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Q: Fachverband Quantenoptik und Photonik
Q 14: Ultrakurze Laserpulse: Erzeugung 1
Q 14.6: Vortrag
Montag, 14. März 2011, 15:45–16:00, SCH 251
Non-collinear Optical Parametric Chirped-Pulse Amplification of ultrashort pulses at 20 k-Hz — •Wataru Kobayashi1, Jiaan Zheng1, Thomas Haman1, Markus Lührmann2, Johannes A. L’huilier2, Richard Wallenstein2, and Helmut Zacharias1 — 1Physikalisches Institut, Westfälische Wilhelms-Universität, Wilhelm-Klemm-Str.10, 48149 Münster, Germany — 2TU Kaiserslautern, Fachbereich Physik, Erwin-Schrödinger-Str.46, 67663 Kaiserslautern, Germany
We present a non-collinear optical parametric chirped-pulse amplification (NOPCPA) system generating
sub-20 fs, 150 µJ optical pulses at a repetition rate of 20 kHz. A Kerr-lens mode-locked Ti:sapphire
oscillator generates 7fs, 2 nJ seed pulses at a repetition rate of 80 MHz. A frequency-doubled
mode-locked Nd:YVO4 amplifier is employed as a pump source [1]. The pump laser is synchronized with the seed
oscillator and generates 250 ps, 1.25 mJ pulses at
the wavelength of 532 nm operating at 20 kHz repetition rate. A grism pair induces negative
2nd-and 3rd-order dispersion and stretches the seed pulse to about 100 ps. An acousto-optic programmable dispersive
filter (AOPDF) follows the stretcher to compensate for the higher order dispersion. A three-stage optical parametric
amplification (OPA) based on type I phase matching in BBO amplifies the seed up to 150 µJ.
The seed pulses are compressed to sub-20 fs by use of Brewster-angle-cut
SF57 glass blocks and a fused silica glass block.
[1] M. Lührmann, C. Theobald, R. Wallenstein, J. A. L’huillier, Opt. Exp. 17, 22761 (2009)