Photorefractive effects

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Presentation transcript:

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. 26.7.2011

Motivation High resolution imaging by photorefractive effect – photorefractive microscope

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

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

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

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

Interference field f Origin of the photorefractive effect

BaTiO3 photorefractive mirror Non-aberation imaging

Difraction pattern in BaTiO3 1. 2. 3.

Reflection of He-Ne beam in BaTiO3

Photorefractive microscope Test

Memory of a crystal 2. 1. 100 μm 2.

Crystal of a protein Crystal of salt 30 μm

Crystals of salt 30 μm

Onion cells 30 μm

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

Thanks for attention