Development of a high-power blue laser (445  nm) for material processing

Wang, Hongze; Kawahito, Yousuke; Yoshida, Ryohei; Nakashima, Yuya; Shiokawa, Kunio

doi:10.1364/ol.42.002251

Cited by 87 publications

(21 citation statements)

References 23 publications

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“…In the research of Prasad et al [69], in order to maintain the necessary heat input, compared with additively manufactured aluminum, steel and titanium, they use the largest power (1 kw) and the smallest speed (0.1 m/min). Other researchers are developing SLM technologies for blue and red lasers, but not much research has been done on pure copper [70,71].…”

Section: Selective Laser Meltingmentioning

confidence: 99%

“…In the study by Trevisan et al [5], a laser power of 200 w was also used and the substrate was preheated at 100 • C. The finally formed parts with a relative density of 83% were obtained. In the research of Wang et al [70], a SLM device based on blue laser (445 nm) was developed for the first time. It was found that the absorptivity of the steel powder to the blue laser was 2.5 times than the laser of wavelength range is 1000-1100 nm.…”

Section: Forming Properties Of Parts Manufactured By Slmmentioning

confidence: 99%

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A Review on Additive Manufacturing of Pure Copper

et al. 2021

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With the development of the aerospace and automotive industries, high heat exchange efficiency is a challenge facing the development of various industries. Pure copper has excellent mechanical and physical properties, especially high thermal conductivity and electrical conductivity. These excellent properties make pure copper the material of choice for the manufacture of heat exchangers and other electrical components. However, the traditional processing method is difficult to achieve the production of pure copper complex parts, so the production of pure copper parts through additive manufacturing has become a problem that must be overcome in industrial development. In this article, we not only reviewed the current status of research on the structural design and preparation of complex pure copper parts by researchers using selective laser melting (SLM), selective electron beam melting (SEBM) and binder jetting (BJ) in recent years, but also reviewed the forming, physical properties and mechanical aspects of pure copper parts prepared by different additive manufacturing methods. Finally, the development trend of additive manufacturing of pure copper parts is also prospected.

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Section: Selective Laser Meltingmentioning

confidence: 99%

Section: Forming Properties Of Parts Manufactured By Slmmentioning

confidence: 99%

A Review on Additive Manufacturing of Pure Copper

et al. 2021

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“…The rate of absorption of this laser system supplied on steel was 2.75 times that of the system of single-mode fiber laser operated at 1070nm. The steel characteristics after laser irradiation are commonly estimated to validate the potential of the used high-power blue laser to process materials such as cladding and heat treatment [6]. Xuan et al, in 2018, showed the generation of the deep ultraviolet lasers using solid-state/fiber lasers to process the nonlinear fundamental frequency conversion.…”

Section: -Introductionmentioning

confidence: 99%

Second Harmonic Generation of 266 nm Laser Beam Using BBO Nonlinear Crystal

Khorsheed

Al-Obaidi

2021

eijs

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Second harmonic generation (SHG) is a phenomenon observed in nonlinear optics that leads to frequency duplication for a high intensity laser incident on nonlinear crystal using BBO crystal. The SHG yield is achieved when the photons interact with a nonlinear optical material and effectively combine to form new photons with double frequency, and therefore double energy and half wavelength. This paper is concerned with the establishment of an SHG experiment to govern the process of producing half-wavelength laser beam from the input one. The theoretical effort was extended to compute the efficiency by using MATLAB software based on mathematical relationships. The values of the conversion maximum efficiencies, which were computed as a function of the input and output powers of the theoretical computations, were 15.6% and 16% at input and output power values of 0.6 and 0.1, respectively. The experimental results of the laser source of 532nm wavelength (fundamental frequency was 0.563x1015s-1) gave a half wavelength of 266nm (double frequency was 1.126x1015s-1). The conversion efficiencies, computed as a function of the input and output powers of the experimental measurements, were 14.32% and 12.97%, respectively.

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“…As described in Smith's paper the quantum wells were distributed asymmetrically in a 4-3 configuration in the first two anti-nodes of the optical standing wave, resulting in laser emission at 672 nm with output power of 12.2 mW, limited by the available pump power of 500 mW [22]. Since this initial work the development and commercialization of multi-mode InGaN diode lasers has rapidly progressed, driven by numerous applications including material processing [26], communications [27] and lighting [28], such that low cost devices composed of multiple emitters mounted in TO-5 and TO-9 cans are now available with output powers of several W [29].…”

Section: Introductionmentioning

confidence: 99%

InGaN-diode-pumped AlGaInP VECSEL with sub-kHz linewidth at 689 nm

Moriya

Casula

Parrotta

et al. 2020

Frontiers in Optics / Laser Science

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We report the design, growth, and characterization of an AlGaInP-based VECSEL, designed to be optically-pumped with an inexpensive high power blue InGaN diode laser, for emission around 689 nm. Up to 140 mW output power is achieved in a circularly-symmetric single transverse (TEM 00 ) and single longitudinal mode, tunable from 683 to 693 nm. With intensity stabilization of the pump diode and frequency-stabilization of the VECSEL resonator to a reference cavity via the Pound-Drever-Hall technique, we measure the power spectral density of the VECSEL frequency noise, reporting sub-kHz linewidth at 689 nm. The VECSEL relative intensity noise (RIN) is <−130 dBc/Hz for all frequencies above 100 kHz. This compact laser system is suitable for use in quantum technologies, particularly those based on laser-cooled and trapped strontium atoms.

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Development of a high-power blue laser (445 nm) for material processing

Cited by 87 publications

References 23 publications

A Review on Additive Manufacturing of Pure Copper

A Review on Additive Manufacturing of Pure Copper

Second Harmonic Generation of 266 nm Laser Beam Using BBO Nonlinear Crystal

InGaN-diode-pumped AlGaInP VECSEL with sub-kHz linewidth at 689 nm

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