Influence of the Beam Irradiation Condition With Oblique Incidence on Crystallization of an Si film by a Linearly Polarized Pulse Laser

2002 ◽  
Vol 715 ◽  
Author(s):  
Yasunori Nakata ◽  
Hirokazu Kaki ◽  
Susumu Horita
Keyword(s):  
Grain Boundary ◽  
Film Thickness ◽  
Pulse Laser ◽  
Oblique Incidence ◽  
Incident Angle ◽  
Pulse Number ◽  
Experimental Results ◽  
Irradiation Condition ◽  
Beam Irradiation ◽  
Linearly Polarized

AbstractWe investigated influence of the beam irradiation conditions with oblique incidence on crystallization of an Si film by a linearly polarized pulse laser in order to enlarge the periodic width of grain boundary. The irradiation conditions are fluence, pulse number and film thickness. We can obtain the periodic width of about 900 nm by increasing the incident angle to 25°. The experimental results suggest that the pulse number and the film thickness should be controlled properly as well as fluence in order to produce large grain stably for the oblique incidence. The detail of these conditions was discussed.

Formation of periodic grain boundary in an Si thin film crystallized by a linearly polarized Nd:YAG pulse laser with an ultra sonic oscillator

2004 ◽  
Vol 808 ◽  
Author(s):  
Hirokazu Kaki ◽  
Takehiko Ootani ◽  
Susumu Horita
Keyword(s):  
Grain Boundary ◽  
Pulse Laser ◽  
Pulse Number ◽  
Novel Technique ◽  
Thermal Distribution ◽  
Irradiation Pulse ◽  
Linearly Polarized ◽  
Boundary Location ◽  
Amorphous Si ◽  
Si Thin Film

ABSTRACTIn order to obtain a large silicon (Si) grain and to control the location of its boundary in a Si film melting-crystallized by a pulse laser, we have proposed to use periodic thermal distribution spontaneously induced by irradiation of a linearly polarized laser beam. We estimated the suitable amorphous Si (a-Si) thickness taking account of multiple reflection theoretically and confirmed it experimentally. Also, we proposed a novel technique to reduce the irradiation pulse number to control the grain boundary location stably in the crystallized Si film, in which the elastic wave was generated on the surface of a-Si film prior to melting-crystallization by using an ultra sonic oscillator. Owing to this technique, we can control the grain boundary location periodically with only 1 pulse irradiation in the crystallized Si film.

Effect of He-Injection on Irradiation Damage of High Mn-Cr Steel

2005 ◽  
Vol 475-479 ◽  
pp. 1425-1428
Author(s):  
Dong Su Bae ◽  
Sang Ll Lee ◽  
Seung Hoon Nahm ◽  
J.W. Choi ◽  
H. Takahashi
Keyword(s):  
Electron Beam ◽  
Grain Boundary ◽  
Electron Beam Irradiation ◽  
Boundary Migration ◽  
Void Formation ◽  
Irradiation Damage ◽  
Irradiation Condition ◽  
Beam Diameter ◽  
Beam Irradiation ◽  
Dual Beam

The high Mn-Cr austenitic steel for structure material of nuclear and/or fusion reactors from the point of view of the reduced radio-activation has been irradiated by using three irradiation modes of electron-beam irradiation, electron-beam irradiation after He-injection and electron/He+-ion dual-beam irradiation in 1250kV high voltage electron microscope (HVEM) connected with an ion accelerators to study the effect of He-injection on irradiation damage. Irradiation-induced segregation analyses were carried out by an energy dispersive X-ray analyzer (EDX) in a 200kV FE-TEM with beam diameter of about 0.5nm. Void formation was not observed in each irradiation condition. Grain boundary migration was observed in the case of electron/He+-ion dual-beam irradiation. Irradiation-induced segregations of Cr and Mn at grain boundary were observed in each irradiation condition. The amounts of Cr and Mn segregation decreased in the cases of electron-beam irradiation after He-injection compared with other irradiation conditions.

Multislice calculations of RHEED patterns from vicinal Si (001)

1993 ◽  
Vol 51 ◽  
pp. 1000-1001
Author(s):  
Scott Lordi
Keyword(s):  
Misorientation Angle ◽  
Incident Angle ◽  
Incident Beam ◽  
Experimental Results ◽  
Bragg Condition ◽  
Vicinal Surfaces ◽  
Kinematic Theory ◽  
Step Edges

Vicinal Si (001) surfaces are interesting because they are good substrates for the growth of III-V semiconductors. Spots in RHEED patterns from vicinal surfaces are split due to scattering from ordered step arrays and this splitting can be used to determine the misorientation angle, using kinematic arguments. Kinematic theory is generally regarded to be inadequate for the calculation of RHEED intensities; however, only a few dynamical RHEED simulations have been attempted for vicinal surfaces. The multislice formulation of Cowley and Moodie with a recently developed edge patching method was used to calculate RHEED patterns from vicinal Si (001) surfaces. The calculated patterns are qualitatively similar to published experimental results and the positions of the split spots quantitatively agree with kinematic calculations.RHEED patterns were calculated for unreconstructed (bulk terminated) Si (001) surfaces misoriented towards [110] ,with an energy of 15 keV, at an incident angle of 36.63 mrad ([004] bragg condition), and a beam azimuth of [110] (perpendicular to the step edges) and the incident beam pointed down the step staircase.

scholarly journals Short-pulse laser-driven x-ray radiography

2016 ◽  
Vol 4 ◽  
Author(s):  
E. Brambrink ◽  
S. Baton ◽  
M. Koenig ◽  
R. Yurchak ◽  
N. Bidaut ◽  
...  
Keyword(s):  
Pulse Laser ◽  
Short Pulse ◽  
Incident Angle ◽  
Laboratory Astrophysics ◽  
Signal To Noise ◽  
High Quality ◽  
X Ray ◽  
Short Pulse Laser ◽  
Short Pulse Lasers

We have developed a new radiography setup with a short-pulse laser-driven x-ray source. Using a radiography axis perpendicular to both long- and short-pulse lasers allowed optimizing the incident angle of the short-pulse laser on the x-ray source target. The setup has been tested with various x-ray source target materials and different laser wavelengths. Signal to noise ratios are presented as well as achieved spatial resolutions. The high quality of our technique is illustrated on a plasma flow radiograph obtained during a laboratory astrophysics experiment on POLARs.

Increased mobility of an α-Al2O3 grain boundary by electron-beam irradiation

2017 ◽  
Vol 53 (4) ◽  
pp. 2383-2388 ◽  
Author(s):  
Sung Bo Lee ◽  
Seung-Yong Lee ◽  
Miyoung Kim ◽  
Heung Nam Han
Keyword(s):  
Electron Beam ◽  
Grain Boundary ◽  
Electron Beam Irradiation ◽  
Beam Irradiation ◽  
Α Al2o3

Theoretical and experimental determinations of grain boundary structures and energies: Correlation with various experimental results

1972 ◽  
Vol 31 ◽  
pp. 115-137 ◽  
Author(s):  
G. Hasson ◽  
J.-Y. Boos ◽  
I. Herbeuval ◽  
M. Biscondi ◽  
C. Goux
Keyword(s):  
Grain Boundary ◽  
Experimental Results

Theoretical and experimental studies of the oil film in lubricated point contact

1966 ◽  
Vol 291 (1427) ◽  
pp. 520-536 ◽  
Keyword(s):  
Surface Layer ◽  
Film Thickness ◽  
Strong Evidence ◽  
Experimental Studies ◽  
Point Contact ◽  
Elastohydrodynamic Lubrication ◽  
Experimental Results ◽  
Point Contacts ◽  
Previous Theory ◽  
Oil Film

A technique using Newton’s rings for mapping the oil film of lubricated point contacts is described. A theoretical value for the film thickness of such contacts in elastohydrodynamic lubrication is derived. The experimental results give the exit constriction predicted by previous theory but never shown in detail. The comparison of theoretical and experimental oil film thicknesses, which is satisfactorily accurate, gives strong evidence for a viscous surface layer some 1000Å thick. This film agrees with the known ‘lubricating power’ of the various oils tested.

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