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Adaptive shaping of laser beams for high-harmonic generation applications / BENJAMIN HEATH

Swansea University Author: BENJAMIN HEATH

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DOI (Published version): 10.23889/SUthesis.61184

Abstract

This thesis explores the use of adaptive optics to create tailored laser profiles to drive the process of high-order harmonic generation (HHG).A deformable mirror controlled by a genetic, simulated-annealing algorithm (SA), and a genetic-annealing hybrid algorithm (HA) have been used to create super...

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Published: Swansea 2022
Institution: Swansea University
Degree level: Doctoral
Degree name: Ph.D
Supervisor: O’Keeffe, Kevin
URI: https://cronfa.swan.ac.uk/Record/cronfa61184
first_indexed 2022-09-12T12:07:06Z
last_indexed 2023-01-13T19:21:48Z
id cronfa61184
recordtype RisThesis
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spelling 2022-09-12T13:33:19.5142877 v2 61184 2022-09-12 Adaptive shaping of laser beams for high-harmonic generation applications 0fe342bb6ab0a14035d672201735c399 BENJAMIN HEATH BENJAMIN HEATH true false 2022-09-12 This thesis explores the use of adaptive optics to create tailored laser profiles to drive the process of high-order harmonic generation (HHG).A deformable mirror controlled by a genetic, simulated-annealing algorithm (SA), and a genetic-annealing hybrid algorithm (HA) have been used to create super-Gaussian intensity profiles of orders ranging from P = 1 to P = 2 using a low-powered He-Ne laser. Between these three algorithms it was found that there is a compromise between the algorithm performance and reliability, and the algorithm complexity.Simulated super-Gaussian beam-shaping with a phase-only SLM has been performed with a SA and HA algorithm and compared to a known π-shift method. The HA has shown an improvement in super-Gaussian quality for high orders, P ≈ 2.6.Simulations of HHG driven by super-Gaussian driver fields have been made using both the simple dipole model and the strong field approximation. It has been shown that HHG beam divergence decreases with increased order P . The fringe visibility has also been calculated as a measure of coherence. E-Thesis Swansea Adaptive optics, beam shaping, high-order harmonic generation, HHG, high powered lasers, laser physics, super-Gaussian, learning algorithms 5 9 2022 2022-09-05 10.23889/SUthesis.61184 ORCiD identifier: https://orcid.org/0000-0002-9460-3042 COLLEGE NANME COLLEGE CODE Swansea University O’Keeffe, Kevin Doctoral Ph.D 2022-09-12T13:33:19.5142877 2022-09-12T13:02:44.9489580 Faculty of Science and Engineering School of Biosciences, Geography and Physics - Physics BENJAMIN HEATH 1 61184__25113__3925974d1e90416a8abe1c4b69554457.pdf Heath_Benjamin_PhD_Thesis_Final_Redacted_Signature.pdf 2022-09-12T13:13:01.4331632 Output 4985375 application/pdf E-Thesis – open access true Copyright: The author, Benjamin Heath, 2022. true eng
title Adaptive shaping of laser beams for high-harmonic generation applications
spellingShingle Adaptive shaping of laser beams for high-harmonic generation applications
BENJAMIN HEATH
title_short Adaptive shaping of laser beams for high-harmonic generation applications
title_full Adaptive shaping of laser beams for high-harmonic generation applications
title_fullStr Adaptive shaping of laser beams for high-harmonic generation applications
title_full_unstemmed Adaptive shaping of laser beams for high-harmonic generation applications
title_sort Adaptive shaping of laser beams for high-harmonic generation applications
author_id_str_mv 0fe342bb6ab0a14035d672201735c399
author_id_fullname_str_mv 0fe342bb6ab0a14035d672201735c399_***_BENJAMIN HEATH
author BENJAMIN HEATH
author2 BENJAMIN HEATH
format E-Thesis
publishDate 2022
institution Swansea University
doi_str_mv 10.23889/SUthesis.61184
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Biosciences, Geography and Physics - Physics{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Biosciences, Geography and Physics - Physics
document_store_str 1
active_str 0
description This thesis explores the use of adaptive optics to create tailored laser profiles to drive the process of high-order harmonic generation (HHG).A deformable mirror controlled by a genetic, simulated-annealing algorithm (SA), and a genetic-annealing hybrid algorithm (HA) have been used to create super-Gaussian intensity profiles of orders ranging from P = 1 to P = 2 using a low-powered He-Ne laser. Between these three algorithms it was found that there is a compromise between the algorithm performance and reliability, and the algorithm complexity.Simulated super-Gaussian beam-shaping with a phase-only SLM has been performed with a SA and HA algorithm and compared to a known π-shift method. The HA has shown an improvement in super-Gaussian quality for high orders, P ≈ 2.6.Simulations of HHG driven by super-Gaussian driver fields have been made using both the simple dipole model and the strong field approximation. It has been shown that HHG beam divergence decreases with increased order P . The fringe visibility has also been calculated as a measure of coherence.
published_date 2022-09-05T06:41:40Z
_version_ 1850740100441309184
score 11.08895

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