Dynamic self-diffraction of coherent light beams

Vinetskiǐ, V. L.; Kukhtarev, N. V.; Odulov, S. G.; Soskin, M. S.

doi:10.1070/pu1979v022n09abeh005609

Cited by 198 publications

(48 citation statements)

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“…As a result, many diffraction orders are observed. The output intensities in every diffracted order can be found from the wave equation [9]. Using the conventional approximation of a slow varying amplitude and taking into account that absorption connected with conduction current is absent during action of a nanosecond laser pulse, we obtain the differential equations followed from the wave equation that describes the changes of the wave complex amplitudes through a nonlinear medium along the direction of light propagation where A A i i i = exp( ) j is the wave complex amplitude, i = ±1, ±2 designates the diffraction orders, i = 0 denotes the transmission beam, z z d ' ln cos = 10 2 q is the normalized coordinate, n 0 is the average refractive index (for the potassium caproate n 0 = 1.44).…”

Section: Holographic Properties Of Ilc Composites With Dyesmentioning

confidence: 99%

Nonlinear optical properties of composites based on conductive metal-alkanoate liquid crystals

Bugaychuk

Klimusheva

Garbovskiy

et al. 2006

Opto-Electronics Review

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The dynamic holography in new composite materials based on a novel class of metal-alkanoate ionic liquid crystals (ILCs) is studied experimentally and theoretically. The composites are formed as a dielectric dye film covered by lyotropic metal-alkanoate ILC and ionic smectic glasses with doped dye molecules. The dynamic gratings are created by nanosecond pulses of double frequency Nd:YAP laser, the recording demonstrates fast erasure time of residual thermal gratings. The nonlinear optical properties are determined by the resonance nonlinearity in photosensitive centres of ILC. Note, that permanent relief gratings will be formed on a dielectric dye film only as well as in composite cells either with nematic LC or with polymers under action of pulsed laser radiation. Lyotropic ILC layer applied over the dye film provides the dynamic regime of grating recording in composite cells. We found a secondary thermal grating is much smaller, the conductive ILC matrix provides effective heat dissipation and erasure of this thermal grating. A theory of Raman-Nath self-diffraction holography on thin films followed from the wave equation and the nonlinear mechanism of absorption saturation is developed to explain experimental results.

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Section: Holographic Properties Of Ilc Composites With Dyesmentioning

confidence: 99%

Nonlinear optical properties of composites based on conductive metal-alkanoate liquid crystals

Bugaychuk

Klimusheva

Garbovskiy

et al. 2006

Opto-Electronics Review

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show abstract

“…3,20 A small diffraction efficiency also reduces the effect of coupling between the writing beams; beam coupling during writing introduces distortions in the grating. 21 (8) Reflection of the erasing beam at the back sample boundary was neglected. Typically, a small percentage of the erasing beam is reflected, which causes the erasure near this boundary to be slightly faster than is assumed in the calculations.…”

Section: Appendix A: List Of Assumptionsmentioning

confidence: 99%

Effect of beam attenuation on photorefractive grating erasure

et al. 1996

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We investigate the influence of attenuation on the speed of erasure of photorefractive gratings by solving the coupled-wave equations in the undepleted pump approximation and by taking into account the attenuation and Gaussian intensity profile of all the beams. The extrinsic grating decay rate is significantly lower than the intrinsic photorefractive decay rate in samples with overall attenuation as low as 10%. The Gaussian beam profiles of the readout and the erasing beams result in a further reduction of the extrinsic decay rate. The results of these calculations are used to determine the spectrum of intrinsic decay rates in a photorefractive polymer.

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“…7 Transient energy coupling (TEC), including the interaction between two coherent beams and the induced grating formation, has been studied theoretically, and approximate analytic 8 -1 2 and numericall 3 solutions have been obtained. These studies [8][9][10][11] " 3 show that, although there is no steady-state energy exchange between the beams in unshifted dynamic holographic media, TEC occurs in such media with noninstantaneous responses. In particular, it is shown that TEC occurs in photorefractive media operating in the charge-drifting mode (which is obtained by applying an appropriate external field and using large grating periods).…”

Section: Introductionmentioning

confidence: 99%