Abstract
Fast imaging and sensitive spectroscopic investigations of laser ablation plume propagation reveal fundamental collisional phenomena relevant to film growth by pulsed laser deposition and optimized cluster growth via laser vaporization. Two phenomena are detailed. The first involves the splitting of the ablation plume into distinct high- and low-energy components as a weak shock front froms during ablation into a low-density background gas. The second involves the dynamics of graphite ablation for vacuum deposition of tetrahedrally coordinated amorphous diamond films. In this paper spatially and temporally resolved (approx.0.1 mm, approx.5 ns) plasma diagnostic techniques of optical emission spectroscopy, optical absorption spectroscopy, fast Langmuir probe analysis, and gated-ICCD fast photography are combined to provide a more complete picture of the laster ablation plume initiation and propagation. Spectroscopic imaging was performed using a tunable liquid crystal filter with 5-nm bandwidth across a 400-720-nm wavelength range. Gated photon counting spectroscopy was employed to explore extremely weak plasma luminescence following the propagation of the initial ablation plume in vacuum and during the 'rebound' of the plume with a substrate during pulsed laser deposition of amorphous diamond.
| Original language | English |
|---|---|
| Pages (from-to) | 252-253 |
| Number of pages | 2 |
| Journal | Conference Proceedings - Lasers and Electro-Optics Society Annual Meeting-LEOS |
| State | Published - 1996 |
| Event | Proceedings of the 1996 Conference on Lasers and Electro-Optics, CLEO'96 - Anaheim, CA, USA Duration: Jun 2 1996 → Jun 7 1996 |