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Volume 45, Issue 9
Special Issue on High Brightness and High Efficient Next Generation Laser Processing Technology Development
Displaying 1-8 of 8 articles from this issue
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Special Issue on High Brightness and High Efficient Next Generation Laser Processing Technology Development
Special Issue
Laser Review
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Yohei KOBAYASHI2017 Volume 45 Issue 9 Pages 553-
Published: 2017
Released on J-STAGE: December 17, 2020
JOURNAL FREE ACCESSA national project for next generation lasers and laser processing has started in 2016. A laser processing technology is growing in the world since it will be a key technology for the industry 4.0. We aim to develop ultraviolet lasers and high-power lasers for cool and new processing.View full abstractDownload PDF (435K) -
Junichi NISHIMAE, Masashi YOSHIMURA, Yusuke MORI, Yosuke ORII2017 Volume 45 Issue 9 Pages 554-
Published: 2017
Released on J-STAGE: December 17, 2020
JOURNAL FREE ACCESSWe are summarizing the development states of CLBO nonlinear crystal, picosecond laser light source, and laser processing system for the development of high quality laser processing using 266 nm picosecond laser. In addition, we will introduce the development direction of the NEDO project. With the development of high quality, long life CLBO crystal and the development of picosecond laser using gain switched semiconductor laser as seed laser, it became possible to develop a practical high power 266 nm picosecond laser. In the NEDO project, we are aiming to develop a high quality laser processing system that can be introduced into actual production. Toward this goal, we will develop a high power 266 nm picosecond laser with an average output of 50 W combined with high speed and high precision beam delivery system.View full abstractDownload PDF (1762K) -
Toshiyuki KAWASHIMA, Takashi KURITA, Takashi SEKINE, Takeshi WATAR ...2017 Volume 45 Issue 9 Pages 560-
Published: 2017
Released on J-STAGE: December 17, 2020
JOURNAL FREE ACCESSWe started to develop a material processing system using high power pulsed laser. We believe that high pulse energy output from diode-pumped solid-state laser (DPSSL) is critical for the next generation material processing technologies. A conceptual design on 100 Joule class DPSSL is presented using a Yb:YAG ceramics amplifier configuration. We developed a novel high power laser-diode stack with 7.5- kW peak power for pumping the DPSSL. The industrial applications of high pulse energy laser are reviewed in the field of material processing. We demonstrate the potential for surface treatment application using high energy laser pulses and present a preliminarily test of laser shock peening for metal material.View full abstractDownload PDF (747K) -
Junji YUMOTO, Kenji TORIZUKA, Ryunosuke KURODA2017 Volume 45 Issue 9 Pages 565-
Published: 2017
Released on J-STAGE: December 17, 2020
JOURNAL FREE ACCESSThis paper discusses our activities regarding the development of a laser-manufacturing test bed and database for laser-material processing conducted under the NEDO (New Energy and Industrial Technology Development Organization) Project, which undertakes research and development of nextgeneration laser-processing technology. Since more than 30 years, research and development is being conducted on laser-material processing, and it has become one of the most precious technologies. However, laser-material processing is one of the most complex concepts, i.e., it is categorized as an open nonlinear system far from equilibrium. In this study, we elucidate the physics of light–matter interaction to realize the new laser-manufacturing world, and control and exploit the dynamics of materials’ response to laser irradiation. The results of this study will determine the optimal values of laser parameters such as wavelength, pulse width, and repetition rate. A test bed for laser-material processing is built to confirm the adaptability and usefulness of the newly developed laser system in actual operation environments.View full abstractDownload PDF (524K) -
Koji KAKIZAKI, Masakazu KOBAYASHI, Hiroaki OIZUMI, Toshio MIMURA, ...2017 Volume 45 Issue 9 Pages 571-
Published: 2017
Released on J-STAGE: December 17, 2020
JOURNAL FREE ACCESSLaser processing is required in an extremely short wavelength because getting high-power solid-state lasers is difficult below a wavelength of 200 nm. In an extremely short wavelength region, the energy from a single photon can match the bond energy levels of various carbon compounds and the band gaps of solid materials, enabling these compounds and solids to be processed directly by one or two photons. We developed a hybrid ArF laser, which combines a solid-state laser oscillator and an excimer laser amplifier. We achieved high light-harvesting efficiency and high coherence of a hybrid laser, which has an M2 value of 1.6 and an average power of 110 W with three-pass amplifications.View full abstractDownload PDF (959K) -
Masahiro TSUKAMOTO2017 Volume 45 Issue 9 Pages 576-
Published: 2017
Released on J-STAGE: December 17, 2020
JOURNAL FREE ACCESSAdditive manufacturing and the welding of copper materials are expected in various industries since their properties, including thermal and electrical conductivities, outperform other metals. An infrared (IR) laser is usually used for laser additive manufacturing and welding. However, it is difficult to perform additive manufacturing and copper welding because copper has high reflectivity at the IR laser wavelength. The copper absorptivity is increased as the light wavelength is decreased. In the wavelength range of 400 to 460 nm blue light, the extra comma really makes this sentence confusing. Isn’t this what you mean? The copper absorptance is much higher than that in the wavelength range of IR light. Therefore, a high-power blue diode laser is required. A 100 W blue diode laser has been developed using semiconductor laser devices with a 450 nm wavelength in a project promoted by NEDO. The blue diode laser has already been installed in a thermal welding system.View full abstractDownload PDF (836K)
Laser Original
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Yosuke ORII, Hisashi SAWADA, Daisuke OKUYAMA, Mieko YAMAGAKI, Hide ...2017 Volume 45 Issue 9 Pages 580-
Published: 2017
Released on J-STAGE: December 17, 2020
JOURNAL FREE ACCESSToward the development of a high-power deep-ultraviolet picosecond laser, we report the features of a tested laser system and the experimentally observed relation between the fundamental-wave light source and the thermal effects during deep-ultraviolet wavelength conversion. The laser is expected to be operational at 266 nm for about 2000 h based on lifetime tests of 300 h at an average output of 10 W, pulse width of 9.8 ps, and repetition frequency of 200 kHz.View full abstractDownload PDF (1277K)
Regular Paper
Laser Original
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Kiyotaka FUKAMI, Hiroyuki OHASHI, Masahiro NAKAMURA, Xin GAO2017 Volume 45 Issue 9 Pages 587-
Published: 2017
Released on J-STAGE: December 17, 2020
JOURNAL FREE ACCESSPassively Q-switched microchip lasers have attracted much attention recently, for application in fields including LiDAR and laser manufacturing. Recently, high-power single longitudinal- and transversemode microchip lasers have been used in the THz area. In the present paper, we report a passively Q-switched microchip laser amplifying system that uses a high-power fiber coupling QCW-LD stack as a pumping source. A maximum pulse energy of 34.5 mJ with 370 ps pulse width and a peak power of 93 MW with single longitudinal- and transverse-mode laser are achieved at 30-Hz repetitions, while the incident pump power is 310 mJ.View full abstractDownload PDF (1546K)
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