Dresden 2020 – wissenschaftliches Programm

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UP: Fachverband Umweltphysik

UP 7: Measurement Techniques

UP 7.1: Vortrag

Donnerstag, 19. März 2020, 10:00–10:20, HSZ 105

Miniaturized widely tunable MID-Infrared Quantum-Cascade-Laser for Spectroscopic Applications — •André Merten¹, Stefan Hugger², Marcel Rattunde², Marko Härtelt², André Dreyhaupt¹, Markus Schwarzenberg¹, Robert Barth¹, Ralf Ostendorf², and Jan Grahmann¹ — ¹Fraunhofer IPMS, Maria-Reiche-Straße 2, 01309 Dresden — ²Fraunhofer IAF, Tullastraße 72, 79108 Freiburg

Broadband tuning of MIR-infrared laser radiation from 3 to 10 micron (1000 to 3200 wavenumbers) is a very promising way for spectroscopic study of various gaseous, liquid, or solid species or intermixtures, due to the highly characteristic rotational-vibrational spectral structures. We present a miniaturized widely tunable IR-light source based on an External Cavity Quantum-Cascade-Laser (EC-QCL) in combination with a micro-optical-electrical-mechanics (MOEMS) grating as wavelength selective element. With this concept spectral tuning range in respect to the central wavelength of up to 25% for pulse operation and up to 10% for cw operation, respectively was realized. The bright monochromatic but tunable emission of 100mW and more allows new application for IR-spectroscopy e.g. real-time detection of hazardous liquid or solid species e.g. explosive in up to 3 m distance with a hand-held device collecting the backscattered light. For spectral detection of most gaseous species, however, high spectral resolution is required, which demands also for controlling the cavity length to avoid mode hopping. Were present a concept for mode-hope free tuning and first results of high resolution gas-phase spectroscopy.