Hannover 2003 – scientific programme
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Q: Quantenoptik
Q 6: Pulserzeugung NIR/Vis/UV
Q 6.8: Talk
Monday, March 24, 2003, 12:45–13:00, B302
Generation of ultrashort tunable UV pulses by chirped sum frequency mixing — •Peter Baum1, Ida Z. Kozma1,2, Stefan Lochbrunner1, and Eberhard Riedle1 — 1LS für BioMolekulare Optik, Sektion Physik, Ludwig-Maxilimians-Universität München — 2Department of Experimental Physics, University of Pecs, Hungary
Efficient generation of ultrashort UV pulses is demonstrated by sum frequency mixing the output of a 1 kHz Ti:sapphire regenerative amplifier (CPA) with the output of a two-stage noncollinearly phase matched optical parametric amplifier (NOPA). The 150 fs long pulses of the CPA are directed through a highly dispersive glass block to introduce the strong chirp, lengthening the pulse duration to 300 fs. Thereby, the length of the CPA pulses matches the uncompressed NOPA pulses [1], and an efficient interaction is achieved for all wavelengths within the tuning range without adjustment of a compressor. Tuning of the NOPA leads to sum frequency mixed pulses in the region from 295 to 370 nm and above 410 nm. The generation of UV pulses is studied in BBO crystals having different thickness. The achieved pulse energy is greater than 3 µJ over the most the UV tuning range, and the broadband spectra of the generated pulses imply that 15-20 fs long pulses can be attained upon proper compression.
[1] E. Riedle, M. Beutter, S. Lochbrunner, J. Piel, S. Spörlein, W. Zinth, Appl. Phys. B 71, 457 (2000)