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Vacuum-ultraviolet photoabsorption imaging system for laser plasma plume diagnostics

Hirsch, John S. and Kennedy, Eugene T. and Neogi, A. and Costello, John T. and Nicolosi, P. and Poletto, L. (2003) Vacuum-ultraviolet photoabsorption imaging system for laser plasma plume diagnostics. Review of Scientific Instruments, 74 (6). pp. 2992-2998. ISSN 0034-6748

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We describe a recently designed and constructed system based on a 1 m normal incidence vacuum monochromator with corrected (toroidal) optics that produces a wavelength tuneable and collimated vacuum-ultraviolet (VUV) (λ=30–100 nm) beam. The VUV continuum source is a laser-generated gold plasma. The primary function of the system is the measurement of time resolved “images” or spatial distributions of photoabsorption/photoionization in expanding laser plasma plumes. This is achieved by passing the beam through the sample of interest (in our case a second synchronised plasma) and recording the “footprint” of the attenuated beam on a charge coupled device. Using this VUV photoabsorption imaging or “shadowgraphy” technique we track and extract column density distributions in expanding plasma plumes. We can also measure the plume front velocity. We have characterized the system, particularly in relation to spectral and spatial resolution and the experimental results meet very well the expectations from ray tracing done at the design phase. We present first photoabsorption images and column density distributions of laser produced Ca plumes from the system.

Item Type:Article (Published)
Uncontrolled Keywords:plasma diagnostics; ultraviolet spectra; time resolved spectra; photoionisation; plasma production by laser;
Subjects:Physical Sciences > Physics
DCU Faculties and Centres:Research Initiatives and Centres > National Centre for Plasma Science and Technology (NCPST)
DCU Faculties and Schools > Faculty of Science and Health > School of Physical Sciences
Publisher:American Institute of Physics
Official URL:
Copyright Information:© 2003 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. The following article appeared in Review of Scientific Instruments and may be found at .
Funders:Higher Education Authority, Enterprise Ireland
ID Code:15632
Deposited On:06 Aug 2010 13:36 by DORAS Administrator. Last Modified 06 Aug 2010 13:36

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