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Spatial and temporal aspects of intense attosecond pulses for pump-probe experiments

Wikmark, Hampus LU orcid (2019) In Lund Reports on Atomic Physics
Abstract
Nuclear and electronic dynamics in atoms and molecules are the foundation of many physical processes and chemical reactions. Often, these dynamics take place on timescales so much shorter than those commonly encountered that they are called ultrafast.

In order to study ultrafast phenomena, time-resolved techniques such as pump-probe experiments, involving ultrafast light pulses, are necessary. For these experiments to be successful, the properties of ultrafast light pulses must be carefully controlled and examined in order to discern their influence on the experiment.

This thesis deals with the spatial and temporal properties of XUV light, generated through the process of high-order harmonic generation in... (More)
Nuclear and electronic dynamics in atoms and molecules are the foundation of many physical processes and chemical reactions. Often, these dynamics take place on timescales so much shorter than those commonly encountered that they are called ultrafast.

In order to study ultrafast phenomena, time-resolved techniques such as pump-probe experiments, involving ultrafast light pulses, are necessary. For these experiments to be successful, the properties of ultrafast light pulses must be carefully controlled and examined in order to discern their influence on the experiment.

This thesis deals with the spatial and temporal properties of XUV light, generated through the process of high-order harmonic generation in gases, using an intense IR laser beam. The influence of the spatial properties of this generating laser on the XUV has been studied, as has the influence of the XUV light's spatial properties on its focusability and peak intensity.

The generated high-order harmonics are also used to study physical phenomena such as multiphoton ionization, something that requires high intensities. An instrument for simultaneous studies of ions and electrons produced by photoionization is also presented.

The efforts towards ultrafast pump-probe experiments include designs for interferometer setups to enable these experiments. Some preliminary results of interferometer testing are also given, including a proof of principle of XUV-IR pump-probe experiments on the Lund Laser Centre intense XUV beamline. (Less)
Abstract (Swedish)
Kärn- och elektrondynamik i atomer och molekyler är grunden för många fysiska processer och kemiska reaktioner. Ofta händer denna dynamik på tidsskalor som är så korta att de kallas ultrasnabba.

För att studera ultrasnabba fenomen behövs tekniker som pump-prob-experiment med ultrasnabba ljuspulser. För att dessa experiment ska lyckas måste ljuspulsernas egenskaper noga studeras och styras för att deras inverkan på experimentet ska kunna avgöras.

Den här avhandlingen behandlar de spatiella och tidsmässiga egenskaperna hos XUV-ljus skapat genom högre ordningens övertongenerering i gaser, med hjälp av en intensiv IR-laser. Den inverkan som denna lasers spatiella egenskaper har på XUV-ljuset har studerats, så väl som... (More)
Kärn- och elektrondynamik i atomer och molekyler är grunden för många fysiska processer och kemiska reaktioner. Ofta händer denna dynamik på tidsskalor som är så korta att de kallas ultrasnabba.

För att studera ultrasnabba fenomen behövs tekniker som pump-prob-experiment med ultrasnabba ljuspulser. För att dessa experiment ska lyckas måste ljuspulsernas egenskaper noga studeras och styras för att deras inverkan på experimentet ska kunna avgöras.

Den här avhandlingen behandlar de spatiella och tidsmässiga egenskaperna hos XUV-ljus skapat genom högre ordningens övertongenerering i gaser, med hjälp av en intensiv IR-laser. Den inverkan som denna lasers spatiella egenskaper har på XUV-ljuset har studerats, så väl som XUV-ljusets spatiella egenskaper och hur de påverkar dess fokuserbarhet och intensitet.

De skapade övertonerna har också använts för att studera fysiska fenomen som multifotonjonisering, något som kräver hög intensitet. Ett instrument för samtidiga studier av joner och elektroner frigjorda genom fotojonisering uppvisas också i avhandlingen.

Arbetet för att utföra ultrasnabba pump-prob-experiment inkluderar ritningen av interferometrar som möjliggör dessa experiment. Några tidiga resultat av att testa en av interferometrarna visas också, däribland en demonstration av pump-prob-experiment med XUV- och IR-ljus på Lunds lasercentrums (LLC) strålrör för intensivt XUV-ljus. (Less)
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author
supervisor
opponent
  • Professor Mével, Eric, Université de Bordeaux, France
organization
alternative title
Spatiella och tidsmässiga aspekter av intensiva attosekundpulser för pump-prob-experiment
publishing date
type
Thesis
publication status
published
subject
keywords
ultrafast lasers, ultrafast optics, attosecond pulses, pump-probe experiments, XUV light, XUV focusing, wavefront sensing, XUV optics, X-ray optics, Fysicumarkivet A:2019:Wikmark, ultrasnabba lasrar, attosekundspulser, pump-prob-experiment, XUV-ljus, vågfrontmätningar, XUV-optik, Röntgen-optik
in
Lund Reports on Atomic Physics
issue
556
pages
241 pages
publisher
Department of Physics, Lund University
defense location
Rydbergsalen, Fysicum, Professorsgatan 1, Lund University, Faculty of Engineering LTH
defense date
2019-05-17 09:15:00
ISSN
0281-2762
ISBN
978-91-7895-042-3
978-91-7895-043-0
language
English
LU publication?
yes
id
e0078770-83c9-4201-9787-93a35ad76bb3
date added to LUP
2019-04-10 14:04:16
date last changed
2019-07-05 16:19:36
@phdthesis{e0078770-83c9-4201-9787-93a35ad76bb3,
  abstract     = {{Nuclear and electronic dynamics in atoms and molecules are the foundation of many physical processes and chemical reactions. Often, these dynamics take place on timescales so much shorter than those commonly encountered that they are called ultrafast.<br/>    <br/>    In order to study ultrafast phenomena, time-resolved techniques such as pump-probe experiments, involving ultrafast light pulses, are necessary. For these experiments to be successful, the properties of ultrafast light pulses must be carefully controlled and examined in order to discern their influence on the experiment.<br/><br/>    This thesis deals with the spatial and temporal properties of XUV light, generated through the process of high-order harmonic generation in gases, using an intense IR laser beam. The influence of the spatial properties of this generating laser on the XUV has been studied, as has the influence of the XUV light's spatial properties on its focusability and peak intensity.<br/>    <br/>    The generated high-order harmonics are also used to study physical phenomena such as multiphoton ionization, something that requires high intensities. An instrument for simultaneous studies of ions and electrons produced by photoionization is also presented.<br/>    <br/>    The efforts towards ultrafast pump-probe experiments include designs for interferometer setups to enable these experiments. Some preliminary results of interferometer testing are also given, including a proof of principle of XUV-IR pump-probe experiments on the Lund Laser Centre intense XUV beamline.}},
  author       = {{Wikmark, Hampus}},
  isbn         = {{978-91-7895-042-3}},
  issn         = {{0281-2762}},
  keywords     = {{ultrafast lasers; ultrafast optics; attosecond pulses; pump-probe experiments; XUV light; XUV focusing; wavefront sensing; XUV optics; X-ray optics; Fysicumarkivet A:2019:Wikmark; ultrasnabba lasrar; attosekundspulser; pump-prob-experiment; XUV-ljus; vågfrontmätningar; XUV-optik; Röntgen-optik}},
  language     = {{eng}},
  month        = {{04}},
  number       = {{556}},
  publisher    = {{Department of Physics, Lund University}},
  school       = {{Lund University}},
  series       = {{Lund Reports on Atomic Physics}},
  title        = {{Spatial and temporal aspects of intense attosecond pulses for pump-probe experiments}},
  url          = {{https://lup.lub.lu.se/search/files/62889948/Hampus_Wikmark_web.pdf}},
  year         = {{2019}},
}