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Laser Optics & Photonics and Atomic & Plasma Science 2018
J u l y 1 6 - 1 7 , 2 0 1 8
P r a g u e , C z e c h R e p u b l i c
Page 39
American Journal of Computer Science and Information Technology
ISSN: 2349-3917
E u r o S c i C o n J o i n t E v e n t o n
Laser Optics & Photonics and
Atomic & Plasma Science
Sergey S Fedotov et al., Am J Compt Sci Inform Technol 2018, Volume 6
DOI: 10.21767/2349-3917-C1-002
Nanogratings are birefringent nanoperiodical structures generated inside
glasses by a series of femtosecond laser pulses at certain pulse energies
under melting threshold. They attract much attention due to their birefringence
which can be controlled by the writing femtosecond beam that provides
applications for devices with patterned birefringence such as polarization
converters and ultrastable multilevel data storage, whereas enhanced
chemical activity of nanogratings is used for selective etching of microfluidic
components. Nanogratings were first revealed and studied in silica glass and
recently demonstrated in several multicomponent glasses but there is still
poor information about mechanism of their inscription depending on glass
composition. Recently, we have demonstrated an effect of laser-induced
nanoperiodical redistribution of Na+ cations accompanying nanograting
inscription in sodiumsilicate glass by 10 6-107 pulses. Here, we report possibility
of nanograting formation in a set of R 2O-SiO2 glasses (R = Li, Na, K). We show
that nanogratings can be inscribed in alkali silicate glasses by the number
of pulses below 104 (two orders of magnitude faster than demonstrated for
sodium silicate glass earlier) only in the narrow pulse energy range, which is
quite different from silica glass. Surprisingly, though nanograting formation
is possible at higher pulse energy, it takes much more pulses than in optimal
pulse energy range. This effect is presumably attributed to the laser-induced
chemical shift towards to lower alkali content and higher melting point, which
takes place under a large number of laser pulses and allows formation of a
nanograting instead of melting at a given pulse energy. Micro- and nanoscale
chemical redistribution opens an opportunity of precision control of physical
and chemical properties of predetermined microregions in multicomponent
glasses for applications in photonics and optofluidics.
Biography
Sergey Fedotov has completed his PhD from Mendeleev
University of Chemical Technology of Russia. He is researcher
in the International Centre of Laser Technology of Mendeleev
University of Chemical Technology of Russia. He has published
8 papers in reputed journals.
Ultrafast laser-induced inscription of nanogratings in alkali
silicate glasses
Sergey S Fedotov, Sergey V Lotarev, Alexey S Lipatiev, Alyona I
Kurina and Vladimir N Sigaev
Mendeleyev University of Chemical Technology of Russia, Russia