Ultracold and Ultrafast

Photo: UHH, Esfandiari

Left to right: Dr. Mario Großmann, Julian Fiedler, Maximilian Floßmann, Lasse Paulsen, Marlon Hoffmann, Jette Heyer, Dr. Juliette Simonet, Prof. Dr. Klaus Sengstock, Prof. Dr. Markus Drescher, Dr. Philipp Wessels-Staarmann. Not shown: Aaron Große Enking, Jan Newiger, Harry Chris Raymond.

Summary

Ultrashort laser pulses enable us to observe and manipulate matter on very short time scales, whereas ultracold atoms permit experiments with high precision and controllability. This project is carried out in close collaboration with the group of Prof. Dr. Markus Drescher and aims at manipulating macroscopic quantum systems on ultrafast time-scales by, for example, instantaneously introducing long-range interactions by ionizing atoms in a quantum gas.

Impressions

Photo: © Jette Heyer, AG Sengstock & AG Drescher / UHH

Electrodes for charged particle analysis.

Photo: UHH/Esfandiari

Upgrading the cooling laser system.

Photo: UHH/Esfandiari

Vacuum chamber for charged particle analysis.

Photo: UHH/Wessels-Staarmann

Ultrashort laser pulses for studying the strong-field ionization of ultracold atoms.

Photo: UHH/Großmann

Ultrafast electron cooling in an ultracold microplasma.

Photo: DESY 2015, Lars Berg

Cooling laser system for making, manipulating and detecting ultracold atoms.

News & press releases

Catching an ion with a quantum gas
News outlet from 5 April 2024.
An Ultracold Plasma Models the Universe's Most Extreme Places
WIRED Science Story from 17 March 2021.
Electron refrigerator: Ultrafast cooling mechanism discovered in novel plasma
News outlet from 26 January 2021.
Ultracold atoms and ultrafast lasers: Hamburg scientists combine experimental expertise
Press release from 4 July 2018.

Patents

M. Drescher, J. Heyer, and P. Wessels-Staarmann,
Electrostatic deflector for charged particle optics,
European Patent Application EP 4 303 907 A1 (2024).

Theses

PhD theses

Strong-field ionization of ultracold quantum gases:
From ultracold plasma to Rydberg gases
PhD thesis of Mario Großmann (2023).
Interfacing quantum gases with femtosecond laser pulses:
From strong-field ionization to ultracold plasma
PhD thesis of Tobias Kroker (2021).
Ultracold Gases in Strong Light Fields of Femtosecond Laser Pulses.
PhD thesis of Berhnard Ruff (2017).
Ultracold ⁸⁷Rb: From quantum metrology to two-photon ionisation.
PhD thesis of Alexander Grote (2016).

Master / Diploma theses

Event-based detection for an ion- and electron-coincidence unit for ultracold atoms.
Master thesis of Amir Khan (2023).
A Coincidence Electron Velocity Map Imaging and Ion Microscopy Unit for Ultracold Atoms.
Master thesis of Jette Heyer (2021).
Rydberg dressing of a Bose -Einstein condensate for the trapping of a single ion.
Master thesis of Julia Bergmann (2020).
Lasersystem zum Rydberg-Dressing eines Bose-Einstein-Kondensats.
Master thesis of Julian Fiedler (2020).
A quantum gas machine for local photoionization of ultracold ⁸⁷Rb on ultrafast time-scales.
Master thesis of Jakob Butlewski (2018).
Aufbau eines abgeschirmten Elektronen und Ionendetektionssystems zur Materiewelleninterferometrie.
Master thesis of Steffen Pehmöller (2017).
The Quantum Zeno Effect in the Local Photoionisation of a Bose Einstein Condensate.
Master thesis of Janine Franz (2016).
Photoionisation ultrakalter ⁸⁷Rb-Atome in starken Laserfeldern.
Master thesis of Tobias Kroker (2016).
Aufbau und Charakterisierung einer Hybridfalle für ultrakalte Quantengase.
Master thesis of Harry Krüger (2015).
Optimierung einer Quantengasmaschine zur Ionisation eines Bose-Einstein-Kondensats durch ultrakurze Laserpulse.
Master thesis of Harald Blazy (2015).

Bachelor theses

Data Analysis for Coincidence Detection of Photoionization Fragments
Bachelor thesis of Roberto De la Cruz Gonzales (2024).
Compact laser system for cooling ⁸⁷Rb atomic gases
Bachelor thesis of Cornelius Fabig (2024).
Setup of an optical dipole trap for quantum gases
Bachelor thesis of Daniel Martins (2023).
Reconstruction algorithms for an electron velocity map imaging spectrometer for ultracold atoms.
Bachelor thesis of Lasse Paulsen (2022).
Effiziente RF evaporative Kühlung von Rubidium-Atomen bis zur Bose-Einstein-Kondensation.
Bachelor thesis of Kamila Murat (2022).
Effiziente Laserkühlung von Rubidium-Atomen.
Bachelor thesis of Marlon Hoffmann (2022).
Gittermonochromator zum Strecken ultrakurzer Lichtpulse.
Bachelor thesis of Victoria Dietz (2021).
Graue Melasse zum Sub-Dopplerkühlen von Rubidium-87.
Bachelor thesis of Linn Hamester (2020).
Eine Detektionseinheit für geladene Teilchen als Schnittstelle zwischen ultrakalten Atomen und Femtosekundenlaserpulsen.
Bachelor thesis of Donika Imeri (2019).
Abbildungssysteme für Ultrakalte Quantengase.
Bachelor thesis of Jette Heyer (2018).
Aufbau einer Detektoreinheit zum Nachweis von Materiewelleninterferenz langsamer Elektronen.
Bachelor thesis of Julian Fiedler (2017).
Aktive Magnetfeldkompensation für Photoionisation am ultrakalten Quantengas.
Bachelor thesis of Tim Anlauf (2016).
Herstellung und Charakterisierung effizienter Konversionsdynoden zum Nachweis einzelner Ionen.
Bachelor thesis of Tara Lampe (2016).
Aufbau und Charakterisierung einer 2D-Strahllagenstabilisierung.
Bachelor thesis of Mario Neundorf (2016).
Aufbau und Test eines bildgebenden Elektronendetektors für Ionisationsexperimente im Laser-Doppelfokus.
Bachelor thesis of Steffen Pehmöller (2015).
Entwicklung und Aufbau einer optischen Pinzette für ultrakalte Atome.
Bachelor thesis of Maik Schröder (2015).
Optischer Aufbau zur Erzeugung eines sub-Mikrometer Doppelfokus.
Bachelor thesis of Jasper Frohn (2014).