本文選題：光纖激光器 + 調(diào)Q技術(shù)�。� 參考：《吉林大學(xué)》2017年碩士論文

【摘要】：自1986年Alcock初次將調(diào)Q技術(shù)引入光纖激光器以來,調(diào)Q光纖激光器一直是激光技術(shù)領(lǐng)域的研究熱點(diǎn)之一。調(diào)Q光纖激光器具有脈寬窄、峰值功率高、脈沖能量高、光束質(zhì)量好等特性,使其在醫(yī)學(xué)治療、環(huán)境遙感、激光測距、工業(yè)生產(chǎn)等領(lǐng)域中展現(xiàn)出獨(dú)特的應(yīng)用價(jià)值。調(diào)Q光纖激光器有主動調(diào)Q和被動調(diào)Q兩種,其中被動調(diào)Q光纖激光器無需額外加入調(diào)制器,結(jié)構(gòu)緊湊,系統(tǒng)簡單、成本低,且具有更高的運(yùn)行效率,是獲得高重頻的納秒、亞納秒激光脈沖的重要方式。本文從理論與實(shí)驗(yàn)兩方面對被動調(diào)Q摻鐿光纖激光器進(jìn)行了研究。理論上,建立被動調(diào)Q摻鐿光纖激光器的理論模型,對被動調(diào)Q摻鐿光纖激光器進(jìn)行數(shù)值仿真,探究不同因素對其輸出特性產(chǎn)生的影響;實(shí)驗(yàn)上,搭建了兩種不同腔結(jié)構(gòu)的被動調(diào)Q摻鐿光纖激光器,分別研究與分析了脈沖輸出特性,并將其性能進(jìn)行了比較。具體工作如下:1.闡述了調(diào)Q的基本原理,詳細(xì)介紹了被動調(diào)Q的基本原理,概述了不同可飽和吸收體的工作特性。2.對被動調(diào)Q摻鐿光纖激光器進(jìn)行了理論仿真研究。建立了被動調(diào)Q摻鐿光纖激光器的理論模型、傳輸方程、速率方程,模擬仿真研究了泵浦功率、可飽和吸收體光纖長度、摻雜濃度等對激光器輸出特性的影響。3.基于仿真結(jié)果,搭建了單腔結(jié)構(gòu)的被動調(diào)Q摻鐿光纖激光器,研究了泵浦功率、可飽和吸收體光纖長度對其輸出特性的影響,并進(jìn)行分析與討論。在可飽和吸收體長度為2m時(shí),泵浦功率在660m W-1.5W范圍內(nèi),獲得最窄脈沖寬度4.8μs的1064nm調(diào)Q脈沖輸出。4.為進(jìn)一步得到穩(wěn)定被動調(diào)Q脈沖輸出,搭建一種雙腔結(jié)構(gòu)的全光纖化被動調(diào)Q摻鐿光纖激光器。該激光器采用線形雙腔結(jié)構(gòu),利用被動調(diào)Q和增益調(diào)制相結(jié)合的技術(shù)方案,實(shí)現(xiàn)了最窄脈寬2.6μs、脈沖重復(fù)頻率在13.23kHz-40.6kHz范圍內(nèi)可調(diào),中心波長為1064nm的平滑、穩(wěn)定的脈沖輸出。并探究了脈沖特性隨可飽和吸收體光纖長度的變化情況。相對于單腔被動調(diào)Q摻鐿光纖激光器而言,雙腔被動調(diào)Q摻鐿光纖激光器穩(wěn)定性能得到一定改善。該激光器通過雙腔的交叉調(diào)制,保證了脈沖激光的穩(wěn)定高效輸出,可以作為高性能脈沖產(chǎn)生方式的新選擇。文章最后對全文的主要工作進(jìn)行了總結(jié)與展望。
[Abstract]:Since Alcock first introduced Q-switched technology into fiber laser in 1986, Q-switched fiber laser has been one of the hotspots in the field of laser technology. Q-switched fiber laser has the characteristics of narrow pulse width, high peak power, high pulse energy and good beam quality. It has shown unique application value in medical treatment, environmental remote sensing, laser ranging, industrial production and so on. There are two kinds of Q-switched fiber lasers: active Q-switched and passive Q-switched, among which the passive Q-switched fiber laser does not need additional modulator, which has the advantages of compact structure, simple system, low cost and higher operating efficiency. It is a nanosecond to obtain high repetition frequency. An important way of subnanosecond laser pulses. In this paper, the passive Q-switched ytterbium-doped fiber laser is studied theoretically and experimentally. Theoretically, the theoretical model of passively Q-switched ytterbium-doped fiber laser is established, and the numerical simulation of passively Q-switched ytterbium-doped fiber laser is carried out to explore the influence of different factors on its output characteristics. Two kinds of passively Q-switched ytterbium-doped fiber lasers with different cavity structures are constructed. The pulse output characteristics are studied and analyzed, and their performances are compared. The work is as follows: 1. This paper expounds the basic principle of Q-switching, introduces the basic principle of passive Q-switching in detail, and summarizes the working characteristics of different saturable absorbers. The theoretical simulation of passive Q-switched ytterbium-doped fiber laser is carried out. The theoretical model, transmission equation and rate equation of passively Q-switched ytterbium-doped fiber laser are established. The effects of pump power, fiber length of saturable absorber and doping concentration on the output characteristics of the laser are simulated. Based on the simulation results, a single-cavity passively Q-switched ytterbium-doped fiber laser is constructed. The effects of pump power and the length of saturable absorber fiber on the output characteristics are studied and discussed. When the length of saturable absorber is 2m and pump power is 660m W-1.5W, the output of 1064nm Q-switched pulse with the narrowest pulse width of 4.8 渭 s is obtained. In order to obtain stable passive Q-switched pulse output, a dual-cavity passive Q-switched ytterbium-doped fiber laser is constructed. The laser adopts a linear dual-cavity structure, which combines passive Q-switching and gain modulation. The narrowest pulse width is 2.6 渭 s, the pulse repetition rate is adjustable in the range of 13.23kHz-40.6kHz, and the center wavelength is smooth and stable pulse output of 1064nm. The variation of pulse characteristics with the length of saturable absorber fiber is investigated. Compared with single-cavity passively Q-switched ytterbium-doped fiber laser, the stability of double-cavity passively Q-switched ytterbium-doped fiber laser has been improved. This laser can be used as a new choice of high performance pulse generation mode because of the stable and high efficiency output of the pulse laser through the cross modulation of two cavities. Finally, the main work of this paper is summarized and prospected.
【學(xué)位授予單位】：吉林大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TN248

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