The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 27, 1999
Filed:
Jan. 14, 1997
Korea Institute of Science and Technology, Seoul, KR;
Abstract
A multi-channel acousto-optic spatial modulator for fast signal processing by a plurality of acousto-optic modulating cells connected in a line. The multi-channel acousto-optic spatial modulator in accordance with the present invention comprises a plurality of modulating cells each for modulating the incident light, acoustic waves being created within each of said plurality of modulating cells; and a plurality of absorbing plates each interposed between said two modulating cells for shielding the acoustic wave created within one of said two modulating cells from being propagated into the other of said two modulating cells. Each of the modulating cells comprises a unit crystal upon which a light is incident, a piezoelectric transducer coupled to the top surface of the unit crystal and having one pair of electrodes for allowing an acoustic wave to be created in the unit crystal in response to the signal applied to the one pair of electrodes; and an acoustic wave absorber coupled to the top surface of the unit crystal for absorbing the acoustic wave propagating in the unit crystal. Thus, a moving diffraction grating is formed within the unit crystal as the acoustic wave created by the piezoelectric transducer is reflected by one side surface of the unit crystal and propagated to the other side surface. The plurality of modulating cells are connected such that the orientation of the top surface of the unit crystal alternates with every cell.