Vacuum-UV photoabsorption imaging of laser-ablated plumes

John S. Hirsch; Piergiorgio Nicolosi; Luca Poletto; Eugene T. Kennedy; Jean-Paul Mosnier; Amit Neogi; John T. Costello

doi:10.1117/12.464357

27 August 2003 Vacuum-UV photoabsorption imaging of laser-ablated plumes

John S. Hirsch, Piergiorgio Nicolosi, Luca Poletto, Eugene T. Kennedy, Jean-Paul Mosnier, Amit Neogi, John T. Costello

Proceedings Volume 4876, Opto-Ireland 2002: Optics and Photonics Technologies and Applications; (2003) https://doi.org/10.1117/12.464357
Event: OPTO Ireland, 2002, Galway, Ireland

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.

Citation Download Citation

John S. Hirsch, Piergiorgio Nicolosi, Luca Poletto, Eugene T. Kennedy, Jean-Paul Mosnier, Amit Neogi, and John T. Costello "Vacuum-UV photoabsorption imaging of laser-ablated plumes", Proc. SPIE 4876, Opto-Ireland 2002: Optics and Photonics Technologies and Applications, (27 August 2003); https://doi.org/10.1117/12.464357

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