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Surface dominance in high harmonic generation in AlN thin film
2021 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC)
Year: 2021 | Conference Paper |
We performed measurements using the 17 fs pulses of a Ti:sapphire frequency comb at 108 MHz repetition rate. The beam was focused to a 30-nm-thick AlN (0001) film, grown on sapphire substrate. The on-axis peak intensity of 1.0±0.2 TW/cm 2 was suitable to observe intense 3 rd and 5 th order harmonics in the ultraviolet (267 nm) and vacuum ultraviolet (160 nm), respectively [1] .Show More
Optimizing phase matching of high-order harmonic radiation in the range up to 1 keV
J. Seres;E. Seres;B. Landgraf;B. Ecker;B. Aurand;T. Kuehl;C. Spielmann
2013 Conference on Lasers & Electro-Optics Europe & International Quantum Electronics Conference CLEO EUROPE/IQEC
Year: 2013 | Conference Paper |
Phase matching is indispensible for the efficient generation high-order harmonic radiation (HHG), especially in the range of several-100-eV. Recently it has been theoretically predicted that perfect pressure induced phase matching cannot be realized in helium in the 0.2-1 keV spectral range using 800 nm light pulses. In this contribution, a detailed experimental study of the phase mismatch is pres...Show More
Intra-cavity extreme ultraviolet light source based on a mode locked Ti:Sapphire oscillator with 9.4 MHz repetition rate
2013 Conference on Lasers & Electro-Optics Europe & International Quantum Electronics Conference CLEO EUROPE/IQEC
Year: 2013 | Conference Paper |
Sources based on high harmonic generation (HHG) deliver line and/or continuum radiation up to few keV with excellent spatial characteristic and repetition rate up to few kHz. These sources have been successfully applied for x-ray absorption spectroscopy with sub-20 fs temporal resolution. However, for time-resolved photoelectron spectroscopy there is a need for pulsed EUV sources with MHz repetiti...Show More
Laser-driven parametric amplification of soft X-rays
J. Seres;E. Seres;D. Hochhaus;B. Ecker;B. Aurand;D. Zimmer;B. Zielbauer;B. Landgraf;V. Bagnoud;T. Kuehl;C. Spielmann
2011 Conference on Lasers and Electro-Optics Europe and 12th European Quantum Electronics Conference (CLEO EUROPE/EQEC)
Year: 2011 | Conference Paper |
For time-resolved spectroscopy, ultra-short pulses can be directly generated with lasers and the wavelength range can be extended with nonlinear frequency conversion techniques. For covering the shorter wavelength range, XFEL's and plasma based x-ray lasers are attractive candidates. However their stability, coherence and beam quality is limited and can be improved e.g. by seeding with coherent hi...Show More
Laser-driven parametric amplification of soft X-rays
J. Seres;E. Seres;D. Hochhaus;B. Ecker;B. Aurand;D. Zimmer;B. Zielbauer;B. Landgraf;V. Bagnoud;T. Kuehl;C. Spielmann
Year: 2011 | Conference Paper |
High-power Ti:sapphire oscillator for a MHz EUV source
2011 Conference on Lasers and Electro-Optics Europe and 12th European Quantum Electronics Conference (CLEO EUROPE/EQEC)
Year: 2011 | Conference Paper |
We have developed high intensity oscillator capable for generating ultrashort <;20 fs EUV pulses. The EUV radiation should be generated in an additional intra cavity focus in which we put a gas jet. Only the focusing mirrors for second focus and the gas jet are put in a small vacuum chamber equipped with two Brewster windows to couple in the light.Show More
High order harmonic generation in a He+ ion channel
CLEO/Europe - EQEC 2009 - European Conference on Lasers and Electro-Optics and the European Quantum Electronics Conference
Year: 2009 | Conference Paper |
With intense laser pulses it is possible to generate x-ray radiation up to 3–4 keV [1] via high harmonic generation (HHG). The cut-off can be further extended by HHG from ions and solving the phase matching problem. Quasi phase matching [2, 3] or non-adiabatic phase matching [1] has been successfully demonstrated for HHG from neutral atoms. Here we describe a new approach for HHG with extended cut...Show More
Sub-20 fs time resolved EXAFS at the Si K edge
2007 European Conference on Lasers and Electro-Optics and the International Quantum Electronics Conference
Year: 2007 | Conference Paper |
From the modulation in the absorption spectrum it is possible to estimate the atomic distance as described in the frame of extended x-ray absorption fine structure spectroscopy (EXAFS). By combining EXAFS with methods of conventional pump-probe spectroscopy it is possible to follow atomic motion such as structural modification after the excitation with an intense laser pulse. The structural modifi...Show More
X-ray absorption spectroscopy in the keV range with laser generated high harmonic radiation
2007 European Conference on Lasers and Electro-Optics and the International Quantum Electronics Conference
Year: 2007 | Conference Paper |
The authors demonstrated that by applying non-adiabatic-self-phase-matching the photon flux and cut-off can be increased allowing EXAFS measurements in the keV range. By evaluating the fine structure of the static X-ray absorption spectra near the L-edge of Ti and Cu, and the K-edge of Al and Si we determined the atomic distance of amorphous samples.Show More
Ultrafast soft X-ray absorption spectroscopy
EQEC '05. European Quantum Electronics Conference, 2005.
Year: 2005 | Conference Paper |
This paper demonstrates time resolved X-ray absorption spectroscopy with a resolution in the sub-20 fs range around the L-edge (100 eV) of amorphous silicon (XANES) and gathered information beyond the L-edge about the atomic structure with EXAFS. This setup can be easily adapted for other materials such as carbon, and open the way to gain insight into fast dynamical processes of large organic mole...Show More
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