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Temperature invariant output slope efficiency and threshold current ͑T 0 = ϱ͒ in the temperature range of 5-75°C have been measured for 1.3 µm p-doped self-organized quantum dot lasers. Similar undoped quantum dot lasers exhibit T 0 = 69 K in the same temperature range. A self-consistent model has been employed to calculate the various radiative and nonradiative current components in p-doped and undoped lasers and to analyze the measured data. It is observed that Auger recombination in the dots plays an important role in determining the threshold current of the p-doped lasers.

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No abstract

We demonstrate a diode laser system which is suitable for high-resolution spectroscopy in the 1.2 µm and yellow spectral ranges. It is based on a two-facet quantum dot chip in a Littrow-type external cavity configuration. The laser is tunable in the range 1125 -1280 nm, with an output power of more than 200 mW and exhibits a free-running linewidth of 200 kHz. Amplitude and frequency noise were characterized, including the dependence of frequency noise on the cavity length. Frequency stabilization to a highfinesse reference cavity is demonstrated reducing the linewidth to about 20 -30 kHz. Yellow light (> 3 mW) at 578 nm was generated by frequency doubling in an enhancement cavity containing a PPLN crystal. The source has potential application for precision spectroscopy of ultra-cold Yb atoms and molecular hydrogen ions.