München 2004 – wissenschaftliches Programm
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Q: Quantenoptik und Photonik
Q 26: Ultrakurze Lichtimpulse: Erzeugung
Q 26.6: Vortrag
Dienstag, 23. März 2004, 17:45–18:00, HS 223
12 fs pulses from a cw-pumped 200 nJ Ti:sapphire amplifier at a variable repetition rate of up to 4 MHz — •Ruppert Huber1, Florian Adler1, Alfred Leitenstorfer1, Matthias Beutter2, Peter Baum2, and Eberhard Riedle2 — 1Physik-Department E11, TU München — 2Lehrstuhl für BioMolekulare Optik, Sektion Physik Ludwig-Maximilians-Universität München
We demonstrate a novel compact femtosecond Ti:sapphire laser system operating at repetition rates between 10 kHz and 4 MHz. The scheme is based on the combination of a broadband cavity-dumped oscillator and a double pass Ti:sapphire amplifier pumped by a low noise cw solid-state laser. Amplified pulses with an extremely smooth spectrum, a duration of only 12 fs and less than 0.25 % rms fluctuation are generated in a beam with M2 < 1.2 . Maximum pulse energies of 210 nJ and an average output power of as much as 720 mW are achieved. This output energy is sufficient to generate a stable continuum in a sapphire disk. The system has already been used successfully for THz spectroscopy with largely improved sensitivity and the use for molecular pump-probe spectroscopy is in preparation.