Pulsed‐laser optogalvanic spectroscopy in a high‐pressure Hg discharge

1988 ◽  
Vol 64 (4) ◽  
pp. 1758-1766 ◽  
Author(s):  
Jerry Kramer
Keyword(s):  
High Pressure ◽  
Pulsed Laser ◽  
Optogalvanic Spectroscopy

Features of metal destruction under pulse laser and beam-plasma exposure

2020 ◽  
Vol 10 ◽  
pp. 34-47
Author(s):  
V. A. Gribkov ◽  
◽  
S. V. Latyshev ◽  
V. N. Pimenov ◽  
S. A. Maslayev ◽  
...  
Keyword(s):  
High Pressure ◽  
Laser Radiation ◽  
Solid Phase ◽  
Ion Beam ◽  
Pulsed Laser ◽  
Average Energy ◽  
Destructive Effect ◽  
Pulsed Laser Radiation ◽  
Beam Plasma ◽  
Metal Materials

The features of the destructive effect of high-pressure generated under comparable conditions, namely, upon irradiation of target samples with pulsed laser radiation and beam-plasma flows created in Plasma Focus (PF) devices, on metal materials were studied. In both cases, close parameters of radiation-heat treatment were provided: power density q ~ 1010–1011 W/cm2 and pulse duration τ ~ 10 –100 ns. It have been shown that the double exposure of laser radiation to thin samples of vanadium and molybdenum with a thickness of 0.3 mm and 0.1 mm, respectively, leads to the formation of molten zones in the materials, inside which there were deep craters. The craters extended over the entire thickness of the samples, on the reverse side of which the recesses end with holes of ~ 0.1 mm for V and 0.2 mm for Mo. In a tungsten sample 0.2 mm thick, the depth of the craters in the molten zone was less than its thickness and there were microcracks on the back of the sample. Based on numerical estimates of the process under study, it was suggested that the observed effects are associated with the creation of high pressure zones of ~ 1 – 10 GPa in the irradiated targets, localized in microregions of radius r ~ 0.1 mm. In these zones, the behavior of the solid phase of the target materials, for which the tensile strength σB ≤ 1 GPa (V, Mo, W), under high pressure became close to the behavior of the liquid. The pseudo-liquid phase of the material was displaced from the center of the crater, where the pressure was maximum, to its periphery to the region of low pressure with the subsequent release of matter from the target through the irradiated surface at a speed of ~ 103 m/s. In experiments using the PF, the mechanism responsible for the formation of craters when a powerful pulsed laser radiation is applied to the target is not realized due to the different nature of the distribution of the absorbed energy density in the surface layer of the irradiated sample. The region in which the energy absorbed during the of particles implantation into the material was determined mainly by the average energy and the diameter of the ion beam (Еi ≈ 100  keV, d ~ 2 – 10 mm) and exceeds by one or two orders of magnitude the corresponding volume under laser irradiation.

scholarly journals In Situ Initial Growth Studies of SrTiO3 on SrTiO3 by Time Resolved High Pressure RHEED

1998 ◽  
Vol 526 ◽  
Author(s):  
Gertjan Koster ◽  
Guus J.H.M. Rijnders ◽  
Dave H.A. Blank ◽  
Horst Rogalla
Keyword(s):  
High Pressure ◽  
Pulsed Laser ◽  
High Energy ◽  
Initial Growth ◽  
Time Resolved ◽  
Force Microscopy ◽  
Atomic Force ◽  
Different Temperatures ◽  
Substrate Surfaces

AbstractThe initial growth of pulsed laser deposited SrTiO3 on SrTiO3 has been studied using high pressure Reflection High Energy Electron Diffraction (RHEED) and Atomic Force Microscopy (AFM). For this, we developed a Pulsed Laser Deposition (PLD)-RHEED system, with the possibility to study the growth and to monitor the growth rates, in situ, at typical PLD pressures (10-50 Pa). Using perfect single crystal SrTiO3 substrate surfaces, we observe true 2D intensity oscillations at different temperatures. Simultaneously, information on the diffusion of the deposited material on the surface could be extracted from the relaxation of the intensity after each laser pulse. The characteristic times depend on pressure and temperature as well as the 2D coverage during growth.

Pulsed laser annealing of GaAs in a high-pressure argon gas ambience

1982 ◽  
Vol 1 (3-4) ◽  
pp. 111-115 ◽  
Author(s):  
Fumio Sato ◽  
Tadasu Sunada ◽  
Jun-ichi Chikawa
Keyword(s):  
High Pressure ◽  
Laser Annealing ◽  
Pulsed Laser ◽  
Argon Gas ◽  
Pulsed Laser Annealing

scholarly journals In Situ Initial Growth Studies of (Sr, Ca)CuO2 ON SrTiO3 by High Pressure Rheed

1997 ◽  
Vol 502 ◽  
Author(s):  
Gertjan Koster ◽  
Guus J. H. M. Runders ◽  
Dave H. A. Blank ◽  
Horst Rogalla
Keyword(s):  
High Pressure ◽  
Pulsed Laser ◽  
High Energy ◽  
Initial Growth ◽  
Force Microscopy ◽  
Atomic Force ◽  
Growth Studies ◽  
Layer Structures ◽  
First Results

ABSTRACTThe initial growth of pulsed laser deposited SrCuO2 (SCO) and CaCuO2 (CCO) on SrTiO3 has been studied using high pressure Reflection High Energy Electron Diffraction (RHEED) and Atomic Force Microscopy (AFM). For this, we developed a Pulsed Laser Deposition (PLD)- RHEED system, with the possibility to study the growth and to monitor the growth rates, in situ, at typical PLD pressures (10–50 Pa). In case of depositing oxide materials, high oxygen pressures are desired. Moreover, crystallinity can be improved using higher oxygen pressures and therefore higher temperatures. With this technique we are able to obtain atomically flat films, a first step towards multi-layer structures.In this paper we present the initial growth studies of SCO and first results incorporating CCO layers in a SCO matrix.

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