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 200cm1 at a bandwidth of the IR-pulses between 15 and 50cm1 and pulse energies up to 0.4μJ. The narrowband mid-IR pulses are well suited for 2D IR spectroscopy.

© 2007 Optical Society of America

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