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Crown Glass Drilling by Short-Pulse CO2 Laser with Tunable Pulse Tail

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Abstract

Hole drilling in crown glass with a large thermal expansion coefficient of 94 × 10−7 /K by a longitudinally excited short-pulse CO2 laser with a tunable laser pulse tail was investigated. The CO2 laser produced short laser pulses with a pulse width of about 250 ns, a pulse tail with a length of 31.4 to 134.7 μs, a spike pulse to pulse tail energy ratio of 1:7 to 1:92, and a fluence per single pulse of 6.0 to 37.9 J/cm2 at a repetition rate of 1 to 400 Hz. Sample cooling was not employed in the drilling process. At a repetition rate of 1 to 90 Hz, the CO2 laser pulses produced cracks. At a repetition rate of 100 to 140 Hz, the CO2 laser pulses occasionally produced cracks and crack-free holes. At a repetition rate of 150 to 400 Hz, the CO2 laser pulses produced crack-free holes. Under various irradiation conditions, the hole depth and estimated hole volume per total irradiation fluence depended on the fluence per single pulse but did not depend on the laser pulse waveform or repetition rate.

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Data Availability

The data that support the findings of this study are available from the corresponding author upon reasonable request.

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Acknowledgments

This work was supported by JST A-STEP, No. AS3015041S. We would like to thank Seidensha Electronics CO., LTD of Japan.

Funding

This work was supported by JST A-STEP, grant No. AS3015041S.

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Authors and Affiliations

  1. Integrated Graduate School of Medicine, Engineering, and Agricultural Sciences, University of Yamanashi, 4-3-11 Takeda, Kofu, Yamanashi, 400-8511, Japan

    Md. Ekhlasur Rahaman & Kazuyuki Uno

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  1. Md. Ekhlasur Rahaman
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  2. Kazuyuki Uno
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Correspondence to Md. Ekhlasur Rahaman.

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Rahaman, M.E., Uno, K. Crown Glass Drilling by Short-Pulse CO2 Laser with Tunable Pulse Tail. Lasers Manuf. Mater. Process. 9, 72–80 (2022). https://doi.org/10.1007/s40516-022-00165-7

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