Study of refractive index modulation of volume photosensitive media

Authors: Kim Yehan
Published in issue: #9(50)/2020
DOI: 10.18698/2541-8009-2020-9-638
Category: Instrument Engineering, Metrology, Information-Measuring Instruments and Systems | Chapter: Laser and opto-electronic systems
Keywords: bragg diffraction gratings, diffraction, selectivity, refractive index modulation, diffraction efficiency, photosensitive media, diffractometry, angular selectivity contour
Published: 23.09.2020

The article presents a study of the modulation of the refractive index using diffractometry of Bragg diffraction gratings. Several methods are considered for measuring the selectivity contour based on changes in the refractive index, thickness, and medium. The method in this work is based on measuring the contour of the angular selectivity of the diffracted beam. A method is presented for calculating the modulation of the refractive index of a diffraction grating in three stages: obtaining experimental data on the developed installation, approximating and comparing the resulting contour with a mathematical model according to the theory of coupled waves. The developed method allows one to quickly measure the modulation of the refractive index in laboratory conditions, and also solves the problem of efficient use of the dynamic range of a photosensitive medium and the corresponding maximization of the diffraction efficiency.

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