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Effect of focusing condition on molten area characteristics in micro-welding of borosilicate glass by picosecond pulsed laser

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Abstract

The characteristics of the molten area are attributed not only by laser energy condition but also the focusing condition. In this study, a picosecond pulsed laser of 1064 nm in wavelength and 12.5 ps in pulse duration was used as a laser source for joining glass material. Influence of focusing condition on micro-welding of glasses was experimentally investigated by using an objective lens with and without spherical aberration correction, and its molten area was characterized. The usage of objective lens with spherical aberration correction led to a larger molten area inside the bulk material of glass even under the same pulse energy, which related to the efficient micro-welding of glass materials. In addition, an optical system with the spherical aberration correction led to a stable absorption of laser energy inside the bulk glass material, stabilizing the shape of molten area, which resulted in the reliable weld joint. On the other hand, breaking strength of the specimens with spherical aberration correction was higher than that without spherical aberration correction. Therefore, it is concluded that the focusing condition with spherical aberration correction led to the larger and stable molten area, which resulted in higher joining strength in micro-welding of glass materials.

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Acknowledgments

The authors would like to thank Prof. Dr. Isamu Miyamoto (Osaka University) and Prof. Dr. Yoshiyuki Uno (Okayama University) for helpful discussion during this research. This work was partially supported by Japan Society of the Promotion of Science (JSPS) KAKENHI Grant Number 24760107.

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Authors and Affiliations

  1. Graduate School of Natural Science and Technology, Okayama University, 3-1-1 Tsushimanaka, Kita-ku, Okayama, 700-8530, Japan

    I. H. W. Nordin, Y. Okamoto, A. Okada & T. Takekuni

  2. Kataoka Corporation, 2-14-27 Shinyokohama, Kohoku-ku, Yokohama, 222-0033, Japan

    T. Sakagawa

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  1. I. H. W. Nordin
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  2. Y. Okamoto
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  3. A. Okada
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  4. T. Takekuni
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  5. T. Sakagawa
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Correspondence to I. H. W. Nordin.

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Nordin, I.H.W., Okamoto, Y., Okada, A. et al. Effect of focusing condition on molten area characteristics in micro-welding of borosilicate glass by picosecond pulsed laser. Appl. Phys. A 122, 492 (2016). https://doi.org/10.1007/s00339-016-0026-7

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  • DOI: https://doi.org/10.1007/s00339-016-0026-7

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