Acousto-optic multiplexing and demultiplexing

Details Acousto-optic multiplexing and demultiplexing Acousto-optic multiplexing and demultiplexing

H - Electricity

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H01S 3/10 (2006.01) G02F 1/33 (2006.01) H01S 3/00 (2006.01) H01S 3/13 (2006.01) H01S 3/23 (2006.01) H04J 14/00 (2006.01) H04J 14/08 (2006.01)

Patent

CA 1128183

A B S T R A C T A system for multiplexing or demultiplexing pulsed. laser radiation having an acousto-optical device which is electrically controlled to switch a common path of high pulse rate laser radiation between a plurality of spatially distinct paths of relatively lower pulse rate laser radiation at which the pulses are sequenced according to a predetermined time pattern. The acousto-optical element typically includes a Bragg cell which is electrically driven by a set of distinct frequencies, causing deflection of radiation passing therethrough at a predetermined set of angles whereby pulsed radiation of a single path may be distributed onto the plural separate paths or radiation on plural separate paths of time-sequenced pulses of radiation can be combined into a single path of augmented pulse rate. The control of the acousto-optical element may be provided by selectively switching the output of a plurality of fixed frequency oscillators of different frequency to the acousto-optical element in accordance with the pattern of pulses on the common or plural distinct paths or a voltage-controlled oscillator may be sequenced through a repeating set of frequencies which are sampled one or more times per sequence to develop an error signal resulting in feedback control over the oscillator to eliminate long-term drift.

319537

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