Activation of film growth on indium phosphide by pulsed photon treatment

Photon activation of various physicochemical processes by the radiation of powerful pulsed xenon lamps (radiation range of 0.2-1.2 µm) is one of the promising areas of material science. The aim of this study was to determine the effect of preoxidative pulsed photon treatment on the process of thermal oxidation of indium phosphide with a nanosized layer of V2O5 on the surface, as well as its effect on the composition and morphology of the formed films. We determined the optimal mode of pre-oxidative pulsed photon treatment of magnetron-formed V2O5/InP heterostructures with a radiation density of 15 J/cm2. By laser and spectral ellipsometry methods, photon activation of V2O5/InP before thermal oxidation was found to increase the thickness of the formed films practically twofold. X-ray diffraction analysis confirms the intensification of the phosphate formation process. The morphological characteristics of the films were determined by atomic force microscopy.Pre-oxidative pulsed photon treatment with an optimal radiation density of 15 J/cm2 activates the thermal oxidation of V2O5/InP heterostructures. It is associated with the formation of new active centres and accelerated rearrangement of chemical bonds in the intermediate complexes of the V2O5 catalyst with semiconductor components

Spatial distribution of radiation from pulsed xenon gas-discharge lamps with different configurations of the plasma channe

The paper presents the results of studies of the spatial distribution of radiation from pulsed xenon lamps with a straight and U-shaped plasma channel configuration in the ultraviolet and near infrared spectral range. The dependence of the shape of the indicatrix on the design fea-tures of the flash lamp,the absorption coefficients of the plasma and the envelope limiting the discharge is shown.

Distinctions of the Design of UHP Xenon Lamps with Sapphire Envelope

This article describes the major development results of the first Russian sample of a UHP xenon discharge lamp with sapphire envelope. The article proposes a method of monitoring of thermal fields of semi-transparent materials and studies the thermal distribution of quartz and sapphire envelopes of UHP discharge lamps. Mechanical strength of sapphire tubes depending on the temperature is studied, the thickness of the discharge envelope wall is calculated, and distinctions of the design of a UHP xenon lamp with the sapphire envelope are considered.

The effect of a rapid photon treatment of the foil of the PdCu solid solution of composition close to the equiatomic

transformations in a thin ~4 m foil of PdCu solid solution were investigated by x-ray diffractometry and measurement of electrical resistance in heating-cooling cycles during thermal or rapid photon treatment by radiation of high-power pulsed xenon lamps. It has been found that a single rapid photon treatment for 0,3 s (the energy dose of the radiation entering the sample is 10 j cm‑2) leads to a complete disordering of the solid solution at a rate 400 times greater than in the heat treatment mode used (heating at a rate of 15 K min‑1).

POWER MODEL OF IMPULSE ARC DISCHARGE GENERATION IN ACTIVE MEDIA OPTICAL PUMPING XENON LAMPS OF SOLID-STATE LASERS

The semi-empirical model of arc impulse discharge development in impulse xenon lamps for optical pumping of solid-state lasers' active media was considered. Equations of the power balance of supplied electrical power and processes of ionization, plasma heating, heat dissipation and optical radiation generation laid the model's basis. The analytical description of the processes being considered results in an ordinary differential equation which allows a non-resource-intensive numerical solution. The built model enables to evaluate basic electrical and optical parameters of non-local arc discharge plasma at its development stage. Comparison with the results of measurements of electrical and optical plasma parameters which are the most convenient for experimental diagnostics in the modelled non-stationary mode testifies to adequacy of the developed model. Relative simplicity and convenience of the model predetermines its possible usage when solving applied engineering tasks of optimization of operating parameters of impulse pumping lamps and for obtaining initial (zero) approximations for comprehensive modelling of a non-local non-stationary gas discharge plasma in science-intensive calculations taking into account a great combination of elementary collision and radiation processes in a non-equilibrium system.