【摘要】：平面激光誘導(dǎo)熒光(Planar Laser Induced Fluorescence,PLIF)技術(shù)是使用平面激光脈沖激勵熒光來記錄瞬態(tài)流場和火焰結(jié)構(gòu)的技術(shù),利用激光對自由基團(tuán)和離子的激發(fā),通過對熒光的強度和二維空間的分布的分析,可以得到某些氣體分子的溫度分布,濃度分布以及火焰結(jié)構(gòu)等信息。PLIF技術(shù)具有高空間分辨率,響應(yīng)時間短,高靈敏度的特點,是目前主要的檢測快速變化的流場的技術(shù)。PLIF技術(shù)通常需要使用高重頻大能量可調(diào)諧的染料激光器來反映快速變化的流場,針對高速PLIF診斷對高重頻大能量窄線寬的可調(diào)諧激光技術(shù)的需求,本文開展高重頻大能量可調(diào)諧染料激光器的研究。對于高重頻大能量可調(diào)諧激光器的時域特性,基于染料流動熱管理和液體流動穩(wěn)定性得到了了高重頻下的染料循環(huán)系統(tǒng)的流速為10m/s,測量了激光器的輸出能量波動約為4%,最后,測量了可調(diào)諧激光器的輸出脈寬,可穩(wěn)定在8ns。對于高重頻大能量可調(diào)諧激光器的頻域特性,研究了可調(diào)諧激光的線寬壓窄技術(shù),實現(xiàn)使用光柵進(jìn)行線寬壓窄,研究了可調(diào)諧激光的波長調(diào)諧技術(shù),研究了可調(diào)諧激光的倍頻條件,針對以上技術(shù)進(jìn)行了實際測量,以及理論分析。對于高重頻大能量可調(diào)諧激光器的強度特性,測量了染料激光器的轉(zhuǎn)換效率,基頻光的轉(zhuǎn)換效率約為20%,基頻光的輸出可達(dá)6m J,研究了振蕩級擴(kuò)束鏡對激光輸出的影響以及泵浦光偏振特性對激光輸出的影響,最后,開展倍頻效率的理論分析,其實際測量結(jié)果可達(dá)33%,倍頻光的輸出可達(dá)2.2m J。
[Abstract]:The planar laser-induced fluorescence (Planar Laser Induced Fluorescence,PLIF) technique is a technique of recording the transient flow field and flame structure by using planar laser pulse excitation fluorescence, and using laser to excite free radical groups and ions. Through the analysis of fluorescence intensity and two-dimensional spatial distribution, the temperature distribution, concentration distribution and flame structure of some gas molecules can be obtained. PLIF technology has the characteristics of high spatial resolution, short response time and high sensitivity. PLIF technology usually requires a dye laser with high repetition frequency and tunable energy to reflect the rapidly changing flow field. In view of the demand of high speed PLIF diagnosis for tunable laser technology with high repetition frequency, large energy and narrow linewidth, the research of high repetition frequency and large energy tunable dye laser is carried out in this paper. For the time domain characteristics of high repetition frequency and high energy tunable laser, based on the thermal management of dye flow and the stability of liquid flow, the flow rate of the dye cycle system at high repetition frequency is 10 m / s, and the output energy fluctuation of the laser is about 4. Finally, The output pulse width of the tunable laser is measured, which can be stabilized at 8ns. For the frequency domain characteristic of high repetition frequency and large energy tunable laser, the linewidth and pressure narrowing technology of tunable laser is studied, and the wavelength tunable technology of tunable laser is studied by using grating to narrow line width. The frequency doubling condition of tunable laser is studied, and the practical measurement and theoretical analysis are carried out. For the intensity characteristics of high repetition frequency and high energy tunable laser, the conversion efficiency of dye laser is measured. The conversion efficiency of the fundamental frequency light is about 20 and the output of the fundamental frequency light can reach 6mJ. The influence of the oscillatory beam expander on the laser output and the effect of the polarization characteristics of the pump light on the laser output are studied. Finally, the theoretical analysis of the frequency doubling efficiency is carried out. The practical measurement results can reach 33 and the output of frequency doubling light can reach 2.2 m J.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TN248

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