Ukrainian Journal of Physical Optics


2024 Volume 25, Issue 3


ISSN 1816-2002 (Online), ISSN 1609-1833 (Print)

DEMULTIPLEXING OF OPTICAL BEAM WITH USING OF RAMAN-NATH ACOUSTO-OPTIC DIFFRACTION AND SINGULAR ACOUSTIC BEAM

1I. Skab, 1M. Kostyrko, 3B. Sulanov, 1,2O. Krupych and 1R. Vlokh

1Vlokh Institute of Physical Optics, 23 Dragomanov Str., 79005, Lviv, Ukraine, vlokh@ifo.lviv.ua
2Department of optoelectronics and information technologies of the Ivan Franko National University of Lviv, Generala Tarnavskogo Str. 107, Lviv, 79017, Ukraine
3Vacoms LLC, 1201 North Market Str., Suite 111, Wilmington, DE 19801

ABSTRACT

It has been shown that the acousto-optic Raman-Nath diffraction on the acoustic wave, which bears an acoustic vortex, is accompanied by the appearance of the diffraction maxima that bear an optical vortex. The charge of the vortices that appears as a result of the diffraction corresponds to the order of diffraction if the incident optical beam is the Gaussian beam and the charge of the acoustic vortex is equal to unity. When the incident optical vortex beam takes part in this process, the charge of the diffracted optical vortices is shifted on the charge value of the incident optical beam. As a result of the analysis, we obtained the relation for the charge of vortices of diffraction maxima. It has been found that the described effect can be used for controlled demultiplexing.

Keywords: demultiplexing, orbital angular momentum, optical vortex, acoustic vortex, Raman-Nath diffraction

UDC: 535.4+534.2

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    Показано, що акустооптична дифракція Рамана-Ната на акустичній хвилі, яка переносить акустичний вихор, супроводжується появою дифракційних порядків, які переносять оптичні вихори. Заряд вихорів, що виникають в результаті дифракції, відповідає порядку дифракції, якщо падаючий оптичний промінь є гауссівським, а заряд акустичного вихору дорівнює одиниці. Коли в цьому процесі приймає участь падаючий оптичний вихровий пучок, заряд дифрагованих оптичних вихорів зміщується на значення заряду падаючого оптичного променя. У результаті аналізу отримано співвідношення для заряду вихорів дифракційних максимумів. Встановлено, що описаний ефект можна використовувати для керованого демультиплексування.

    Ключові слова: демультиплексування, орбітальний кутовий момент, оптичний вихор, акустичний вихор, дифракція Рамана-Ната

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