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Photoionization time delays

Abteilung Pfeifer

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

Attosecond dynamics:
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.

→ Gruppenmitglieder



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)