By Hiroaki Misawa, Saulius Juodkazis
An intensive advent to 3D laser microfabrication know-how, prime readers from the basics and conception to its quite a few effective purposes, reminiscent of the new release of tiny items or three-d buildings in the bulk of obvious fabrics. The publication additionally offers new theoretical fabric on dielectric breakdown, permitting a greater realizing of the variations among optical harm on surfaces and contained in the bulk, in addition to a glance into the longer term. Chemists, physicists, fabrics scientists and engineers will locate this a worthwhile resource of interdisciplinary wisdom within the box of laser optics and nanotechnology.
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An intensive creation to 3D laser microfabrication expertise, major readers from the basics and thought to its quite a few effective functions, akin to the iteration of tiny gadgets or three-d constructions in the bulk of obvious fabrics. The ebook additionally offers new theoretical fabric on dielectric breakdown, permitting a greater knowing of the variations among optical harm on surfaces and contained in the bulk, in addition to a glance into the long run.
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Extra info for 3D laser microfabrication : principles and applications
The strong spherical shock wave starts to propagate outside the center of symmetry at radius rshock. The pressure behind the shock decreases as r–3. Therefore, the shock remains strong and compresses material only over a short distance Dr, (r > Dr) to an average compression ratio of d = q/q0. 2 the void radius is comparable to that for shock formation. In fact, many other processes after the end of the pulse, during cooling and phase transformation can also affect the final size of the void. Another estimate of the void radius is based on the assumption of isentropic expansion [38, 39].
Miwa, S. Juodkazis, T. Kawakami, S. Matsuo, H. Misawa, Femtosecond twophoton stereo lithography, Appl. Phys. A, 73, 561–566, (2001). 18 Y. Kawata, H. Ueki, Y. Hashimoto, and S. Kawata, Three-dimensional optical memory with a photo-refractive crystal, Appl. , 34, 4105–4110, (1995). A. A. S. Chirkin, Optics of Femtosecond Laser Pulses, (Moscow, Nauka, 1988). 20 E. Yablonovitch and N. Bloembergen, Avalanche ionization and the limiting diameter of filaments induced by light pulses in transparent media, Phys.
Therefore the actual structural damage (breaking inter-atomic bonds) occurs after electron-to-lattice energy transfer, usually after the pulse end. 2 1013 W cm–2 . 8 ‚ 1) 1013 W cm–2 were measured in the interaction of a 120 fs, 620 nm laser with glass, MgF2, sapphire, and fused silica . This behavior is to be expected, since all transparent dielectrics share the same general properties of slow thermal diffusion, fast electron–phonon scattering and similar ionization rates. The breakdown threshold fluence (J cm–2) is an appropriate parameter for characterization conditions at different pulse duration.