Determination of optimal conditions for wavefront phase conjugation in the photorefractive crystal of 43m symmetry class

For Russian citation (Opticheskii Zhurnal):

Навныко В.Н. Определение оптимальных условий обращения волнового фронта в фоторефрактивном кристалле класса симметрии 43m // Оптический журнал. 2025. Т. 92. № 8. С. 3–13. http://doi.org/10.17586/1023-5086-2025-92-08-3-13

Naunyka V.N. Determination of optimal conditions for wavefront phase conjugation in the photorefractive crystal of symmetry class 43m [in Russian] // Opticheskii Zhurnal. 2025. V. 92. № 8. P. 3–13. http://doi.org/10.17586/1023-5086-2025-92-08-3-13

For citation (Journal of Optical Technology):

Abstract:

Subject of study. Wavefront conjugation by diffraction of light beams on phase-amplitude holographic gratings in a cubic photorefractive crystal of ͞43m symmetry class. Aim of study. Determination of optimal conditions for four-wave mixing in the photorefractive crystal of ͞43m symmetry class , under which the highest intensity of the phase conjugated beam is achieved. Method. Numerical solution of coupled waves equations which takes into account the contribution of the linear electro-optical, photoelastic and inverse piezoelectric effects, as well as the linear absorption of the crystal. Main results. Under optimal conditions, a higher reflection coefficient for four-wave mixing is achieved in semiconductor with GaAs parameters of (111) cut than in the crystal of (110) and (001) cuts. For a given linear absorption coefficient, local maxima of the reflection coefficient are achieved when the crystal thickness is in a neighborhood of 20 mm. For each crystal cut, the values of the crystal orientation angle and the azimuths of the linear polarization of the light beams are established, at which the intensity of the phase-conjugated beam reaches its greatest value. Practical significance. The data presented in the article can be useful for increasing the efficiency of light beam diffraction by holographic gratings in the GaAs semiconductor by choosing optimal values of the crystal and holographic setup parameters.

Keywords:

wavefront conjugation, photorefractive crystal, holographic grating, reflectivity

Acknowledgements:

the study was financially supported by the Ministry of Education of the Republic of Belarus (Agreement dated March 22, 2021. 1410/2021) within the State Program of Scientific Studies № 6 "Photonics and Electronics for Innovations" in 2021–2025 (Assignment 6.1.14)

OCIS codes: 160.5320, 190.4380, 090.7330

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