Download e-book for iPad: Laser-Beam Interactions with Materials: Physical Principles by Martin v. Allmen, Andreas Blatter

By Martin v. Allmen, Andreas Blatter

ISBN-10: 3642970079

ISBN-13: 9783642970078

ISBN-10: 3642970095

ISBN-13: 9783642970092

Laser-Beam Interactions with Materials treats, from a physicist's perspective, the big variety of techniques that lasers can set off in fabrics. actual phenomena starting from optics to surprise waves are mentioned, as are purposes in such different fields as semiconductor annealing, gap drilling and fusion plasma construction. The method taken emphasizes the elemental rules and their interrelations. The newcomer is given the required vital historical past fabric, whereas the energetic study employee reveals a serious and accomplished assessment of the sphere.

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Extra info for Laser-Beam Interactions with Materials: Physical Principles and Applications

Example text

Let us now consider the role played by the carrier plasma in the beam-solid interaction. The plasma may be regarded as an independent system which absorbs light and exchanges energy with the lattice. The plasma gains energy from interband absorption (an amount of ~w - Eg per carrier pair) as well as from free-carrier absorption. Furthermore, if Auger processes dominate the recombination, an amount Eg is added to the plasma energy for every recombination event. The plasma loses energy by carrier diffusion - every carrier pair carrying away its mean excess energy - and by phonon emission which heats the lattice.

In all other cases of practical interest the dominant mechanism of carrier generation in insulators is impact ionization. Impact ionization is the inverse process of Auger recombination: Upon colliding with a lattice atom an energetic carrier is slowed down while creating an additional low-energy carrier pair (an extra electron being knocked off the atom, leaving behind a hole). In the presence of an electric field the new carriers are accelerated again until the process repeats, and a carrier avalanche develops.

1 0. • ....... "0. 5 . '-. ::::-- ~ ...... 1. Normalized temperature distributions for uniform heat sources as a function of normalized depth . Numbers indicate the ratio of the absorption length a- 1 to the diffusion length 8 = 2J~t 55 the profile deeper within the solid. 1 ns, i. , whenever the present linear theory holds). In the other extreme, for ~ « l/a, the temperature distribution essentially follows the exponential absorption profile. 5], Io denotes the zero. 8) is due to a source of infinite power).

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Laser-Beam Interactions with Materials: Physical Principles and Applications by Martin v. Allmen, Andreas Blatter

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