Acousto-optic light beam scanner

Details Acousto-optic light beam scanner Acousto-optic light beam scanner

1976-01-12

1977-05-24

Webster, Robert J.

350150, G02F 133

Patent

active

040251667

ABSTRACT:
A light beam scanner consisting of an acoustic cavity having a length l, a width w between two side surfaces and a thickness t between the other two side surfaces. The cavity is transparent to optical energy and is capable of supporting acoustic energy of frequency f reflected through the length of the cavity at an angle of incidence .theta. to the remaining surfaces, where ##EQU1## WHERE M IS AN INTEGER AND V IS THE VELOCITY OF ACOUSTIC ENERGY IN THE CAVITY. Acoustic waves at a controlled frequency f are generated in one end of the cavity from one of the remaining side surfaces so as to have a continuous distribution of direction. A beam of collimated monochromatic light having a wavelength .lambda. is directed onto one of the side surfaces either substantially perpendicular to it or at the Bragg angle, to be transmitted through the cavity and diffracted by the acoustic energy in the cavity. Focussing means focusses the diffracted beam onto a plane where it appears at a point .theta., d, where ##EQU2## WHERE F.sub.L IS THE FOCAL LENGTH OF THE FOCUSSING MEANS.

REFERENCES:
patent: 3822379 (1974-07-01), Brienza
IBM Tech. Discl. Bull., vol. 13, No. 1, June 1970, pp. 269-270, (E.G.H. Lean).

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