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Proceedings Paper

Vacuum-UV photoabsorption imaging of laser-ablated plumes
Author(s): John S. Hirsch; Piergiorgio Nicolosi; Luca Poletto; Eugene T. Kennedy; Jean-Paul Mosnier; Amit Neogi; John T. Costello
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Paper Abstract

We describe a new system based on a 1m normal incidence vacuum monochromator with corrected optics that produces a wavelength tunable and collimated vacuum-UV beam. The VUV source is a laser-generated plasma high-Z metal. The primary functin of the system is the measuremtn of time resolved 'images' or spatial distributions of photo-absorption/photoionization in expanding laser plasma plumes. This is achieved by passing the beam through the sample of interest and recording the 'footprint' of the attenuated beam on a CCD. Using the 'photoabsorption imaging' technique we track and extrat column density distriubtions in the expanding plasma plumes. We can also mesaure the plume front velocity. We have characterized the system, particulary in relation to spectral and spatial resolution and the experimental results meet very well expectations from the ray tracing done at the design phase. We present first photoabsorption images of laser produced Ca polumes from the system.

Paper Details

Date Published: 27 August 2003
PDF: 10 pages
Proc. SPIE 4876, Opto-Ireland 2002: Optics and Photonics Technologies and Applications, (27 August 2003); doi: 10.1117/12.464357
Show Author Affiliations
John S. Hirsch, Dublin City Univ. (Ireland)
Piergiorgio Nicolosi, Univ. degli Studi di Padova (Italy)
INFM (Italy)
Luca Poletto, Univ. degli Studi di Padova (Italy)
INFM (Italy)
Eugene T. Kennedy, Dublin City Univ. (Ireland)
Jean-Paul Mosnier, Dublin City Univ. (Ireland)
Amit Neogi, Dublin City Univ. (Ireland)
John T. Costello, Dublin City Univ. (Ireland)

Published in SPIE Proceedings Vol. 4876:
Opto-Ireland 2002: Optics and Photonics Technologies and Applications
Vincent Toal; Norman Douglas McMillan; Gerard M. O'Connor; Eon O'Mongain; Austin F. Duke; John F. Donegan; James A. McLaughlin; Brian D. MacCraith; Werner J. Blau, Editor(s)

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