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Collinear Bragg diffraction in photorefractive Bi(12)SiO(20).

J P Huignard, B Ledu

|August 29, 2009

Summary

Researchers achieved collinear Bragg diffraction in photorefractive bismuth silicon oxide (Bi(12)SiO(20)) crystals using multiple wavelengths. This method enables quasi-nondestructive readout of phase-volume gratings with different light sources.

Area of Science:

Optics and Photonics
Materials Science
Nonlinear Optics

Background:

Photorefractive materials like Bi(12)SiO(20) (BSO) are crucial for holographic data storage and optical processing.
Bragg diffraction typically relies on a single wavelength for efficient light scattering.
Previous methods often involve destructive readout or complex setups for multi-wavelength applications.

Purpose of the Study:

To demonstrate collinear Bragg diffraction in BSO crystals using two different wavelengths for writing and readout.
To explore the generation of new grating wave vectors through nonlinear interactions.
To enable quasi-nondestructive readout of phase-volume gratings.

Main Methods:

Utilizing two independent, collinear writing beams at different wavelengths (λ1 = 632.8 nm, λ2 = 514.5 nm) to create grating wave vectors K1 and K2.

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Exploiting nonlinearities in the photorefractive medium to generate new grating wave vectors (KNL = mK1 ± nK2).

Achieving Bragg diffraction at a specific readout wavelength (λR = 840 nm) determined by the writing wavelengths and nonlinear interactions.

Main Results:

Successfully demonstrated collinear Bragg diffraction in BSO crystals with distinct writing and readout wavelengths.
Generated new grating wave vectors through nonlinear photoinduced space-charge field effects.
Achieved quasi-nondestructive readout of a phase-volume grating at 840 nm, distinct from the recording wavelengths.

Conclusions:

Collinear Bragg diffraction using multiple wavelengths is feasible in photorefractive BSO crystals.
The nonlinear generation of grating wave vectors allows for flexible readout conditions.
This technique offers a pathway for quasi-nondestructive readout in holographic applications.