Flexible beam delivery of ultrafast laser through vacuum-pumped anti-resonant hollow-core fiber

Cai, Yiming; Mai, Yifan; Shen, Xiang; Shi, Jianhong; Zhu, Qiuguo; Li, Rong; Li, Jinyan; Li, Cheng; Yan, Dapeng; Xing, Yingbin

doi:10.3389/fphy.2023.1160287

Cited by 3 publications

(1 citation statement)

References 43 publications

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“…In the ref. [26], a 5-m vacuumed AR-HCF was used to determine the relationship between beam quality and bending diameter. As demonstrated in some research, filling inert gas or vacuuming the air in the core was an effective method to eliminate the nonlinear effects in the beam transmission [25].…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2023

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We demonstrate the damage-free delivery of nearly diffraction-limited picosecond laser pulses at 1064 nm with a maximum peak power of 3.5 MW in a 5 m air-filled anti-resonant hollow-core fiber (AR-HCF). In the air-filled AR-HCF, the transmission efficiency of picosecond pulses is degraded due to stimulated Raman scattering for the incident peak power above 3.59 MW. The temporal compression of pulses is also observed in the air-filled AR-HCF, where the self-phase modulation plays a key role in the anomalous dispersion region. By vacuuming the air in the core, a nearly constant coupling efficiency of 77% is achieved through the 5 m AR-HCF free of nonlinear effects, with M2 of the output beam less than 1.17.

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Section: Introductionmentioning

confidence: 99%

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

et al. 2023

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High-power polarization-maintaining LP₁₁-mode fiber laser based on long-period fiber grating for precise welding

Zhu,

Shi,

et al. 2024

Opt. Express

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An LP11-mode output all-fiber laser was presented, utilizing long-period fiber gratings (LPFGs) and polarization-maintaining optical fiber (PMF). The LPFG was designed and fabricated, achieving a 90.56% efficiency in LP01 to LP11 mode conversion. Furthermore, the transmission stability of LP11-mode in the PMF was also explored, with the spatial mode overlap ratio exceeding 0.95. Ultimately, the high-power polarization-maintaining (PM) fiber laser, capable of the LP11 mode output, was constructed, with the output power of 600 W and the beam quality M2 of 2.84. During the process of welding a thick Al-plate, the LP11 fiber laser exhibits a notable 1.88 times greater depth of fusion compared to the commercial single-mode fiber laser, when operating at the laser welding head speed of 100 mm/s. For applications demanding non-circular symmetric high-order modes, this research holds substantial potential for widespread adoption within the field of industrial processing.

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Anti-resonant hollow core fiber with excellent bending resistance in the visible spectral range

Wan,

Xia,

Wang

et al. 2024

Opt. Express

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The development of wideband guided hollow-core anti-resonant fiber (HC-ARF) that covers the sensitive range of the human eye's visible spectrum is progressing rapidly. However, achieving low-loss wideband transmission with a small bending radius remains a challenging issue to be addressed. In light of this, we propose a novel, to our knowledge, HC-ARF with a nested double-semi-elliptical cladding structure in the visible spectral region. By employing finite element method simulations, we investigate the confinement loss, bending loss, and single-mode performance of this fiber design. The result shows that the confinement loss of this new fiber exhibits below 10−5 dB·m-1 across almost the entire visible band range, with a minimum loss of 1.55 × 10−7 dB·m-1 achieved for λ = 650 nm. Furthermore, this fiber demonstrates excellent resistance to bending and can maintain an ultra-low bending loss as low as 3 × 10−7 dB·m-1 even under extreme bending conditions with a radius of only 3 cm. Notably, its 3-dB bending radius reaches just 3.5 cm for λ = 532 nm. Additionally, it exhibits outstanding single-mode conductivity under various bending scenarios and achieves a high extinction ratio of up to 104 for higher-order modes after parameter optimization for specific wavelengths.

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Flexible beam delivery of ultrafast laser through vacuum-pumped anti-resonant hollow-core fiber

Cited by 3 publications

References 43 publications

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

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

High-power polarization-maintaining LP₁₁-mode fiber laser based on long-period fiber grating for precise welding

Anti-resonant hollow core fiber with excellent bending resistance in the visible spectral range

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Flexible beam delivery of ultrafast laser through vacuum-pumped anti-resonant hollow-core fiber

Cited by 3 publications

References 43 publications

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

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

High-power polarization-maintaining LP11-mode fiber laser based on long-period fiber grating for precise welding

Anti-resonant hollow core fiber with excellent bending resistance in the visible spectral range

Contact Info

Product

Resources

About

High-power polarization-maintaining LP₁₁-mode fiber laser based on long-period fiber grating for precise welding