Photoinduced Bragg gratings in As_2S_3 optical fibers

Tanaka, Keiji; Toyosawa, Naoko; Hisakuni, H.

doi:10.1364/ol.20.001976

Cited by 65 publications

(18 citation statements)

References 8 publications

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“…In addition, above bandgap irradiation is associated with high absorption that is sufficient to induce a significant warming and even potential damage, while sub-bandgap irradiation has a negligible thermal contribution under standard irradiation power. Several proofs of the optical origin and athermal nature of photoinduced effects exist including the fact that photofluidity is more pronounced at low temperature [10] and exhibits polarization effects [19] or the formation of wavelength specific Bragg gratings [20]. Nevertheless, it has been recently suggested that the thermal contribution to the photoexpansion itself may not be negligible even for weakly absorbed light [21].…”

Section: Introductionmentioning

confidence: 99%

Mechanical model of giant photoexpansion in a chalcogenide glass and the role of photofluidity

Buisson

Guéguen

Laniel

et al. 2017

Physica B: Condensed Matter

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Abstract. An analytical model is developed to describe the phenomenon of giant photoexpansion in chalcogenide glasses. The proposed micro-mechanical model is based on the description of photoexpansion as a new type of eigenstrain, i.e. a deformation analogous to thermal expansion induced without external forces. In this framework, it is the viscoelastic flow induced by photofluidity which enable the conversion of the self-equilibrated stress into giant photoexpansion. This simple approach yields good fits to experimental data and demonstrates, for the first time, that the photoinduced viscous flow actually enhances the giant photoexpansion or the giant photocontraction as it has been suggested in the literature. Moreover, it highlights that the shear relaxation time due to photofluidity controls the expansion kinetic. This model is the first step towards describing giant photoexpansion from the point of view of mechanics and it provides the framework for investigating this phenomenon via numerical simulations.

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Section: Introductionmentioning

confidence: 99%

Mechanical model of giant photoexpansion in a chalcogenide glass and the role of photofluidity

Buisson

Guéguen

Laniel

et al. 2017

Physica B: Condensed Matter

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“…This results in a change of the λ min value as the illumination goes. Using equation (5), the mean effective refractive index at saturation was determined to be 5.5×10 −2 . The effective refractive index modulation, is related to the maximum attenuation T , the Bragg wavelength λ B and grating length L by 7 :…”

Section: Resultsmentioning

confidence: 99%

“…4 This leads to a variation of the As 2 S 3 refractive index on a wide spectral range, particularly, around telecommunications wavelengths. 5,6 In integrated optics, a periodic modulation of the refractive index can allow, if the phase matching condition 7 between the grating vector and the forward propagating mode is respected, the creation of a reflected counter-propagating mode. The characteristics of this mode depend of several parameters like the energy per unit area (fluence) of the recording beam, the structure of the waveguide used, etc.…”

Section: Introductionmentioning

confidence: 99%

Real-time analysis of a Bragg gratings formation in an As 2 S 3 channel waveguide

et al. 2003

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This paper presents the real-time observation of the Bragg grating formation in As 2 S 3 channel waveguides. Channel waveguides (width∼10µm) are obtained by a photolithographic process applied to a thin layer (∼ 0.6µm) of thermally evaporated As 2 S 3 . The photoinduced variation of the refractive index is the principal mechanism involved in the formation of the Bragg grating. We used a typical holographic setup, with an Argon ion laser as recording source (514nm), to photoinduce gratings with Bragg wavelength ranging in telecommunication window (1530-1600nm). The time evolution of the transmission spectrum during illumination is also presented and analyzed here.

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“…[16][17][18][19][20][21][22] Both photostructural and photodarkening changes were observed. We investigated direct-laser written diffraction grating fabrication in chalcogenide thin films for waveguide coupler applications 23 in the MWIR.…”

Section: Grating Fabricationmentioning

confidence: 97%

Advanced quantum cascade laser transmitter architectures and infrared photonics development

Anheier

Allen

Myers

2004

Quantum Sensing and Nanophotonic Devices

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Quantum cascade lasers (QCLs) provide a viable infrared laser source for a new class of laser transmitters capable of meeting the performance requirements for a variety of national security and civilian applications. The high output power, small size, and superb stability and modulation characteristics of QCLs make them amenable for integration as transmitters into ultra-sensitive, ultra-selective point sampling and remote short-range chemical sensors. This paper reports on the current development in infrared photonics that provides a pathway for QCL transmitter miniaturization. This research has produced infrared waveguide-based optical components in chalcogenide glass using both directlaser writing and holographic exposure techniques. We discuss here the design and fabrication concepts and capabilities required to produce integrated waveguides, waveguide couplers, and other photonic devices.

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Photoinduced Bragg gratings in As_2S_3 optical fibers

Cited by 65 publications

References 8 publications

Mechanical model of giant photoexpansion in a chalcogenide glass and the role of photofluidity

Mechanical model of giant photoexpansion in a chalcogenide glass and the role of photofluidity

Real-time analysis of a Bragg gratings formation in an As 2 S 3 channel waveguide

Advanced quantum cascade laser transmitter architectures and infrared photonics development

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