Implementation of a setup for broadband femtosecond transient absorption with kHz acquisition rate


Bachelor Thesis, 2013
64 Pages, Grade: 1,1

Abstract or Introduction

It is the intention of this thesis to firstly present a theoretical modelling of how 400-nm pump pulses can be generated from a 800-nm fundamental, yielding the shortest possible pulses at a high conversion efficiency. Secondly, I describe how three different types of optical autocorrelation and the information about the pulse spectra and durations they incorporate can be used to characterise our present pulse amplification system. Thirdly, I will present a newly-implemented transient absorption setup which has been distinguished with respect to its noise sensitivity and to the chirp the probe beam accumulates after the supercontinuum generation process. Finally, I will discuss the transient absorption signature of a biomimetic photoswitch (dMe-MeO-NAIP) recorded with the new setup.

Since its beginnings in the late 1980s, ultrafast laser spectroscopy and, in particular, transient absorption has become a standard experimental method. It allows to investigate the photochemical properties of molecules with a temporal resolution down to the femtosecond timescale. However, major challenges for the implementation of a transient absorption setup continue to be the maintenance of pulse durations as short as possible and, on the other hand, noise prevention.

Details

Title
Implementation of a setup for broadband femtosecond transient absorption with kHz acquisition rate
College
Free University of Berlin  (Fakultät für Physik)
Grade
1,1
Author
Year
2013
Pages
64
Catalog Number
V491806
Language
English
Series
Aus der Reihe: e-fellows.net stipendiaten-wissen
Tags
Transient Absorption, Femtosecond Spectroscopy, Quantum Chemistry, Ultafast Optics
Quote paper
Maximilian Sohmen (Author), 2013, Implementation of a setup for broadband femtosecond transient absorption with kHz acquisition rate, Munich, GRIN Verlag, https://www.grin.com/document/491806

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