Singlemode 1.3 µm Fabry-Perot lasers by modesuppression

Abstract
Focused Ga+ ion beam etched pits are used to simulate defects, reflective and nonradiative, in conventional 1.3 µm Fabry-Perot lasers. Combination of three defect sites positioned along the lasing filament results in a quasi-singlemode laser with 30 dB mode suppression and negligible rises in threshold current. The authors also report the appearance of a single enhanced spectral line below threshold.