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Photorefractive effects

Petr Tišer Vedoucí projektu: Ing. Petr Hříbek, CSc.; RNDr. Milan Durchan , CSc. Petr Tišer. Photorefractive effects. Photorefractive effects. Project leaders : Ing.Petr Hříbek,CSc., RNDr. Milan Durchan CSc. 26.7.2011. Motivation.

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Photorefractive effects

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  1. Petr Tišer Vedoucí projektu: Ing. Petr Hříbek, CSc.; RNDr. Milan Durchan, CSc. Petr Tišer Photorefractiveeffects Photorefractiveeffects Project leaders: Ing.Petr Hříbek,CSc., RNDr. Milan Durchan CSc. 26.7.2011

  2. Motivation • Highresolutionimaging by photorefractiveeffect – photorefractivemicroscope

  3. Content • Stability ofthe table • Photorefractiveeffect • Lightpropagation in thephotorefractivematerials – BaTiO3photorefractivemirror • Non-aberationimaging • Photorefractivemicroscope • Conclusion

  4. MichelsoninterferometerHe-Ne laser (λ = 632.8nm) Interference fringepattern

  5. Table sensitivity – interference pictureofsound Snapfingers Frequency 1,738 kHz

  6. Photorefractivematerial BaTiO3 • Photosensitivematerial (generationofelectrons) • Photoconductivematerial (electronsandholesconductivity) • Electro-opticalmaterial (refraction index change by theelectricfield) • Trappingoftheelectrons

  7. Interference field f Originofthephotorefractiveeffect

  8. BaTiO3 photorefractivemirror Non-aberationimaging

  9. Difractionpattern in BaTiO3 1. 2. 3.

  10. Reflectionof He-Ne beam in BaTiO3

  11. Photorefractivemicroscope Test

  12. Memoryof a crystal 2. 1. 100 μm 2.

  13. Crystalof a protein Crystalof salt 30 μm

  14. Crystalsof salt 30 μm

  15. Onioncells 30 μm

  16. Conclusion • Vibrationisolationofthe table • High stability table (Michelsoninterferometer) • BaTiO3photorefractivemirror • Photorefractivemicroscope design andcreation

  17. Thanksforattention

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