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Third harmonic order imaging as a focal spot diagnostic for high intensity laser-solid interactions

Dromey, B. and Bellei, C. and Carroll, D.C. and Clarke, R.J. and Green, J.S. and Kar, S. and Kneip, S. and Markey, K. and McKenna, P. (2009) Third harmonic order imaging as a focal spot diagnostic for high intensity laser-solid interactions. Laser and Particle Beams, 27 (2). pp. 243-248. ISSN 0263-0346

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Abstract

As the state of the art for high power laser systems increases from terawatt to petawatt level and beyond, a crucial parameter for routinely monitoring high intensity performance is laser spot size on a solid target during an intense interaction in the tight focus regime (< 10 mu m). Here we present a novel, simple technique for characterizing the spatial profile of such a laser focal spot by imaging the interaction region in third harmonic order (3 omega(laser)). Nearly linear intensity dependence of 3 omega(laser) generation for interactions > 10(19) Wcm(-2) is demonstrated experimentally and shown to provide the basis for an effective focus diagnostic. Importantly, this technique is also shown to allow in-situ diagnosis of focal spot quality achieved after reflection from a double plasma mirror setup for very intense high contrast interactions (> 10(20) Wcm(-2)) an important application for the field of high laser contrast interaction science.

Item type: Article
ID code: 19148
Notes: Strathprints' policy is to record up to 8 authors per publication, plus any additional authors based at the University of Strathclyde. More authors may be listed on the official publication than appear in the Strathprints' record.
Keywords: harmonic generation, intense laser interaction, Physics, Atomic and Molecular Physics, and Optics, Electrical and Electronic Engineering, Condensed Matter Physics
Subjects: Science > Physics
Department: Faculty of Science > Physics
Related URLs:
    Depositing user: Strathprints Administrator
    Date Deposited: 21 May 2010 15:09
    Last modified: 05 Sep 2014 03:33
    URI: http://strathprints.strath.ac.uk/id/eprint/19148

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