This article [5], which is a compilation of all the collected data throughout my Ph.D. thesis, has been published with the measurements of devices at different wavelengths as it was done in [3]. It shows the benefits of MEMS-based external cavity lasers and stating the achievements accomplished with these devices.

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Molecular gases are highly relevant in healthcare, production control, safety, and environmental monitoring. They often appear in small concentrations. The measurement of trace gases has increasingly become a key technique in those domains. Quartz-enhanced photoacoustic spectroscopy (QEPAS) is a suitable method that can provide the required low detection limits in such applications at comparatively low cost and small size. For mobile implementation, the size of an entire sensor unit matters. In this paper, we present a QEPAS sensor that fits into a standard butterfly package, its characterization, and its application on C H 4 and C O 2 .

An innovative ECDL concept based on MEMS technology in NIR and MIR is presented. Results of laser performance and its application as well as the possibility of ultra-fast tuning through MEMS actuators are shown.