Electrooptic lithium tantalate switch

Zverev, G. M.; Kalinin, D G; Кузнецов, Ю. Н.; Naumov, V L; Pashkov, V. A.

doi:10.1070/qe1980v010n07abeh010486

Cited by 4 publications

(3 citation statements)

References 1 publication

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“…We confirmed that the length of the induced structure was directly proportional to the square root of the average power of the laser beam. If we assume that the length of the induced structure is directly proportional to the length of the filament, the result is in a good agreement with the theory of Zverev et al25 Therefore, filamentation due to the balance of self‐focusing arose from increase in refractive index and self‐defocusing arose from plasma formation takes an important role in the oxidation of Mn 2+ to Mn 3+ . The trap levels of defect centers may be deep, thus resulting into the stable Mn 3+ at room temperature.…”

Section: Space‐selective Valence State Manipulation Of Transition Andsupporting

confidence: 86%

Femtosecond laser‐induced microstructures in glasses and applications in micro‐optics

Qiu

2004

The Chemical Record

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Femtosecond laser has been widely used in microscopic modifications to materials due to its ultra-short laser pulse and ultrahigh light intensity. When a transparent material e.g. glass is irradiated by a tightly focused femtosecond laser, the photo-induced reaction is expected to occur only near the focused part of the laser beam inside the glass due to the multiphoton processes. We observed various induced structures e.g. color center defects, refractive index change, micro-void and micro-crack, in glasses after the femtosecond laser irradiation. In this paper, we review the femtosecond laser induced phenomena and discuss the mechanisms of the observed phenomena. We also introduce the fabrication of various micro-optical components, e.g. optical waveguide, micro-grating, micro-lens, fiber attenuator, 3-dimensional optical memory by using the femtosecond laser-induced structures. The femtosecond laser will open new possibilities in the fabrication of micro-optical components with various optical functions.

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Section: Space‐selective Valence State Manipulation Of Transition Andsupporting

confidence: 86%

Femtosecond laser‐induced microstructures in glasses and applications in micro‐optics

Qiu

2004

The Chemical Record

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“…We also confirmed that the length of the femtosecond laser induced structure was directly proportional to the square root of the average power of the laser beam. This result is in good agreement with the theory of Zverev et al, 25 if we assume that the length of the induced structure is directly proportional to the length of the filament, which is due to the balance between self-focusing arising from an increase in the refractive index and selfdefocusing arising from plasma formation. We have also confirmed that no change is observed in the absorption spectrum of the nanoparticle-precipitated glass sample after heat treatment at room temperature even for 6 months, indicating that the precipitated nanoparticles are stable at room temperature.…”

supporting

confidence: 91%

Space-selective precipitation of metal nanoparticles inside glasses

Qiu¹,

Shirai²,

Nakaya³

et al. 2002

Applied Physics Letters

152

109

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We report the precipitation and control of metal nanoparticles inside transparent glasses. An Ag ϩ -doped silicate glass sample was first irradiated by using an 800 nm femtosecond laser at room temperature and then annealed at 550°C. The area near the focal point of the laser beam became gray after laser irradiation and yellow after further annealing at 550°C for 10 min. Absorption and electron spin resonance spectra of the glass sample showed that a portion of silver ions near the focused part of the laser beam inside the glass were reduced to silver atoms after the laser irradiation. These silver atoms aggregated to form nanoparticles after further annealing at temperatures above 500°C. A mechanism is suggested that consists of multiphoton reduction, which is induced by the fundamental light of the laser beam and supercontinuum white light, and diffusion of silver atoms driven by heat energy to form nanoparticles. The observed phenomenon may have promising applications for the fabrication of three-dimensional multicolored images inside a transparent material and for integrative micro-optical switches.

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“…For these results, we assumed that the length of the induced structure varies with the depth of the focal spot, because the length is largely dependent on the linear and non-linear refractive index of the material. Zverev and Pashkov demonstrated that the filamentation length, L fil , generated by self-focusing of the laser radiation in solid dielectrics is expressed as follows [36]:…”

Section: Filamentation-dependent Induced Structurementioning

confidence: 99%