TY - GEN
T1 - Reliable and strong micro-welding of glass by ultrashort pulsed laser
AU - Okamoto, Yasuhiro
AU - Ouyang, Zhiyong
AU - Okada, Akira
N1 - Funding Information:
The research work covered in this paper was partly supported by Japanese Ministry of Education, Culture, Sports, Science and Technology, JSPS KAKEN Grand Number 24760107 and Amada Foundation AF-2018204. Authors would like to express their sincere thanks to Dr. Togo Shinonaga, Assistant Professor, Graduate School of Natural Science and Technology, Okayama University for his contribution to the measurement of Young’s modulus.
Publisher Copyright:
© 2021 SPIE. All rights reserved.
PY - 2021
Y1 - 2021
N2 - Ultrashort pulsed laser has been expected to be a powerful and reliable tool for micro-welding of glass. Picosecond pulsed laser with high pulse repetition rate leads to melting of glass at the vicinity of focal region by the heat accumulation, in which the absorption point of laser energy moves periodically in beam axis. Thus, the control of focusing situation in beam axis is very important to investigate the mechanical strength of weld part. In the microwelding of borosilicate glass by picosecond pulsed laser of 1064 nm, characteristics of molten area creation and weld joint were discussed. Numerical aperture (N.A.) greatly affects characteristics of molten area formation, and superior focusing characteristics, such as N.A. 0.65 enable a long region of high power density in beam axis, which can create a large molten area without cracks even under high energy condition. An appropriately large molten area inside glass has high mechanical strength, when continuous and large molten areas were formed. In addition, high density and large size of molten area without crack led to increasing Young's modulus, and uniform and high Young's modulus of molten area results in higher breaking stress.
AB - Ultrashort pulsed laser has been expected to be a powerful and reliable tool for micro-welding of glass. Picosecond pulsed laser with high pulse repetition rate leads to melting of glass at the vicinity of focal region by the heat accumulation, in which the absorption point of laser energy moves periodically in beam axis. Thus, the control of focusing situation in beam axis is very important to investigate the mechanical strength of weld part. In the microwelding of borosilicate glass by picosecond pulsed laser of 1064 nm, characteristics of molten area creation and weld joint were discussed. Numerical aperture (N.A.) greatly affects characteristics of molten area formation, and superior focusing characteristics, such as N.A. 0.65 enable a long region of high power density in beam axis, which can create a large molten area without cracks even under high energy condition. An appropriately large molten area inside glass has high mechanical strength, when continuous and large molten areas were formed. In addition, high density and large size of molten area without crack led to increasing Young's modulus, and uniform and high Young's modulus of molten area results in higher breaking stress.
KW - Glass
KW - Micro-welding
KW - Numerical aperture
KW - Picosecond pulsed laser
KW - Young's modulus
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U2 - 10.1117/12.2584895
DO - 10.1117/12.2584895
M3 - Conference contribution
AN - SCOPUS:85107178459
T3 - Proceedings of SPIE - The International Society for Optical Engineering
BT - Frontiers in Ultrafast Optics
A2 - Herman, Peter R.
A2 - Meunier, Michel
A2 - Osellame, Roberto
PB - SPIE
T2 - Frontiers in Ultrafast Optics: Biomedical, Scientific, and Industrial Applications XXI 2021
Y2 - 6 March 2021 through 11 March 2021
ER -