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<p>To achieve high precision processing, laser aided manufacturing has been applied due to many advantages. However, without understanding fundamental interaction characteristics, its advantages cannot be fully utilized. This paper presents a direct comparative investigation of UV (355&#xa0;nm) and IR (1064&#xa0;nm) nanosecond laser drilling on Ni-Au coated beryllium copper (BeCu). By varying the repetition rate while keeping the average power constant, we analyzed the material removal characteristics. The results reveal that the IR laser process is dominated by thermal effects strongly dependent on pulse energy; a lower repetition rate (105&#xa0;kHz) yielded higher pulse energy, resulting in a larger heat-affected zone and crater size. In contrast, the UV laser exhibited more consistent and efficient material removal regardless of the repetition rate, which is attributed to its significantly higher absorption rate in the material. This study clarifies the distinct processing mechanisms of the two wavelengths and provides a practical guide for selecting the optimal laser process for Ni-Au coated BeCu.</p>

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Comparative study of UV and IR nanosecond laser drilling on Ni-Au-coated beryllium copper: the effect of repetition rate on material removal characteristics

  • 期刊论文

  • 发表日期：

    2025年9月17日

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  • Seungik Son,
  • Dongkyoung Lee

摘要

To achieve high precision processing, laser aided manufacturing has been applied due to many advantages. However, without understanding fundamental interaction characteristics, its advantages cannot be fully utilized. This paper presents a direct comparative investigation of UV (355 nm) and IR (1064 nm) nanosecond laser drilling on Ni-Au coated beryllium copper (BeCu). By varying the repetition rate while keeping the average power constant, we analyzed the material removal characteristics. The results reveal that the IR laser process is dominated by thermal effects strongly dependent on pulse energy; a lower repetition rate (105 kHz) yielded higher pulse energy, resulting in a larger heat-affected zone and crater size. In contrast, the UV laser exhibited more consistent and efficient material removal regardless of the repetition rate, which is attributed to its significantly higher absorption rate in the material. This study clarifies the distinct processing mechanisms of the two wavelengths and provides a practical guide for selecting the optimal laser process for Ni-Au coated BeCu.