Hollow-core fibers with ultralow loss in the ultraviolet range and sub-thermodynamic equilibrium surface-roughness

Osório, Jonas H.; Amrani, Foued; Delahaye, Frédéric; Dhaybi, Ali; Vasko, Kostiantyn; Tessier, Gilles; Giovanardi, Fabio; Vincetti, Luca; Debord, Benoît; Gérôme, F.; Benabid, Fetah

doi:10.1364/cleo_si.2022.sw4k.6

Cited by 7 publications

(11 citation statements)

References 11 publications

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“…To extend the study of nonlinearity and power efficiency in the green power delivery using HCF technology, we modeled a lowerloss HC-ARF and simulated the spectral bandwidth broadening and output powers based on the similar fiber geometry used in this work but with the fiber loss scaled to 1.8 dB km −1 at 520 nm (minimum loss of 1.5 dB km −1 at 560 nm, based on the state-ofthe-art loss level achievable [11,14] ) and the similar sub-nanosecond pulses but with higher input peak power (up to 150 kW). To study spectral broadening, the spectral bandwidth Δ𝜆 is defined and calculated by integrating spectral power around both sides of the input wavelength (520 nm) after broadening that contains at least 80% of the total power.…”

Section: Nonlinear Investigation and Scalability Of Power Delivery In...mentioning

confidence: 99%

“…Hundreds of millions of kilometers of standard solid single-mode fiber (SMF) are installed each year to transmit relatively low power extending from the ultraviolet, through the visible and nearinfrared, and out even to the mid-infrared. [10][11][12][13][14][15] Power delivery systems on the scale of hundreds of meters have been successfully implemented in the near and mid-infrared laser wavelength region. [1,13,16] However, no long-range power delivery in the visible region has yet been demonstrated.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, the loss values achievable in such fibers are falling rapidly, with the very latest fiber designs and drawing methods offering substantially lower losses than conventional fibers across most of the optical spectrum, extending from the ultraviolet, through the visible and near‐infrared, and out even to the mid‐infrared. [ 10‐15 ] Power delivery systems on the scale of hundreds of meters have been successfully implemented in the near and mid‐infrared laser wavelength region. [ 1,13,16 ] However, no long‐range power delivery in the visible region has yet been demonstrated.…”

Section: Introductionmentioning

confidence: 99%

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Hollow‐Core Fiber: Breaking the Nonlinearity Limits of Silica Fiber in Long‐Distance Green Laser Pulse Delivery

Fu,

Davidson,

Mousavi

et al. 2024

Laser & Photonics Reviews

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Hollow‐core fiber (HCF), in which >99.99% of the light is guided in a central air (or vacuum) filled core, is a radically new fiber technology offering the potential to overcome the nonlinear limits associated with the delivery of high‐brightness laser pulses over long distances in conventional solid‐core fiber. Overcoming these limits is particularly challenging at visible wavelengths where the core sizes of single‐mode fibers (SMFs) are reduced. In this work, the delivery of near‐diffraction‐limited, kilowatt‐peak‐power, sub‐nanosecond laser pulses in the green wavelength range over hundred‐meter scale lengths of a hollow‐core anti‐resonant fiber (HC‐ARF) which offers broadband low‐loss guidance in the visible is experimentally demonstrated. Substantially reduced nonlinearity‐induced spectral broadening is observed relative to silica‐core SMF. The simulation further confirms that the broadening observed (in the HC‐ARF) is entirely due to the interaction of the light with the air in the core and thus can effectively be eliminated by evacuating the fiber. Moreover, access to lower‐loss is noted, and visible guiding HC‐ARFs (that are now becoming available) will improve the throughput efficiency and extend power delivery to kilometer distance scales. The results demonstrated here pave the way for future long‐distance HCF pulse delivery applications, such as remote industrial e‐mobility manufacturing.

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Section: Nonlinear Investigation and Scalability Of Power Delivery In...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Hollow‐Core Fiber: Breaking the Nonlinearity Limits of Silica Fiber in Long‐Distance Green Laser Pulse Delivery

Fu,

Davidson,

Mousavi

et al. 2024

Laser & Photonics Reviews

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“…Then, Yu et al reported a ARF with attenuation of 0.08 dB/m and 0.26 dB/m at 218 nm and 355 nm, respectively in 2017 [ 25 ]. In most recent work on UV HCFs, Osório et al reported a method to reduce the inner surface roughness of HCFs by improving the preparation process [ 26 ]. Their method can achieve a reduction in the root-mean-square of surface roughness from 0.40 nm to 0.15 nm, reducing the loss figure as low as 9.7 dB/km at 369 nm [ 26 ].…”

Section: Introductionmentioning

confidence: 99%

Hollow-core pear-shaped conjoined-tube fiber with low loss in the ultraviolet band

Cheng,

Pan,

Liu

et al. 2023

Heliyon

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“…The implication is that more complex designs which primarily further reduce the leakage loss at similar core sizes are not necessary for fibers operating in this region. Thus in principle, the simpler tubular designs can be optimized to provide the lowest loss possible in this spectral region (see for example [104]. Similarly, at wavelengths beyond about 2.5µm, the loss is dominated by IR absorption.…”

mentioning

confidence: 99%

Loss in hollow-core optical fibers: mechanisms, scaling rules, and limits

Fokoua¹,

Mousavi²,

Jasion³

et al. 2023

Adv. Opt. Photon.

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Over the past few years, progress in hollow-core optical fiber technology has reduced the attenuation of these fibers to levels comparable to those of all-solid silica-core single-mode fibers. The sustained pace of progress in the field has sparked renewed interest in the technology and created the expectation that it will one day enable realization of the most transparent light-propagating waveguides ever produced, across all spectral regions of interest. In this work we review and analyze the various physical mechanisms that drive attenuation in hollow-core optical fibers. We consider both the somewhat legacy hollow-core photonic bandgap technology as well as the more recent antiresonant hollow-core fibers. As both fiber types exploit different guidance mechanisms from that of conventional solid-core fibers to confine light to the central core, their attenuation is also dominated by a different set of physical processes, which we analyze here in detail. First, we discuss intrinsic loss mechanisms in perfect and idealized fibers. These include leakage loss, absorption, and scattering within the gas filling the core or from the glass microstructure surrounding it, and roughness scattering from the air–glass interfaces within the fibers. The latter contribution is analyzed rigorously, clarifying inaccuracies in the literature that often led to the use of inadequate scaling rules. We then explore the extrinsic contributions to loss and discuss the effect of random microbends as well as that of other perturbations and non-uniformities that may result from imperfections in the fabrication process. These effects impact the loss of the fiber predominantly by scattering light from the fundamental mode into lossier higher-order modes and cladding modes. Although these contributions have often been neglected, their role becomes increasingly important in the context of producing, one day, hollow-core fibers with sub-0.1-dB/km loss and a pure single-mode guidance. Finally, we present general scaling rules for all the loss mechanisms mentioned previously and combine them to examine the performance of recently reported fibers. We lay some general guidelines for the design of low-loss hollow-core fibers operating at different spectral regions and conclude the paper with a brief outlook on the future of this potentially transformative technology.

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Hollow-core fibers with ultralow loss in the ultraviolet range and sub-thermodynamic equilibrium surface-roughness

Abstract: We report on hollow-core fibers displaying rms core roughness under the surface capillary waves thermodynamic limit and record loss in the short-wavelength range (50.0dB/km at 290nm, 9.7dB/km at 369nm, 5.0dB/km at 480nm, 0.9dB/km at 558nm).

Cited by 7 publications

References 11 publications

Hollow‐Core Fiber: Breaking the Nonlinearity Limits of Silica Fiber in Long‐Distance Green Laser Pulse Delivery

Hollow‐Core Fiber: Breaking the Nonlinearity Limits of Silica Fiber in Long‐Distance Green Laser Pulse Delivery

Hollow-core pear-shaped conjoined-tube fiber with low loss in the ultraviolet band

Loss in hollow-core optical fibers: mechanisms, scaling rules, and limits

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