Thermal diffusivity of POCO AXM-5Q1 graphite in the range 1500 to 2500 K measured by a laser-pulse technique

1994 ◽  
Vol 15 (2) ◽  
pp. 343-364 ◽  
Author(s):  
T. Baba ◽  
A. Cezairliyan
Keyword(s):  
Thermal Diffusivity ◽  
Laser Pulse ◽  
Pulse Technique

Thermal Diffusivity of Diamond Films Using a Laser Pulse Technique

1990 ◽  
Vol 137 (6) ◽  
pp. 1973-1976 ◽  
Author(s):  
Sacharia Albin ◽  
William P. Winfree ◽  
B. Scott Crews
Keyword(s):  
Thermal Diffusivity ◽  
Laser Pulse ◽  
Diamond Films ◽  
Pulse Technique

Measurement of Thermal Diffusivity by Laser Pulse

1967 ◽  
Vol 6 (8) ◽  
pp. 1019-1019 ◽  
Author(s):  
Susumu Namba ◽  
Pil Hyon Kim ◽  
Tsutomu Arai ◽  
Takeo Kikuchi
Keyword(s):  
Thermal Diffusivity ◽  
Laser Pulse

scholarly journals Effect of self focusing on the prolongation of laser produced plasma channel

2009 ◽  
Vol 27 (1) ◽  
pp. 33-39 ◽  
Author(s):  
U. Verma ◽  
A.K. Sharma
Keyword(s):  
Theoretical Model ◽  
Time Delay ◽  
Laser Pulse ◽  
Density Profile ◽  
Plasma Channel ◽  
Ion Density ◽  
Pulse Technique ◽  
Recombination Time ◽  
Self Focusing ◽  
Gaseous Plasma

AbstractA theoretical model for the prolongation of lifetime of a gaseous plasma channel formed by two pulse technique at laser intensities below the tunnel ionization threshold is developed. The first laser pulse ionizes the gas completely on the axis and partially off the axis, causing self-defocusing of the pulse. After the passage of the pulse, the plasma expands radially, creating an atom/ion density profile with a minimum on the axis. Partial recombination also sets in. As the second pulse arrives, after a time delay of less than the recombination time (~ns), the electrons get heated, and the recombination rate is slowed down. The second pulse self focuses, enhancing the heating rate and lengthening the lifetime of the plasma channel.

Thermal Diffusivity of Uranium by Laser Pulse Method from 20°to 850°C

1968 ◽  
Vol 7 (6) ◽  
pp. 682-682 ◽  
Author(s):  
Shōichi Nasu ◽  
Susumu Fukushima ◽  
Toshihiko Ohmichi ◽  
Takeo Kikuchi
Keyword(s):  
Thermal Diffusivity ◽  
Laser Pulse ◽  
Pulse Method ◽  
Laser Pulse Method

A pulsed method for thermal-diffusivity measurements of polymer films with submicrometre thickness

1986 ◽  
Vol 64 (9) ◽  
pp. 1200-1203 ◽  
Author(s):  
H. Coufal ◽  
P. Hefferle
Keyword(s):  
Thin Films ◽  
Thermal Diffusivity ◽  
Laser Pulse ◽  
Heat Source ◽  
Polymer Films ◽  
Heat Pulse ◽  
Diffusivity Measurements ◽  
Pulsed Measurements

The use of pyroelectric calorimeters for pulsed measurements of the thermal diffusivity of thin films is described. The material under study is directly coated on to a pyroelectric calorimeter. A transient heat source is generated at the surface of the sample via absorption of a laser pulse. By analysis of the transmitted heat pulse, the thermal diffusivity of the sample can be determined. The potentials of this method are demonstrated on polymer films with thicknesses in the submicrometre range.

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