Nanostructured thin films on silicon and glass substrates have been obtained using high-frequency repetitively pulsed f 10–12 kHz laser radiation with wavelength λ = 1.064 μm and power density q = 33 MW/cm2 on a piezoceramic PZT-19 target at vacuum chamber pressure p = 2.2·10–2 mm Hg. The morphology of the thin piezoceramic films was studied using atomic force microscopy. Transmission spectra of the obtained films were investigated in the visible and near- and mid-IR regions. The electrophysical characteristics of PZT-19/Si structures on Si substrate were analyzed.
Nanostructured thin films on a silicon substrate were obtained by high-frequency periodic pulse f ~ 6–10 kHz action of laser radiation with wavelength λ = 1.064 μm and power density q = 120 MW/cm 2 on zirconium in a vacuum chamber at pressure p = 2.2 Pa. The morphology of the thin films of zirconium was studied by atomic-force microscopy. The transmission spectra of the zirconium films in the visible and near and mid IR regions were obtained. The electrophysical characteristics of the Zr/Si structures were analyzed.
Nanostructured thin films on a silicon substrate were obtained by the action of high-frequency repetitively pulsed f similar to 10-13 kHz laser radiation with wavelength lambda = 1.064 mu m and power density q = 57 MW/cm(2) on an La0.13Bi0.87FeO3 target at a pressure in the vacuum chamber p = 4.6 Pa. The morphology of the La0.13Bi0.87FeO3 thin films was studied using atomic force microscopy. Transmission spectra of the films in the visible and near- and mid-IR regions were obtained. The electrophysical characteristics of the La0.13Bi0.87FeO3 structures were analyzed.
Nanostructured thin films on a silicon substrate were obtained by high-frequency pulse-periodic (f 8–10 kHz) action of a laser with wavelength λ = 1.064 μm and power density q = 36 MW/cm2 on Y0.1Sr0.9CoO3–x ceramics in a vacuum chamber at pressure p = 2∙10–2 mm Hg. Their morphology was studied using atomic force microscopy. Features of their transmission spectra in the visible and near- and mid-IR regions were revealed. The electrophysical properties of the Y0.1Sr0.9CoO3–x structures were analyzed.
Nanostructured thin films on a silicon substrate were obtained by high-frequency repetitively pulsed (f ~ 10–15 kHz) laser action with a wavelength of 1.064 μm and a power density q = 54 MW/cm 2 on La 0.4 Ba 0.6 CoO 3 ceramics at a vacuum chamber pressure p = 2.2 Pa. The morphology of the obtained films was studied using atomic-force microscopy. Features of transmission spectra in the visible, near-, and mid-IR regions were revealed. The electrophysical properties of the La 0.4 Ba 0.6 CoO 3 structure were analyzed.
Processes and technological parameters of thermal spraying of gradient NiCrBSi/NiCrBSi + 20% TiC/NiCrBSi + 40% TiC coatings and their modification by compression plasma jet and laser radiation pulse processing are researched and optimized. Tribo-technical tests of the developed coatings are carried out.
By the method of high-frequency repetitively pulsed f ~ 10-15 kHz laser action with a wavelength l = 1.064 fim and a power density q = 150 MW/cm 2 on zinc oxide ceramics doped with manganese oxide at a pressure in the vacuum chamber p = 2.7 Pa there were obtained nanostructured thin films on a silicon substrate. The surface morphology and the elemental composition of the obtained films were studied using atomic force microscopy; scanning electron microscopy, and X-ray spectral microanalysis. The features of the transmission spectra in visible, near and middle IR regions are revealed. The analysis of the electrophysical properties of the ZnO+2% MnO 2 /Si heterostructure was carried out.
Nanostructured thin films on a silicon substrate were obtained on a ceramic of zinc oxide doped with manganese oxide by high-frequency periodic pulsed laser action with f ~ 10–15 kHz, wavelength λ = 1.064 μm at power density q = 150 MW/cm2 in a vacuum chamber with p = 2.7 Pa. The surface morphology and the elemental composition of the obtained films were studied using atomic force microscopy, scanning electron microscopy, and X-ray spectral microanalysis. Features of the transmission spectra in the visible, near, and middle IR regions were determined. The electrophysical properties of the ZnO + 2% MnO2/Si heterostructure were analyzed.
ZnO thin films of zinc oxide doped with 10 % ITO (indium tin oxide) on anodic aluminum oxide substrates are formed in vacuum during high-frequency repetitively pulsed laser deposition. The morphology of films on porous and non-porous surfaces of substrates was studied by atomic force microscopy. The optical properties of the films in the visible, near, and middle IR regions of the electromagnetic radiation spectrum, the Raman spectra, and also the features of the photoluminescence characteristics have been experimentally investigated. Zinc oxide films can be used in optoelectronic transducers, as luminescent material, in the form of transparent electrodes, sensitive layers of gas and biological sensors, catalysts, X-ray and gamma-radiation detectors.
ZnO thin films of zinc oxide doped with 10 % ITO (indium tin oxide) on anodic aluminum oxide substrates are formed in vacuum during high-frequency repetitively pulsed laser deposition. The morphology of films on porous and non-porous surfaces of substrates was studied by atomic force microscopy. The optical properties of the films in the visible, near, and middle IR regions of the electromagnetic radiation spectrum, the Raman spectra, and also the features of the photoluminescence characteristics have been experimentally investigated. Zinc oxide films can be used in optoelectronic transducers, as luminescent material, in the form of transparent electrodes, sensitive layers of gas and biological sensors, catalysts, X-ray and gamma-radiation detectors.
Taking into account the results of the comprehensive research, the scientific and technological outlines for deposition of composite NiCrBSi self-fluxing alloy-based thermal coatings with increased wear resistance modified with TiC carbides and processed by pulsed impacts of compression plasma jets and laser radiation have been developed. The NiCrBSi + 40%TiC thermal coatings deposited using the developed scientific and technological bases were subjected to tribotechnical tests.
Spectra and structures of near-surface plasma torches were studied experimentally by measuring the specific mass loss and plume luminosity caused by dual-pulse laser radiation at wavelengths 1064 and 532 nm on titanium in air as functions of the time between laser pulses and their sequence. Dependences of the laser-plasma temperature and concentration of charged particles on the paired laser pulse parameters were established at laser radiation power densities q1064 ≤ 3.1·109 and q532 ≤ 2.7·109 W/cm2 for λ = 1064 and 532 nm. The optimal conditions for recording erosion plasma spectra had the initial effect from second-harmonic radiation with a time interval between pulses of 4–5 μs; for specific mass loss, 3–6 μs. The results were important for enhancing the efficiency of laser emission spectral analysis and laser-plasma processing of materials.
Thin transparent conductive zinc oxide films are of interest for application in various fields of science and technology, including anti-icing systems for glasses in aircrafts, in coatings that reduce static electric charge on instrument panels, in electrical contacts to liquid crystals, electrochromic and electroluminescent indicators for displays, development of high-efficiency solar cells. Thin zinc oxide films on anodic aluminium oxide substrates are formed on the porous side and on the barrier layer of γ -aluminium oxide under high-frequency pulsed-periodic laser deposition in vacuum. The morphology of the obtained films was studied by atomic-force microscopy and their differences were noted, depending on the side of the substrate. The optical properties of films in the near-IR region, as well as the features of their photoluminescence characteristics were studied experimentally. The substrates Al 2 O 3 –ZnO film as a sensitive layer can be used to design sensors and tandem solar cells.
A prototype of a 2D detector based on specially designed straw tubes with cathode data readout has been developed and tested. This detector exhibits comparable accuracies in measuring radial and longitudinal coordinates. Its rate capability is similar to the capabilities of traditional detectors whose tubes are smaller by half in diameter.
We have experimentally studied the spectra and structure of a near-surface plasma and measured the recoil impulses when brass and graphite targets are exposed in air to dual laser pulses at the wavelengths 0.532 μm and 1.065 μm, as a function of the time interval between the laser pulses and the pulse sequence. We have established the dependences of the temperature of the laser plasma and the concentration of charged particles and also the recoil impulse on the parameters of the dual laser pulses for laser power density 4·109 W/cm2. We show that the optimal conditions for recording the spectra of the ablation plasma occur when the second-harmonic radiation arrives first with time interval between laser pulses of 1.5–6 μs, and the optimal conditions for generating the recoil impulse involve an interval of 1.5–2 μs, which is important for improving the performance of emission laser spectral analysis and laser plasma micromotors for aerospace applications.
Double-pulse nanosecond bichromatic laser irradiation of carbon and brass targets is implemented. The dependence of temperature and density of electrons, as well as the specific recoil momentum of an outflowing plasma jet, on the ordering of laser pulses and the interpulse time delay is found. The results obtained can be used for the development of laser- plasma spacecraft microengines and the enhancement of laser spectral analysis' sensitivity.