Absorption based Sensors


For these sensors, we generally try to set up TDLAS based systems in spectral regions not accessible directly such as the UV spectral range or the IR. We use non-linear conversion processes in single-pass setups in order to keep the experimental efforts as small as possible. Therefore, we generally use two light sources and perform sum- or difference frequency generation. Usually one light source is weak, but tunable and the other provides the powers in order to generate nW of power at the desired wavelength.

Principle setup of our sensors. The wavelength modulation is optional. The solid state laser system usually consists of two lasers whose outputs are combined by sum- or difference frequency generation.


Prof. Dr. Thomas Walther

Laser und Quantenoptik
Institut für Angewandte Physik
Fachbereich 05 - Physik
Technische Universität Darmstadt
Schlossgartenstr. 7
D-64289 Darmstadt

+49 6151 16-20831 (Sekretariat)

+49 6151 16-20834 (Fax)




Saturday Morning Physics

Gewinnerin des Hauptgewinns 2018 macht gearde Praktikum am Fachbereich

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