Title:	Emission dynamics of an expanding ultrafast-laser produced Zn plasma under di erent ambient pressures
Authors:	Smijesh, N. Philip, Reji
Issue Date:	7-Sep-2013
Publisher:	American Institute of Physics
Citation:	Journal of Applied Physics, 2013, Vol. 114, 093301
Abstract:	We report time and space resolved spectral measurements of neutral Zn emission from an ultrafast laser produced plasma, generated by the irradiation of a Zn target with laser pulses of 100 femtoseconds duration, carried out in a broad ambient pressure range of 0.05 to 100 Torr. The measurement is done for three different axial positions in the expanding plume. The spectra are rich in neutral Zn (Zn I) emissions at 334.5 nm, 468 nm, 472 nm, 481 nm, and 636 nm, respectively, depicting the characteristic triplet structure of Zn. Fast as well as slow peaks are observed in the time of flight data of 481 nm emission, which arise from recombination and atomic contributions, respectively, occurring at different time scales. Average speeds of the fast atomic species do not change appreciably with ambient pressure. The plasma parameters (electron temperature and number density) are evaluated from the measured optical emission spectra. The rates of ionization and recombination can be enhanced by a double-pulse excitation configuration in which optical energy is coupled to the ultrafast plasma through a delayed laser pulse.
Description:	Open Access
URI:	http://hdl.handle.net/2289/5859
ISSN:	0021-8979 1089-7550(E)
Alternative Location:	http://dx.doi.org/10.1063/1.4820575
Copyright:	2007 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics.
Appears in Collections:	Research Papers (LAMP)

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