München 2004 – scientific programme

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Q: Quantenoptik und Photonik

Q 20: Poster Ultrakurze Lichtimpulse

Q 20.4: Poster

Tuesday, March 23, 2004, 14:00–16:00, Schellingstr. 3

Generation of ultrashort laser pulses at 1 kHz repetition rate with 7 mJ pulse energy using a liquid nitrogen cooled Ti:Sapphire amplifier system — •M. Silies, J. Kutzner, G. Tsilimis, J. Brockkamp, and H. Zacharias — Physikalisches Institut, Westfälische Wilhelms-Universtität, Münster, Wilhelm-Klemm-Str. 10, 48149 Münster

We report on the development of a compact, table-top laser source at 1 kHz repetition rate based on Ti:Sapphire with a pulse energy of 7 mJ as a tool to generate hard x-rays as well as High Harmonics.

The set-up consists of a commercially available oscillator-amplifier CPA system and a second multipass amplifier with the Ti:Sapphire crystal cooled by liquid nitrogen to 93 K to increase the thermal conductivity and therefore avoid the thermal lens formed by the pumping lasers. The output energy of 7 mJ was obtained while pumping the crystal with total 40 W of two frequency doubled Nd:YLF lasers. The following pulse compressor consists of two triple-prism sequences, compressing the stretched laser pulses to nearly transform-limited 45 fs pulses. The performance of the nitrogen cooled amplifier concerning pulse duration and pulse energy is discussed and compared to theoretical calculations.