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Zayer, N. K.
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article
Broadband monolithic acousto-optic tunable filter
Abstract
Broadband monolithic acousto-optic tunable filters that combine a piezoelectric transducer array and an acousto-optic interaction medium in a single crystal have been investigated. A linearly chirped acoustic superlattice with an optical tuning range of λ = 1.3-1.6 µm was formed by domain inversion in LiNbO<sub>3</sub>. X-propagating longitudinal acoustic waves are excited in a crossed-field scheme by a rf Ey field applied to the superlattice and couple collinearly propagating e- and o-polarized optical modes. At λ = 1.319 µm and λ = 1.55 µm the spectral bandwidths (FWHM) were 1.54 and 2.3 nm, respectively. A relative conversion efficiency of 43%/W and a maximum conversion efficiency of 51% were measured at 1.319 µm.