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Universität zu Köln
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Mathematisch-Naturwissenschaftliche Fakultät
Fachgruppe Physik

I. Physikalisches Institut

Future Plans

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For the Cologne Carbon Cluster Experiment the infrared region around 2000 cm-1 is very important, because antisymmetric stretching modes of many pure carbon chains are located there. Currently, the spectra are obtained with the use of Tunable Diode Lasers (TDL). These devices have one major disadvantage: They are not tunable over a broad range. Typically, their tuning range (mode-hop free) is about 0.5 to 5 cm-1. That means that for every vibrational transition of each molecule, one needs a specifically manufactured TDL.

In order to extend the spectral coverage in the 2000 cm-1-region, nonlinear frequency conversion will complement the TDL in our system. For that purpose, two near-infrared lasers will be mixed in a nonlinear crystal to get a difference frequency in the desired range. The tunability of the pump lasers is then transferred to the mid-infrared radiation.

For further information please contact Prof. Dr. Thomas Giesen