YASUHIRO OKAMOTO

Last Updated :2025/07/18

Affiliations, Positions
Graduate School of Advanced Science and Engineering, Professor
E-mail
okahirohiroshima-u.ac.jp
Self-introduction
I am mainly conducting education and research works of laser material processing by the collaboration with companies and researchers both in Japan and overseas through various academic societies, for opening advanced production processes using high energy beam.

Basic Information

Educational Backgrounds

  • Okayama University, Graduate School of Engineering, Division of Mechanical Engineering, Japan, 1996/04, 1998/03
  • Okayama University, Faculty of Engineering, Department of Mechanical Engineering, Japan, 1992/04, 1996/03

Academic Degrees

  • Okayama University
  • Doctor of Engineering, The University of Osaka

In Charge of Primary Major Programs

  • Program of Material Processing

Research Fields

  • Engineering;Mechanical engineering;Production engineering / Processing studies
  • Engineering;Mechanical engineering;Materials / Mechanics of materials

Research Keywords

  • Laser Beam Machining
  • Material Processing
  • Electrical Discharge Machiring

Affiliated Academic Societies

  • Japan Welding Society
  • Smart Processing Society for Materials, Environment & Energy
  • Japan Society of Mechanical Engineers
  • Japan Society of Electrical-Machining Engineers
  • Laser Institute of America
  • The Laser Society of Japan
  • LASER PLATFORM ASSOCIATION
  • The Japan Society for Precision Engineering
  • Japan Laser Processing Society

Educational Activity

Course in Charge

  1. 2025, Liberal Arts Education Program1, 1Term, Introductory Seminar for First-Year Students
  2. 2025, Liberal Arts Education Program1, 1Term, Introductory Seminar for First-Year Students
  3. 2025, Undergraduate Education, 1Term, An Introduction to Engineering Materials
  4. 2025, Undergraduate Education, 4Term, Mechanical Materials II
  5. 2025, Graduate Education (Master's Program) , 3Term, Advanced in Composite Science and Engineering

Research Activities

Academic Papers

  1. Direct welding of silicon carbide and fused silica using femtosecond lasers: Effects of repetition rate and focal depth, Optics & Laser Technology, 184, 112489-112489, 202506
  2. Fundamental Study on Influence of Residual Stress Distribution on Fatigue Strength in ns Pulsed Laser Peening for Welded High-Strength Steel, Defect and Diffusion Forum, 441, 61-68, 20250326
  3. ★, High-quality welding of copper and aluminum by angled laser irradiation and insert metals, Journal of Laser Applications, 37(1), 12041:1-12041:8, 20250201
  4. A Comparison of Weldability and Mechanical Properties of Additive Manufactured and Bulk Ti6Al4V Alloy, Materials Design and Applications V. Advanced Structured Materials, 212, 69-79, 20241109
  5. Investigation of Effective Gas Shielding Method for a Wide-area in Vertical-position Laser Welding of Titanium, International Journal of Electrical Machining, 20-29, 202403
  6. Application of large-area electron beam irradiation to micro-edge filleting, Journal of Manufacturing Processes, 107, 65-73, 202312
  7. ★, Fiber laser cutting of steel plate by twin spot beam setting in scanning direction, Journal of Laser Applications, 35(4), 042049:1-042049:11, 20231018
  8. Fundamental study on high-quality welding of copper and aluminum by angled and superposed irradiation of blue and near-infrared lasers, Journal of Laser Applications, 35(4), 042005:1-042005:9, 20230906
  9. ★, Study on joint characteristics in laser butt welding of AMed and wrought Ti6Al4V plates, Welding in the World, 67(5), 1997-2005, 20230608
  10. Effect of scanning speed on molten metal behaviour under angled irradiation with a continuous-wave laser, Journal of Materials Processing Technology, 313, 117866-117866, 202304
  11. Fiber laser cutting of steel materials with twin spot beam-twin spot setting in kerf width direction, Journal of Laser Applications, 34, 042009-1-042009-7, 202209
  12. ★, High-quality Micro-shape Fabrication of Monocrystalline Diamond by Nanosecond Pulsed Laser and Acid Cleaning, International Journal of Extreme Manufacturing, 025301, 20220317
  13. Joint integrity evaluation of laser beam welded additive manufactured Ti6Al4V sheets, Scientific Reports, 12(12), 4602, 20220308
  14. Study on Laser Drilling Process of Solid Metal on Its Liquid, International Journal of Electrical Machining, 27, 35-39, 202203
  15. ★, Effects of superposition of 532 nm and 1064 nm wavelengths in copper micro-welding by pulsed Nd:YAG laser, Journal of Materials Processing Technology, 299, 117388-117388, 202201
  16. Formation and Its Mechanism of High-speed Micro-grooving on Metal Surface by Angled CW Laser Irradiation, Journal of Laser Micro/Nanoengineering, 16(2), 109-114, 202110
  17. Investigation and optimization of heat treatment process on tensile behaviour of Ti6Al4V alloy, Materialwissenschaft und Werkstofftechnik, 52(10), 1057-1063, 202110
  18. Laser Butt Welding of Thin Ti6Al4V Sheets: Effects of Welding Parameters, Journal of Composites Science, 5(9), 246-246, 20210914
  19. Influence of Free-electron Density Distribution on Mechanical Strength in Micro-welding of Glass by Picosecond Pulsed Laser, Journal of Smart Processing, 10(5), 294-300, 202109
  20. Investigation on reduction of dross height by analyzing beam intensity distribution in fiber laser cutting, Journal of Laser Applications, 33(4), 109-114, 202109
  21. Surface smoothing and repairing of additively manufactured metal products by large-area electron beam irradiation, CIRP Annals, 70(1), 143-146, 20210513
  22. Reliable and strong micro-welding of glass by ultrashort pulsed laser, Proceedings of SPIE, 11676, 116760P-1-116760P-7, 20210305
  23. Surface Profile Variation of Periodic Surface Nanostructures Produced by Ultrashort Pulsed Laser for Enhancement of Cell Orientation, International Journal of Electrical Machining, 26, 54-54, 202103
  24. Fundamental study on reduction of dross in fiber laser cutting of steel by shifting nozzle axis, Journal of Laser Applications, 33(1), 012022-012022, 202102
  25. High-Speed Micro-Grooving of Metal by Angled Irradiation of Single-Mode CW Fiber Laser, Applied Sciences, 10(23), 8333-1-8333-11, 20201124
  26. Effect of numerical aperture on molten area characteristics in micro-joining of glass by picosecond pulsed laser, Welding in the World, 64(6), 937-947, 202006
  27. Investigation on Surface Smoothing of Mold Material by Pulsed Laser Irradiation of 532 nm, Procedia CIRP, 95, 879-884, 202002
  28. Clarification of Temperature Distribution for Metals with Different Thermal Conductivity in Large-area Electron Beam Irradiation, Procedia CIRP, 95, 960-965, 202002
  29. High surface quality micro machining of monocrystalline diamond by picosecond pulsed laser, CIRP ANNALS-MANUFACTURING TECHNOLOGY, 68(1), 197-200, 201908
  30. Influence of Numerical Aperture on Molten Area Formation in Fusion Micro-Welding of Glass by Picosecond Pulsed Laser, APPLIED SCIENCES-BASEL, 9(7), 20190401
  31. Investigation of Separation Method for Gallium Nitride with Internal Modified Layer by Ultrashort Pulsed Laser, International Journal of Electrical Machining, 24, 21-26, 201903
  32. Influence of Surface State in Micro-Welding of Copper by Nd:YAG Laser, APPLIED SCIENCES-BASEL, 8(12), 201812
  33. Effects of polarization direction on removal characteristics of silver nanowire transparent conductive film by ultrashort pulsed laser, JOURNAL OF ADVANCED MECHANICAL DESIGN SYSTEMS AND MANUFACTURING, 12(5), JAMDSM0100-JAMDSM0100, 201810
  34. ★, High surface quality welding of aluminum using adjustable ring-mode fiber laser, Journal of Materials Processing Technology, 258(8), 180-188, 20180801
  35. Influence of Pulse Duration on Effective Energy on Material Removal in Micro-processing of Mild Steel by Several Hundred Nanoseconds Pulsed Laser, International Journal of Electrical Machining, 23, 38-44, 201803
  36. Effects of pulse duration on removal characteristics of silver nanowire transparent conductive film by nanosecond pulsed laser, JOURNAL OF MATERIALS PROCESSING TECHNOLOGY, 240(240), 255-261, 201702
  37. Influence of nozzle jet flushing on wire breakage in 1st-cut wire edm from start hole, Key Engineering Materials, 749, 130-135, 2017
  38. Fabrication of Multi-layered Artificial Skin Using Individual Digital Shade Guide, The Journal of Okayama Dental Society, 35(2), 53-57, 2017
  39. Study on Reduction of Discoloration Area in Micro-drilling of Multi-layered Artificial Skin by Picosecond Pulsed Laser, International Journal of Electrical Machining, 22(22), 8-13, 20170301
  40. Characteristics of spatter in micro-drilling of metal sheet by pulsed Nd: YAG laser, International Journal of Automation Technology, 10(6), 874-881, 20161101
  41. Mechanism of dynamic plasma motion in internal modification of glass by fs-laser pulses at high pulse repetition rate, OPTICS EXPRESS, 24(22), 25718-25731, 201610
  42. Effect of focusing condition on molten area characteristics in micro-welding of borosilicate glass by picosecond pulsed laser, APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING, 122(5), 492:1-492:11, 201605
  43. Thermo-Mechanical Analysis on Thermal Deformation of Thin Stainless Steel in Laser Micro-Welding, International Journal of Manufacturing, Materials, and Mechanical Engineering, 6(2), 51-66, 20160401
  44. Effect of wavelength and pulse duration on laser micro-welding of monocrystalline silicon and glass, APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING, 122(4), 400:1-400:7, 201604
  45. Investigation on Visibility of Drilled Hole in Laser Micro-drilling of Multi-layered Artificial Skin, International Journal of Electrical Machining, 21(21), 13-17, 20160301
  46. Influence of Pulse duration on Processing Characteristics of Transparent Conductive Film Containing Silver Nanowires by ns Pulsed Fiber Laser, Procedia CIRP, 42, 62-66, 2016
  47. Investigation of Shielding Gas Supplying Method in Vertical-position Laser Welding of Pure Titanium, Procedia CIRP, 42, 448-453, 2016
  48. High-speed Observation of Thin Wire Movement in Fine Wire EDM, Procedia CIRP, 42, 596-600, 2016
  49. Formation of periodic nanostructures with femtosecond laser for creation of new functional biomaterials, Procedia CIRP, 42, 57-61, 2016
  50. Improvement in Surface Characteristics by EDM with Chromium Powder Mixed Fluid, Procedia CIRP, 42, 231-235, 2016
  51. Effect of surrounding gas condition on surface integrity in micro-drilling of SiC by ns pulsed laser, APPLIED PHYSICS B-LASERS AND OPTICS, 119(3), 509-517, 201506
  52. High speed, high strength microwelding of Si/glass using ps-laser pulses, OPTICS EXPRESS, 23(3), 3427-3439, 201502
  53. Effect of Laser Beam Intensity Distribution in Removal Processing of ZnO Film by ns Pulsed Fiber Laser of Square Core, Journal of the Japan Society for Precision Engineering, 81(11), 1033-1038, 20151101
  54. Effects of focusing condition on micro-welding characteristics of borosilicate glass by picosecond pulsed laser, Key Engineering Materials, 656-657, 461-467, 2015
  55. Study on surface characteristics of EDMed surface with nickel powder mixed fluid, Key Engineering Materials, 656-657, 375-380, 2015
  56. Study on applicability of large-area EB irradiation to micro-deburring, Key Engineering Materials, 656-657, 369-374, 2015
  57. Effect of Tilting Jet Flushing Nozzle on Wire EDM Performance, International Journal of Electrical Machining, 20(20), 2-8, 20150301
  58. Influence of Bead Geometry on Weld Distortion in Laser Micro-welding of Thin Stainless Steel Sheet with High-speed Scanning, International Journal of Electrical Machining, 20(20), 9-15, 20150301
  59. Smart laser micro-welding of difficult-to-weld materials for electronic industry, Proc. of SPIE, LASER-BASED MICRO- AND NANOPROCESSING IX, 9351, 35102:1-35102:9, 2015
  60. Improvement of surface characteristics for long life of metal molds by large-area EB irradiation, JOURNAL OF MATERIALS PROCESSING TECHNOLOGY, 214(8), 1740-1748, 201408
  61. Formation of Internal Modified Line with High Aspect Ratio in Sapphire by Sub-nanosecond Pulsed Fiber Laser, JOURNAL OF LASER MICRO NANOENGINEERING, 9(1), 52-58, 201403
  62. Fundamental study on releasability of molded rubber from mold tool surface, INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY, 70(5-8), 1515-1521, 201402
  63. Development of simple power supplying system in multi-wire EDM slicing method, Proceedings of ASPE 2014 Annual Meeting, 251-254, 2014
  64. The Boundary of Key-hole Generation in Micro-welding of Aluminum Alloy by Pulsed Nd:YAG Laser with Superposition of Continuous Diode Laser, Journal of Japanese Society for Precision Engineering, 80(4), 419-424, 20140401
  65. Study on Possibility of Micro-deburring by Large-area Electron Beam Irradiation, International Journal of Electrical Machining, 19(19), 22-27, 2014
  66. Singulation Characteristics of Semiconductor Package Using Pulsed Fiber Laser and SHG:YAG Laser, International Journal of Electrical Machining, 19(19), 28-33, 2014
  67. Internal modification of glass by ultrashort laser pulse and its application to microwelding, APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING, 114(1), 187-208, 201401
  68. Micro-welding of High Thermal Conductive Material Aluminum-Graphite Composite by Pulsed Nd:YAG Laser, Journal of Laser Micro/Nanoengineering, 8(1), 90-96, 201302
  69. Neural network modeling for prediction of weld bead geometry in laser microwelding, Advances in Optical Technologies, 105-111, 2013
  70. Influence of weld bead geometry on thermal deformation in laser micro-welding, Procedia CIRP, 6, 492-497, 2013
  71. Fundamental study on multi-wire EDM slicing of SiC by wire electrode with track-shaped section, Procedia CIRP, 6, 232-237, 2013
  72. Fundamental Study on Sputter Deposition of Ceramic Film by Large-area EB Irradiation, Procedia CIRP, 6, 487-492, 2013
  73. Influence of Polarization Plane on Groove Shape in Scribing of Sapphire by THG:YAG Laser, International journal of electrical machining, 49-54, 2013
  74. Investigation of Wire Movement in Fine Wire EDM by High-speed Observation, International journal of electrical machining, 43-48, 2013
  75. Fundamental study on micro-deburring by large-area EB irradiation, Procedia CIRP, 5, 19-24, 2013
  76. ★, Evaluation of molten zone in micro-welding of glass by picosecond pulsed laser, Journal of Laser Micro Nanoengineering, 8(1), 65-69, 201301
  77. Fundamental study on sputter deposition of ceramic film by large-area electron beam irradiation, Procedia CIRP, 6, 486-491, 2013
  78. Direct micro-joining of flexible printed circuit and metal electrode by pulsed Nd:YAG laser, International Journal of Precision Engineering and Manufacturing, 13(3), 321-329, 201203
  79. Challenge to Development of Functional Multi-wire EDM Slicing Method using Wire Electrode with Track-shaped Section, Key Engineering Materials, 523-524, 287-292, 2012
  80. Novel Approach for Slicing of Silicon Carbide by Multi-wire EDM using Wire Electrode with Track-shaped Section, Proceedings of American Society for Precision Engineering 2012 Annual Meeting, 331-334, 2012
  81. Spatter Tracking in Laser Machining, Advances in Visual Computing. ISVC 2012. Lecture Notes in Computer Science, 7432, 626-635, 2012
  82. Optimization of Nozzle Flushing Method for Smooth Debris Exclusion in Wire EDM, Key Engineering Materials, 516, 73-78, 2012
  83. Micro-welding of Copper Plate by Frequency Doubled Diode Pumped Pulsed Nd:YAG Laser, Physics Procedia, 39, 577-584, 2012
  84. Velocity and Angle of Spatter in Fine Laser Processing, Physics Procedia, 39, 792-799, 2012
  85. THERMAL DEFORMATION IN MICRO-WELDING OF THIN STAINLESS STEEL SHEET BY SINGLE-MODE FIBER LASER, PROGRESS OF MACHINING TECHNOLOGY, 199-202, 2012
  86. HIGHT-SPEED OBSERVATION OF WIRE MOVEMENT IN FINE WIRE EDM, PROGRESS OF MACHINING TECHNOLOGY, 215-218, 2012
  87. SURFACE MODIFICATION OF CEMENTED TUNGSTEN CARBIDE WITH NICKEL BINDER BY LARGE-AREA ELECTRON BEAM, PROGRESS OF MACHINING TECHNOLOGY, 207-210, 2012
  88. Effects of Superposed Continuous Diode Laser on Welding Characteristics for Aluminum Alloy in Pulsed Nd:YAG Laser Welding, JOURNAL OF LASER MICRO NANOENGINEERING, 6(3), 225-230, 201112
  89. Characteristics of laser absorption and welding in FOTURAN glass by ultrashort laser pulses, OPTICS EXPRESS, 19(23), 22961-22973, 201111
  90. Experimental Investigation on Micro-welding of Thin Stainless Steel Sheet by Fiber Laser, American Journal of Engineering and Applied Sciences, 4(3), 306-312, 2011
  91. Surface modification of cemented carbide by EB polishing, CIRP ANNALS-MANUFACTURING TECHNOLOGY, 60(1), 575-578, 2011
  92. Numerical Simulation on Micro-welding of Thin Stainless Steel Sheet by Fiber Laser, International Journal of Electrical Machining, 9-14, 2011
  93. Novel fusion welding technology of glass using ultrashort pulse lasers, Physics Procedia, 5, 483-493, 2010
  94. Investigation on Welding Phenomenon for Aluminum Alloy by Superposition of Pulsed YAG Laser and Diode Laser, JOURNAL OF ADVANCED MECHANICAL DESIGN SYSTEMS AND MANUFACTURING, 4(5), 875-882, 2010
  95. Observation of Plasma Behavior in Micro-machining of Ceramics by Harmonics of Nd:YAG Laser, JOURNAL OF ADVANCED MECHANICAL DESIGN SYSTEMS AND MANUFACTURING, 4(5), 867-874, 2010
  96. High Quality Laser Dicing of Semiconductor Package with a Single-mode Q-switched Fiber Laser, International Journal of Electrical Machining, 33-38, 2010
  97. High Efficiency and High Quality Welding of Aluminum Alloy by Hybrid System Combined Nd:YAG Laser and Diode Laser, Journal of the Japan Society for Precision Engineering, 75(10), 1222-1226, 20091005
  98. Investigation of Surface Treatment Method by High-speed Scanning of Single-mode Fiber Laser with MOPA, PROGRESS OF MACHINING TECHNOLOGY, 407-408, 624-627, 2009
  99. ★, Fine Micro-welding of Thin Stainless Steel Sheet by High Speed Laser Scanning, JOURNAL OF LASER MICRO NANOENGINEERING, 3(2), 95-99, 200804
  100. Micro-welding of Stainless Steel Foil by High Speed Laser Scanning, The Paton Welding Journal, 158-162, 2008
  101. Development of Multi-wire EDM Slicing Method for Silicon Ingot, Proceedings of ASPE 2008 Annual Meetingnand the 12th ICPE, 503-533, 2008
  102. Cutting of Solid Type Molded Composite Materials by Q-switched Fiber Laser with High-Performance Nozzle, JOURNAL OF ADVANCED MECHANICAL DESIGN SYSTEMS AND MANUFACTURING, 2(4), 651-660, 2008
  103. Micro-Machining Characteristics of Ceramics by Harmonics of Nd:YAG laser, JOURNAL OF ADVANCED MECHANICAL DESIGN SYSTEMS AND MANUFACTURING, 2(4), 661-667, 2008
  104. Micro Cutting of Thin Copper Plate by Fiber Laser with Laval Nozzle, JOURNAL OF LASER MICRO NANOENGINEERING, 1(3), 243-246, 200612
  105. Cutting characteristics of thin copper plate by Q-switched single-mode fiber laser with high-performance nozzle, Progress of Machining Technology, 365-368, 2006
  106. Evaluation of Machining Characteristics of Aluminum Nitride by Harmonics of Nd: YAG Laser : Effects of Laser Beam Wavelength on Machining Characteristics, Journal of the Japan Society for Precision Engineering. Supplement. Contributed papers, 72(6), 725-729, 2006
  107. Microboring of Fine Powder Cemented Carbide Using Diode-pumped Q-switched YAG Laser, Journal of the Japan Society of Electrical-machining Engineers., 40(93), 21-28, 2006
  108. Effects of Laval Nozzle on Precision Micro Cutting of Thin Metal Plate by Pulsed YAG Laser, Journal of the Japan Society for Precision Engineering, 70(3), 433-437, 20040305
  109. Effects of Nozzle Shape on Precision Micro Cutting of Thin Metal Plate by Pulsed YAG Laser, Journal of the Japan Society for Precision Engineering, 70(2), 246-250, 20040205
  110. Laser Forming of Plastic by YAG Laser, Journal of High Temperature Society, 30(1), 47-54, 20040130
  111. Deformation characteristics of plastics in YAG laser forming, Proc. of SPIE, FIFTH INTERNATIONAL SYMPOSIUM ON LASER PRECISION MICROFABRICATION, 5662, 576-581, 2004
  112. Improving from Paperweight to Gyroscope in Manufacturing Practice, Journal of Japanese Society for Engineering Education, 51(5), 58-61, 20030920
  113. A New Slicing Method of Monocrystalline Silicon Ingot by Wire EDM, International Journal of Electrical Machining, 8, 21-26, 2003
  114. Precision Removal of ITO Film by LD pumped SHG YAG Laser, Journal of the Japan Society for Precision Engineering, 68(12), 1564-1569, 20021205
  115. Study on Laser Forming of Plastic by YAG Laser. Effect of Specimen Thickness on Deformation Characteristics, Journal of the Japan Society for Precision Engineering, 68(3), 466-471, 20020305
  116. Micro machining of ITO film by LD pumped SHG YAG laser, Proceedings of SPIE - The International Society for Optical Engineering, 4830, 40-45, 2002
  117. Laser Cutting of Semiconductor Elements, 7, 9-14, 2002
  118. Study on Precision Laser Forming of Plastic with YAG Laser, Journal of the Japan Society for Precision Engineering, 66(6), 891-895, 20000605
  119. Effect of nozzle shape on surface integrity in micro cutting with pulsed YAG laser, Proc. of SPIE, 1ST INTERNATIONAL SYMPOSIUM ON LASER PRECISION MICROFABRICATION, 4088, 291-294, 2000
  120. Study on Supplying Method of Assist Gas in Precision Cutting with Pulsed YAG Laser, Journal of the Japan Society for Precision Engineering, 65(10), 1471-1475, 19991005
  121. High efficiency fine boring of monocrystalline silicon ingot by electrical discharge machining, PRECISION ENGINEERING-JOURNAL OF THE AMERICAN SOCIETY FOR PRECISION ENGINEERING, 23(2), 126-133, 199904
  122. A new micro EDM technique for fine complicated hole with triangular section electrode, Journal of the Japan Society for Precision Engineering, 65(1), 239-242, 1998
  123. High Efficiency Penetration Boring of Single Crystalline Silicon Ingot by EDM, Journal of the Japan Society for Precision Engineering, 63(12), 1725-1729, 199712
  124. Fundamental Study on Electrical Discharge Machining of Single Crystalline Silicon, Journal of the Japan Society for Precision Engineering, 63(10), 1459-1463, 199710
  125. EDM Characteristics of CVD Carbon Electrode, Journal of The Japan Society of Electrical Machining Engineers, 30(65), 1-8, 199611

Publications such as books

  1. 2012, Nd YAG Laser "jointly worked", Nd YAG Laser "jointly worked", Scholarly Book, Joint work, eng

Invited Lecture, Oral Presentation, Poster Presentation

  1. Micro-welding of glass by multi-spot beam of picosecond pulsed laser, Yasuhiro Okamoto, 2025 Shanghai International Forum on Innovative Laser Application, 2025/03/09, With Invitation, English, Shanghai
  2. Reliable micro-welding of glass by picosecond pulsed laser with high pulse repetition rate, Yasuhiro Okamoto, Conference on Frontiers of Extreme Manufacturing, 2025/04/26, With Invitation, English, Ningbo, China
  3. Recent topics of laser applications in Japan and impact of beam intensity control and irradiation method, Yasuhiro Okamoto, 13th CIRP Conference on Photonic Technologies LANE2024, 2024/09/16, With Invitation, English, Bayerisches Laserzentrum GmbH, Fürth
  4. Micro-structuring Characteristics on Metal Surface by High-speed Scanning of Angled CW Laser Irradiation, Taiki Kawai, Riku Saitou; Atsuhiko Sakai; Yasuhiro Okamoto; Togo Shinonaga; Akira Okada, 25th International Symposium on Laser Precision Microfabrication – LPM2024, 2024/06/14, Without Invitation, English
  5. History of LPM, Yasuhiro Okamoto, 25th International Symposium on Laser Precision Microfabrication – LPM2024, 2024/06/11, With Invitation, English
  6. Stabilizing the absorption of laser energy in welding of copper, Yasuhiro Okamoto, 15th International Conference on Materials Processing and Characterization (ICMPC), 2023/09/06, Without Invitation, English, Newcastel
  7. Investigation on high-quality laser welding of copper and aluminum, Yasuhiro Okamoto, Yuki Yamada; Akihiro Ochi; Akira Okada; Takeshi Yamamura; Katsutoshi Nagasaki; Kazunobu Mameno; Norio Nishi, International Conference on Processing & Manufacuturing of Advanced Materials (THERMEC2023), 2023/07/04, With Invitation, English, Wein
  8. Investigation on Laser Welding of Copper and Aluminum by Irradiation from Copper-side, Yasuhiro Okamoto; Yuki Yamada; Akihiro Ochi; Takeshi Yamamura; Katsutoshi Nagasaki; Kazunobu Mameno; Norio Nishi; Akira Okada, Laser in Manufacturing 2023, 2023/06/28, With Invitation, English, WLT, Munich
  9. Recent topics of laser applications in Japan and high-quality Cu/Al laser welding, Yasuhiro Okamoto, 8th Industrial Laser Applications Symposium, ILAS 2023, 2023/03/22, With Invitation, English, AILU, Daventry, UK
  10. Stabilization of Fusion Micro-welding of Glass by Picosecond Pulsed Laser, Yasuhiro Okamoto, Yuta Ogino, Togo Shinonaga, Akira Okada, International Conference on Processing and Manufacturing of Advanced Materials (THERMEC '2018), 2018/07, With Invitation, English
  11. Basics and Advanced Applications of Laser Material Processing, Yasuhiro Okamoto, Special Open Seminar, African Union -african innovation - JKUAT AND PAUSTI Network Project, 2018/05, With Invitation, English
  12. Thought of Future Manufacturing (MONOZUKURI) -Laser Beam Processing-, Yasuhiro Okamoto, 2018 Sustainable Research and Innovation Conference, 2018/05, With Invitation, English

Awards

  1. 2024/09, Best Paper Award, The 5th International Conference on Machining, Material and Mechanical Technologies (IC3MT 2024)
  2. 2024/07, Best Author Award, International Journal of Extreme Manufacturing

Patented

  1. Patent, US11890691B2, 2024/02/26, Wire electric discharge machining device, and control method and control program therefor
  2. Patent, EP2674239B1, 2020/12/16, Laser Processing Method
  3. Patent, US9364910B2, 2016/08/22, Wire electrical discharge machining system, wire electrical discharge machining method, and workpiece
  4. Patent, US 9,375,799 B2, 2016/06/28, Multi-wire electrical discharge machining system, multi-wire electrical discharge machining apparatus, power supply device, multi-wire electrical discharge machining method, semiconductor substrate, solar cell substrate, substrate manufacturing system, and substrate manufacturing method
  5. Patent, US 8,933,367 B2, 2015/01/13, LASER PROCESSING METHOD

External Funds

Acceptance Results of Competitive Funds

  1. Grants-in-Aid for Scientific Research, Study on Improvement in Wire Electrical Discharge Machining Performance by Optimizing Flow of Dielectric Working Fluid, 2024/04/01, 2028/03/31
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  2. Grants-in-Aid for Scientific Research, Highly Efficient Surface Smoothing of AMed Metal Products by EB Polishing, 2024/04/01, 2027/03/31
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  3. Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B), High-reliable and high-quality welding of Cu and Al by superposition of angled near-infrared laser and elliptic blue laser, 2021/04, 2025/03
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  4. 2023/04, 2024/03
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  5. Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C), Highly Efficient Surface Smoothing by Clarification of EB Polishing Mechanism with Considering Flow of Material, 2021/04, 2024/03
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  6. Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B), Study on Formation of High-performance Metal Mold Surface by EDM with Hybrid Metal Powder Mixed Fluid, 2020/04, 2024/03
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  7. Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B), 2019/04, 2023/03
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  8. 2019/04, 2021/03
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  9. Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C), High quality laser processing with low visibility for flexible film with transparent conductive layer, 2018/04, 2021/03
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  10. Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B), Study on High-performance Surface Finishing by Large-area Electron Beam Irradiation, 2016/04, 2019/03
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  11. 2018/04, 2019/02
  12. Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C), Development of High-quality and High-reliable Laser Micro-welding of Difficult-to-weld Materials, 2015/04, 2018/03
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  13. Grants-in-Aid for Scientific Research, High Efficient Surface Finishing of Sintered Hard Materials for Metal Mold by Large-area Electron Beam Irradiation, 2012/04/01, 2015/03/31
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  14. Grants-in-Aid for Scientific Research Grant-in-Aid for Young Scientists (B), Direct bonding of semiconductor material and glass by ultra-short pulsed laser, 2012/04, 2015/03
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  15. Grants-in-Aid for Scientific Research Grant-in-Aid for Young Scientists (B), Development of Micro-welding by Ultra-short Pulsed Laser to Perform High-quality Joint of Glass, 2009, 2011
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  16. Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B), Study on Surface Finishing and Surface Modification of Metal Mold by Large-area Short-pulse Electron Beam, 2008, 2010
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  17. Grants-in-Aid for Scientific Research Grant-in-Aid for Young Scientists (B), Fine Laser Cutting of Thin Plate by High-performance Nozzle for Molten Material, 2007, 2008
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  18. Grants-in-Aid for Scientific Research Grant-in-Aid for Young Scientists (B), 2005, 2007
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  19. Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B), DEVELOPMENT OF HIGH EFFICIENCY SURFACE TREATMENT OF METAL MOLD BYLARGE-AREAELECTRON BEAM IRRADIATION, 2005, 2007
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  20. Grants-in-Aid for Scientific Research Grant-in-Aid for Young Scientists (B), 2002, 2004
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  21. Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B), High Efficiency and High Accuracy Multi-wire EDM Slicing Method of Monocrystalline Silicon Ingot, 2002, 2004
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  22. Grants-in-Aid for Scientific Research Grant-in-Aid for Encouragement of Young Scientists (A), 2000, 2001
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  23. Grants-in-Aid for Scientific Research Grant-in-Aid for Exploratory Research, 1999, 2001
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Social Activities

History as Committee Members

  1. Vice President, 2020/06, Japan Laser Processing Society
  2. Board member, 2014, LASER PLATFORM ASSOCIATION
  3. Senior Editor, Journal of Laser Applications, 2020/04, Laser Institute of America
  4. Board member, Chugoku-Shikoku branch, 2020/02, The Japan Society for Precision Engineering
  5. Editor, Journal of Laser Micro / Nanoengineering, 2017/04, Japan Laser Processing Society
  6. Board member, Chugoku branch, 2016/04, Japan Welding Society
  7. Board member, 2016/04, Assicuation for Advanced Machining Technologies
  8. Board member, 2007/04, 2020/05, Japan Laser Processing Society

Organizing Academic Conferences, etc.

  1. The 25th International Symposium on Laser Precision Microfabrication, LPM2024, Ggeneral chair, 2023/06, 2024/06
  2. The 9th International Congress on Laser Advanced Materials Processing LAMP2025, Ggeneral chair, 2024/06, 2025/06
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History as Peer Reviews of Academic Papers

  1. 2020, Precision Engineering, Others, Reviewer, 2
  2. 2023, Journal of Materials Processing Technology, Others, Reviewer, 1
  3. 2022, Materials_Science, Others, Reviewer, 1
  4. 2021, Mechanical Engineering Letters, Others, Reviewer, 2
  5. 2020, International Journal of Automation Technology, Others, Reviewer, 1
  6. 2024, Optics and Laser Technology, Others, Reviewer, 1
  7. 2022, Optics and Laser Technology, Others, Reviewer, 2
  8. 2024, Journal of Laser Applications, Others, Reivewer, 1
  9. 2023, Journal of Laser Applications, Others, Reivewer, 3
  10. 2022, Journal of Laser Applications, Others, Reviewer, 1
  11. 2021, Journal of Laser Applications, Others, Reviewer, 1
  12. 2020, Journal of Laser Applications, Others, Reivewer, 1