Integration of Optical Fibers in Megajoule Class Laser Environments: Advantages and Limitations

Girard, Sabine; Ouerdane, Y.; Boukenter, Aziz; Marcandella, Claude; Bisutti, J.; Baggio, J.; Meunier, Jean-Pierre

doi:10.1109/tns.2012.2199130

Cited by 22 publications

(12 citation statements)

References 25 publications

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“…As a consequence, optical fibers are used for a variety of needs in fusion-devoted facilities such as the Laser Mégajoule in France and the National Ignition Facility in the USA. [6][7][8][9][10] For these infrastructures, the plasma and laser fiber-based diagnostics have then to survive a series of ignition shots that will be associated with a burst of x-rays, γ-rays, and 14 MeV neutrons. 11 Under transient radiation exposure, the waveguide transmission capability is strongly reduced by the radiation-induced attenuation (RIA) phenomenon as well as by parasitic light generation through radiation-induced emission (RIE).…”

Section: Introductionmentioning

confidence: 99%

Origins of radiation-induced attenuation in pure-silica-core and Ge-doped optical fibers under pulsed x-ray irradiation

Michele

Marcandella

Vidalot

et al. 2020

Journal of Applied Physics

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We investigated the nature, optical properties, and decay kinetics of point defects causing large transient attenuation increase observed in silica-based optical fibers exposed to short duration and high-dose rate x-ray pulses. The transient radiation-induced attenuation (RIA) spectra of pure-silica-core (PSC), Ge-doped, F-doped, and Ge + F-doped optical fibers (OFs) were acquired after the ionizing pulse in the spectral range of [∼0.8-∼3.2] eV (∼1500-∼380 nm), from a few ms to several minutes after the pulse, at both room temperature (RT) and liquid nitrogen temperature (LNT). Comparing the fiber behavior at both temperatures better highlights the thermally unstable point defects contribution to the RIA. The transient RIA origin and decay kinetics are discussed on the basis of already-known defects absorbing in the investigated spectral range. These measurements reveal the importance of intrinsic metastable defects such as self-trapped holes (STHs), not only for PSC and F-doped fibers but also for germanosilicate optical fibers as clearly evidenced by our LNT measurements. Furthermore, our results show that fluorine co-doping seems to decrease the RIA related to the strain-assisted STHs absorption bands in both types of optical fibers. Regarding Ge-doped glasses, besides a description of the defects responsible of the RIA, highlighting the STHs' role in their transient response, we provide a clear correlation between the GeX and GeY centers' kinetics. In conclusion, the presented results improve our understanding of the transient RIA origin in the ultraviolet and visible domains. The lack of knowledge about the defects causing the RIA in the near-infrared domain will require future studies.

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Section: Introductionmentioning

confidence: 99%

Origins of radiation-induced attenuation in pure-silica-core and Ge-doped optical fibers under pulsed x-ray irradiation

Michele

Marcandella

Vidalot

et al. 2020

Journal of Applied Physics

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“…of the radiation. In [192], it is shown that the most impacting factor is the nature of the dopants used to realize the refractive index profile. Indeed, to increase the refractive index, Ge, P or N dopants are used whereas to decrease it F or B dopants are used.…”

Section: Effects Of Radiation On Optical Fibersmentioning

confidence: 99%

“…The same kind of experiment [197], has Table 2. RIA sensitivity to pulsed and CW gamma radiation [192]. been done on a double walled pipeline but here the capillary tube with the fiber has been installed on the inner bottom of the outer tube and along the length of the tube.…”

Section: Distributed Temperature Measurementmentioning

confidence: 99%

Nuclear instrumentation and measurement: a review based on the ANIMMA conferences

Giot

Vermeeren

Lyoussi

et al. 2017

EPJ Nuclear Sci. Technol.

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Abstract. The ANIMMA conferences offer a unique opportunity to discover research carried out in all fields of nuclear measurements and instrumentation with applications extending from fundamental physics to fission and fusion reactors, medical imaging, environmental protection and homeland security. After four successful editions of the Conference, it was decided to prepare a review based to a large extent but not exclusively on the papers presented during the first four editions of the conference. This review is organized according to the measurement methodologies: neutronic, photonic, thermal, acoustic and optical measurements, as well as medical imaging and specific challenges linked to data acquisition and electronic hardening. The paper describes the main challenges justifying research in these different areas, and summarizes the recent progress reported. It offers researchers and engineers a way to quickly and efficiently access knowledge in highly specialized areas.

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“…[1,4,8] Because of all these qualities, fiber-based devices are also more and more implemented in radiation-rich environments, making mandatory to investigate the radiation impact on their transmission properties. [1,2,9,10] Today, new generations of OFs have to be evaluated under irradiation to assess their vulnerability, as the physics involved in the radiation response of this complex device remains not yet predictable. [1,2,5,10] Indeed, the radiation strongly affects the fiber optical properties through different phenomena.…”

Section: Introductionmentioning

confidence: 99%

Pulsed X‐Ray Radiation Response of Ultralow Loss Pure‐Silica‐Core Optical Fibers

Michele

Marcandella

Morana

et al. 2021

Physica Status Solidi (a)

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The transient radiation response from the visible to the infrared (IR) domains (400–2200 nm) of an ultralow loss pure‐silica‐core and fluorine‐doped single‐mode optical fiber (ULL‐SMF) exposed to a short (tens of ns) 1 MeV X‐ray pulse is investigated. Online (hundredths of millisecond time resolution) radiation‐induced attenuation (RIA) spectra measurements are performed at both room and liquid nitrogen temperatures (RT and LNT). The main goals are to assess the vulnerability of this class of fibers as well as to characterize the metastable defects recovering just after the shot and responsible for the RIA decay kinetics. Their identification relies on a Gaussian spectral decomposition exploiting the optical absorption bands characteristics of point defects already known in literature. By comparing the ULL‐SMF behaviors at the two temperatures, the RIA unstable contributions are highlighted from the visible to IR domains, in particular the ones that are bleached in a timescale faster than the time resolution of a few milliseconds at RT. The origin of the induced losses is discussed revealing the fundamental role of the self‐trapped holes as intrinsic metastable defects in the response of this class of pure‐silica‐core OF.

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Integration of Optical Fibers in Megajoule Class Laser Environments: Advantages and Limitations

Cited by 22 publications

References 25 publications

Origins of radiation-induced attenuation in pure-silica-core and Ge-doped optical fibers under pulsed x-ray irradiation

Origins of radiation-induced attenuation in pure-silica-core and Ge-doped optical fibers under pulsed x-ray irradiation

Nuclear instrumentation and measurement: a review based on the ANIMMA conferences

Pulsed X‐Ray Radiation Response of Ultralow Loss Pure‐Silica‐Core Optical Fibers

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