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Title: Characterisation of ultrashort pulses
Author: Gianani, Ilaria
ISNI:       0000 0004 7654 2068
Awarding Body: University of Oxford
Current Institution: University of Oxford
Date of Award: 2018
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The main topic of this thesis is the development of new characterization techniques for Ultrashort pulses with particular focus on pulses with complex spectra, often obtained with light pulse synthesisers. More in detail, I have addressed the longstanding problem of retrieving the spectral phase of a pulse which exhibits a spectral gap, i.e. a spectral null larger than any of the spectral features of the pulse. The major challenge in this scenario is attaining a reliable reconstruction of the relative spectral phase between the spectral components. I discuss the different approaches that I have employed in order to achieve this objective. The first result has been the realisation of a low-power XFROG for the charac- terisation of a coherent pulse synthesis source developed by Prof. D. Reid's group at Heriot-Watt University. We used it to characterise, compress, and synchronise the individual components of the source, however the relative phase remained elusive. In order to solve this problem, a radically new characterisation technique needed to be implemented. This consisted in the development of a new algorithm (MICE), which enabled the mutual characterisation of multiple fields, and in a new experimental implementation of the well-known SPIDER technique (SPICE). Both the algorithm and the new technique have been tested experimentally in a proof-of-principle experiment which constitutes the main result of this work. The appeal of these solutions for mastering light synthesisers will likely stimulate further refinements towards making it the standard technique for complex spectra.
Supervisor: Barbieri, Marco Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available
Keywords: Physics