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Proceedings Paper

Monolithic bulk shear wave acousto-optic tunable filter
Author(s): Harald Gnewuch; Christopher N. Pannell
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Paper Abstract

We demonstrate a monolithic bulk shear-wave acousto-optic tunable filter which combines a piezoelectric transducer array and the acoustic interaction medium in a single lithium niobate wafer piece. By applying an rf-Ey-field, a chirped acoustic grating, formed by domain-inversion, excites an X-propagating longitudinal wave which is converted at a mechanically free boundary into a Y-propagating X-polarized slow-shear wave which itself couples collinearly propagating e- and o-polarized optical waves. A relative (absolute) conversion efficiency of 80%/W was measured at 980 nm. Regarding the filter properties the obtained FWHM in the frequency domain reflects the use of the overall length of the device as the acousto-optic interaction medium, whereas the sidelobe suppression is with approximately -3dB higher than the theoretical value of approximately -9 dB. Possible causes of such behavior are discussed and an improved design is suggested.

Paper Details

Date Published: 17 February 2003
PDF: 10 pages
Proc. SPIE 4833, Applications of Photonic Technology 5, (17 February 2003); doi: 10.1117/12.474830
Show Author Affiliations
Harald Gnewuch, Univ. of Kent at Canterbury (United Kingdom)
Christopher N. Pannell, Univ. of Kent at Canterbury (United Kingdom)

Published in SPIE Proceedings Vol. 4833:
Applications of Photonic Technology 5
Roger A. Lessard; George A. Lampropoulos; Gregory W. Schinn, Editor(s)

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