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Automation of single-shot carrier-envelope phase measurement
Umeå University, Faculty of Science and Technology, Department of Physics.
2018 (English)Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
Abstract [en]

Pulsed lasers have become widely used working devices in the last decades. Continues development lead to shorter and shorter pulses and consequently higher and higher peak powers. Especially with mode-locked Ti:Sapphire-lasers it is possible to obtain pulses that contain just a few optical cycles of the carrier frequency. The achievable intensities allowed the observation and examination of various nonlinear optical effects.

For long pulses usually just the carrier frequency and the temporal shape of the intensity envelope (mainly the pulse duration) are important parameters for describing light-matter-interaction. But the shorter a pulse is the more relevant is the relative phase between the carrier wave and the envelope, the so-called carrier-envelope phase (CEP). The interpretation of nonlinear effects like high-harmonic generation (HHG) or electron acceleration from solids often requires knowledge of the temporal behavior of the electric field (and not just the intensity) in a pulse. That is why in such experiments usually either a CEP-stabilized laser-system is used or the CEP is simultaneously measured and compared to the other results in the evaluation (CEP-tagging).

One possibility to get single-shot measurements of the CEP is an f-to-2f interferometric setup, that records the interference between an octave spanning fundamental spectrum and its second harmonic with a spectrometer. In the spectrogram CEP-depended fringes can be observed in the region where fundamental and second harmonic are spectrally overlapping. To achieve the necessary spectral bandwidth white-light generation is used to broaden the spectrum. The advantage of the f-to-2f setup is that it can be used to measure the CEP at various positions in the laser system as it can handle quite different pulse energies and durations. It should be noted that an f-to-2f system is not able to determine the absolute value of the CEP, but just the CEP difference to a reference pulse.

For this thesis a program was developed and tested that automates the acquisition and real-time evaluation of the spectrograms. It will be used to determine the CEP changes in different parts of the LWS-20 laser system, particularly for assessing the quality of CEP-stabilization.

Place, publisher, year, edition, pages
2018.
National Category
Atom and Molecular Physics and Optics
Identifiers
URN: urn:nbn:se:umu:diva-150037OAI: oai:DiVA.org:umu-150037DiVA, id: diva2:1230670
Subject / course
Fysik D - examensarbete II
Available from: 2018-07-04 Created: 2018-07-04 Last updated: 2018-07-04Bibliographically approved

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CiteExportLink to record
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