Bow-tie surface-emitting lasers

In this letter we report a new design for surface emitting semiconductor la sers operating at 940 mn, incorporating a double-flare cavity, and distribu ted Bragg reflector (DBR) mirrors also providing surface emission. This des ign can take advantage of the modal behavior of the unstable resonator, and has shown very good mode control, with coherent emission from two facets i n the same direction. We report preliminary performance results showing ver y promising characteristics including single-mode diffraction limited opera tion, and spectral behavior with 42 dB side-mode suppression. This design h as exhibited promising results for increasing the current range between the lasing threshold and the filament threshold.