Dynamic analysis of materials processing with 5-kW single-mode fiber laser

Takubo, Yuya; Ikoma, Shinya; Uchiyama, Keisuke; Kusaka, Hiroyuki; Umeda, Yoshio; Kashiwagi, M.

doi:10.1117/12.2505991

Cited by 3 publications

(3 citation statements)

References 2 publications

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“…H IGH power ytterbium doped fiber laser has become the most popular laser source in metal cutting, metal welding and other material processing fields [1]. Single mode fiber lasers with excellent beam quality are expected to achieve high aspect ratio and ultrafast processing speed [2]. While the drawbacks of traditional optical transmission fibers such as nonlinear optical effects and the low material's laser induced damage threshold has hindered the further growing of the high output power [3].…”

Section: Introductionmentioning

confidence: 99%

“…Breaking this contradiction can further reduce the loss limit of NC-HCFs. And it is beneficial to many fiber lasers applications of high-energy single mode transmission [2]. The inhibited coupling waveguiding mechanism of NC-HCFs points out, the coupling between the core and cladding modes can increase the loss of the core modes, and the coupling is related to the mismatch of their effective indices and field overlap [17]- [20].…”

Section: Introductionmentioning

confidence: 99%

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A Negative-Curvature Hollow-Core Fiber Structure With Double Trigonal-Symmetrical Anti-Resonant Elements

et al. 2022

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We propose a novel negative-curvature hollow-core fiber structure with double trigonal-symmetrical anti-resonant elements implementing single-mode or polarization-maintaining transmission for high-power laser delivery in the 1 µm wavelength window. For the single-mode fiber, the single-mode performance with a higher-order modes extinction ratio (HOMER) as high as 4.65 * 10 4 is achieved, and it remains >1 * 10 4 with a large fault tolerance proportion of tubes size, which can increase the flexibility of fiber fabrication. For another polarization-maintaining fiber, an ultra-low confinement loss of 0.005 dB/m is obtained for polarization-maintaining transmission by optimizing the refractive index of the two transverse glass tubes, while the polarization extinction ratio and HOMER remain both >1 * 10 3 . This is the first birefringent negative-curvature hollow-core fiber with a loss below 0.01 dB/m in the 1 µm wavelength window.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Negative-Curvature Hollow-Core Fiber Structure With Double Trigonal-Symmetrical Anti-Resonant Elements

et al. 2022

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“…One of the key reliability factor of the high power fiber lasers has always been the thermal management, especially on the ever higher power pump diodes and the other optical components. There have been many innovative cold plate design to provide efficient cooling to these high power components 1,2,3,4 . However, there are still two realistic open issues: 1. the water chillers and fiber lasers today are working completely independent, instead of a close-loop actively-adjusting system which ensure the laser always working at the best design temperature for reliability and longevity; 2. the water contamination problem and thus reduced cooling performance associated with water chillers.…”

Section: Introductionmentioning

confidence: 99%

High efficiency active air cooled (AAC) 12kw fiber laser system

Meng,

Yang,

Zhang

et al. 2024

Components and Packaging for Laser Systems X

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12kw fiber laser has become the new industrial laser standard being widely used in sheet metal cutting, laser cladding, laser welding and many other industrial applications. The most common failure associated with such high power fiber laser is the thermally-induced component failure, including the laser chip failure resulting in power degradation, the high power pump diode failure from insufficient cooling, to fiber component failure from overheat, etc. Here we present an innovative Active Air Cooled 12kw fiber laser system with the build-in closed-loopcontrolled waterless cooling system, not only improve the component and the overall laser reliability but also improve the overall system electric-optical efficiency by as much as 30%.

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Thermocavitation: a mechanism to pulse fiber lasers

et al. 2021

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In this paper, we present a novel mechanism for the generation of laser pulses based on the phenomenon of thermocavitation. Thermocavitation bubbles were generated within a glass cuvette filled with copper nitrate dissolved in water, where the tip of an optical fiber was placed very close to the bubble generation region. Once the bubble is generated, it expands rapidly and the incoming laser light transmitted through the optical fiber is reflected at the vapor-solution interface and reflected back into the fiber, which is coupled to an erbium-doped fiber ring laser. Laser pulses were extracted from the ring cavity and detected by a fast photodetector, which corresponds to a single thermocavitation event, obtaining a pulse repetition rate from 118 Hz to 2 kHz at 1560 nm, with a pulse width ranging from 64 to 57 µs. The repetition rate can be controlled by adjusting the laser power to induce thermocavitation. To our knowledge, this novel mechanism of laser pulses has not been reported in the literature.

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Dynamic analysis of materials processing with 5-kW single-mode fiber laser

Cited by 3 publications

References 2 publications

A Negative-Curvature Hollow-Core Fiber Structure With Double Trigonal-Symmetrical Anti-Resonant Elements

A Negative-Curvature Hollow-Core Fiber Structure With Double Trigonal-Symmetrical Anti-Resonant Elements

High efficiency active air cooled (AAC) 12kw fiber laser system

Thermocavitation: a mechanism to pulse fiber lasers

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