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K: Fachverband Kurzzeit- und angewandte Laserphysik
K 4: Poster (joint session K/Q)
K 4.5: Poster
Dienstag, 3. März 2026, 17:00–19:00, Philo 1. OG
Time-Trapping Towards Manipulation of Single-Photon Wavepackets — •Marvin Franzke1, Fridolin Geesman1, David Zuber1,2, Ihar Babushkin1,2,3, and Uwe Morgner1,2 — 1Leibniz University Hannover, Institute of Quantum Optics, Welfengarten 1, 30167 Hannover, Germany — 2Cluster of Excellence PhoenixD (Photonics, Optics, and Engineering-Innovation Across Disciplines), 30167 Hannover, Germany — 3Max Born Institute, Max-Born-Straße 2a, 10117 Berlin, Germany
In this project we are going to demonstrate experimentally a recent, theoretically suggested way of trapping and manipulating femtosecond-long weak pulses. A soliton propagating in a gas-filled hollow-core fiber creates a refractive index potential capable of trapping a much weaker pulse or even single photons. A weak pulse, described by linear optics, would always undergo dispersion, but trapping inside a soliton, described by nonlinear optics, allows for a dispersion-free propagation. Furthermore, trapping allows manipulation of the weak pulse by manipulating the soliton trap, since the weak pulse follows adiabatically. Here, two components of the experimental setup are discussed: an optical parametric amplifier (OPA) delivering the pulses, and diffractive optical elements (DOEs) converting the Gaussian mode from the OPA to higher order modes. These higher order modes are a crucial feature because the soliton and the weak pulse are at different wavelengths. By choosing different higher order modes for them and tuning the gas pressure, group velocity matching can be achieved. Furthermore, theoretical considerations about time-trapping are presented.
Keywords: optical parametric amplifier; higher order modes; hollow-core fiber; pulse-trapping