LOSSLESS SIDELOBE SUPPRESSION FOR A PHASE-LOCKED CO//2 WAVEGUIDE ARRAY.

Michael Holz, James R. Leger, Gary J. Swanson

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Scopus citations

Abstract

Recently, phase-coupled arrays of semiconductor and gas lasers have been developed. The far-field pattern of spatially distinct lasers contains grating sidelobes which significantly reduce the available power in the central lobe. A spatial filtering technique, called coherent aperture filling by amplitude-to-phase conversion, is described for channeling the majority of the sidelobe energy into the central lobe. The technique was tested on a phase-locked CO//2 ridged waveguide array. Highly efficient sidelobe suppression results from a lossless field transformation that converts amplitude nonuniformity to phase nonuniformity. The resultant aperture-filled array has a nearly uniform amplitude distribution. An additional phase nonuniformity giving an output with nearly uniform amplitude and phase. The field transformation is accomplished by an afocal imaging system.

Original languageEnglish (US)
Title of host publicationUnknown Host Publication Title
PublisherOptical Soc of America
Pages356-357
Number of pages2
ISBN (Print)0936659491
StatePublished - Jan 1 1987

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