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Control of longitudinal modes in semiconductor-laser phased arrays by phase velocity matching

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A major characteristic of semiconductor-laser phased arrays is their spectral mode structure. It is inherently related to the degree of phase coherence among the elements of the array, which, in turn, affects the far-field pattern. Spectra of both gain-guided and index-guided phased arrays were found to exhibit generally multilongitudinal-mode operation.1,2 In all these devices, however, the individual array elements were electrically connected in parallel. Here we describe the spectral features of separate-contact laser arrays3 in which each laser is biased independently.

© 1984 Optical Society of America

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