Read e-book online 3D Laser Microfabrication: Principles and Applications PDF

By Sami Franssila

ISBN-10: 0470851058

ISBN-13: 9780470851050

An intensive creation to 3D laser microfabrication know-how, major readers from the basics and idea to its a number of effective purposes, akin to the iteration of tiny items or 3-dimensional buildings in the bulk of obvious materials.The booklet additionally provides new theoretical fabric on dielectric breakdown, permitting a greater realizing of the diversities among optical harm on surfaces and contained in the bulk, in addition to a glance into the future.Chemists, physicists, fabrics scientists and engineers will locate this a necessary resource of interdisciplinary wisdom within the box of laser optics and nanotechnology.

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After unloading, the shock-affected material then has to be transformed into a final state at normal pressure. The final state may possess properties different from those in the initial state. We consider, in succession, the stages of compression and phase transformation, pressure release and material transformation into a post-shock state. 5 Shock Wave Expansion and Stopping The shock wave propagating in a cold material loses its energy due to dissipation, and it gradually transforms into the sound wave.

At low intensity when the electron temperature just exceeds the Debye temperature the electron–phonon rate grows with an increase in temperature. For SiO2 meff ~ 5 ” 1014 s–1 [23]. The light frequency (for visible light, x ‡ 1015 s–1) exceeds the collision rate, x > meff. It follows from (24) that ionization rate then growth in proportion to the square of the laser wavelength in correspondence with the Monte Carlo solutions of the Boltzmann equation for electrons [23]. With further increase in temperature the effective electron–lattice collision rate responsible for momentum exchange saturates at the plasma frequency (~1016 s–1) [1].

Furthermore, we do not know how the transition to spherical symmetry at high intensity occurs. We do not know the real shape of the cavity, the exact phase state and the distribution in space of the laser-modified material, which will be important for the formation of a 3D photonic crystal (iii) On the basis of knowledge gained from existing experimental and theoretical studies we can predict semi-quantitatively (with an accuracy in the range 40–50%) the result of the laser–matter interaction at high intensity (~ 1014 W cm–2); the size of the cavity (not its shape); and the possible material changes (very approximate range for density and refraction index changes).

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3D Laser Microfabrication: Principles and Applications by Sami Franssila


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