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Formation of nano-voids in transparent dielectrics by femtosecond lasers
Eugene G. Gamaly,Saulius Juodkazis,Hiroaki Misawa,Barry Luther-Davies,Andrei V. Rode,Ludovic Hallo,Philippe Nicolai,Vladimir T. Tikhonchuk 한국물리학회 2008 Current Applied Physics Vol.8 No.3,4
Formation of three-dimensional (3D) patterns of 0.20.5l m diameter voids inside a transparent solid has been demonstrated.The nano-voids could be created with a spacing. 2 l m thus suggesting the possibility of permanent 3D optical memory with density. 100 Gbit/cm3. Extremely high pressures of. 10 TPa and temperatures up to 105 K can be produced by a single sub-picosecondlaser pulse tightly focused inside transparent dielectrics. Analysis of the size of the void and the shock aected zone as a functionof the deposited energy shows that the experimental results can be explicitly understood on the basis of conservation laws and beand laser parameters.
Eugene G. Gamaly,Saulius Juodkazis,Vygantas Mizeikis,Hiroaki Misawa,Andrei V. Rode,Wieslaw Z. Krolikowski,Kenji Kitamura 한국물리학회 2008 Current Applied Physics Vol.8 No.3,4
We report on a three-dimensional single-shot optical recording by 150 fs pulses at 800 nm wavelength in Fe-doped and stoichiometricundoped LiNbO 3. The highest refractive index modulation of. 10. 3 per single pulse has been achieved at close to the dielectric break-down irradiance of. TW/cm2, and was found to be independent of polarization of the writing beam. The quasi-permanent and rewrit-able bits have been demonstrated in Fe-doped LiNbO3. Recording in undoped stoichiometric LiNbO3 was of transient nature with fulloptical contrast recovery on a 0.11 s scale. The observed refractive index modulation is explainable by the photovoltaic eect inLiNbO 3.