Erlangen 2018 – wissenschaftliches Programm
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K: Fachverband Kurzzeit- und angewandte Laserphysik
K 2: Optical Methods - Light and Radiation Sources
K 2.3: Vortrag
Montag, 5. März 2018, 17:00–17:15, MB HS
Spatio-spectral analysis of ultrashort vortex pulses by radial meta-moments — •Max Liebmann1, Alexander Treffer1, Martin Bock1, Thomas Seiler2, Thomas Elsaesser1, and Ruediger Grunwald1 — 1Max Born Institut for Nonlinear Optics and Short-Pulse Spectroscopy, Berlin — 2FernUniversität Hagen, Optische Nachrichtentechnik, Hagen, Germany
The propagation-dependent spectral structure of ultrashort-pulsed wavepackets with orbital angular moment was characterized by high-resolution and high sensitivity spatially resolved spectroscopy and adapted statistical tools. In particular, a rotation of extremal spectral features around the singularity was observed which is explained by a Gouy phase shift (spectral Gouy rotation [1]). A more complex oscillatory behavior is revealed by advanced statistical tools on the basis of spectral meta-moments [2]. The analysis of radially and azimuthally dependent meta-moments enables to adequately describe fast variations in shape and size of spectral maps like symmetry break and spiral distortion. The propagation time interval for a complete switching between minimum and maximum spatial diameter of the spectral peaks was found to be < 34 fs.
References: 1. M. Liebmann et al., Spectral anomalies and Gouy rotation around the singularity of ultrashort vortex pulses, Opt. Express 25, 26076-26088 (2017). 2. M. Liebmann et al., Spectral anomaly of ultrashort vortex pulses with axially oscillating twist, Photonics West, Complex Light and Optical Forces XII, paper 10549-14, San Francisco, USA (to be submitted, 2018).