Darmstadt 2008 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 54: Poster Laserentwicklung
Q 54.10: Poster
Thursday, March 13, 2008, 16:30–19:00, Poster C2
Tunable mid-IR CW narrowband laser source for molecular spectroscopy — •Sergey Vasilyev1, Alexander Nevsky1, Stephan Schiller1, Arnaud Grisard2, Eric Lallier2, David Faye2, Zhaowei Zhang3, Deyuan Shen3, Andrew Clarkson3, Morten Ibsen3, Peter Geiser4, Axel Bohman4, Peter Kaspersen4, and Juan Jiménez5 — 1Institute for Experimental Physics, Düsseldorf, Germany — 2Thales Research and Technology, Palaiseau Cedex, France — 3Optoelectronics Research Centre, University of Southampton, UK — 4Norsk Elektro Optikk, Lørenskog, Norway — 5University of Valladolid, Spain
The objective of our research project is the development of a widely tunable (5 - 15 µm) narrowband mid-IR laser source based on a nonlinear down conversion of 1.5 - 2.0 µm laser radiation using difference frequency generation (DFG) and optical parametric generation (OPO) in a Orientation-Patterned Gallium Arsenide (OP-GaAs) crystal. The OP-GaAs combines a high nonlinearity, wide transparency range, and high thermal conductivity with merits of a quasi-phase-matching technique. Recently a method was developed for fabrication of large-size OP-GaAs structures.
Tunable mid-IR source based on the DFG between a narrowband broadly tunable EDFA (10 W) and thulium doped fiber laser MOPA (1 W) has been developed. DFG output wavelength was tunable from 7.5 µm to 8.2 µm with pm precision. Mid-IR output power of 0.1 - 0.3 mW has been measured. Spectroscopic capabilities of the mid-IR source were tested by measuring of CH4 absorption spectra.