Enhancing the brilliance of high-harmonic generation

Spitzenpfeil, Robert; Eyring, Stefan; Kern, Christian; Ott, Christian; Lohbreier, Jan; Henneberger, Jan; Franke, N.; Jung, Stefan; Walter, Dominik; Weger, Matthias; Winterfeldt, Carsten; Pfeifer, Thomas; Spielmann, Christian

doi:10.1007/s00339-009-5173-7

Cited by 15 publications

(12 citation statements)

References 23 publications

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“…Here, the extremely bright synchrotron and free-electron laser sources are the go-to solution [20,21]. HHG sources, however, have the benefit of emitting radiation intrinsically in packets of sub-femtosecond duration, an advantage that is reflected by classifying sources in terms of peak brilliance, where HHG becomes competitive [22].…”

Section: Introductionmentioning

confidence: 99%

Limitations of Extreme Nonlinear Ultrafast Nanophotonics

2015

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High-harmonic generation (HHG) has been established as an indispensable tool in optical spectroscopy. This effect arises for instance upon illumination of a noble gas with sub-picosecond laser pulses at focussed intensities significantly greater than 10 12 W/cm 2 . HHG provides a coherent light source in the extreme ultraviolet (XUV) spectral region, which is of importance in inner shell photo ionization of many atoms and molecules. Additionally, it intrinsically features light fields with unique temporal properties. Even in its simplest realization, XUV bursts of sub-femtosecond pulse lengths are released. More sophisticated schemes open the path to attosecond physics by offering single pulses of less than 100 attoseconds duration.Resonant optical antennas are important tools for coupling and enhancing electromagnetic fields on scales below their free-space wavelength. In a special application, placing field-enhancing plasmonic nano antennas at the interaction site of an HHG experiment has been claimed to boost local laser field strengths, from insufficient initial intensities to sufficient values. This was achieved with the use of arrays of bow-tie-shaped antennas of ∼ 100 nm in length. However, the feasibility of this concept depends on the vulnerability of these nano-antennas to the still intense driving laser light. We show, by looking at a set of exemplary metallic structures, that the threshold fluence F th of laser-induced damage (LID) is a greatly limiting factor for the proposed and tested schemes along these lines. We present our findings in the context of work done by other groups, giving an assessment of the feasibility and effectiveness of the proposed scheme.

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Section: Introductionmentioning

confidence: 99%

Limitations of Extreme Nonlinear Ultrafast Nanophotonics

2015

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“…Evolutionary algorithms have been used in numerical calculations of HHG to optimize harmonic yield [27][28][29] and phase matching [30], extend the cutoff [31,32], and to generate single attosecond pulses SAPs [33,34]. The optimization of several experimental HHG setups has also been carried out with self-learning algorithms [35][36][37][38]. In order to study the possibilities offered by light-field synthesizers in attosecond pulse generation, in our numerical optimization we set the goals to produce the shortest possible isolated attosecond pulses, and attosecond double-pulses with variable separation between them.…”

Section: Introductionmentioning

confidence: 99%

Genetic optimization of attosecond-pulse generation in light-field synthesizers

et al. 2014

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We demonstrate control over attosecond-pulse generation and shaping by numerically optimizing the synthesis of few-cycle to subcycle driver wave forms. The optical wave-form synthesis takes place in an ultrabroad spectral band covering the ultraviolet-infrared domain. These optimized driver waves are used for ultrashort singleand double-attosecond-pulse production (with tunable separation), revealing the potentials of the light wave synthesizer device demonstrated by A. Wirth et al. [Science 334, 195 (2011)]. The robustness of the results are also analyzed with respect to attosecond-pulse propagation phenomena.

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“…20]. QPM has been proven experimentally using gas-filled capillaries [21], gas-filled hollow-core fibers with a modulated inner diameter [22], coherent superposition of harmonics generated in two successive sources by the same laser pulse [23], however, with limited or no characterization measurements of gas density profiles in the laser interaction region, which are essential to perform numerical simulations and to understand the QPM process.…”

Section: Introductionmentioning

confidence: 99%

Extreme ultraviolet tomography of multi-jet gas puff target for high-order harmonic generation

et al. 2014

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A volume, tomographic reconstruction of a novel, multi-jet gas puff target, developed for possible applications in high-order harmonic generation (HHG), is presented. The target, produced by pulsed injection of argon gas through nozzle in a form of linearly oriented small orifices, has been characterized in the extreme ultraviolet at 13.5 nm wavelength. Target density estimations were performed, and 3-D representation of pulsed gaseous target has been obtained by combining 2-D shadowgram images, recorded at various rotation angles. More detailed information about higher-order jets, formed as a result of collisions of primary jets, was obtained. Tomographic studies of such type of targets dedicated for HHG have been obtained to our knowledge for the first time.

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Enhancing the brilliance of high-harmonic generation

Cited by 15 publications

References 23 publications

Limitations of Extreme Nonlinear Ultrafast Nanophotonics

Limitations of Extreme Nonlinear Ultrafast Nanophotonics

Genetic optimization of attosecond-pulse generation in light-field synthesizers

Extreme ultraviolet tomography of multi-jet gas puff target for high-order harmonic generation

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