and distorted image correction successfully.
Dimension tolerance:                          ±0.05mm
Flatness:                                              λ/4 @633nm
Scratch/Dig:                                        10/5(MIL-PRF-13830B)
Parallelism:                                          better than 20 arc sec
Perpendicularity:                                 better than 15 arc min
Orientation tolerance:                          △ <+/- 0.5°
Coating:                                               AR: R<0.2%@633nm, 1310nm, 1550nm
Clear aperture:                                    >90% central area
Transmitting wavefront distortion:       less than λ/4 @ 633nm

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