Summer semester 2026
Organiser: Uwe Bandelow
Research seminar "Mathematical Models of Photonics"
Enrollment to the seminar: Students who want to attend this seminar for the modules P27, P28 and P35.3 should write an email to uwe.bandelow@hu-berlin.de. Please write as subject MathPho, your name, enrollment number, course of study.
I will save the email address and use it to send information regarding the seminar if this is not explicitly objected. You can cancel your enrollment to the seminar via email as well.
Proposed seminars
Thursday 23.04.2026, 10:00 (WIAS: Anton-Wilhelm-Amo-Straße 39-Erhard Schmidt lecture room, ground floor)Lasse Ermoneit, WIAS BerlinThursday 04.08.2026, 14:00 (WIAS: Anton-Wilhelm-Amo-Straße 39-Erhard Schmidt lecture room, ground floor)Epitaxial profile optimization in Si/SiGe heterostructures: Engineering valley splitting for spin qubits
TBA.
Dr. Maria Chernysheva, Leibniz-Institut für Photonische Technologien e.V.Thursday 11.08.2026, 10:00Mamyshev oscillators: Towards self-starting generation
Mamyshev oscillators offer a particularly valuable platform for investigating the phenomenon of ultrashort pulse formation because they do not rely on conventional saturable absorbers. Instead, pulse formation is governed by self-phase modulation in normal-dispersion fibres combined with periodic offset spectral filtering. Achieving self-starting in these systems is challenging. In my talk, I will first present the self-starting, all-fibre, all-normal-dispersion Thulium-doped Mamyshev oscillator operating near 1.9 µm. The real-time measurements and numerical simulations reveal the build-up pathway from noise through transient multi-pulsing and pulse competition to a stationary noise-like envelope. Then I will discuss the new developemnts in hybrid laser systems employing SOA as a gain media within fibre cavities, built in a compact Fabry-Perot design or righ configuraiton. Both systems incorporate a highly nonlinear passive near-zero normal-dispersion fibre, developed at IPHT for this project. I will present current limitations towards achieving stable ultrashort pulse generation.
Thursday 18.08.2026, 10:00
Thursday 25.08.2026, 10:00
Thursday 01.09.2026, 10:00
Thursday 08.09.2026, 10:00
Thursday 15.09.2026, 10:00
Thursday 22.09.2026, 10:00
Thursday 29.09.2026, 10:00