高占空比LIBS:重复频率和时间宽度对激发激光脉冲的影响

IF 1.9 3区 物理与天体物理 Q2 PHYSICS, MULTIDISCIPLINARY
J. Riedel, Josefin Hufgard, Y. You
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引用次数: 0

摘要

激光诱导击穿光谱(LIBS)是一项日益成熟的技术,每年都有新的变体,如激光烧蚀分子同位素光谱,各种放电技术的再加热,以及多种脉冲激发方案,有时使用不同脉冲长度的激光器。然而,具有固有参数的激光器,如脉冲长度和重复率,仍然几乎完全被使用。近年来,出现了用于加工过程的新型高重复率激光概念,如焊接,铣削和雕刻。本文对单个铝靶的单脉冲LIBS光谱进行了全面研究,以展示柔性高占空比主振荡器功率放大器(MOPA)激光器的适用性。虽然传统的手电筒泵浦法布里-帕姆罗特激光器只允许脉冲能量的变化,并且在非常低的占空比下工作,但MOPA激光器增加了重复率和脉冲长度作为可变参数。对等离子体时间行为的深入分析表明,发射动态与激发激光脉冲模式密切匹配。铝样品的光谱响应受到速率和长度变化的显著影响。虽然Al、Sr和Ca元素谱线的光谱发射强度在参数设置略有不同的情况下都达到峰值,但对AlO分子谱带相对丰度的影响最大。与以前的激光烧蚀分子同位素光谱(LAMIS)出版物不同,后者可以很容易地检测到良好的强度和良好的光谱特征,而无需探测器的任何时间门控。这一发现,加上MOPA激光器既便宜又可靠的事实,为未来的研究提供了一个有希望的组合,包括双原子能带结构的检测。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
LIBS at high duty-cycles: effect of repetition rate and temporal width on the excitation laser pulses
Laser-induced breakdown spectroscopy (LIBS) is becoming a more mature technology every year with new variants such as laser ablation molecular isotopic spectrometry, reheating by various discharge techniques, and multiple pulse excitation schemes, in which sometimes lasers of different pulse lengths are used. However, lasers with inherent parameters like pulse length and repetition rate are still almost exclusively employed. Recent years have witnessed the advent of novel high-repetition-rate laser concepts for machining processes, like welding, milling, and engraving. Here, a comprehensive study of single-pulse LIBS spectra of a single aluminum target is presented to showcase the applicability of flexible high duty-cycle master oscillator power amplifier (MOPA) lasers. Although traditional flashlamp-pumped Fabry–Pérot lasers only permit a variation in the pulse energy and are operated at very low duty-cycles, MOPA lasers add repetition rate and pulse length as variable parameters. A thorough analysis of the temporal plasma behavior revealed the emission dynamic to closely match the excitation laser pulse pattern. An aluminum sample’s spectral response was shown to be significantly impacted by variations in both rate and length. Although the spectral emission strength of the elemental lines of Al, Sr, and Ca all peaked at slightly different parameter settings, the strongest impact was found on the relative abundance of molecular AlO bands. Unlike in previous laser ablation molecular isotopic spectrometry (LAMIS) publications, the latter could be readily detected with a good intensity and well-resolved spectral features without any temporal gating of the detector. This finding, together with the fact that MOPA lasers are both inexpensive and dependable, makes for a promising combination for future studies including the detection of diatomic band structures.
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来源期刊
Frontiers in Physics
Frontiers in Physics Mathematics-Mathematical Physics
CiteScore
4.50
自引率
6.50%
发文量
1215
审稿时长
12 weeks
期刊介绍: Frontiers in Physics publishes rigorously peer-reviewed research across the entire field, from experimental, to computational and theoretical physics. This multidisciplinary open-access journal is at the forefront of disseminating and communicating scientific knowledge and impactful discoveries to researchers, academics, engineers and the public worldwide.
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