Hannover 2013 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 43: Poster II
Q 43.21: Poster
Wednesday, March 20, 2013, 16:00–18:30, Empore Lichthof
Tm/Ho codoped fiber laser for sensitive intracavity absorption spectroscopy — •Peter Fjodorow, Ortwin Hellmig, Svetlana Kuznetsova, Klaus Sengstock, and Valeri Baev — Institut für Laserphysik, Universität Hamburg, Germany
The simultaneous incorporation of Thulium and Holmium ions into laser materials, not only gives the possibility to build up a laser source emitting in the spectral range of 1.8 - 2.2 µm [1], where many molecules show strong absorption, but it also enables the use of easily available diode lasers at 800 nm as pump sources.
We demonstrate a broadband Tm/Ho silica fiber laser, tunable by an intracavity lens and emitting in the above mentioned spectral region. By performing intracavity absorption measurements with this laser system, various gases, such as H2O, CO2, N2O, CH4, NO, NH3, HCl, HBr and C2H2, can be simultaneously detected with a ppb sensitivity and without the need for clean samples. The recording time for the emission spectrum of an individual laser pulse can be set to 50 µs, allowing to perform very sensitive in situ measurements of nonstationary processes. This laser system can be applied, e.g. for environmental and medical purposes, as well as for the study of combustion processes.
This project is supported by DFG within GRK 1355.