Abstract—For broadband modulation of the intensity of optical radiation, the tandem arrangement two acousto-optic (AO) Bragg cells are proposed in which acoustic waves propagate in opposite directions. The device allows modulation of optical radiation in the acoustic frequency band of ~6 MHz at four times the frequency of the sound. The possibility of switching the modulation frequency from 2f to 4f, where f is the frequency of sound, by simply turning the output polarizer is demonstrated. The method is experimentally tested for modulating radiation with a wavelength of 0.63 × 10–4 cm using two AO cells made of paratellurite operating at a center frequency of 22 MHz.
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Funding
The work was carried out with the partial financial support of the Russian Foundation for Basic Research (project nos. 18-07-00259 and 19-07-00071).
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Kotov, V.M. Broadband Acousto-Optic Modulation of Optical Radiation. Acoust. Phys. 65, 369–373 (2019). https://doi.org/10.1134/S1063771019040080
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DOI: https://doi.org/10.1134/S1063771019040080