Berlin 2005 – wissenschaftliches Programm

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Q: Quantenoptik und Photonik

Q 35: Erzeugung ultrakurzer Lichtimpulse

Q 35.9: Vortrag

Dienstag, 8. März 2005, 12:45–13:00, HU 1070

Generation of independently tunable phase-locked visible pulses — •Peter Baum¹, Marco Greve², Harald R. Telle², and Eberhard Riedle¹ — ¹LS für Biomolekulare Optik, Ludwig-Maximilians-Universität München — ²Physikalisch-Technische Bundesanstalt, Braunschweig

We demonstrate the generation of multiple ultrashort pulses at different wavelengths that have a locked optical phase relation. To this end, three noncollinear optical parametric amplifiers (NOPAs) are seeded with a common white-light and deliver µJ energy pulses that are independently tunable through most of the visible. The mutual phase coherence is demonstrated by using two of the NOPAs as pump and Stokes waves for coherent anti-Stokes Raman scattering (CARS) in deuterobenzene. The generated anti-Stokes beam is overlapped with the third NOPA beam directly tuned to the anti-Stokes wavelength as a local oscillator. A stable interference pattern is observed and the residual phase fluctuations are measured to be less than 250 mrad (rms). The interference is still observed when the second pump pulse of the CARS process and the local oscillator are both delayed by as much as 1 ps.

The experiments demonstrate that low-repetition-rate lasers like kHz regenerative amplifiers may emit a well defined optical frequency comb spectrum with a kHz line spacing.