Title :
Monolithic bulk shear-wave acousto-optic tunable filter
Author :
Gnewuch, Harald ; Pannell, Christopher N.
Author_Institution :
Sch. of Phys. Sci., Univ. of Kent, Canterbury, UK
Abstract :
We demonstrate a monolithic bulk shear-wave acousto-optic tunable filter combining a piezoelectric transducer array and the acoustic interaction medium in a single crystal. An X-propagating acoustic longitudinal wave is excited in the "crossed-field" scheme by an RF-E/sub y/-field in a chirped acoustic superlattice formed by domain-inversion in lithium niobate (LiNbO/sub 3/). The acoustic longitudinal wave is efficiently (97.5%) converted at a mechanically free boundary into a Y-propagating acoustic slow-shear wave that couples collinearly propagating e- and o-polarized optical waves. A relative conversion efficiency of 80%/W was measured at 980 nm.
Keywords :
acousto-optical filters; bulk acoustic wave devices; lithium compounds; optical tuning; superlattices; 97.5 percent; 980 nm; LiNbO/sub 3/; LiNbO/sub 3/ single crystal; RF-E/sub y/-field; X-propagating acoustic longitudinal wave; Y-propagating acoustic slow-shear wave; acoustic interaction medium; acousto-optic tunable filter; chirped acoustic superlattice; collinearly propagating optical waves; crossed-field scheme; domain-inversion; e-polarized optical waves; mechanically free boundary; monolithic bulk shear-wave type; o-polarized optical waves; piezoelectric transducer array; Acoustic arrays; Acoustic propagation; Acoustic waves; Chirp; Filters; Lithium niobate; Optical coupling; Optical propagation; Piezoelectric transducers; Superlattices; Acoustics; Computer Simulation; Crystallization; Equipment Design; Models, Theoretical; Niobium; Optics; Oxides; Quality Control; Stress, Mechanical; Telecommunications; Transducers;
Journal_Title :
Ultrasonics, Ferroelectrics, and Frequency Control, IEEE Transactions on
DOI :
10.1109/TUFFC.2002.1159843
