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High-Precision Frequency-Controlled Optical Phase Shifter with Acousto Optic Devices

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posted on 2023-12-07, 06:34 authored by Asaf Paris-Mandoki, Eduardo Esquivel Ramírez, Leonardo Uhthoff-Rodriguez, Edgar Giovanni Alonso-Torres, Alberto Hernández-López, Carlos Gardea-Flores
A fundamental parameter to determine how electromagnetic waves interfere is their relative phase. Therefore, achieving a fine control over it enables a wide range of interferometric applications. Existing phase control methods rely on modifying the optical path length by either changing the path followed by the light or by altering the thickness or index of refraction of an optical element in the setup. In this work we present a novel method, based on acousto-optic modulators (AOM), which allows adjusting the phase by shifting the frequency of the light in a segment of its path. Given that the amount of phase-shift depends on the length of the segment, an optical fiber is used to realize a 2π shift. Two experimental implementations are described which deal with different sources of phase fluctuations. The first addresses fluctuations resulting from the optical fiber while the second also tackles unwanted variations originating from the AOMs.

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Funder Name

Consejo Nacional de Ciencia y Tecnología (A1-S-29630,1084771,1084855,1084903,1146978); Dirección General de Asuntos del Personal Académico, Universidad Nacional Autónoma de México (IN115523)

Preprint ID

111084

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