Signal recording in acoustooptical imaging of scattering media |
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Authors: | A P Solov’ev M I Perchenko Yu P Sinichkin O V Zyuryukina |
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Institution: | (1) Research Institute of Mechanics and Physics, Saratov State University, Moskovskaya ul. 155, Saratov, 410026, Russia |
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Abstract: | An expression for a signal at the ultrasonic frequency from a photodetector arising when diffraction waves at the cathode
mix is obtained for the case when the optical and acoustic beams are space-limited and Bragg angles are small. The alternating
current generated when the scattering medium is crossed by a focused 3-MHz ultrasonic beam and illuminated by a cw He-Ne laser
is measured. Satisfactory agreement between experimental results and those calculated from the formulas obtained indicates
that our model treating acoustooptical interaction in the medium in terms of Raman-Nath diffraction is valid. Conditions for
measuring the alternating current (which is a parameter of acoustooptical imaging) that are optimal from the viewpoint of
maximizing the signal and signal-to-noise ratio are predicted theoretically and corroborated experimentally. |
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