Focusing of a high-power laser beam in the course of thermal self-interaction in a moving medium

Abstract

Using an idealized model it is shown that, to minimize errors in double-spiked isotopic analyses, spike mass numbers should alternate with normal. The comprehensive error analysis which follows assumes that the individual ion currents are the independent variates for statistical purposes: errors in these are obtained by combining (i) a coefficient of variation e p due to fluctuations in ion emission with (ii) a resistor noise index eR and (iii) a shot noise index es: the noise indices are the ratios [error due to noise]/[error (i) due to emission fluctuation] for the largest ion beam in the spectrum. Methods of computing error multipliers (operating on e,,) from eR, es and the isotopic abundances, are developed. For

A Study of Beam Parameters Using NLSE in Chalcogenide Glass Through Variational Method with a Gaussian Trial Function

“…Self-focusing, an optical self-action effect, occurs when the propagating electromagnetic field induces a change in the refractive index of the non-linear medium through which the field propagates. Self-focusing and self-trapping effects of laser pulses and beam can lower the threshold of other nonlinear processes like self-phase modulation, optical damage, regulate design of high energy lasers sources required for long -distance optical communication system [1], controlled laser fusion [2,3], coherent beam combining [4]and molecular dynamic diagnostics [8,9] etc. These consequences of selfaction effects on the propagation of intense laser pulses and beams have attracted attention of researchers for more than fifty years now.…”