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11 May 2004 Single-mode InP-based quantum cascade lasers for applications in trace-gas sensing
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We present pulsed operation of index-coupled distributed feedback quantum cascade lasers based on the GaInAs/AlInAs/InP materials system emitting at a wavelength around 5.4 μm. The emission is single mode in the entire investigated temperature range between 240K and 350K with a side mode suppression ratio larger than 27 dB. These devices are employed in a fast gas detection experiment for the quantitative detection of nitric oxide. With the present measurement system minimum noise equivalent concentrations between 16.7 ppbv and 23.3 ppbv are obtained, corresponding to minimum detectable optical densities between 4.7•10-5 and 6.5•10-5.
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Christian Mann, Quankui Yang, Frank Fuchs, Wolfgang Bronner, Klaus Köhler, Thomas Beyer, Marcus Braun, and Armin Lambrecht "Single-mode InP-based quantum cascade lasers for applications in trace-gas sensing", Proc. SPIE 5365, Novel In-Plane Semiconductor Lasers III, (11 May 2004);

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