Low loss Type II regenerative Bragg gratings made with ultrafast radiation

Grobnic, Dan; Hnatovsky, Cyril; Mihailov, Stephen J.

doi:10.1364/oe.24.028704

Cited by 19 publications

(9 citation statements)

References 17 publications

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“…Another promising mechanism for reconfigurating phase‐changing nanophotonic structures is the glass relaxation and reflow under high‐temperature annealing driven by stress generation around the laser‐structured regions . Similar effects are anticipated in polymers with rubber–glass transitions where the strain defines the material response in an elastic or inelastic manner allowing for visco‐elastic flows to occur at high strains.…”

Section: Reversible Tuningmentioning

confidence: 86%

Light‐Induced Tuning and Reconfiguration of Nanophotonic Structures

Makarov

Zalogina

Tajik

et al. 2017

Laser & Photonics Reviews

179

115

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Interaction of light pulses of various durations and intensities with nanoscale photonic structures plays an important role in many applications of nanophotonics for high-density data storage, ultra-fast data processing, surface coloring and sensing. A design of optically tunable and reconfigurable structures made from different materials is based on many important physical effects and advances in material science, and it employs the resonant character of light interaction with nanostructures and strong field confinement at the nanoscale. Here we review the recent progress in physics of tunable and reconfigurable nanophotonic structures of different types. We start from low laser intensities that produce weak reversible changes in nanostructures, and then move to the discussion of non-reversible changes in photonic structures. We focus on three platforms based on metallic, dielectric and hybrid resonant photonic structures such as nanoantennas, nanoparticle oligomers and nanostructured metasurfaces. Main challenges and key advantages of each of the approaches focusing on applications in advanced photonic technologies are also discussed.

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Section: Reversible Tuningmentioning

confidence: 86%

Light‐Induced Tuning and Reconfiguration of Nanophotonic Structures

Makarov

Zalogina

Tajik

et al. 2017

Laser & Photonics Reviews

179

115

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“…The results from the previous section demonstrate that by blocking the π-shift one can fabricate quite symmetric Type II FBGs using a 1st-order mask, even when the inscription is performed at some distance from the mask, i.e., at L ~450 m. However, our previous results demonstrated that the long-term stability of Type II FBGs at high temperatures (i.e., ~1000°C) was improved when a 3rd-order mask was used for the inscription [64]. Taking into account the fact that this paper focuses on stable π-shifted Type II FBGs for extreme environments, the remainder is dedicated to studying the properties of gratings produced with a 3.21 mm pitch mask.…”

Section: Inscription Of π-Shifted Type II Fbgs In Smf-28 Fiber Using mentioning

confidence: 86%

High-temperature stable π-phase-shifted fiber Bragg gratings inscribed using infrared femtosecond pulses and a phase mask

Hnatovsky¹,

Grobnic²,

Mihailov³

2018

Opt. Express

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Type II π-phase-shifted Bragg gratings stable up to ~1000°C are written inside a standard single mode silica optical fiber (SMF-28) with infrared femtosecond pulses and a special phase mask. Inscription through the protective polyimide fiber coating is also demonstrated. The birefringence of the Bragg gratings and, as a result, the polarization dependence of their spectra are strongly affected by the femtosecond laser polarization. Using optimized writing conditions, the full width at half maximum of the π-phase-shifted passband feature can be ~30 pm in transmission, while the polarization-dependent shift of its central wavelength can be less than 8 pm, for a 7 mm long grating structure. This makes such gratings a unique tool for high-resolution measurements of temperature, load and vibration in extreme temperature environments.

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“…When the fibre is pre-annealed (before FBG writing) at high temperature (5 h at 1100°C), Type II fs-infrared (IR) FBGs are stable up to 1200°C during 20 h [60]. Following this view, regeneration can also improve fs-FBG performance to some extent [40,61]. In conventional single mode fibres (SMFs, Ge-doped silica glass), the point-to-point voids FBG (Type III fs-FBGs) have slight loss of reflectivity (typically 20% of its initial strength) in less than 20 h at 1000°C, before stabilizing [62].…”

Section: Femtosecond Fbgs (Type II and Iii Fbgs)mentioning

confidence: 99%

Overview of high temperature fibre Bragg gratings and potential improvement using highly doped aluminosilicate glass optical fibres

et al. 2019

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In this paper, various types of high temperature fibre Bragg gratings (FBGs) are reviewed, including recent results and advancements in the field. The main motivation of this review is to highlight the potential of fabricating thermally stable refractive index contrasts using femtosecond (fs) nearinfrared radiation in fibres fabricated with non-conventional techniques, such as the molten core method. As a demonstration of this, an yttrium aluminosilicate (YAS) core and pure silica cladding glass optical fibre is fabricated and investigated after being irradiated by an fs laser within the Type II regime. The familiar formation of nanogratings inside both core and cladding regions are identified and studied using birefringence measurements and scanning electron microscopy. The thermal stability of the Type II modifications is then investigated through isochronal annealing experiments (up to T=1100°C; time steps, Δt=30 min). For the YAS core composition, the measured birefringence does not decrease when tested up to 1000°C, while for the SiO 2 cladding under the same conditions, its value decreased by ∼30%. These results suggest that inscription of such 'Type II fs-IR' modifications in YAS fibres could be employed to make FBGs with high thermal stability. This opens the door toward the fabrication of a new range of 'FBG host fibres' suitable for ultra-high temperature operation. ORCID iDsMaxime Cavillon https:/ /orcid.org/0000-0003-1341-6294 Peter Dragic https:/ /orcid.org/0000-0002-4413-9130 Figure 5. Normalized retardance (averaged over the 0.1 to 1.0 μJ pulse energy range) as a function of temperature for YAG-derived fibre at the core center (YAS) and in the cladding (SiO 2 ), for both // and ⊥ configurations. The measurements were performed at room temperature.

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Low loss Type II regenerative Bragg gratings made with ultrafast radiation

Cited by 19 publications

References 17 publications

Light‐Induced Tuning and Reconfiguration of Nanophotonic Structures

Light‐Induced Tuning and Reconfiguration of Nanophotonic Structures

High-temperature stable π-phase-shifted fiber Bragg gratings inscribed using infrared femtosecond pulses and a phase mask

Overview of high temperature fibre Bragg gratings and potential improvement using highly doped aluminosilicate glass optical fibres

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