City Research Online

Abstract

The work contained in this thesis is related to-the study of a device which can deflect light and control its position in two coordinates by acousto-optic means within a single medium. The acousto-optic deflection is achieved by the interaction of light with two co-existent, mutually orthogonal, ultrasonic waves within the medium.

The acousto-optic interaction has been theoretically analyzed to a more thorough degree than that previously reported and considerations regarding deflection efficiency, device geometry, and transducer alignment are discussed.

The interaction has initially been demonstrated using water as the interaction medium.

Of the recently discovered materials to show favourable acousto-optic properties lead molybdate has become a notable choice and a novel device using this material has been realised. A device has been constructed which is capable of displaying about 90 x 90 just resolvable spot positions with an access time of 1 us albeit at a low scattering efficiency.

The thesis includes a description of the behaviour of acoustic transducers for bulk wave excitation and the relevant parameters of the crystalline materials used in this work along with some practical considerations for device fabrication. The interaction bandwidth, with respect to transducer geometry has also been included.

The device has shown to be potentially promising for high speed applications requiring low to moderate capacity for reasonable power levels.

Publication Type:	Thesis (Doctoral)
Subjects:	T Technology > T Technology (General) T Technology > TK Electrical engineering. Electronics Nuclear engineering
Departments:	School of Science & Technology > Department of Engineering School of Science & Technology > School of Science & Technology Doctoral Theses Doctoral Theses

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