本文選題：雙脈沖 + 飛秒激光�。� 參考：《吉林大學(xué)》2015年碩士論文

【摘要】：激光誘導(dǎo)擊穿光譜（LIBS）技術(shù)作為一種分析工具，自問(wèn)世以來(lái)，就被公認(rèn)為是一種前景廣闊的新技術(shù)。隨著激光器、光譜儀等相關(guān)儀器的不斷更新進(jìn)步，超短脈沖激光器被引入到激光誘導(dǎo)等離子體光譜技術(shù)中來(lái)，使LIBS技術(shù)進(jìn)入了飛秒時(shí)代；由于脈沖激光系統(tǒng)具有的不穩(wěn)定性、照射過(guò)程的不可重復(fù)性、待測(cè)樣品基體效應(yīng)的影響以及探測(cè)器產(chǎn)生的噪聲信號(hào)干擾等多種因素，LIBS技術(shù)在實(shí)驗(yàn)中探測(cè)的結(jié)果標(biāo)準(zhǔn)偏差往往比較高，而使用雙脈沖激光可以顯著提升激發(fā)光譜的強(qiáng)度，進(jìn)而提高探測(cè)精度和信噪比。使用飛秒激光器和雙脈沖技術(shù)，會(huì)明顯提高激光誘導(dǎo)等離子體實(shí)驗(yàn)的準(zhǔn)確率和可重復(fù)性。 本文由四個(gè)章節(jié)組成。在第一章里，介紹了激光誘導(dǎo)等離子體光譜技術(shù)的特點(diǎn)及其應(yīng)用研究，并提出了飛秒激光誘導(dǎo)光譜技術(shù)和雙脈沖飛秒激光誘導(dǎo)等離子體光譜技術(shù)；在第二章中，對(duì)激光誘導(dǎo)等離子體光譜技術(shù)的理論進(jìn)行了系統(tǒng)闡述，介紹了在激光燒蝕物質(zhì)等離子體光譜分析應(yīng)用中常用的方法，例如等離子體電子溫度的計(jì)算方法、電子密度的計(jì)算方法等；在第三章，我們?cè)趯?shí)驗(yàn)中應(yīng)用雙脈沖飛秒激光系統(tǒng)來(lái)誘導(dǎo)擊穿等離子體光譜對(duì)Fe樣品進(jìn)行研究，對(duì)采集到的Fe等離子體光譜數(shù)據(jù)進(jìn)行了分析處理，，并且選取了波長(zhǎng)在410-445nm范圍內(nèi)的3條譜線，利用玻爾茲曼斜線法計(jì)算了Fe樣品的等離子體電子溫度，以及利用斯塔克展寬法在波長(zhǎng)432.58nm的光譜譜線上求解了Fe等離子體電子密度，最終得到Fe樣品等離子體的電子溫度與延遲時(shí)間間隔、電子密度與延遲時(shí)間間隔的關(guān)系表，并得出了實(shí)驗(yàn)滿足局部熱力學(xué)平衡的依據(jù)；第四章是總結(jié)與展望，總結(jié)了實(shí)驗(yàn)研究的意義，并指出存在的問(wèn)題以及下一步研究的方向。
[Abstract]:Laser induced breakdown spectroscopy (LIBS), as an analytical tool, has been recognized as a promising new technique since its inception. With the development of laser, spectrometer and other related instruments, ultrashort pulse laser is introduced into laser-induced plasma spectrum technology, which makes Libs technology enter the femtosecond era. The non-repeatability of the irradiation process, the influence of the matrix effect of the sample to be tested, and the noise signal interference produced by the detector, etc. The standard deviation of the results detected by the LIBS technique in the experiment is often relatively high. The intensity of excitation spectrum can be significantly increased by using double pulse laser, and the detection accuracy and signal-to-noise ratio can be improved. The accuracy and repeatability of laser-induced plasma experiments can be improved by using femtosecond laser and double pulse technique. This paper consists of four chapters. In the first chapter, the characteristics and application of laser-induced plasma spectroscopy are introduced, and femtosecond laser-induced spectroscopy and dual-pulse femtosecond laser-induced plasma spectroscopy are proposed. In this paper, the theory of laser-induced plasma spectroscopy (LIPs) is systematically described, and the methods commonly used in the analysis of laser-ablated plasma spectra, such as the calculation of plasma electron temperature, are introduced. In the third chapter, we use the double pulse femtosecond laser system to induce breakdown plasma spectrum to study the Fe sample, and analyze and process the collected Fe plasma spectral data, in the third chapter, we use the double pulse femtosecond laser system to induce the breakdown plasma spectrum to study the Fe sample. The electron temperature of Fe sample was calculated by Boltzmann slant method, and the electron density of Fe plasma was calculated by Stark broadening method on the spectral line of wavelength 432.58nm. Finally, the relation table of electron temperature and delay time interval, electron density and delay time interval of Fe sample plasma is obtained, and the basis of experimental meeting the local thermodynamic equilibrium is obtained. The significance of experimental research is summarized, and the existing problems and the direction of further research are pointed out.
【學(xué)位授予單位】：吉林大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TN249;O562.3

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