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Showing papers on "Pulsed laser deposition published in 1971"


Journal ArticleDOI
TL;DR: In this paper, material removal from the front surface of a solid by a high-intensity laser beam is analytically treated, and it is found that for certain laser and material parameters subsurface temperatures will exceed the surface temperature.
Abstract: Material removal from the front surface of a solid by a high-intensity laser beam is analytically treated. The model used allows for transmission of laser energy past the front surface and for transient phenomena. It is found that for certain laser and material parameters subsurface temperatures will exceed the surface temperature. Under such conditions, explosive removal of material could occur resulting in very rapid and efficient material removal. These predictions are compared to previously published experimental results.

223 citations



Journal ArticleDOI
TL;DR: In this paper, a collisional mechanism was invoked to explain the anomalously long infrared laser pulses in cesium-helium vapor when helium buffer gas is present, and self-focusing of a ruby laser beam was also observed to occur in Cesium under certain conditions.
Abstract: Infrared laser action is observed to occur in vapors of K, Rb, and Cs photoexcited by various giant pulse laser beams. The mechanism of excitation involves two‐photon absorption by the molecular species followed by dissociation into various excited atomic states. In the case of cesium, anomalously long infrared laser pulses are obtained when helium buffer gas is present. A collisional mechanism is invoked to explain this phenomenon. Self‐focusing of a ruby laser beam is also observed to occur in cesium–helium vapor under certain conditions.

44 citations


Journal ArticleDOI
TL;DR: In this article, the authors measured the energy output of a pulsed chemical laser as a function of pressure and mixing ratio for various mixtures of IF 7 and H 2, and found that the laser energy output peaks at approximately 100 torr for a wide range of mixing ratios.

19 citations


Journal ArticleDOI
TL;DR: A tunable near UV laser with high spectral brightness has been constructed in this article, where a ruby giant pulse laser pumps a polymethene dye and produces IR emission with two tilted Fabry-Perot interferometers and a resonant reflector.

17 citations


Journal ArticleDOI
TL;DR: In this article, a model for substrate surface coverage as a function of time during growth is proposed, and it is shown that when a metal film is deposited on substrates of high emissivity, a plot of film temperature vs time displays a maximum which can be related to deposition rate.
Abstract: A theory has been developed to determine the temperature of a thin film during its growth by physical vapor deposition in vacuo from a resistance‐heated source. Three sources of heat which contribute to the film temperature are radiation losses from the source, kinetic equilibration of the condensing vapor stream, and condensation of the evaporant. By assuming planar substrate geometry, the heat equation was solved for the case in which the bottom of the substrate was held at constant temperature and the top surface was subjected to the heat flux described above. Solutions of the heat equation were obtained with the aid of an analog computer constructed during the course of the investigation. By proposing a model for substrate surface coverage as a function of time during growth, it is shown that when a metal film is deposited on substrates of high emissivity, a plot of film temperature vs time displays a maximum which can be related to deposition rate.

8 citations


Patent
12 Aug 1971
TL;DR: In this article, an inert gas leak adjacent the substrate is utilized to randomize the coating vapor cloud and cause non line-of-sight deposition of superalloys, particularly the nickel-base and cobalt-base super-alloys.
Abstract: In the processes for forming protective coatings on metal substrates, particularly the nickel-base and cobalt-base superalloys, by deposition in vacuum, an inert gas leak adjacent the substrate is utilized to randomize the coating vapor cloud and cause non line-of-sight deposition.

7 citations


Journal ArticleDOI
TL;DR: A modular thin film deposition system has been designed in which several arrangements of source, substrate, and associated deposition facilities are possible as discussed by the authors, which is compatible for use with different pumping arrangements and has been used in this laboratory in conjunction with various thin film studies.
Abstract: A modular thin film deposition system has been designed in which several arrangements of source, substrate, and associated deposition facilities are possible. The system is compatible for use with different pumping arrangements and has been used in this laboratory in conjunction with various thin film studies.

3 citations



Book ChapterDOI
01 Jan 1971
TL;DR: In this paper, an explanation of the vacuum technology involved and of the art of applying thin films is given in 2.2 and 2.3.2, respectively, with references to the literature are included wherever possible.
Abstract: The coating of surfaces by vacuum deposition is an art already having a wide range of uses. Evaporation takes place in a vacuum. An explanation of the vacuum technology involved and of the art of applying thin films is given in 2.2 and 2.3. An explanation of sputtering is given in 2.3.2. Optical and electrical applications will be discussed in 2.4. Lastly, Section 2.5 deals with the measurement of film thicknesses. Although some aspects have had to be discussed rather briefly, references to the literature are included wherever possible. Where practical considerations demand this, we have departed from the so-called rational system of units (ISO).

2 citations