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9 Apr 2001

Volume 78, Issue 15, pp. 2095-2255

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Alignment of grain boundary in a Si film crystallized by a linearly polarized laser beam on a glass substrate

Susumu Horita, Y. Nakata, and A. Shimoyama

Appl. Phys. Lett. 78, 2250 (2001); http://dx.doi.org/10.1063/1.1362336 (3 pages) | Cited 9 times

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We performed crystallization of an amorphous Si film deposited on a Pyrex glass substrate using a Nd:YAG pulse-laser beam with linear polarization. It was found that, in the crystallized film, the grain boundaries were aligned with a period of about 550 nm or the wavelength of the laser beam. Meanwhile, in the Si film crystallized by circularly polarized beam that passed through the λ/4 plate, the grain boundaries were randomly generated. This means that linear polarization of the laser beam is essential to align grain boundaries periodically or to produce a periodic temperature distribution in the irradiated Si film. © 2001 American Institute of Physics.
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68.55.A- Nucleation and growth
61.80.Ba Ultraviolet, visible, and infrared radiation effects (including laser radiation)
61.82.Fk Semiconductors
61.72.Mm Grain and twin boundaries
68.55.Ln Defects and impurities: doping, implantation, distribution, concentration, etc.

Vacuum electron acceleration by an intense laser

P. X. Wang, Y. K. Ho, X. Q. Yuan, Q. Kong, N. Cao, A. M. Sessler, E. Esarey, and Y. Nishida

Appl. Phys. Lett. 78, 2253 (2001); http://dx.doi.org/10.1063/1.1359486 (3 pages) | Cited 64 times

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Using three dimensional test particle simulations, the characteristics and essential conditions under which an electron, in a vacuum laser beam, can undergo a capture and acceleration scenario (CAS) have been examined. When a0≳100 the electron can be captured and violently accelerated to energies ≳1 GeV, with an acceleration gradient ≳10 GeV/cm, where a0 = eE0/meωc is the normalized laser field amplitude. The physical mechanism behind the CAS is that diffraction of the focused laser beam leads to a slowing down of the effective wave phase velocity along the captured electron trajectory, such that the electron can be trapped in the acceleration phase of the wave for a longer time and thus gain significant energy from the field. © 2001 American Institute of Physics.
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41.75.Jv Laser-driven acceleration
41.75.Ht Relativistic electron and positron beams
29.20.-c Accelerators
41.85.Ct Particle beam shaping, beam splitting
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