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

2. Motivation High resolution imaging by photorefractive effect
– photorefractive microscope

3. Content Stability of the table Photorefractive effect
Light propagation in the photorefractive materials – BaTiO3 photorefractive mirror
Non-aberation imaging
Photorefractive microscope
Conclusion

4. Michelson interferometer He-Ne laser (λ = 632.8nm)
Interference fringe pattern

5. Table sensitivity – interference picture of sound
Snap fingers
Frequency 1,738 kHz

6. Photorefractive material BaTiO3
Photosensitive material (generation of electrons)
Photoconductive material (electrons and holes conductivity)
Electro-optical material (refraction index change by the electric field)
Trapping of the electrons

7. Interference field f
Origin of the photorefractive effect

8. BaTiO3 photorefractive mirror
Non-aberation imaging

9. Difraction pattern in BaTiO31. 2. 3.

10. Reflection of He-Ne beam in BaTiO3

11. Photorefractive microscope
Test

12. Memory of a crystal 2. 1.
100 μm 2.

13. Crystal of a protein
Crystal of salt
30 μm

14. Crystals of salt
30 μm

15. Onion cells
30 μm

16. Conclusion Vibration isolation of the table
High stability table (Michelson interferometer)
BaTiO3 photorefractive mirror
Photorefractive microscope design and creation

17. Thanks for attention