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Article information
2017 , Volume 22, ¹ 6, p.35-47
Zhukov V.P., Bulgakova N.M., Fedoruk M.P.
The modelling of nonreciprocal writing
Volumetric modification of transparent materials by femtosecond laser pulses (FLP) is usually carried out in multipulse irradiation regimes by focusing of laser beam into material bulk. Theoretical investigations of multipulse regimes are usually limited to estimations which do not take into account laser light scattering by free electron plasma. This plasma is generated by ionization of both valence electrons and defects accumulated in the irradiation region from pulse to pulse and resulting in local changes of material refractive index. In this work, numerical modelling of FLP action on fused silica has been performed for multipulsed regime using focusing to the sample depth. The model is based on solution of non-linear Maxwell’s equations supplemented by the hydrodynamic-type equations for the plasma of electrons, which are excited by radiation to the conduction band. It takes into account effects connected with pulseto-pulse defect accumulation in glass. It is shown that accumulation of defects (color centers in glass), their ionization by subsequent laser pulses, and refractive index variation connected with color centers play a crucial role in the dynamics of radiation absorption in the multipulse regimes of glass modification. Additionally, in a number of experiments on multipulse writing of modification structures to the bulk of moving material samples, we observe the dependence of modification degree on the direction of sample motion relative to the laser beam (writing anisotropy). The effect of such asymmetric writing is usually explained by the tilted front of ultrashort laser beams. In the present work the numerical modelling of the action of the pulses with tilted front has been carried out for the first time and indeed it is shown that the tilted front could cause writing anisotropy.
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Keywords: femtosecond laser pulses, defects, color centers, glass memory, multipulse regime, anisotropic writing, femtowriting, pulse front tilt, nonlinear Maxwells equations
Author(s):
Zhukov Vladimir Petrovich
Dr.
Position: Senior Research Scientist
Office: Federal Research Center for Information and Computational Technologies
Address: 630090, Russia, Novosibirsk, Ac. Lavrentiev ave., 6
Phone Office: (383) 330 97 72
E-mail: zuk@ict.nsc.ru
Bulgakova Nadezhda Mikhailovna
Dr. , Senior Scientist
Position: General Scientist
Office: Kutateladze Institute of Thermophysics Siberian Branch of the RAS
Address: 630090, Russia, Novosibirsk, 1, Ac. Lavrentieva ave
Phone Office: (383) 330-70-50
E-mail: nbul@itp.nsc.ru
Fedoruk Mikhail Petrovich
Dr. , Academician RAS, Professor
Position: Chancellor
Office: Novosibirsk State University, Federal Research Center for Information and Computational Technologies
Address: 630090, Russia, Novosibirsk, str. Pirogova, 2
Phone Office: (3832) 349105
E-mail: mife@net.ict.nsc.ru
SPIN-code: 4929-8753 References:
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Bibliography link:
Zhukov V.P., Bulgakova N.M., Fedoruk M.P. The modelling of nonreciprocal writing // Computational technologies. 2017. V. 22. ¹ 6. P. 35-47
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