Photoionization time delays
Junior Research Group (NWG)
Dr. Anne Harth
My research interests include:
- Fundamental light-matter interaction
- Attosecond processes in photoionization
- High-repetition rate high-order harmonic generation
- Optical parametric amplifiers
- (Ultra-)short pulse generation, characterisation and manipulation
Direct observation of ultrafast electron motion in atomic or molecular systems is an aspect of fundamental physics and is achievable thanks to the generation of attosecond pulses in the XUV spectral range. A key advantage of attosecond pulse trains over isolated attosecond pulses is their high spectral resolution, while high temporal resolution is still retained.
My aim is to investigate photoionization in atoms and molecules using attosecond pulse trains. Currently, I am interested in continuum-continuum transitions near the ionization threshold.
SoSe2021, Veranstaltungsnummer: 130000202111218
Anmeldung via: https://uebungen.physik.uni-heidelberg.de/v/1339
Die Vorlesung wird online stattfinden.
Exploring the nonlinear world
(#NonlinearOptics #UltrashortPulses #AttosecondTimeDelays)
Every day we experience linear optical phenomena, eg. when the sun light propagates through the window glass material. Alone this process if full of fascinating physical facts. In this lecture we will step out of the linear-world-box and will enter the nonlinear world by discussing frequency conversion also called low order harmonic generation, ultrashort pulse generation, amplification and characterization and finally the generation of high order harmonics(HHG). Applications of these nonlinear processes in solids and gas media are manifold. They lay e.g. in the possibility to build high power and ultra-short laser pulses for medical and industrial operations. Additionally, these nonlinear phenomena are a key to push the fundamental research to before unreachable time scales and triggers to ask further questions regarding the most basic processes of light matter interaction.
15 April 2021 Introduction
22 April 2021 Optical polarization (Maxwell, susceptibility, refractive index)
29 April 2021 Low-order harmonics (SHG, THG, SPM, phase matching, BBO, PPLN)
6 May 2021 L1 Ultrashort pulses (mode locking, dispersion, DCM, CEP f-2f)
20 May 2021 L2 Control (pulse shaper, pulse characterization, white light interferometer)
27 May 2021 L3 Laser amplifiers (CPA, post compression, parametric amplifiers)
10 June 2021 High-order harmonics (attosecond pulses, atto-chirp, femto-chirp)
17 June 2021 Photoionization (Quantum path interference, perturbation theory)
24 June 2021 Methods (RABBITT, Streaking, TA)
1 July 2021 Cold atoms meet ultrashort light (Dr. Dorn)
8 July 2021 Attosecond transient absorption spectroscopy (Dr. Ott)
15 July 2021 Ultrafast LC dynamics (Dr. Cattaneo)
22 July 2021 Time resolved photoionization: RABBITT (Dr. Harth)