Single-volume dual-channel acousto-optical tunable filter

Abstract

In this paper, we present a novel approach to spectral stereoscopic imaging. It is based on simultaneous spectral filtration of two light beams with a tunable acousto-optical filter (AOTF) of original design. It does not require large crystals and complicated optical relay systems, because two beams diffract in the same volume of the crystal medium but at different angles. We show that this geometry can be composed of a common-type AO cell and two triangular prisms of the same material. We derive equations, which specify the prism angles ensuring the necessary orientation of beams trajectories inside the crystal medium as well as parallel propagation of input and output beams. Some angles were additionally optimized for aberrations minimization by means of ray-tracing simulation. Experimental testing demonstrates rather high quality of spectral images, which is necessary for stereoscopic reconstruction procedure. The proposed approach makes possible development of spectral stereo-imaging components based on different types of previously developed AOTFs.

Broadly tunable filter based on a graphene MEMS-photonic crystal composite structure and its application in single-pixel full-color displays

“…These optical devices have significant applications in fields such as optical communication, 1,2 optical sensing, 3,4 spectral and chemical analysis, [5][6][7][8][9] and wearable smart devices. 10,11 Currently, tunable narrowband optical filters mainly include liquid crystal tunable filters, [12][13][14] acousto-optic tunable filters, 15,16 tunable filters based on volume Bragg gratings, 17,18 and Fabry Pe ´rot (FP) tunable filters. [19][20][21][22][23] Among them, FP filters based on graphene microelectromechanical system (MEMS) technology have become a research focus due to their advantages such as small size, narrow bandwidth, high contrast, and low cost.…”

“…These optical devices have significant applications in fields such as optical communication, 1,2 optical sensing, 3,4 spectral and chemical analysis, 5–9 and wearable smart devices. 10,11 Currently, tunable narrowband optical filters mainly include liquid crystal tunable filters, 12–14 acousto-optic tunable filters, 15,16 tunable filters based on volume Bragg gratings, 17,18 and Fabry Pérot (FP) tunable filters. 19–23…”

Calibration of Acousto-Optic Interaction Geometry Based on the Analysis of AOTF Angular Performance

“…When compared with traditional optical splitters, such as prism, grating and interferometer, it has advantages in terms of a large-angle aperture, high spectral resolution, arbitrary wavelength configuration, fast tuning speed and it does not require moving elements [ 2 , 3 ]. Therefore, it is widely used in many applications, such as spectral imaging [ 4 , 5 ], polarization analysis [ 6 , 7 ], stereoscopic imaging [ 8 ] and notch filtering [ 9 ], etc. In addition, in the case of monochromatic input light, AOTFs also have the abilities of spatial filtering and edge enhancement [ 10 , 11 ].…”

Investigation of acousto-optic interaction with momentum mismatching considering acoustic anisotropy in birefringent crystal

“…AO techniques are currently widely applied across various domains of scientific and engineering. Non-collinear AOTF, which is commonly used in fields such as spectroscopy, optical imaging, and medical diagnostics, is a typical AO device designed based on the principle of abnormal Bragg diffraction in AO interaction and has the advantages such as compact size, rapid tuning and high diffraction efficiency [1][2][3][4][5][6][7][8] . Typically, the AO interaction is analyzed using the plane wave approximation in which the acoustic wave is considered as a single plane wave propagating perpendicular to the transducer [9] .…”