Drastic thermal effects reduction through distributed face cooling in a high power giant-pulse tiny laser

Zheng, Lihe; Kausas, Arvydas; Taira, Takunori

doi:10.1364/ome.7.003214

Cited by 47 publications

(7 citation statements)

References 12 publications

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“…The DFC chip underwent no crack at pump power of 86 W while Nd 3+ :YAG single chip suffered crystal crack under pump power around 54 W. Over megawatt peak power from DFC tiny integrated laser is demonstrated at 1 kHz with 3-pulse burst modes. It is concluded that DFC structure could relieve thermal effects as expected [8].…”

supporting

confidence: 56%

Feature issue introduction: shaping and patterning crystals for optics

Canalias¹,

Mirov²,

Taira³

et al. 2017

Opt. Mater. Express

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Shaping and patterning of bulk or thin layer crystals and ceramics are one of the new frontiers in the field of laser and nonlinear optics. These technical aspects are rarely published, but they are crucial for the fundamental studies as well as for technology and applications. This special issue features 15 articles that focus on the orienting, cutting, polishing, coating, bonding, writing guides, or poling crystals and ceramics for bulk-or micro-optics. We have here a corpus of contributions describing the techniques as well as the gain they bring in terms of functionality or performance of the fabricated components devoted to optics and photonics.

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supporting

confidence: 56%

Feature issue introduction: shaping and patterning crystals for optics

Canalias¹,

Mirov²,

Taira³

et al. 2017

Opt. Mater. Express

Self Cite

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“…In the Impulsing Paradigm Change through Disruptive Technologies Program (Im-PACT), "Ubiquitous Power Laser for Achieving a Safe, Secure, and Longevity Society" [24], led by the Japanese government's Cabinet Office, a high-power advanced microchip laser was developed. The objective was a pulse energy of 20 mJ, as shown.…”

Section: Laser Peening Processmentioning

confidence: 99%

Effect of Laser Peening with a Microchip Laser on Fatigue Life in Butt-Welded High-Strength Steel

2021

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Laser peening introduces compressive residual stresses on the surfaces of various materials and is effective in enhancing fatigue strength. Using a small microchip laser, with energies of 5, 10, and 15 mJ, the authors applied laser peening to the base material of an HT780 high-strength steel, and confirmed compressive residual stresses in the near-surface layer. Laser peening with a pulse energy of 15 mJ was then applied to fatigue samples of an HT780 butt-welded joint. It was confirmed that laser peening with the microchip laser prolonged the fatigue life of the welded joint samples to the same level as in previous studies with a conventional laser.

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“…Such a simple LPwC Considering such progress on the low-energy LPwC, the development of 20 mJ-class palmtopsized handheld lasers was initiated in 2014 in a five-year Japanese national program, ImPACT [17]. A near-infrared (λ = 1.06 μm), sub-nanosecond (<1 ns) and passively Q-switched Nd:YAG laser with a weight of less than 1 kg was developed in IMS (Institute for Molecular Science ) led by Prof. Taira [34,35], as shown in Figure 12. A concept of LPwC system with the handheld laser is illustrated in Figure 13.…”

Section: Palmtop-sized Handheld Laser Developmentmentioning

confidence: 99%

Quarter Century Development of Laser Peening without Coating

Sano

2020

Metals

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This article summarizes the development of laser peening without coating (LPwC) during the recent quarter century. In the mid-1990s, the study of LPwC was initiated in Japan. The objective at that time was to mitigate stress corrosion cracking (SCC) of structural components in operating nuclear power reactors (NPRs) by inducing compressive residual stresses (RSs) on the surface of susceptible components. Since the components in NPRs are radioactive and cooled underwater, full-remote operation must be attained by using lasers of water-penetrable wavelength without any surface preparation. Compressive RS was obtained on the top-surface by reducing pulse energy less than 300 mJ and pulse duration less than 10 ns, and increasing pulse density (number of pulses irradiated on unit area). Since 1999, LPwC has been applied in NPRs as preventive maintenance against SCC using frequency-doubled Q-switched Nd:YAG lasers (λ = 532 nm). To extend the applicability, fiber-delivery of intense laser pulses was developed in parallel and has been used in NPRs since 2002. Early first decade of the 2000s, the effect extending fatigue life was demonstrated even if LPwC increased surface roughness of the components. Several years ago, it was confirmed that 10 to 20 mJ pulse energy is enough to enhance fatigue properties of weld joints of a structural steel. Considering such advances, the development of 20 mJ-class palmtop-sized handheld lasers was initiated in 2014 in a five-year national program, ImPACT under the cabinet office of the Japanese government. Such efforts would pave further applications of LPwC, for example maintenance of infrastructure in the field, beyond the horizons of the present laser systems.

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Drastic thermal effects reduction through distributed face cooling in a high power giant-pulse tiny laser

Cited by 47 publications

References 12 publications

Feature issue introduction: shaping and patterning crystals for optics

Feature issue introduction: shaping and patterning crystals for optics

Effect of Laser Peening with a Microchip Laser on Fatigue Life in Butt-Welded High-Strength Steel

Quarter Century Development of Laser Peening without Coating

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