Generation of narrowband subpicosecond mid-infrared pulses via difference frequency mixing of chirped near-infrared pulses |
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Authors: | Koller Florian O Haiser Karin Huber Markus Schrader Tobias E Regner Nadja Schreier Wolfgang J Zinth Wolfgang |
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Institution: | Lehrstuhl für BioMolekulare Optik, Department für Physik, Ludwig-Maximilians-Universit?t München, Oettingenstrasse 67, D-80538 München, Germany. |
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Abstract: | The widely used setup for the generation of femtosecond infrared (IR) pulses based on parametric amplifiers (OPAs) and difference frequency mixing (DFM) is extended to produce tunable narrowband mid-IR pulses. The insertion of pairs of silicon prisms after the OPA induces adjustable chirp, which leads to the generation of narrowband pulses in the DFM stage. Rapid tunability of the mid-IR wavelength via a computer-controllable actuator can be achieved in a range of approximately 200 cm(-1) at a bandwidth of the IR-pulses between approximately 15 and approximately 50 cm(-1) and pulse energies up to 0.4 microJ. The narrowband mid-IR pulses are well suited for 2D IR spectroscopy. |
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