Dynamic Two-Dimensional Refractive Index Modulation For High Performance Acousto-Optic Deflector

Abstract

The performance of an acousto-optic deflector is studied for two-dimensional refractive index that varies as periodic and sinc functions in the transverse and longitudinal directions, respectively, with respect to the direction of light propagation. Phased array piezoelectric transducers can be operated at different phase shifts to produce a two-dimensionally inhomogeneous domain of phase grating in the acousto-optic media. Also this domain can be steered at different angles by selecting the phase shift appropriately. This mechanism of dynamically tilting the refractive indexmodulated domain enables adjusting the incident angle of light on the phase grating plane without moving the light source. So the Bragg angle of incidence can be always achieved at any acoustic frequency, and consequently, the deflector can operate under the Bragg diffraction condition at the optimum diffraction efficiency. Analytic solutions are obtained for the Bragg diffraction of plane waves based on the second order coupled mode theory, and the diffraction efficiency is found to be unity for optimal index modulations at certain acoustic parameters.

Publication Date

12-28-2015

Publication Title

Optics Express

Volume

23

Issue

26

Number of Pages

33667-33680

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1364/OE.23.033667

Socpus ID

84962176506 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/84962176506

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