Title :
Phased array slow shear TeO2 Bragg cells: design and performance
Author :
Pape, D.R. ; Shah, Mrugesh L.
Author_Institution :
Photonic Syst. Inc., Melbourne, FL
fDate :
31 Oct-3 Nov 1993
Abstract :
The phased array transducer, when combined with the anisotropic Bragg interaction, provides a unique combination of features not available with the usual acoustical or optical rotation schemes used in the design of slow shear TeO2 Bragg cells. A general theory for a phased array Bragg interaction in a birefringent medium is applied to the design of a 60 MHz bandwidth, 50 μs time-aperture slow shear TeO2 Bragg cell. A 90 MHz center frequency device designed for 810 nm illumination with a 12-element Gaussian apodized phased array transducer with 154 μm element spacing oriented 1° from [110] was fabricated. The device exhibited the design center frequency and bandwidth with over 30%/W peak diffraction efficiency with a fully illuminated aperture. The device exhibits Hecht limited two-tone third order intermodulation products over at least half of the time-aperture
Keywords :
acousto-optical devices; birefringence; tellurium compounds; ultrasonic transducers; 50 mus; 60 MHz; 811 nm; 90 MHz; Gaussian apodized phased array transducer; Hecht limited two-tone third order intermodulation products; TeO2; bandwidth; birefringent medium; center frequency; design; diffraction efficiency; performance; phased array transducer; slow shear TeO2 Bragg cells; Acoustic transducers; Anisotropic magnetoresistance; Bandwidth; Birefringence; Frequency; Geometrical optics; Lighting; Optical arrays; Optical design; Phased arrays;
Conference_Titel :
Ultrasonics Symposium, 1993. Proceedings., IEEE 1993
Conference_Location :
Baltimore, MD
Print_ISBN :
0-7803-2012-3
DOI :
10.1109/ULTSYM.1993.339529
