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Dive into the research topics where Alexander Mikhailovich Streltsov is active.

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Featured researches published by Alexander Mikhailovich Streltsov.


Optics Letters | 2001

Fabrication and analysis of a directional coupler written in glass by nanojoule femtosecond laser pulses

Alexander Mikhailovich Streltsov; Nicholas F. Borrelli

A directional coupler written in a glass sample by the focused 400-nm output from a 25-fs oscillator is reported. The coupler is single mode; the splitting ratio is 1.9 dB at 633 nm. A refractive-index profile of the waveguide with a magnitude of Dn = 4.5 x 10(-3) was retrieved from a near-field mode pattern.


Proceedings of the National Academy of Sciences of the United States of America | 2003

Rare earth-doped glass microbarcodes

Matthew John Dejneka; Alexander Mikhailovich Streltsov; Santona Pal; Anthony G. Frutos; Christy Lynn Powell; Kevin Joseph Yost; Po Ki Yuen; Uwe R. Müller; Joydeep Lahiri

The development of ultraminiaturized identification tags has applications in fields ranging from advanced biotechnology to security. This paper describes micrometer-sized glass barcodes containing a pattern of different fluorescent materials that are easily identified by using a UV lamp and an optical microscope. A model DNA hybridization assay using these “microbarcodes” is described. Rare earth-doped glasses were chosen because of their narrow emission bands, high quantum efficiencies, noninterference with common fluorescent labels, and inertness to most organic and aqueous solvents. These properties and the large number (>1 million) of possible combinations of these microbarcodes make them attractive for use in multiplexed bioassays and general encoding.


Journal of Applied Physics | 2008

Origin of the refractive-index increase in laser-written waveguides in glasses

Carl W. Ponader; Joseph Francis Schroeder; Alexander Mikhailovich Streltsov

We present firm evidence that the mechanism for the refractive-index increase in fused silica caused by irradiation with ultrafast intense laser pulses is the densification of glass. This conclusion is based on the correlation observed between the refractive-index values in waveguides in silica produced by focused femtosecond laser pulses and the shift of the central frequency of ω4 (TO) band (Si–O stretching mode) in micro-Raman spectra. These data were compared with the relation of the Raman shift to density and to refractive index changes in glasses modified by high pressure or irradiation. We conclude that the measured refractive-index increase in silica waveguides can be explained by densification of glass and exclude other hypothesis such as fictive-temperature effect, color center formation, etc.


Optics Express | 2009

Extraordinary laser-induced swelling of oxide glasses

Richard Robert Grzybowski; Stephan Lvovich Logunov; Alexander Mikhailovich Streltsov; James Scott Sutherland

We describe a novel process of laser-assisted fabrication of surface structures on doped oxide glasses with heights reaching 10 - 13% of the glass thickness. This effect manifests itself as a swelling of the irradiated portion of the glass, which occurs in a wide range of glass compositions. The extent of such swelling depends on the glass base composition. Doping with Fe, Ti, Co, Ce, and other transition metals allows for adjusting the absorption of the glass and maximizing the feature size. In the case of bumps grown on borosilicate glasses, we observe reversible glass swelling and the bump height can increase or decrease depending on whether the consecutive laser pulse has higher or lower energy compared with the previous one. The hypothetical mechanism includes laser heating of glass, glass melting, and directional flow. We review several potential applications of such glass swelling.


Proceedings of SPIE | 2010

Laser texturing of doped borosilicate glasses

Alexander Mikhailovich Streltsov; James E. Dickinson; Richard Robert Grzybowski; Daniel Ralph Harvey; Stephan Lvovich Logunov; Alper Ozturk; James Scott Sutherland; Marcel Potuzak

We describe a novel process of laser-assisted fabrication of surface structures on doped oxide glasses with heights reaching 10 - 13% of the glass thickness. This effect manifests itself as a swelling of the irradiated portion of the glass, and occurs in a wide range of glass compositions. The extent of such swelling depends on the glass base composition. Doping with Fe, Ti, Co, Ce, and other transition metals allows for adjusting the absorption of the glass and maximizing the feature size. In the case of bumps grown on borosilicate glasses, we observe reversible glass swelling and the bump height can increase or decrease depending on whether the consecutive laser pulse has higher or lower energy compared with the previous one. To understand the hypothetical mechanism, which includes laser heating of glass, glass melting, and directional flow, we explored density, refractive index, fictive temperature, and phase separation dynamics.


Proceedings of SPIE, the International Society for Optical Engineering | 2009

Laser-written high-contrast waveguides in glass

Alexander Mikhailovich Streltsov; Nicholas F. Borrelli; James E. Dickinson; Timothy James Kiczenski; Stephan Lvovich Logunov; Joseph Francis Schroeder

Laser writing of waveguides in bulk glasses opens the opportunity for creating three-dimensional photonic devices. In order to become practical, the numerical aperture (NA) of these waveguides should be significantly higher than currently achievable of 0.1 - 0.15. One reason is that with higher NAs one can decrease the bending radii of the embedded photonic devices without significant loss penalty and make them compact. Thus, femtosecond-laser-written waveguides in glasses do not allow bending radii smaller than 15 - 20 mm. In order to overcome this limitation, we propose to fabricate waveguides in phase-separable and leachable glass where the index contrast is determined by the difference between the refractive indices of the unprocessed glass and of the leached porous glass. We show that we can achieve the NA = 0.25 prior to optimization. Surface and sub-surface treatment with a nanosecond ultraviolet (UV) laser produces a similar effect with even higher NA = 0.35. Applications may include a range of tightly packed embedded and three-dimensional photonic devices in bulk glass like directional couplers, splitters, interferometers, etc.


Laser Processing and Fabrication for Solar, Displays, and Optoelectronic Devices III | 2014

Laser processing of glass for consumer electronics: opportunities and challenges

Anping Liu; Alexander Mikhailovich Streltsov; Xinghua Li; Anatoli Anatolyevich Abramov

Laser processing has demonstrated great capabilities for processing the flat panel display glass, strengthened glass, and flexible glass for consumer electronics. In this paper, a variety of laser processing techniques and their applications are discussed. The techniques include glass cutting, drilling, and surface modification. To assess each technique, a matrix of criteria, such as speed, surface quality, strength, and process stability is proposed. Based on the matrix, future needs for laser processing of glass are outlined.


Proceedings of SPIE, the International Society for Optical Engineering | 2010

Laser-formed bumps on glass for precision alignment of planar optical components

James Scott Sutherland; Alexander Mikhailovich Streltsov; Richard Robert Grzybowski; B. Roe Hemenway

This paper describes hybrid assembly of a wavelength selective switch using laser-formed glass bumps. Recently, a process was developed for forming raised bumps on IR-absorbing glass substrates using a focused laser beam. Glass bumps with heights exceeding 90 μm have been formed with an accuracy of ~100 nm using multiple laser shots. Proper selection of materials permits the bump height to be raised or lowered via subsequent laser shots by adjusting laser power. Processes are described for precision alignment of planar AWG components to a pedestal-mounted planar SOA array by forming three glass laser bumps beneath the AWG components. While the iterative process of bump formation and component position assessment was performed manually, this work demonstrates that the process is predictable and well-suited for automation.


Proceedings of SPIE, the International Society for Optical Engineering | 2006

Refractive-index increase in laser-written waveguides in glasses

Alexander Mikhailovich Streltsov; Carl W. Ponader; Joseph Francis Schroeder

We present estimates of the refractive-index change in waveguides in silica produced by focused femtosecond laser pulses. The estimates are based on the shift of the central frequency of ω4 (TO) band (Si-O stretching mode) in micro-Raman spectra. These data were compared with the relation of this parameter to density and to refractive index changes in seen in glasses modified by high pressure or irradiation. We conclude that the measured refractive-index increase in the waveguides can be explained by densification of glass.


Archive | 2004

Glass package that is hermetically sealed with a frit and method of fabrication

Bruce Gardiner Aitken; Joel P. Carberry; Steven Edward Demartino; Henry E. Hagy; Lisa Ann Lamberson; J. Miller Ii Richard; Robert Michael Morena; Joseph Francis Schroeder; Alexander Mikhailovich Streltsov; Sujanto Widjaja

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