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A fundamental parameter to determine how electromagnetic waves interfere istheir relative phase. Therefore, achieving a fine control over it enables awide range of interferometric applications. Existing phase control methods relyon modifying the optical path length by either changing the path followed bythe light or by altering the thickness or index of refraction of an opticalelement in the setup. In this work we present a novel method, based onacousto-optic modulators (AOM), which allows adjusting the phase by shiftingthe frequency of the light in a segment of its path. Since the amount ofphase-shift depends on the length of the segment, an optical fiber is used torealize a \boldmath$2\pi$ shift. Two experimental implementations are describedwhich deal with different sources of phase fluctuations. The first addressesfluctuations resulting from the optical fiber while the second also tacklesunwanted variations originating from the AOMs.

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