Author:
Hamaguchi Tatsushi,Makino Tomohiro,Hayashi Kentaro,Kearns Jared A.,Ohara Maho,Ito Maiko,Kobayashi Noriko,Nagane Shouetsu,Sato Koichi,Nakamura Yuki,Hoshina Yukio,Jyoukawa Tatsurou,Watanabe Takumi,Kikuchi Yuichiro,Nakayama Eiji,Koda Rintaro,Futagawa Noriyuki
Abstract
AbstractWe report a self-induced spatially-coherent dot array consisting of fourteen units of vertical-cavity surface-emitting modes that exhibit spatially uniform spectra. A 47.5 µm total beam width and 0.5° narrow emission are achieved using an oblong cavity enclosed with a flat top mirror, cylindrically curved bottom mirror, and side facet. Notably, terminating the side of the cavity with a perpendicular facet enhances the horizontal propagation, which couples with the vertical resonance in each dot, similar to the case of master lasers in injection-locked lasers that delocalize the modes. Conventional semiconductor lasers, edge-emitting lasers, and vertical-cavity surface-emitting lasers have a Fabry–Pérot cavity; furthermore, emission and resonance are in identical directions, limiting the beam width to micrometers. Though the present structure has the same scheme of propagation, the right-angled facet synchronizes the modes and drastically expands the beam width.
Publisher
Springer Science and Business Media LLC
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