Influence of the photoelasticity on self-diffraction of light in electrooptic crystals

Kargin, Yu. F.; Kukhtarev, Nickolai V.; Privalko, A. V.; Semenets, T. I.; Шандаров, С. М.; Shepelevich, V. V.

doi:10.1070/qe1991v021n10abeh004302

Cited by 12 publications

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“…(14) It is clear that the second item in last expression describes the contribution ofthe effect ofthe self-diffraction gyration to the efficiency oftwo-wave interaction in the gyrotropic photorefractive crystal under external ac electric field. Fig.…”

Section: Resultsmentioning

confidence: 98%

<title>Nonunidirectional energy exchange at the two-wave interaction in cubic photorefractive crystals under a square-wave electric field</title>

Kobozev¹,

Maximov²,

Litvinov³

et al. 1999

SPIE Proceedings

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We demonstrate experimentally and theoretically that the sign of two-wave coupling gain in sillenite crystal at some polarization of light changes with the increase of the amplitude of square-wave field applying along the [1 1 0] axis. it is shown that the nonunidirectional energy exchange is the reason of this effect in Bi2TiO20 single crystal. Also strong influence of this effect on the polarization properties of the two-wave coupling gain was it revealed at the experimental investigations of the efficiency of the two-wave interaction in Bi12SiO20 single crystal. At the theoretical analysis we used the model obtained on the basic of the mode approach. Made the numerical calculation of dependencies of the two-wave coupling gain has good agreement with the experimental data. This calculation has allowed estimating the material parameters ofthe investigated samples ofthe crystal.Keywords: photorefraction, two-wave interaction, nonunidirectional energy exchange I . INTRODUCTIONSillenite crystals Bi12SiO20, Bi2GeiO20, and Bi12TiO20 are promising photorefractive materials for many applications, e.g., volume holographic storage, phase conjugation, optical information processing, and holographic interferometry 2 because of their small response time and high photosensitivity. The applying of alternating electric field of a square-wave form to these crystals can significantly increase their photorefractive response to a light pattern '.This becomes possible because the efficiency of division of charges at the formation of photorefractive response increases when increasing of value applied field. Herewith alternating external electric field can stimulate the gain as unlocal so and local components of the space charge field. Local component becomes the negligible small value if the frequency of the ac-applied field becomes much more than time of Maxwell's relaxation. Also, in this case time periodically modulation of the efficiency of the two-wave interaction in the stationary regime practically is absence, so two-wave mixing is steady state.Authors of majority of paper consider (see example 5.8), that energy exchange under steady state two-wave mixing is unidirectional if can neglect by the photovoltaic effect and absorption grating. In experiments this means, that directional of energy exchange between the interaction beam not dependencies from the ratio its intensity and from the value of the coupling constant Fm ' which increases when, increasing of amplitude of the external ac field. However, it is shown in that contribution of the effect of self-diffraction gyration, as it is called in , may be the reason of the nonunidirectional energy exchange at the two-wave mixing in a cubic photorefractive crystal under external ac electric field.In this work we report the experimental observation and numerical results of the nonunidirectional energy exchange in Bi12TiO20 and Bi12SiO20:Cd crystals. To explain this effect we consider the gain coefficient as a function ofthe amplitude of applied field and entrance polarization vec...

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Section: Resultsmentioning

confidence: 98%

<title>Nonunidirectional energy exchange at the two-wave interaction in cubic photorefractive crystals under a square-wave electric field</title>

Kobozev¹,

Maximov²,

Litvinov³

et al. 1999

SPIE Proceedings

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“…A BSO crystal 1-cm thick was investigated [31]. Holograms were recorded and read simultaneously by two coherent light pulses of length 15 ns.…”

Section: Role Of the Piezoelectric Effect In The Formation And Readinmentioning

confidence: 99%

Hologram recording and reading in cubic gyrotropic photorefractive piezocrystals (review)

Shepelevich

2011

J Appl Spectrosc

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535.4:548The evolution of the theoretical and experimental background for a photorefractive effect in cubic gyrotropic piezocrystals is reviewed. It is shown that the impact of the inverse piezoelectric effect and the photoelasticity on the formation and properties of holograms recorded in such crystals is not reduced to minor quantitative variations in their output characteristics but gives rise to qualitative changes both in the orientation and polarization dependences of the hologram diffraction efficiency and in the gain of an object wave at the expense of a reference one. Contributions of various scientific optical schools to the development of theoretical and experimental investigations on the photorefractive effect in cubic piezoelectric crystals are acknowledged and the importance of the experimental results is demonstrated. Particular emphasis is placed on ways to optimize the output characteristics of holograms recorded in cubic gyrotropic photorefractive piezocrystals. Among these are the choice of crystal cut, the selection of the crystal orientation, and the polarization of the light waves.

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“…where we denoted E (x)= C1(O)e1 +C1(O)e. exp{izkx] , (10) E(x)= C,(0)e -C1(0)e, exp[iAkx] , (11) Ph (x) = 2[+SflC(2PX ')sin(20)+ px sinc2 XJ)COS(20)]Tm ' (12) 3s (x) = k -2 cos(20)+ i/1 + 2 sin(20)sin(2px'Jl + 2)…”

Section: At the Approximation Of An Undepleted Pump Wave ( C(x) = C(omentioning

confidence: 99%

“…take into account the contribution of the elasto-optic effect12 At the equal of the polarization angles Os = O we obtained the vector amplitude of the resultant light field of the signal wave on the distance x from the border of the crystal in the…”

mentioning

confidence: 99%

Influence of the external electric field on the energy exchange direction at the two-wave interaction in the photorefrative Bi 12 TiO 20

Kobozev¹,

Litvinov

Шандаров

1999

SPIE Proceedings

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Influence of the photoelasticity on self-diffraction of light in electrooptic crystals

Cited by 12 publications

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<title>Nonunidirectional energy exchange at the two-wave interaction in cubic photorefractive crystals under a square-wave electric field</title>

<title>Nonunidirectional energy exchange at the two-wave interaction in cubic photorefractive crystals under a square-wave electric field</title>

Hologram recording and reading in cubic gyrotropic photorefractive piezocrystals (review)

Influence of the external electric field on the energy exchange direction at the two-wave interaction in the photorefrative Bi 12 TiO 20

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