Hannover 2003 – wissenschaftliches Programm
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Q: Quantenoptik
Q 6: Pulserzeugung NIR/Vis/UV
Q 6.4: Vortrag
Montag, 24. März 2003, 11:45–12:00, B302
Sub-20 fs visible pulses with 750 nJ energy from a 100 kHz NOPA — •Johannes Piel1, Eberhard Riedle1, Lars Gundlach2, Ralph Ernstorfer2, and Rainer Eichberger2 — 1LS für BioMolekulare Optik, Ludwig-Maximilians-Universität München — 2Hahn-Meitner-Institut, Glienicker Strasse 100, Berlin
A single stage noncollinearly phase matched optical parametric amplifier (NOPA; [1]) was used to generate sub-20 fs tunable visible pulses at a repetition rate of 100 kHz. The NOPA was pumped by 50 fs 800 nm pulses with 7 µJ energy (Coherent Rega 9050) and an output pulse energy of 750 nJ was demonstrated. This is considerably higher than previously obtained with a double stage collinear amplifier [2] and the pulse length is dramatically shorter. The NOPA was adjustable from 460 nm to well beyond 1 µm. The NIR wavelengths were also generated on axis and utilized the NIR part of the seed light.
The low energy pump requires a careful optimization of the setup. Only a small fraction of the red pump light is used to generate the seed light while the main part is frequency doubled and chirped to pump the 2 mm BBO amplifier. The amplifier crystal was placed within the Rayleigh range of the focused blue light. The spectral bandwidth was sufficient for sub-20 fs pulses through most of the tuning range and compression in a prism compressor shortens the pulses to this low value.
[1] E. Riedle, M. Beutter, S. Lochbrunner, J. Piel, S. Schenkl, S. Spörlein, W. Zinth, Appl. Phys. B 71 (2000), 457
[2] L. D. Ziegler et al., IEEE J. Quantum Electron. QE-34, 1758 (1998)