Polarization properties of photorefractive diffraction in electrooptic and optically active sillenite crystals (Bragg regime)

Marrakchi, A.; Johnson, Richard V.; Tanguay, Armand R.

doi:10.1364/josab.3.000321

Cited by 174 publications

(46 citation statements)

References 32 publications

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“…The polarization of the light input beams is linear and oriented to be at 45°to the ͓001͔-axis in the middle slice of the sample; this orientation prevents practically any change in the linear state of polarization due to the induced birefringence and results in parallelpolarized transmitted and diffracted beams at the crystal outputs. 34 In the example illustrated in Fig. 4, V ͑t͒ = V ⌬ sin͑⍀t͒ V, with ⍀ / 2 = 1 Hz and V ⌬ = 2.0 V ͓solid curve in Fig.…”

Section: Resultsmentioning

confidence: 99%

Oscillating holograms recorded in photorefractive crystals by a frequency detuned feedback loop

Freschi

Telles

Frejlich

et al. 2009

Journal of Applied Physics

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We report an optoelectronic feedback loop suitable for generating noise-free interference patterns oscillating at arbitrary waveforms. The technique allows controlling the frequency detuning between the interfering beams through a phase modulator in a closed-loop interferometer. We use the dither signal method and propose a quasisynchronous demodulation scheme to create a phase modulated error signal for driving the loop. The dynamics of the interference fringes is easily controlled by a voltage waveform from a function generator, which is used in association with a time delay circuit for shifting the frequency of the reference signal used for lock-in demodulation. The technique is specially suited for applications involving low-frequency phase oscillations, such as those frequently encountered in the generation of space-charge waves in highly resistive photorefractive materials. The processing scheme allows real time monitoring of the hologram strength, and absolute values for the diffraction efficiency and the holographic phase shift can be obtained. Photorefractive wave oscillations ranging from approximately 100 mHz to 10 Hz were produced in a nominally undoped Bi 12 TiO 20 sample. The technique can be readily applied to other fields of optical interferometry, such as for testing optical surfaces, optimizing adaptive holographic devices, measuring physical quantities, among other applications.

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Section: Resultsmentioning

confidence: 99%

Oscillating holograms recorded in photorefractive crystals by a frequency detuned feedback loop

Freschi

Telles

Frejlich

et al. 2009

Journal of Applied Physics

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“…(5) because it does not change the polarization characteristics of the diffracted wave and decreases the diffraction efficiency only by a factor exp(-az), where a is the absorption coefficient. 5 As is well known (see, e.g., Refs. 14 and 15), there are several methods for the description of a polarization state: the polarization matrix, the Stokes parameters, representation by a complex number, the Jones vector, and specification by ellipticity and inclination angle.…”

Section: (5) Dzmentioning

confidence: 93%

“…(5) is only a reformulation of the standard equations given in Ref. 5. Technical details can be found in Ref.…”

Section: (5) Dzmentioning

confidence: 99%

“…2 shows the relation between points of the complex W plane and the polarization properties.' 5 Let the solution of Eqs. (5) have the form…”

Section: (5) Dzmentioning

confidence: 99%

“…1, this system is well known. 5 Usually the solution is found either numerically 5 ' 6 or in the limit of a thin crystal with a small grating amplitude. 7 ' 8 We have succeeded in finding an exact and sufficiently simple solution to the problem of Bragg diffraction from gratings in sillenite crystals for both optical configurations.…”

Section: Introductionmentioning

confidence: 99%

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Exact solution of the Bragg-difEraction problem in sillenites

et al. 1994

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A method for the exact solution of the Bragg-diffraction problem for a photorefractive grating in sillenite crystals based on Pauli matrices is proposed. For the two main optical configurations explicit analytical expressions are found for the diffraction efficiency and the polarization of the scattered wave. The exact solution is applied to a detailed analysis of a number of particular cases. For the known limiting cases there is agreement with the published results.

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2020

Photorefractive Materials for Dynamic Optical Recording

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Polarization properties of photorefractive diffraction in electrooptic and optically active sillenite crystals (Bragg regime)

Cited by 174 publications

References 32 publications

Oscillating holograms recorded in photorefractive crystals by a frequency detuned feedback loop

Oscillating holograms recorded in photorefractive crystals by a frequency detuned feedback loop

Exact solution of the Bragg-difEraction problem in sillenites

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