Abstract
Five diode gain elements (diode lasers with one facet antireflection coated) have been controlled to operate coherently with each other by a spatial filter placed between the antireflection coated facet and the mirror of an external cavity which provides the feedback for laser operation. The locking of the lasers is relatively insensitive to phase adjustment in each laser path. Locking has occurred with lasers whose output wavelength when operating individually differed by 60 Å. It is expected that the maximum tolerance to wavelength difference is much larger because lasers used were selected so simple individual temperature control could bring them into wavelength coincidence. These results point to the feasibility of placing well over a thousand diode lasers in an external cavity with coherent output.
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