Influence Of Pulsed Laser Radiation Research Articles

Explosive Decomposition of High Explosives with Ultrafine Metal Particle Inclusions under the Influence of Pulse Laser Radiation

Explosive Decomposition of High Explosives with Ultrafine Metal Particle Inclusions under the Influence of Pulse Laser Radiation

Influence of laser radiation on optical transparent dielectrics

This paper deals with the main characteristics of the influence of pulsed laser radiation and its application for the labeling of transparent dielectrics. On the basis of the analysis of the literature data and the study of the possibilities of using laser radiation for marking different materials, it is proposed to investigate the effect of the radiation wavelength on the size of the received defect inside the material. Experimentally shown that the pulse laser processing of samples with laser irradiation energy below 3.4 mJ/cm2 visual tags in the sample are not formed. Thus, you can control the geometric dimensions of the mark.

Changes in the Morphology, Structure, and Microhardness of Zirconium Alloy Samples as a Result of Exposure to Laser Pulses

The results of experimental studies on the modification of the surface layer of grade E-110 zirconium alloy under the influence of pulsed laser radiation are presented. It was established that, as a result of laser treatment, the morphology of the surface layer changes with the formation of nanoparticles up to 50 nm in size. The relief of the treated surface becomes structurally heterogeneous, containing phases of zirconium and monoclinic dioxide ZrO2. It was revealed that, as a result of the action of laser pulses, a significant increase in the microhardness of the surface of zirconium samples occurs to 27.1 ± 0.1 GPa.

Formation of powder materials under the combined influence of pulse laser radiation and electric arc discharge

In this paper presents an assessment of the efficiency of the synthesis of nanoscale spherical powder materials by the combined action of ultrashort laser pulses and electric arc discharge. Experimentally determined optimal from the point of view of technological effectiveness and efficiency, the conditions conducive to the spread of eclectic arc discharge by laser-induced plasma channel. The scheme of experimental work, the results achieved.

Влияние импульсного лазерного излучения на состав поверхностных слоёв титанового сплава ВТ6

Влияние импульсного лазерного излучения на состав поверхностных слоёв титанового сплава ВТ6

Investigation of crater form and dimensions evolution during laser treating of materials

Acoustic emission of a zone of the destruction formed during influence of pulse laser radiation on a surface of metal is considered. Dependence of the time form of acoustic fluctuations on parameters of an irradiated material and the law of increase in depth of a crater was estimated. It is revealed, that at action on a surface of the copper sample of a laser impulse duration ∼ 20 µs time of growth of a zone of destruction makes approximately 40 µs. It is shown also that having detected a diffraction picture appearing on incidence of SHF-radiation on the surface of solid and having achieved during the experiment the best coincidence of the experimental and calculated using the computer model data one can define the character of the zone of destruction on the surface of structure being under treatment relief.

Modification of the structure and properties of Ni3B-based thick films by the action of laser radiation

The results of studying the influence of pulse laser radiation on the surface morphology and certain electrophysical properties of Ni3B-based thick films produced by screen printing of composite pastes onto a dielectric substrate are presented in this work. The action of nanosecond pulses promotes the size reduction of the conducting phase particles, whereas, under microsecond pulses, the distribution of the conducting phase remains the same on the whole surface. The irradiation with millisecond pulses at energies of E = 0.4–0.6 J results in the surface flowing. The current-voltage characteristics and the dependence of the electrical resistivity on the temperature are presented. Laser processing of the samples in the nano- and microsecond ranges is established to promote the work of resistors, according to the standard and technical conditions, when the I-U linear dependence is realized.

Explosive decomposition of PETN with nanoaluminum additives under the influence of pulsed laser radiation at different wavelengths

The results of measurements of the threshold of explosive decomposition of PETN with 0.1 wt % additives of aluminum nanoparticles under the action of the first and second harmonics of a YAG:Nd3+ laser with a pulse duration of 12 ns are presented. A comparison of experimental and theoretical results is performed. It is concluded that the absorption of radiation heats the nanoparticles to form chemical decomposition kernels in the vicinity of the hotspot, so that the initiation of explosive decomposition is not associated with optical breakdown of the sample.

Influence of pulsed laser radiation on the morphology and photoelectric properties of InSb crystals

Modifications in the surface morphology and photoelectric properties of InSb crystals irradiated with nanosecond pulses of ruby laser are studied. The threshold energy density corresponding to the onset of surface melting was determined to be 0.14 J/cm2. Laser-induced changes in the spectra and photoconduction kinetics are analyzed. It is demonstrated that the irradiation of InSb crystals with ruby laser pulses within a certain range of energy densities slows down the surface recombination, increases the nonequilibrium carrier lifetime, and, as a consequence, enhances the photosensitivity of crystals.

Influence of pulsed laser radiation on the real structure of CdTe single crystals

Back-reflection x-ray diffraction topography is used the measure the real structure of the surface layer of CdTe single crystals. It is found that the structural changes depend mainly on the laser power, on the presence of a doping impurity, and on the orientation and profile of the sample surface. Three distinct and conspicuous phenomena are discussed: overall improvement of the real structure of the surface layer, the periodic relief of the crystal surface, and twin mosaic structure.

On the synthesis of FeC compounds under the influence of laser radiation

This paper describes investigations on the synthesis of a layer from an iron and carbon powder mixture under the influence of pulsed laser radiation. It was observed that regions with different carbon concentrations are formed in the alloy. In the regions of high carbon concentration a carbide phase of the Fe 1− x C x type is formed, where x varies from 0.265 to 0.285. The carbon concentration in the carbide phase depends insignificantly on the concentration of the initial mixture and on the laser irradiation exposure time. In the regions of lower carbon concentration a ferrite is formed, the carbon concentration of which does not exceed 0.2 at.%. Investigations showed that γ-Fe and carbide phases are formed both in the hyperfine form (crystal size, about 30 nm) and in larger (ferromagnetic) forms of the crystals.

On the synthesis of FeB system thin films from powder mixtures under the influence of laser radiation

This paper describes an investigation of the synthesis of films from iron and boron powder mixtute under the influence of pulse laser radiation. The investigation of the composition of phases by Mossbauer spectroscopy showed that a heterogenic structure is formed with the distribution of phase concentration being dependent on the composition of mixture. The maximum yields of the FeB, Fe 2B, Fe 3B and FeB n formed phases are moved over 1.5 times with respect to the stoichiometric mixture composition of the atoms. It was defined that through synthesis under the influence of pulse laser radiation, the maximum yield of the synthesized phase is dependent on the solid state features of the pure synthesized materials.