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Proceedings Paper

Functional improvements in some of acoustooptic devices by means of preliminary dynamic signal predistortions
Author(s): Valery Proklov; Sergey Antonov; Lev Chesnokov; Vyacheslav Chesnokov; Yury Rezvov
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Paper Abstract

All acoustooptic (AO) devices are based on the inherent nonlinear dependence of the light diffraction efficiency as a function the acoustical wave intensity. In AO devices using a single frequency acoustic wave it is easy to be taken into account to describe all functional properties and limits of the first order diffraction. But in many practical devices using multi-frequency sounds like AO signal processors or multipoint AO deflectors the description are a very complicated, because of a very strong frequency intermodulations. These effects give functional disadvantages in the AO implementations- the decrease of the first order diffraction efficiency maximum to much less than 100%, the appearance of spurious orders and etc. In this work there were developed the theoretical arguments for the possibility to have the appropriate signal dynamic predistortions to have a serious change of mentioned intermodulations and to obtain some advances in limitations of many existing AO devices. The proposal uses the new technique by authors for synthesis and programmable dynamic changes of all RF signals performing the preliminary electronic signal treatment to cancel a certain diffraction modes. The experimental verifications with AO modulators based on TeO2 crystal have been performed. With use of the analogue third order polynomial RF synthesizer there were obtained a good suppression up to 10-15 dB of two-tone second-order intermodulations in area of second order diffraction and two-tone third order spurious modes in the first order diffraction area, in accordance with proper theoretical calculations. There was also verified new technique providing maximal optical power in multi beams laser diagram. In TeO2 AO modulators the growth of the efficiency of two-beam He-Ne laser about 14% was obtained.

Paper Details

Date Published: 29 September 2005
PDF: 11 pages
Proc. SPIE 5953, Acousto-optics and Photoacoustics, 59530L (29 September 2005); doi: 10.1117/12.623748
Show Author Affiliations
Valery Proklov, Institute of Radio Engineering and Electronics (Russia)
Sergey Antonov, Institute of Radio Engineering and Electronics (Russia)
Lev Chesnokov, Institute of Radio Engineering and Electronics (Russia)
Vyacheslav Chesnokov, Institute of Radio Engineering and Electronics (Russia)
Yury Rezvov, NIRChTU (Russia)

Published in SPIE Proceedings Vol. 5953:
Acousto-optics and Photoacoustics
Antoni Sliwinski; Rainer Reibold; Vitaly B. Voloshinov, Editor(s)

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