M. Brandstetter, A. Genner, C. Schwarzer, E. Mujagic, G. Strasser, B. Lendl:
"Time-resolved spectral characterization of ring cavity surface emitting and ridge-type distributed feedback quantum cascade lasers by step-scan FT-IR spectroscopy";
Optics Express, 22 (2014), 3; S. 2656 - 2664.

Kurzfassung englisch:
We present the time-resolved comparison of pulsed 2 nd order ring cavity surface emitting (RCSE) qua ntum cascade lasers (QCLs) and pulsed 1 st order ridge-type distributed feedback (DFB) QCLs using a step- scan Fourier transform infrared (FT-IR) spectrometer. Laser devices were part of QCL arrays and fabricated fr om the same laser material. Required grating periods were adjusted to account for the grating order. The step-scan technique provided a spectral resolution of 0.1 cm -1 and a time resolution of 2 ns. As a result, it was possible to gain information about the tuning behavior and potential mode-hops of the investigated lasers. Different cavity-lengths were compared, including 0.9 mm and 3.2 mm long ridge- type and 0.97 mm (circumference) ring-type cavities. RCSE QCLs were found to have improved emission properties in terms of line-stability, tuning rate and maximum emission time compared to ridge-type lasers.

quantum cascade laser

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