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The use of a variety of diagnostics can offer significant insight into the mechanisms of laser ablation and film growth. It seems clear that under conditions of optimum film growth that significant collisional processes occur both within the laser-desorbed plume, and between the plume and the processing gas. These collisional processes are responsible for the macroscopic characteristics of the plume,...
Pulsed laser deposition has become an ubiquitous technique for the stoichiometric deposition of thin films of complex, multielemental compounds. In addition, the system enables rather simple embodiments for the fabrication of sophisticated materials structures such as superlattices of different materials. In this talk the various issues relating to this deposition process would be illustrated for...
Laser ablation for in situ film growth of 1:2:3 superconductors requires high laser energy densities and results in a dense, multicomponent laser plasma which expands into high background pressures (-200 mTorr) of oxygen. The physics of the transport process in the film growth regime involves a variety of high-density collisional phenomena which one attempts to avoid in nearthreshold ablation studies:...
Silicon oxide films are deposited by laser ablation from silicon, silicon monoxide and silicon dioxide (quartz) targets, performed under vacuum and in oxygen atmosphere, with a high power pulsed ArF (λ = 193 nm) excimer laser. The specific influence of oxygen in the chamber during the laser processing on the synthesis of stoichiometric SiO2 films is demonstrated.
Inductively coupled plasma-atomic emission spectroscopy was used for the study of the explosive removal of solid material by high power pulsed laser radiation. The effect of sample transport characteristics, laser power density, and the pressure pulse generated by the expansion of laser plasma are discussed.
Surface Analysis by Resonant Ionization of Sputtered Atoms (SARISA) has demonstrated the ability to detect trace elements at concentrations below 100 ppt. Use of energetic primary ions to desorb surface species is uniquely suited for elemental surface analysis because the ratio between the number of incident energetic ions and the number of ejected surface atoms is easily quantifiable (Sputter Yield)...
KrF excimer laser irradiation (248 nm) of CdTe (100) at fluences below the melting threshold removes surface atoms and produces reversible changes in composition and structure that depend on the laser fluence and number of laser pulses. At fluences below 65 mJ/cm2, the products desorbed from the surface consist of neutral Cd atoms and Te2 molecules, and the velocity distributions of the desorbed products...
The use of pulsed infrared lasers for tissue ablation has led to increased control over thermal damage to tissue and to more precise control over material removal. Tissue removal is mediated by the explosive vaporization of water, which can lead to clinically significant tissue effects.
The photokinetic etching effect which is seen in the interaction of a moving spot of cw ultraviolet laser radiation with the surface of an organic solid offers a new modality for the use of UV laser photons. It may develop into a practical method to cut a variety of polymer films to a precision of a few tens of microns with no detectable lateral thermal damage. Its potential use as a technology will...
The gas-dynamic effects which are so prominent in laser-pulse sputtering have three limiting cases. The one limit could be described as an unsteady adiabatic expansion (UAE) due to gas which escapes from a finite reservoir (“outflow” model). The second limit is that the particles are released from target surface, form a Knudsen layer (KI,), and then enter a UAE (“KL-UAE” model). Closely related is...
Some results are presented concerning investigations in laser desorption of neutral organic molecules by various laser wavelength into a supersonic jet followed by either single or multiphoton ionization. The results demonstrate that resonant absorption of photons in the desorbing materials must take place in order to observe high quality mass spectra. Non resonant laser desorption requires significantly...
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