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Cummins, T. (Thomas)
Preferred name
Cummins, T. (Thomas)
Official Name
Cummins, T. (Thomas)
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Now showing 1 - 2 of 2
- PublicationThe effect of viewing angle on the spectral behavior of a Gd plasma source near 6.7 nm(American Institute of Physics, 2012)
; ; ; ; ; ; ; ; ; ; We have demonstrated the effect of viewing angle on the extreme ultraviolet (EUV) emission spectra of gadolinium (Gd) near 6.7 nm. The spectra are shown to have a strong dependence on viewing angle when produced with a laser pulse duration of 10 ns, which may be attributed to absorption by low ion stages of Gd and an angular variation in the ion distribution. Absorption effects are less pronounced at a 150-ps pulse duration due to reduced opacity resulting from plasma expansion. Thus for evaluating source intensity it is necessary to allow for variation with both viewing angle and target orientation.Scopus© Citations 18 568 - PublicationOptimizing conversion efficiency and reducing ion energy in a laser-produced Gd plasma(American Institute of Physics, 2012)
; ; ; ; ; ; ; ; ; ; We have demonstrated an efficient extreme ultraviolet (EUV) source at 6.7 nm by irradiating Gd targets with 0.8 and 1.06 μm laser pulses of 140 fs to 10 ns duration. Maximum conversion efficiency of 0.4% was observed within a 0.6% bandwidth. A Faraday cup observed ion yield and time of flight signals for ions from plasmas generated by each laser. Ion kinetic energy was lower for shorter pulse durations, which yielded higher electron temperatures required for efficient EUV emission, due to higher laser intensity. Picosecond laser pulses were found to be the best suited to 6.7 nm EUV source generation.Scopus© Citations 47 718