Monolithic bulk shear wave acousto-optic tunable filter

Harald Gnewuch; Christopher N. Pannell

doi:10.1117/12.474830

17 February 2003 Monolithic bulk shear wave acousto-optic tunable filter

Harald Gnewuch, Christopher N. Pannell

Proceedings Volume 4833, Applications of Photonic Technology 5; (2003) https://doi.org/10.1117/12.474830
Event: Applications of Photonic Technology 5, 2002, Quebec City, Canada

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-E_y-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.

Citation Download Citation

Harald Gnewuch and Christopher N. Pannell "Monolithic bulk shear wave acousto-optic tunable filter", Proc. SPIE 4833, Applications of Photonic Technology 5, (17 February 2003); https://doi.org/10.1117/12.474830

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