Hannover 2003 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe

Q: Quantenoptik

Q 6: Pulserzeugung NIR/Vis/UV

Q 6.6: Vortrag

Montag, 24. März 2003, 12:15–12:30, B302

Suppression of pre- and postpulses in multipass Ti:sapphire amplifier — •Jinxiong Wang, Martin Weinelt, and Thomas Fauster — Lehrstuhl für Festkörperphysik, Universität Erlangen-Nürnberg, Staudtstr. 7/A3, 91058 Erlangen

Femtosecond Ti:sapphire multipass amplifiers are often subject to amplified spontaneous emission (ASE), pre- and postpulses[1]. In this contribution, an amplifier producing 1.8mJ/pulse, 22fs pulses at repetition rate 1kHz and 17W pump power is described. Unlike the original configuration of the multipass amplifier[1], a two row beam path was designed in the Ti:sapphire multipass amplifier, which eliminates the parasitic pulses effectively without reduction on power. The possible parasitic pulses in the amplifier are discussed and the orders of magnitude of pre- and postpulses are estimated by diffraction theory. The possible depolarization after the seed beam passing obliquely through the Ti:sapphire crystal is calculated and proven to be negligible. The output beam from the multipass amplifier is well polarized, with negligible temporal and spatial chirp, and the output power is among the highest from single-stage multipass amplifiers. The good performance is also demonstrated by the high efficiency of subsequent OPA application.

[1] S. Backus et al. Optics Letters, Vol.20, No.19, Oct.1, 1995(2000)