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The commercially available semiconductor lasers for the mid-infrared (MIR) region often do not reach the desired performance and represent a limitation for gas sensor technology. Here we present our digital distributed feedback filter (D-DFB) laser diodes based on GaSb gain material, which have been optimized in terms of facet reflectivity, chip length, and output power. These diodes now cover the wavelength range from 1900 nm up to 4500 nm and show excellent quality regarding their spectral characteristics. Results for the performance of the D-DFB laser design and its suitability for the detection of trace gases are shown in this publication.
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Hoppe et al. (2021) studied this question.
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