Enhanced - emission from “smoked”  targets irradiated with , laser pulses

F. Y. Khattak; R. J. Clarke; E. J. Divall; M. Edwards; P. S. Foster; C. J. Hooker; A. J. Langley; P. Mistry; D. Neely; J. Smith; C. Spindloe; G. Tallents; M. Tolley; D. Riley

doi:10.1209/epl/i2005-10237-5

All issues

Volume 72 / No 2 (October 2005)

Europhys. Lett., 72 2 (2005) 242-248

Abstract

Issue		Europhys. Lett. Volume 72, Number 2, October 2005


Page(s)		242 - 248
Section		Physics of gases, plasmas and electric discharges
DOI		https://doi.org/10.1209/epl/i2005-10237-5
Published online		21 September 2005

Europhys. Lett., 72 (2), pp. 242-248 (2005)

Enhanced $\chem{He}$ - $\mth{\alpha}$ emission from “smoked” $\chem{Ti}$ targets irradiated with $\mth{400}$ $\un{nm}$ , $\mth{45}$ $\un{fs}$ laser pulses

F. Y. Khattak¹, R. J. Clarke², E. J. Divall², M. Edwards³, P. S. Foster², C. J. Hooker², A. J. Langley², P. Mistry³, D. Neely², O. A. M. B. Percie du Sert¹, J. Smith², C. Spindloe², G. Tallents³, M. Tolley² and D. Riley¹

¹ School of Mathematics and Physics, Queen's University of Belfast University Road, Belfast, BT7 1NN, UK
² Central Laser Facility, CLRC Rutherford Appleton Laboratory Chilton, Didcot, Oxon, OX11 0QX, UK
³ Department of Physics, University of York - Heslington, York YO10 5DD, UK

Corresponding author: F.Khattak@qub.ac.uk

Received: 1 July 2005
Accepted: 31 August 2005

Abstract

We present a study of $\chem{He}$ -like 1s²-1s2p line emission from solid and low-density $\chem{Ti}$ targets under $\simeq 45\un{fs}$ laser pulse irradiation with a frequency doubled $\chem{Ti}$ :Sapphire laser. By varying the beam spot, the intensity on target was varied from $10^{15}\un{W/cm^2}$ to $10^{19}\un{W/cm^2}$ . At best focus, low density “smoked” $\chem{Ti}$ targets yield $\sim 20$ times more $\chem{He}$ -α than the foil targets when irradiated at an angle of $45^\circ$ with s-polarized pulses. The duration of $\chem{He}$ -α emission from smoked targets, measured with a fast streak camera, was similar to that from $\chem{Ti}$ foils.

PACS: 52.38.Ph – X-ray, γ-ray and particle generation / 52.25.Os – Emission, absorption, and scattering of electromagnetic radiation

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