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Yasuhiro Okamoto
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Journal Articles

Fiber laser cutting of steel plate by twin spot beam setting in scanning direction

Yasuhiro Okamoto, Kota Morimoto, Naoki Kai, Akira Okada, Hiroaki Ishiguro, Ryohei Ito, Hiroshi Okawa
Journal: Journal of Laser Applications
J. Laser Appl. 35, 042049 (2023)
https://doi.org/10.2351/7.0001097
Published: October 2023
View article titled, Fiber laser cutting of steel plate by twin spot beam setting in scanning direction
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Journal Articles

Fundamental study on high-quality welding of copper and aluminum by angled and superposed irradiation of blue and near-infrared lasers

Yuki Yamada, Yasuhiro Okamoto, Akira Okada, Norio Nishi, Takeshi Yamamura, Katsutoshi Nagasaki, Kazunobu Mameno
Journal: Journal of Laser Applications
J. Laser Appl. 35, 042005 (2023)
https://doi.org/10.2351/7.0001096
Published: September 2023
View article titled, Fundamental study on high-quality welding of copper and aluminum by angled and superposed irradiation of blue and near-infrared lasers
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Journal Articles

Fiber laser cutting of steel materials with twin spot beam-twin spot setting in kerf width direction

Kota Morimoto, Atsushi Yagi, Naoto Kai, Yasuhiro Okamoto, Akira Okada, Hiroaki Ishiguro, Ryohei Ito, Akihiko Sugiyama, Hiroshi Okawa
Journal: Journal of Laser Applications
J. Laser Appl. 34, 042009 (2022)
https://doi.org/10.2351/7.0000740
Published: September 2022
View article titled, Fiber laser cutting of steel materials with twin spot beam-twin spot setting in kerf width direction
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Journal Articles

Investigation on reduction of dross height by analyzing beam intensity distribution in fiber laser cutting

Naoto Kai, Yasuhiro Okamoto, Akira Okada, Hiroaki Ishiguro, Ryohei Ito, Akihiko Sugiyama, Hiroshi Okawa, Rio Fujita
Journal: Journal of Laser Applications
J. Laser Appl. 33, 042008 (2021)
https://doi.org/10.2351/7.0000470
Published: September 2021
View article titled, Investigation on reduction of dross height by analyzing beam intensity distribution in fiber laser cutting
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Journal Articles

Fundamental study on reduction of dross in fiber laser cutting of steel by shifting nozzle axis

Atsushi Yagi, Seigo Kadonaga, Yasuhiro Okamoto, Hiroaki Ishiguro, Ryohei Ito, Akihiko Sugiyama, Hiroshi Okawa, Rio Fujita, Akira Okada
Journal: Journal of Laser Applications
J. Laser Appl. 33, 012022 (2021)
https://doi.org/10.2351/7.0000300
Published: December 2020
View article titled, Fundamental study on reduction of dross in fiber laser cutting of steel by shifting nozzle axis
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Proceedings Papers

Investigation of assist gas flow to improve slope angle of kerf in thick plate cutting of mild steel by fiber laser

Kyo Kitagawa, Yasuhiro Okamoto, Akira Okada, Hiroaki Ishiguro, Akihiko Sugiyama, Hironobu Miyoshi, Ryohei Ito
View Paper titled, Investigation of assist gas flow to improve slope angle of kerf in thick plate cutting of mild steel by fiber laser
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Proceedings Papers

Improvement of slope angle of kerf in thick plate cutting of mild steel by fiber laser

Kyo Kitagawa, Yasuhiro Okamoto, Akira Okada, Hiroaki Ishiguro, Akihiko Sugiyama, Hironobu Miyoshi, Ryohei Ito
View Paper titled, Improvement of slope angle of kerf in thick plate cutting of mild steel by fiber laser
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Proceedings Papers

Low-visibility processing of silver nanowire transparent conductive film by pulsed laser

Yasuhiro Okamoto, Norio Nishi, Masafumi Oshita, Takahiro Shimose, Togo Shinonaga, Akira Okada, Tomokazu Sakagawa
View Paper titled, Low-visibility processing of silver nanowire transparent conductive film by pulsed laser
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Proceedings Papers

Reduction of discoloration zone in micro-drilling of multi-layered artificial skin by picosecond pulsed laser

Yasuhiro Okamoto, Togo Shinonaga, Akira Eguchi, Kiichi Asako, Naoto Maeda, Akira Okada, Shogo Minagi
View Paper titled, Reduction of discoloration zone in micro-drilling of multi-layered artificial skin by picosecond pulsed laser
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Proceedings Papers

Control of surface profile in periodic nanostructures produced with ultrashort pulsed laser

Togo Shinonaga, Shouno Kinoshita, Yasuhiro Okamoto, Akira Okada
View Paper titled, Control of surface profile in periodic nanostructures produced with ultrashort pulsed laser
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Proceedings Papers

Effect of focusing condition on micro-welding characteristic of glass by ps pulsed laser

Yasuhiro Okamoto, Imaduddin Helmi Wan Nordin, Togo Shinonaga, Tomohiro Takekuni, Tomokazu Sakagawa, Akira Okada
View Paper titled, Effect of focusing condition on micro-welding characteristic of glass by ps pulsed laser
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Proceedings Papers

Improvement of gas shielding effect in vertical-position laser micro-welding of titanium alloy

Kento Shirasaya, Yasuhiro Okamoto, Kazuo Yokohara, Hikotaro Ochiai, Ryosuke Kimura, Shozo Ono, Masayuki Akase, Akira Okada
View Paper titled, Improvement of gas shielding effect in vertical-position laser micro-welding of titanium alloy
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Proceedings Papers

Characterization of absorptivity in micro-welding of copper by pulsed green Nd:YAG laser

Yasuhiro Okamoto, Shin-ichi Nakashiba, Takuya Wada, Tomokazu Sakagawa, Norio Nishi, Akira Okada
View Paper titled, Characterization of absorptivity in micro-welding of copper by pulsed green Nd:YAG laser
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Proceedings Papers

Singulation of semiconductor package by superposition of pulsed fiber laser and green YAG laser

Yasuhiro Okamoto, Kento Shirasaya, Ryoji Kitada, Akira Okada
View Paper titled, Singulation of semiconductor package by superposition of pulsed fiber laser and green YAG laser
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Proceedings Papers

Influence of surrounding gas type and pressure condition on micro-drilling of silicon carbide by harmonics of Nd:YAG laser

Yasuhiro Okamoto, Shin Urushibata, Akira Okada, Tomokazu Sakagawa, Shin-ichi Nakashiba
View Paper titled, Influence of surrounding gas type and pressure condition on micro-drilling of silicon carbide by harmonics of Nd:YAG laser
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Proceedings Papers

Singulation of sapphire substrate with high aspect ratio internal modification by sub-nanosecond pulsed fiber laser

Yasuhiro Okamoto, Kenta Takahashi, Akira Okada
View Paper titled, Singulation of sapphire substrate with high aspect ratio internal modification by sub-nanosecond pulsed fiber laser
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Proceedings Papers

Local laser joining of glass and silicon

Assi Hansen, Tiina Amberla, Yasuhiro Okamoto, Isamu Miyamoto
View Paper titled, Local laser joining of glass and silicon
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Proceedings Papers

Evaluation of damaged region at the groove edge of TCO film in pulsed fiber laser processing

Yasuhiro Okamoto, Naoya Takahashi, Shin-ichi Nakashiba, Tomokazu Sakagawa, Akira Okada
View Paper titled, Evaluation of damaged region at the groove edge of TCO film in pulsed fiber laser processing
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Proceedings Papers

Novel fusion welding technology of Si/glass using ultrashort laser pulses with high pulse repetition rates

Isamu Miyamoto, Yasuhiro Okamoto, Assi Hansen, Tiina Amberla, Jorma Vihinen, Jarno Kangastupa
View Paper titled, Novel fusion welding technology of Si/glass using ultrashort laser pulses with high pulse repetition rates
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Proceedings Papers

Welding characteristics of foturan glass using ultrashort laser pulses

Isamu Miyamoto, Kristian Cvecek, Yasuhiro Okamoto, Michael Schmidt, Henry Helvajian
View Paper titled, Welding characteristics of foturan glass using ultrashort laser pulses
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