Investigating the effects of laser intensity and pulse duration on 6.7-nm BEUV emission from Gadolinium plasma

Thomas Cummins; Takamitsu Otsuka; Noboru Yugami; Weihua Jiang; Akira Endo; Bowen Li; Colm O'Gorman; Padraig Dunne; Emma Sokell; Gerry O'Sullivan; Takeshi Higashiguchi

doi:10.1117/12.2015164

11 December 2012 Investigating the effects of laser intensity and pulse duration on 6.7-nm BEUV emission from Gadolinium plasma

Thomas Cummins, Takamitsu Otsuka, Noboru Yugami, Weihua Jiang, Akira Endo, Bowen Li, Colm O'Gorman, Padraig Dunne, Emma Sokell, Gerry O'Sullivan, Takeshi Higashiguchi

Author Affiliations +

Proceedings Volume 8678, Short-Wavelength Imaging and Spectroscopy Sources; 86780C (2012) https://doi.org/10.1117/12.2015164
Event: Short-Wavelength Imaging and Spectroscopy, 2012, Bern, Switzerland

Abstract

In this work we present results on the influence of laser pulse duration and irradiating power density on the conversion efficiency (CE) and the ion energy of gadolinium (Gd) laser produced plasmas. Three lasers were used with 10 ns, 150 ps and 140 fs pulse durations. By varying the lasers output energies, experiments could be carried out for a power density range of 10¹¹ - 10¹⁵ W/cm². A maximum CE of 0.4% was achieved within a 0.6% bandwidth in 2π steradians using the picosecond laser. A faraday cup was used to calculate ion yield and time of flight measurements of each laser. The picosecond laser also showed a reduction in the ion time of flight measurements compared with the nanosecond pulse.

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Thomas Cummins, Takamitsu Otsuka, Noboru Yugami, Weihua Jiang, Akira Endo, Bowen Li, Colm O'Gorman, Padraig Dunne, Emma Sokell, Gerry O'Sullivan, and Takeshi Higashiguchi "Investigating the effects of laser intensity and pulse duration on 6.7-nm BEUV emission from Gadolinium plasma", Proc. SPIE 8678, Short-Wavelength Imaging and Spectroscopy Sources, 86780C (11 December 2012); https://doi.org/10.1117/12.2015164

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