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REVIEW 3 major objections 5 minor 23 references

Flexible delivery of high-power picosecond laser in purely-single optical mode of anti-resonant hollow-core fiber for micromachining

T0 review · 3 major / 5 minor · reviewed 2026-08-09 · deepseek-v4-flash

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Pith's one-line read A hollow-core fiber engineered with a capillary-to-core ratio near 0.68 delivers 20 W picosecond pulses in a single mode and achieves micromachining quality matching a free-space beam

desk verdict Useful engineering demonstration of 20 W picosecond delivery through AR-HCF with micromachining quality matching free space, but the d/D causal claim is confounded and needs a direct mode-purity measurement. read the letter →

arxiv 2502.00353 v1 pith:HPJBYI2V submitted 2025-02-01 physics.optics

Xinshuo Chang , Qinan Jiang , Zhiyuan Huang , Jinyu Pan , Qingwei Zhang , Nan Li , Zhuozhao Luo , Ruochen Yin
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Wenbin He Jiapeng Huang Yuxin Leng Xin Jiang Shanglu Yang Meng Pang
This is my paper · ORCID
classification physics.optics
keywords anti-resonanthollow-corefiberpicosecondlaserdeliverymicromachininghigher-order-modesuppressiond/Dratiomodepuritypointingstabilityaluminumprocessing
verification ladder T0 review T1 audit T2 compute T3 formal

The pith

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The reading

This paper argues that the practical value of an anti-resonant hollow-core fiber for laser micromachining lies in its optical mode purity, not just its low loss. By choosing a capillary-to-core diameter ratio ($d/D$) of about 0.68, the fiber makes higher-order modes leak away much more strongly than the fundamental mode, so the output beam stays Gaussian-like even when the fiber is moved, bent, or swayed. The authors show that 3 m of this fiber can deliver 20 W average power of 1064 nm picosecond pulses without measurable pulse broadening or spectral change, and that single-shot and in-line cuts on aluminum are as consistent and straight as those made with a free-space beam. The paper concludes that such fiber delivery is ready for practical ultrafast micromachining equipment.

What carries the argument

The central object is the anti-resonant hollow-core fiber (AR-HCF), which guides light in an air core surrounded by thin glass capillaries acting as anti-resonant reflectors. Its key design parameter is the ratio $d/D$ of capillary inner diameter to core diameter. The argument runs through this ratio: at $d/D \approx 0.68$ the higher-order modes are phase-matched to leak into the cladding and experience much higher loss than the fundamental mode, so any energy that microbending couples into them is quickly stripped away. The $d/D \approx 0.5$ fiber lacks this discrimination, so bending converts fundamental-mode light into a fluctuating mixture of modes and the output beam profile wanders. This modal-filtering mechanism is what connects a fiber geometry choice to the straightness and consistency of the cuts.

What would settle it

Subject both fibers to identical programmed bends while measuring the output mode content, for instance with an $M^2$ scan or spatially resolved interference; if the $d/D \approx 0.5$ fiber under those bends shows the same mode purity and the same straight cuts, the paper's causal attribution to $d/D$ fails.

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Extended reading notes

Core claim

The central claim is that higher-order-mode suppression, engineered through the capillary-to-core ratio, decides manufacturing quality in fiber-delivered ultrafast machining. The authors compare two 3-m anti-resonant hollow-core fibers: AR-HCF1 with $d = 16.6$ µm, $D = 33$ µm ($d/D \approx 0.5$) and AR-HCF2 with $d = 19.9$ µm, $D = 29.2$ µm ($d/D \approx 0.68$). At about 20 W, both fibers show similar power stability (roughly 0.2% RMS over 30 minutes) and neither changes the pulse width or spectrum, but under movement and sway AR-HCF1 develops beam-profile distortion attributed to microbend coupling into higher-order modes, while AR-HCF2 holds a stable Gaussian-like profile because its higher-order modes are far more lossy. In single-shot tests on 2-mm aluminum at 60 and 80 µJ, the $d/D \approx 0.68$ fiber gives consistent craters across positions; in in-line processing at 1.5 MHz and about 13 µJ per pulse at 4 mm/s, its displacement degree is 2.38%, versus 2.12% for free space and 5.66% for the $d/D \approx 0.5$ fiber. The paper states this is the first demonstration that the transmitted optical-mode purity of an anti-resonant hollow-core fiber matters for micromachining quality.

Load-bearing premise

The conclusion that the $d/D \approx 0.68$ capillary-to-core ratio is what improves machining quality rests on comparing two fibers that also differ in capillary size, core size, and loss, without directly measuring how much higher-order-mode light each one carries.

Editorial extensions

If this is right

  • Three meters of the $d/D \approx 0.68$ fiber can carry 20 W of 1064 nm picosecond pulses with no measurable pulse broadening or spectral change, and its in-line cuts on aluminum are nearly as straight as free-space cuts (2.38% versus 2.12% displacement).
  • The fiber delivery system has better pointing stability than a 3-m free-space path: about 9.8 and 8.5 µrad in the two axes for the $d/D \approx 0.68$ fiber, versus 26.3 and 17.2 µrad for free space.
  • Mode purity, not low loss alone, is presented as the determinant of micromachining consistency: the $d/D \approx 0.5$ fiber has comparable loss but visibly worse cut quality when the cable moves.
  • The improved suppression works dynamically: the output beam of the $d/D \approx 0.68$ fiber stays stable while the fiber is oscillating, so manufacturing quality does not depend on keeping the cable perfectly still.
  • Replacing a rigid free-space beam line with this flexible 3-m fiber preserves manufacturing quality while adding layout flexibility and reducing maintenance, which the paper identifies as the route to practical ultrafast micromachining equipment.

Reading between the lines

Editorial extensions of the paper, not claims the author makes directly.

  • Beyond the paper: the same modal-filtering rule should transfer to other wavelengths and pulse regimes, so future delivery fibers for UV or mid-infrared ultrafast pulses could be specified by choosing $d/D$ for maximum fundamental-to-higher-order loss contrast rather than by empirical iteration.
  • Beyond the paper: the mechanism predicts a quantitative link between bend radius and output mode purity, so measuring mode-resolved content or $M^2$ versus bend radius would give a design curve for robot-arm and articulated-tool installations.
  • Beyond the paper: a practical extension would add mode-purity feedback, using the output beam shape to adjust launch alignment or fiber position in real time and keep cut quality stable as the cable flexes.
  • Beyond the paper: the causal story would be strengthened by a direct measurement of higher-order-mode content under identical bends, since the two fibers compared here differ in core size, capillary size, and loss as well as in $d/D$.
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Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, and a circularity audit.

Referee Report

3 major / 5 minor

Summary. The paper reports delivery of 20 W picosecond pulses at 1064 nm through a 3-m-long anti-resonant hollow-core fiber (AR-HCF) and compares two fiber designs (d/D ~0.5 and ~0.68) in terms of output beam stability, pointing stability, and micromachining results on aluminum sheets. The authors claim that the d/D~0.68 fiber suppresses higher-order modes better, leading to improved manufacturing quality comparable to a free-space delivery system, and they attribute this improvement to the d/D ratio.

Significance. If the central causal claim were firmly established, the paper would provide a useful design guideline for mode-pure AR-HCF delivery in ultrafast laser micromachining. The experimental work includes valuable engineering data: 20 W average power, <15 ps pulses, ~76% system transmission, ~0.2% RMS power stability over 30 minutes, pointing stability of a few to tens of microradians, and qualitative comparisons of single-shot and in-line machining. The paper is strengthened by the direct comparison of free-space, AR-HCF1, and AR-HCF2 systems and by repeated beam-profile recording during operation. However, the central mechanistic attribution to d/D is not yet supported by direct mode-content measurements, and the machining-quality quantification is based on single traces without repeats or error bars.

major comments (3)
  1. [Fiber parameters (after Fig. 1)] The central claim that the d/D ratio (~0.68 vs ~0.5) causes the improved higher-order-mode suppression is confounded. AR-HCF1 and AR-HCF2 differ not only in d/D but also in capillary diameter (16.6 vs 19.9 µm), core diameter (33 vs 29.2 µm), and measured loss (0.12 vs 0.10 dB/m). Moreover, AR-HCF2 is introduced with references [19,20], and reference [20] describes a double-clad single-ring hollow-core fiber with enhanced modal filtering; if the fiber used here is that double-clad design, the additional cladding architecture, not the d/D ratio alone, may be responsible for the mode purity. The paper reports no direct measurement of mode content or mode-resolved loss (e.g., S2 imaging, M2, or HOM-loss spectra), so the abstract's statement that d/D~0.68 'exhibits better capability of high-order-mode suppression' is not established by the presented data.
  2. [Figs. 2 and 3 (beam profiles and pointing stability)] The beam-profile degradation observed for AR-HCF1 under movement is attributed to micro-bending-induced coupling from the fundamental mode to high-order modes, and the stability of AR-HCF2 is attributed to higher loss of high-order modes [19,20]. However, CCD beam-profile stability alone cannot cleanly separate mode-content changes from beam-pointing wander, input-coupling variation, or mechanical movement of the output fiber end. The pointing-stability differences between AR-HCF1 and AR-HCF2 are modest (θx = 14.0 vs 9.8 µrad; θy = 9.9 vs 8.5 µrad), and no error bars or repeated measurements are reported. A direct mode-purity diagnostic (e.g., spatial-mode-resolved loss or M2 measurement under static and perturbed conditions) is needed to support the mode-suppression mechanism.
  3. [Fig. 5 and Supplement 1, Section 3] The quantitative support for improved machining quality rests on displacement degrees of 2.12%, 5.66%, and 2.38% for free-space, AR-HCF1, and AR-HCF2. These values come from a single processing trace per condition, with no repeats, no error bars, and no statistical test. The definition of displacement degree as the ratio of the standard deviation to the mean of vertical distances to a reference line is also sensitive to the choice of reference line and to whether distances are signed; for a nearly straight trace the mean can be near zero, making the ratio unstable. As it stands, the claim that AR-HCF2 yields machining quality 'almost the same' as free-space is qualitative, not quantitatively demonstrated.
minor comments (5)
  1. [Title] The title's 'purely-single optical mode' is stronger than the evidence provided; consider softening to 'improved mode purity' or add a direct single-mode measurement.
  2. [Supplement 1, Section 2] The beam-profile evolution panels in Fig. S2 are not time-stamped; specify the exact acquisition times and whether the fiber's oscillating amplitude and frequency were controlled during the measurements.
  3. [References [19,20]] Please clarify whether AR-HCF2 is the same fiber as in reference [20] or a separately drawn fiber with the same d/D ratio. If it is the same double-clad fiber, state this explicitly, since the double-clad architecture is a potential confound.
  4. [Fig. 4] The single-shot crater images in Fig. 4 would benefit from quantitative circularity metrics (e.g., aspect ratio or circularity index) with error bars over multiple shots.
  5. [Introduction, second paragraph] The phrase 'high-order-mode excitation due to the movement and sway' should specify that the excitation is inferred from beam-profile changes, not directly measured.

Circularity Check

0 steps flagged · score 0.0 of 10

No significant circularity; the experimental comparison is self-contained and does not reduce to its inputs.

full rationale

The paper reports a direct experimental comparison of two AR-HCF samples and a free-space system for picosecond laser micromachining. There is no derivation chain with fitted parameters that are then 'predicted': the beam profiles (Fig 3), pointing stabilities (Fig 2), single-shot spot morphologies (Fig 4), and in-line trace displacement degrees (Fig 5, Supplement S3) are independently measured outputs. The causal attribution of improved machining quality to higher-order-mode suppression uses refs [19,20], including the authors' own ref [20], to explain the mechanism, but the central empirical demonstration—AR-HCF2 preserving a Gaussian-like beam under fiber movement while AR-HCF1 degrades—is directly measured and does not depend on that citation for its evidentiary content. Concerns that the d/D comparison is confounded by differences in capillary diameter, core diameter, loss, or the double-clad architecture reported in ref [20] are experimental-design/correctness issues, not circularity: no quantity in the paper is defined in terms of the claim it supports, and no fitted value is renamed as a prediction. Hence no circular step can be exhibited.

Assumptions & free parameters 0 free parameters · 3 assumptions · 0 invented entities

This is an experimental comparison with no fitted parameters or invented entities. The central claim relies on three domain assumptions: that d/D is the only relevant fiber difference, that beam-profile and displacement metrics capture mode purity and quality, and that the higher-order-mode loss mechanism from prior literature applies to these fibers under bending.

assumptions (3)
  • domain assumption The d/D ratio is the controlling design parameter for higher-order-mode suppression, and other geometric or loss differences between the two fiber samples do not affect the comparison.
    The two fibers differ in d (16.6 vs 19.9 µm), D (33 vs 29.2 µm), and loss (0.12 vs 0.10 dB/m); the paper's causal story isolates d/D without a controlled scan or direct mode-content measurement. See Fig. 1 inset and loss text.
  • domain assumption CCD beam-profile stability and the displacement-degree metric are adequate proxies for mode purity and micromachining quality.
    No M2, S2, or modal decomposition is reported, and displacement degree is a single value per condition with no uncertainty; see Supplement 1, section 3.
  • domain assumption Beam degradation in AR-HCF1 under movement is caused by fundamental-to-higher-order-mode coupling whose loss contrast is described by refs [19,20].
    The mechanism is cited from prior work rather than measured here; the paper uses it to explain Figs. 3 and 5.

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Cite this review

Pith. "Pith review of Flexible delivery of high-power picosecond laser in purely-single optical mode of anti-resonant hollow-core fiber for micromachining." pith.science (2026). https://pith.science/paper/HPJBYI2V

@misc{pith2026250200353,
  author       = {Pith},
  title        = {Pith review of: Flexible delivery of high-power picosecond laser in purely-single optical mode of anti-resonant hollow-core fiber for micromachining},
  year         = {2026},
  howpublished = {\url{https://pith.science/paper/HPJBYI2V}},
  note         = {Machine review of arXiv:2502.00353}
}
read the original abstract

We present the flexible delivery of picosecond laser pulses with up to 20 W average power over a 3-m-long sample of anti-resonant hollow-core fiber (AR-HCF) for laser micromachining applications. Our experiments highlight the importance of optical mode purity of the AR-HCF for the manufacturing precision. We demonstrate that compared with an AR-HCF sample with a capillary to core (d/D) ratio of ~0.5, the AR-HCF with a d/D ratio of ~0.68 exhibits better capability of high-order-mode suppression, giving rise to improved micromachining quality. Moreover, the AR-HCF delivery system exhibits better pointing stability and set-up flexibility than the free-space beam delivery system. These results pave the way to practical applications of AR-HCF in developing advanced equipment for ultrafast laser micromachining.

Figures

Figures reproduced from arXiv: 2502.00353 by the authors.

Figure 1
Figure 1. Experimental set-up. M1-M4 are optical reflectors with a [PITH_FULL_IMAGE:figures/full_fig_p002_1.png] view at source ↗
Figure 2
Figure 2. The power stability (a) and pointing stability (b) of free-space [PITH_FULL_IMAGE:figures/full_fig_p002_2.png] view at source ↗
Figure 4
Figure 4. Single-shot processing results on the surfaces of aluminum sheets [PITH_FULL_IMAGE:figures/full_fig_p003_4.png] view at source ↗
Figures from the paper (1 more)
Figure 5
Figure 5. Figure 5: In-line processing results on the surfaces of aluminum sheets [PITH_FULL_IMAGE:figures/full_fig_p004_5.png]

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Reference graph

Works this paper leans on

23 extracted references · 23 canonical work pages

  1. [20]

    Ultrahigh Transverse Mode Purity by Enhanced Modal Filtering in Double-Clad Single-Ring Hollow-Core Photonic Crystal Fiber,

    Z. Luo, J. Huang, Y. Zheng, R. Yin, L. Zhang, X. Jiang, and M. Pang, “Ultrahigh Transverse Mode Purity by Enhanced Modal Filtering in Double-Clad Single-Ring Hollow-Core Photonic Crystal Fiber,” Laser Photonics Rev. 18(6), 2301111 (2024). 1 Flexible delivery of high-power picosecond laser in purely-single optical mode of anti-resonant hollow-core fiber fo...

    work page 2024

  2. [1]

    Deep and high precision cutting of alumina ceramics by picosecond laser,

    C. Beausoleil, H. Yazdani Sarvestani, Z. Katz, J. Gholipour, and B. Ashrafi, “Deep and high precision cutting of alumina ceramics by picosecond laser,” Ceram. Int. 46(10), 15285–15296 (2020)

    work page 2020

  3. [2]

    Picosecond laser seal welding of perovskite films,

    H. Chen, Y. L. Xie, J. Duan, W. Xiong, and L. M. Deng, “Picosecond laser seal welding of perovskite films,” Opt. Laser Technol. 140, 107083 (2021)

    work page 2021

  4. [3]

    Optimized surface treatment of aerospace composites using a picosecond laser,

    F. L. Palmieri, R. I. Ledesma, J. G. Dennie, T. J. Kramer, Y. Lin, J. W. Hopkins, C. J. Wohl, and J. W. Connell, “Optimized surface treatment of aerospace composites using a picosecond laser,” Compos. Part B-Eng. 175, 107155 (2019)

    work page 2019

  5. [4]

    Targeted transfection by femtosecond laser,

    U. K. Tirlapur and K. König, “Targeted transfection by femtosecond laser,” Nature 418, 290–291 (2002)

    work page 2002

  6. [5]

    Two-photon fabrication,

    M. Farsari and B. N. Chichkov, “Two-photon fabrication,” Nat. Photonics 3, 450–452 (2009)

    work page 2009

  7. [6]

    White- light femtosecond Lidar at 100 TW power level,

    M. Petrarca, S. Henin, N. Berti, M. Matthews, J. Chagas, J. Kasparian, J.-P. Wolf, G. Gatti, G. Di Pirro, M.-P. Anania, M. Ferrario, and A. Ghigo, “White- light femtosecond Lidar at 100 TW power level,” Appl. Phys. B 114, 319– 325 (2014)

    work page 2014

  8. [7]

    Kilowatt-average-power single-mode laser light transmission over kilometre-scale hollow-core fibre,

    H. C. H. Mulvad, S. Abokhamis Mousavi, V. Zuba, L. Xu, H. Sakr, T. D. Bradley, J. R. Hayes, G. T. Jasion, E. Numkam Fokoua, A. Taranta, S.-U. Alam, D. J. Richardson, and F. Poletti, “Kilowatt-average-power single-mode laser light transmission over kilometre-scale hollow-core fibre,” Nat. Photonics 16, 448–453 (2022)

    work page 2022

Show all 23 references
  1. [8]

    High-Efficiency Distortion-Free Delivery of 3 kW Continuous-Wave Laser Using Low-Loss Multi-Mode Nested Hollow-Core Anti-Resonant Fiber,

    J. Y. Yao, X. Zhang, B. Li, B. B. Wang, D. C. Jin, Y. F. Duan, J. Y. Zhao, and P. Wang, “High-Efficiency Distortion-Free Delivery of 3 kW Continuous-Wave Laser Using Low-Loss Multi-Mode Nested Hollow-Core Anti-Resonant Fiber,” J. Lightwave Technol. 42(16), 5710 (2024)

    2024

  2. [9]

    Attenuation limit of silica-based hollow-core fiber at mid-IR wavelengths,

    F. Yu, P. Song, D. K. Wu, T. Birks, D. Bird, and J. Knight, “Attenuation limit of silica-based hollow-core fiber at mid-IR wavelengths,” APL Photonics 4(8), 080803 (2019)

    2019

  3. [10]

    Low- loss multi-mode anti-resonant hollow-core fibers,

    D. K. Wu, F. Yu, C. Wu, M. Zhao, J. H. Zheng, L. L. Hu, and J. Knight, “Low- loss multi-mode anti-resonant hollow-core fibers,” Opt. Express 31(13), 21870–21880 (2023)

    2023

  4. [11]

    Broadband Dispersive-Wave Emission Coupled with Two-Stage Soliton Self- Compression in Gas-Filled Anti-Resonant Hollow-Core Fibers,

    J. Y. Pan, Z. Y. Huang, Y. F. Chen, Z. Z. Luo, F. Yu, D. K. Wu, T. D. Chen, D. H. Liu, Y. Yu, W. B. He, X. Jiang, M. Pang, Y. X. Leng, and R. X. Li, “Broadband Dispersive-Wave Emission Coupled with Two-Stage Soliton Self- Compression in Gas-Filled Anti-Resonant Hollow-Core Fib...

    2024

  5. [12]

    Spectral Bandwidth Tuning of Photoionization-Induced Blue-Shifted Solitons in gas-Filled Hollow-Core Anti-Resonant Fibers,

    D. H. Liu, Z. Y. Huang, J. Y. Pan, T. D. Chen, Y. Yu, X. S. Chang, W. B. He, X. Jiang, M. Pang, Y. X. Leng, and R. X. Li, “Spectral Bandwidth Tuning of Photoionization-Induced Blue-Shifted Solitons in gas-Filled Hollow-Core Anti-Resonant Fibers,” IEEE J. Sel. Top. Quant. 30(6)...

    2024

  6. [13]

    Distribution of telecom entangled photons through a 7.7 km antiresonant hollow-core fiber,

    M. Antesberger, C. M. D. Richter, F. Poletti, R. Slavík, P. Petropoulos, H. Hübel, A. Trenti, P. Walther, and L. A. Rozema, “Distribution of telecom entangled photons through a 7.7 km antiresonant hollow-core fiber,” Optica Quant. 2(3), 173–180 (2024)

    2024

  7. [14]

    Integration of an anti-resonant hollow-core fiber with a multimode Yb-doped fiber for high power near-diffraction-limited laser operation,

    H. Z. Li, C. Goel, J. C. Zang, S. Raghuraman, S. X. Chen, M. R. A. Hassan, W. Chang, and S. Yoo, “Integration of an anti-resonant hollow-core fiber with a multimode Yb-doped fiber for high power near-diffraction-limited laser operation,” Opt. Express 30(5), 7928–7937 (2022)

    2022

  8. [15]

    Highly stable, flexible delivery of microjoule-level ultrafast pulses in vacuumized anti-resonant hollow-core fibers for active synchronization,

    C. C. Yan, H. Y. Li, Z. Y. Huang, X. L. Wang, D. H. Liu, X. Y. Liu, J. Y. Pan, Z. Z. Luo, F. Yang, Y. Zheng, R. C. Yin, H. H. Yu, Y. X. Leng, L. W. Song, M. Pang, and X. Jiang, “Highly stable, flexible delivery of microjoule-level ultrafast pulses in vacuumized anti-resonant h...

    2023

  9. [16]

    On-target delivery of intense ultrafast laser pulses through hollow-core anti-resonant fibers,

    A. Lekosiotis, F. Belli, C. Brahms, M. Sabbah, H. Sakr, I. A. Davidson, F. Poletti, and J. C. Travers, “On-target delivery of intense ultrafast laser pulses through hollow-core anti-resonant fibers,” Opt. Express 31(19), 30227– 30238 (2023)

    2023

  10. [17]

    Hollow-core fibers for high power pulse delivery,

    M. Michieletto, J. K. Lyngsø, C. Jakobsen, J. Lægsgaard, O. Bang, and T. T. Alkeskjold, “Hollow-core fibers for high power pulse delivery,” Opt. Express 24(7), 7103–7119 (2016)

    2016

  11. [18]

    Delivery of Nearly Diffraction-Limited Picosecond Laser Pulses in the Air-Filled Anti- Resonant Hollow-Core Fiber at 1 μm Wavelength,

    L. Liang, J. Guan, X. Zhu, Y. Wang, D. Wu, F. Yu, and Y. Han, “Delivery of Nearly Diffraction-Limited Picosecond Laser Pulses in the Air-Filled Anti- Resonant Hollow-Core Fiber at 1 μm Wavelength,” Photonics 10(4), 416 (2023)

    2023

  12. [19]

    Broadband robustly single-mode hollow-core PCF by resonant filtering of higher-order modes,

    P. Uebel, M. C. Günendi, M. H. Frosz, G. Ahmed, N. N. Edavalath, J. Ménard, and P. St. J. Russell, “Broadband robustly single-mode hollow-core PCF by resonant filtering of higher-order modes,” Opt. Lett. 41(9), 1961–1964 (2016)

    2016

  13. [21]

    The measured loss of the anti-resonant hollow-core fiber (AR-HCF) The measured loss of the AR-HCF was obtained using the cut-back method, and the measurement results were plotted in Fig. S1. Figures S1(a) and S1(b) correspond to the fiber losses of AR-HCF1 and AR-HCF2, respect...

  14. [22]

    Evolution of beam profiles at output ports of three laser delivery systems in static and oscillating states Figures S2(a) and S2(b) present the evolution of beam profiles measured at 20-second intervals from the output ports of three laser delivery systems (including free spac...

  15. [23]

    Figure S3 exhibits the in-line processing 4 result on the surfaces of aluminum sheet using ~20 W picosecond laser beams delivered over 3- m-long AR-HCF2

    Estimation of displacement degree In order to quantitatively evaluate the quality of the in-line processing, we estimated the displacement degree of these in-line processing results. Figure S3 exhibits the in-line processing 4 result on the surfaces of aluminum sheet using ~20...

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Reviewed August 9, 2026 · model on record in the stance chip above.