Acouso-optic processing of images in ultraviolet, visible and infrared regions of spectrum

Improvement in performance of a TeO2acousto-optic imaging spectrometer

“…This is why, the wide-angle AOTFs are capable of operation with optical beams possessing two-dimensional divergence. These devices have found applications for spatial filtration of monochromatic light and for spectral analysis of images [9][10][11][12][13][14].…”

“…Variation of optical wavenumber with the optical wavelength caused the dispersion of the deflection angle θ d at a constant value of the Bragg incidence angle θ i . Therefore, diffraction of nonmonochromatic radiation is followed by the broadening of the minimum resolvable element [9,10,14,15]. This broadening increases with the growth of the passband.…”

Two regimes of wide angle acousto-optic interaction in tellurium dioxide single crystals

“…The second case [labeled (b)] is realized if the AO interaction is close to the collinear with light propagating far away from the optical axis. The first regime of diffraction is described in literature in detail [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17]. Moreover, the majority of current imaging devices is based on the diffraction observed in the crystal near the optical axis [4][5][6]9,10,[13][14][15]17].…”

“…Wide angle AO tunable filters based on TeO 2 crystals have been widely used in the analysis of images in the ultraviolet, visible, and IR range of electromagnetic radiation [4][5][6][9][10][11][12][13][14][15][16][17]. Traditionally, the design of the imaging AOTFs using the paratellurite crystals is based on the AO interaction in the 110 plane when a slow shear acoustic wave propagates in the material and modulates its refractive index, n. A direction of the acoustic wave propagation in the 110 plane is described by the tilt angle, α, measured between the acoustic phase velocity vector K and the axis 110; of the crystal.…”

“…The other modification is represented by wide angle AOTFs capable of image processing [3][4][5][6][7][8][9][10]. One of the practical problems that may be solved by the wide angle AOTFs is the spectral analysis of images [3][4][5][6][8][9][10][11][12][13][14][15][16][17]. Moreover, wide angle AOTFs can also produce spatial filtering of light beams forming images in monochromatic light [7,18].…”