Laser stimulated growth

Laser stimulated growth of metal thin films is one of the important methods of surface processing. However, only a little is )cnown about the fundamental physicochemical mechanisms pertinent to these techniques (1,19,21,22). 

H.omzthium. This ion has no stable isotopes. The isotope Pml47 is a beta emitter (0.22 MeV) with a half-life of 2.6 years. This radioactivity poses problems for the growth, fabrication, operation, and lifetime of a solid-state laser. Stimulated emission has not been reported for any host. 

Delbriick et al., (1976) have recently sought to determine whether or not the stimulation of Phycomyces involves the excitation of the lowest triplet state of riboflavin. They determined an action spectrum of light-growth response between 575 and 630 nm using a tunable laser beam and taking advantage of the null method described above. This action spectrum was compared with an action spectrum obtained by computer extrapolation of a phototropic action spectrum covering 445—560 nm. 

A study of formation and modification of Ge quantum dots (QD) in Si is the actual problem due to perspectives to apply Ge/Si nanostructures in optoelectronic devices [1], To obtain nanoclusters with specified properties it is important to control sizes and density of Ge QDs. The modification of Ge nanocluster sizes is reached [2,3] by variation of temperature and growth rate, change of interfacial mechanical stresses, creation of buffer layers, insertion of impurities as nucleation centres, and stimulation of island growth by ion beams. In this paper, modification of Ge QDs by pulsed laser radiation was studied by Raman spectroscopy. 

There are several comprehensive reviews [4] of theories of stimulated Raman processes and of salient experiments. For our purpose, we need only consider that when intense laser radiation (at frequency coo) is incident on a Raman-active medium, there is exponential growth of the spontaneous Stokes wave (at frequency 0)3) given by... 

Development of high-power switches was stimulated by the growth of the electric power distribution networks. Control and protection of these networks involved power handling capabilities in excess of 10 W. Lasers, X-ray equipment, particle accelerators, fusion research, and so forth, have required the switching of power in the form of fast rising pulses and at levels that can exceed 10 W. 

Introduction 197 Physical Principles 198 Animal Experiments 198 Effect of LITT Ablation on Immunity Stimulation 198 Effect of LITT Ablation on Tumor Growth 199 Pre-interventional Protocol 199 Patient Selection 199 Pre-treatment Assessment 200 Equipment and Procedure 200 Laser Applicators 200 Puncture 200... 

This grating will mediate stimulated scattering between the ordinary and extraordinary wave components. In analogy to stimulated Brillouin scattering, the growth of the scattered wave component is dependent on the intensity of the incident laser, and... 

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