Lukas Gallmann

Last Name

Gallmann

First Name

Lukas

ORCID

0000-0003-3167-8271

Organisational unit

03920 - Johnson, Steven / Johnson, Steven

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Publications 1 - 10 of 243

Element, site, and carrier specific sub-cycle phonon dynamics induced by ultrafast electron-phonon relaxations in Ti3C2Tx
Neb, Sergej; Shin, Dongbin; Schumacher, Zeno; et al. (2022)
High-power mid-infrared optical parametric chirped-pulse amplifier based on aperiodically poled Mg:LiNbO3
Heese, Clemens; Gallmann, Lukas; Keller, Ursula; et al. (2011)
2011 Conference on Lasers and Electro-Optics (CLEO 2011) : Baltimore, Maryland, USA, 1 - 6 May 2011
Time-resolved Study of Helium Excited States with Attosecond Quantum-Beat Spectroscopy
Lucchini, M.; Zimmermann, T.; Ludwig, A.; et al. (2015)
The European Conference on Lasers and Electro-Optics 2015 : Munich, Germany, 21–25 June 2015
A novel route towards absolute photoemission delays from surfaces by sub-cycle-resolved LAPE
Castiglioni, L.; Greif, M.; Osterwalder, J.; et al. (2013)
Direct measurement of photoemission time-delays in argon and neon
Cirelli, Claudio; Sabbar, M.; Heuser, S.; et al. (2015)
Sources and techniques for attosecond science
Gallmann, Lukas (2011)
High-Power Optical Parametric Chirped-Pulse Amplifier Operating at 2.2 μm
Bigler, Nicolas; Phillips, Christopher R.; Pupeikis, Justinas; et al. (2017)
Proceedings of CLEO: Science and Innovations
Design of quasi-phasematching gratings via convex optimization
Phillips, Christopher R.; Gallmann, Lukas; Fejer, Martin M. (2013)
Optics Express
We propose a new approach to quasi-phasematching (QPM) design based on convex optimization. We show that with this approach, globally optimum solutions to several important QPM design problems can be determined. The optimization framework is highly versatile, enabling the user to trade-off different objectives and constraints according to the particular application. The convex problems presented consist of simple objective and constraint functions involving a few thousand variables, and can therefore be solved quite straightforwardly. We consider three examples: (1) synthesis of a target pulse profile via difference frequency generation (DFG) from two ultrashort input pulses, (2) the design of a custom DFG transfer function, and (3) a new approach enabling the suppression of spectral gain narrowing in chirped-QPM-based optical parametric chirped pulse amplification (OPCPA). These examples illustrate the power and versatility of convex optimization in the context of QPM devices.
Element specific screening dynamics in MoSe2
Schumacher, Zeno; Sato, Shunsuke A.; Neb, Sergej; et al. (2022)
8th International Conference on Attosecond Science and Technology (ATTO VIII). Conference Handbook
Role of electron wavepacket interference in the optical response of helium atoms
Lucchini, Matteo; Herrmann, Jens; Ludwig, André; et al. (2013)
New Journal of Physics
Attosecond control of the optical response of helium atoms to extreme ultraviolet radiation in the presence of moderately strong infrared laser light has been recently demonstrated both by employing attosecond pulse trains (APTs) and single attosecond pulses. In the case of APTs the interference between different transiently bound electron wavepackets excited by consecutive attosecond light bursts in the train was indicated as the predominant mechanism leading to the control. We studied the same physical system with transient absorption spectroscopy using elliptically polarized infrared pulses or APTs with a varying number of pulses down to a single pulse. Our new results are not consistent with this kind of wavepacket interference being the dominant mechanism and show that its role in the control over the photoabsorption probability has to be rediscussed.

Publications 1 - 10 of 243

Lukas Gallmann

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