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(Color online) Part of the conduction-band profile ( valley) of two active regions connected by an injector and the squared moduli of the wave functions involved in the transition (labeled as 3, 2, and 1). The laser transition is indicated by wavy arrows and the shaded area indicates the miniband. The dashed and dotted lines indicate the - and the -valley energy positions in the structure, respectively. The -valley energy position is calculated to be about above the -valley position in the quantum wells.
(a) Light output per facet vs injection current dependences recorded at various heatsink temperatures (right-hand scale), as well as the voltage-current characteristics taken at (left-hand scale) for an as-cleaved laser with a ridge size of operated in pulsed mode (, ). (b) Total (light from both facets is counted) electrical-to-optical power conversion efficiency at various temperatures as a function of injection current.
(a) Light output emitted from the front facet of a HR/uncoated laser vs injection current recorded at various heatsink temperatures. Ridge width and cavity length were and , respectively. Inset: curve of the device at . (b) Temperature-dependent front-facet power efficiency as a function of injection current.
Temperature dependence of the threshold current in pulsed-mode operation (, ) of the HR/uncoated laser (dots). The solid line represents an exponential fit according to the empirical relation , yielding a characteristic temperature of for the temperature range of .
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