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Ablation-cooled material removal with ultrafast bursts of pulses

机译：消融冷却的材料去除，脉冲超快

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摘要

The use of femtosecond laser pulses allows precise and thermal damage -free removal of material (ablation) with wide-ranging scientificl(1,5), medical(6-11) and industrial applications(12). However, its potential is limited by the low speeds at which material can be removed(1,9-11,13) and the complexity of the associated laser technology. The complexity of the laser design arises from the need to overcome the high pulse energy threshold for efficient ablation. However, the use of more powerful lasers to increase the ablation rate results in unwanted effects such as shielding, saturation and collateral damage from heat accumulation at higher laser powers(6,13,14). Here we circumvent this limitation by exploiting ablation cooling, in analogy to a technique routinely used in aerospace engineering(13,16). We apply ultrafast successions (bursts) of laser pulses to ablate the target material before the residual heat deposited by previous pulses diffuses away from the processing region. Proof-of-principle experiments on various substrates demonstrate that extremely high repetition rates, which make ablation cooling possible, reduce the laser pulse energies needed for ablation and increase the efficiency of the removal process by an order of magnitude over previously used laser parameters(17,18). We also demonstrate the removal of brain tissue at two cubic millimetres per minute and dentine at three cubic millimetres per minute without any thermal damage to the bulk(9,11).
机译：飞秒激光脉冲的使用可在广泛的科学（1,5），医疗（6-11）和工业应用（12）中实现精确且无热损伤的材料去除（消融）。然而，它的潜力受到材料可去除的低速（1,9-11,13）和相关激光技术的复杂性的限制。激光器设计的复杂性源于需要克服高脉冲能量阈值以进行有效烧蚀的需求。但是，使用功率更高的激光来提高烧蚀率会导致不必要的影响，例如在较高的激光功率下由于热量积聚而产生的屏蔽，饱和和附带损害（6,13,14）。在这里，我们类似于航空航天工程中常规使用的技术，通过利用消融冷却来规避这一限制（13,16）。我们应用超快速连续的激光脉冲（爆发）来烧蚀目标材料，然后再利用之前的脉冲沉积的残余热量扩散离开处理区域。在各种基板上进行的原理验证实验表明，极高的重复频率使烧蚀冷却成为可能，降低了烧蚀所需的激光脉冲能量，并使去除过程的效率比以前使用的激光参数提高了一个数量级（17） ，18）。我们还展示了以每分钟2立方毫米的速度去除脑组织和以每分钟3立方毫米的速度去除牙本质而对体积没有任何热损伤（9,11）。

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  • 来源
    《Nature》 |2016年第7618期|84-88|共5页
  • 作者

    Kerse Can; Kalaycioglu Hamit; Elahi Parviz; Cetin Barbaros; Kesim Denizhan K.; Akcaalan Onder; Yavas Seydi; Asik Mehmet D.; Oktem Bulent; Hoogland Heinar; Holzwarth Ronald; Ilday Fatih Omer;

  • 作者单位

    Bilkent Univ, Dept Elect & Elect Engn, TR-06800 Ankara, Turkey;

    Bilkent Univ, Dept Phys, TR-06800 Ankara, Turkey;

    Bilkent Univ, Dept Phys, TR-06800 Ankara, Turkey;

    Bilkent Univ, Dept Mech Engn, TR-06800 Ankara, Turkey;

    Bilkent Univ, Dept Elect & Elect Engn, TR-06800 Ankara, Turkey;

    Bilkent Univ, Dept Elect & Elect Engn, TR-06800 Ankara, Turkey;

    FiberLAST Inc, TR-06531 Ankara, Turkey;

    Hacettepe Univ, Nanotechnol & Nanomed Dept, TR-06800 Ankara, Turkey;

    ASELSAN, TR-06150 Ankara, Turkey;

    Menlo Syst GmbH, Kloperspitz 19a, D-82152 Martinsried, Germany|Univ Erlangen Nurnberg, Dept Phys, Lehrstuhl Laserphys, D-91058 Erlangen, Germany;

    Menlo Syst GmbH, Kloperspitz 19a, D-82152 Martinsried, Germany;

    Bilkent Univ, Dept Elect & Elect Engn, TR-06800 Ankara, Turkey|Bilkent Univ, Dept Phys, TR-06800 Ankara, Turkey;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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