Generation of narrowband subpicosecond mid-infrared pulses via difference frequency mixing of chirped near-infrared pulses.
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.
Koller
Florian O
FO
Lehrstuhl für BioMolekulare Optik, Department für Physik, Ludwig-Maximilians-Universität München, Oettingenstrasse 67, D-80538 München, Germany.
Haiser
Karin
K
Huber
Markus
M
Schrader
Tobias E
TE
Regner
Nadja
N
Schreier
Wolfgang J
WJ
Zinth
Wolfgang
W
D000465:Algorithms; D000669:Amplifiers, Electronic; D004867:Equipment Design; D007259:Infrared Rays; D007368:Interferometry; D007834:Lasers; D015233:Models, Statistical; D008962:Models, Theoretical; D055095:Optics and Photonics; D019265:Spectroscopy, Near-Infrared / Q000295:instrumentation* / Q000379:methods*; D013997:Time Factors