Title :
Minimization of nonlinear acousto-optic Bragg cell intermodulation products
Author_Institution :
Photonic Syst. Inc., Melbourne, FL, USA
Abstract :
The acoustooptic Bragg cell intermodulation products (IMPs) arising from multiple optical diffraction (dynamic IMPs) fundamentally limit Bragg-cell dynamic range. The IMPs arising from acoustic harmonic waves generated by the nonlinear elastic response of the Bragg cell crystalline lattice (elastic IMPs) may further limit dynamic range in Bragg cells operating at high frequencies or long time apertures. It is shown that the elastic IMPs can be minimized by increasing the Bragg-cell transducer length. The length can be increased without the attendant bandwidth loss using a phased array transducer. It is shown experimentally that this device is limited in dynamic range by the dynamic IMPs and thus exhibits the maximum spurious-free dynamic range possible
Keywords :
acousto-optical devices; spectral analysers; surface acoustic wave devices; Bragg-cell dynamic range; acoustic harmonic waves; acoustooptic Bragg cell intermodulation products; bandwidth loss; crystalline lattice; multiple optical diffraction; nonlinear elastic response; phased array transducer; Acoustic waves; Apertures; Crystallization; Dynamic range; Frequency; Lattices; Nonlinear acoustics; Optical diffraction; Optical harmonic generation; Phased arrays;
Conference_Titel :
Ultrasonics Symposium, 1989. Proceedings., IEEE 1989
Conference_Location :
Montreal, Que.
DOI :
10.1109/ULTSYM.1989.67037
