Spectral Characteristics and Inhomogeneities near Active Regions of Double-Heterostructure (GaAl)As-GaAs Lasers with Stripe Geometry Configuration

概要

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It is shown experimentally that several types of spectra of double heterostructure (GaAl)As-GaAs lasers are connected with corresponding inhomogeneities in and around their active regions. i) Families of axial modes belonging to different transverse modes along the junction plane often show different axial mode spacings, indicating filamentary nature along the axial direction. This type of oscillation may be called "quasi-filamentary". ii) Families of axial modes in one transverse mode were also observed, which arise from the mode selection effect associated with sharp changes of the thickness of the active layer. iii) For some lasers, evidence is given that local boundaries rather than the heteroboundaries play an essential role. iv) The sustained pulsations having characteristics of the second order mode locking are connected with saturable absorption which arises from the existence of nonuniformity in the active region.
社団法人応用物理学会の論文
1974-08-05