本文選題：主動鎖模　切入點：摻鐿光纖激光器　出處：《北京理工大學(xué)》2015年碩士論文

【摘要】：隨著激光技術(shù)的飛速發(fā)展，脈沖激光器已經(jīng)被廣泛運用于醫(yī)療、工業(yè)加工、激光武器、激光可控核聚變等多個領(lǐng)域。相比于傳統(tǒng)的固體激光器，光纖激光器有著增益特性好、轉(zhuǎn)換效率高、易于和光纖耦合等特點，因此鎖模光纖激光器成為了目前超快激光研究領(lǐng)域的一個熱門研究課題，本文從理論和實驗兩個方面對鎖模摻鐿光纖激光器進(jìn)行了具有一定深度的研究，，主要內(nèi)容如下： 1．對于鎖模摻鐿光纖激光器及其國內(nèi)外研究進(jìn)展進(jìn)行了文獻(xiàn)調(diào)研，對比分析了各種設(shè)計方案的優(yōu)缺點，在此基礎(chǔ)上提出了自己的設(shè)計方案。 2．結(jié)合自己的設(shè)計方案，在忽略放大自發(fā)輻射（ASE）的情況下，從速率方程出發(fā)，推導(dǎo)出了環(huán)行腔和線型腔摻鐿光纖激光器的增益、閾值功率、輸出功率和斜效率的解析表達(dá)式。并且討論了諧振腔關(guān)鍵參數(shù)（泵浦功率、摻鐿光纖長度、輸出耦合比）和激光器輸出參數(shù)（輸出功率、斜效率）之間的關(guān)系，并進(jìn)行了數(shù)值分析，得到了最佳優(yōu)化參數(shù)和激光器理論極限參數(shù) 3．針對使用相位調(diào)制器鎖模帶來的輸出不穩(wěn)定問題，從非線性薛定諤方程出發(fā)，建立主動鎖模摻鐿光纖激光器的數(shù)值模型，通過Matlab進(jìn)行模擬仿真。通過逐步調(diào)整腔內(nèi)平均色散大小，解決了輸出激光脈沖的不穩(wěn)定問題。在穩(wěn)定鎖模的基礎(chǔ)上，進(jìn)一步研究了激光器關(guān)鍵參數(shù)（色散、非線性、小信號增益系數(shù)、鎖模階數(shù)、調(diào)制深度）對于激光器輸出脈沖特性（脈沖寬度、重復(fù)頻率）的影響。仿真結(jié)果表明，激光器可以穩(wěn)定的輸出皮秒量級的高質(zhì)量光脈沖，重復(fù)頻率為4.9GHz，脈沖寬度為2.6ps，在理論上驗證了本文設(shè)計方案的可行性，并且進(jìn)行了結(jié)構(gòu)和參數(shù)方面的優(yōu)化，對于后續(xù)實驗工作具有一定意義上的指導(dǎo)作用。 4.選購用于組成環(huán)行腔激光器的各項器件，搭建了主動鎖模摻鐿光纖激光器實驗裝置，通過調(diào)試在基頻點處獲得了鎖模脈沖輸出。 本文設(shè)計方案的特色是使用了光子晶體光纖，通過在環(huán)行腔內(nèi)加入光子晶體進(jìn)行色散補償，解決了輸出脈沖不穩(wěn)定問題，同時對輸出光脈沖的脈寬進(jìn)行了壓縮。
[Abstract]:With the rapid development of laser technology, pulsed lasers have been widely used in medical treatment, industrial processing, laser weapons, laser controlled nuclear fusion and other fields. Compared with conventional solid-state lasers, fiber lasers have good gain characteristics. Because of its high conversion efficiency and easy coupling with fiber, mode-locked fiber laser has become a hot research topic in the field of ultra-fast laser research. In this paper, the mode-locked ytterbium-doped fiber laser is studied theoretically and experimentally. The main contents are as follows:. 1. Based on the literature investigation of mode-locked ytterbium-doped fiber laser and its research progress at home and abroad, the merits and demerits of various design schemes are compared and analyzed. Based on this, the author puts forward his own design scheme. 2. Based on the rate equation, the gain and threshold power of ytterbium-doped fiber laser with annular cavity and linear cavity are derived under the condition of neglecting the amplified spontaneous emission (ASE). The relationship between the key parameters (pump power, ytterbium-doped fiber length, output coupling ratio) and laser output parameters (output power, skew efficiency) is discussed. The optimum optimization parameters and the theoretical limit parameters of the laser are obtained by numerical analysis. 3. Aiming at the output instability caused by mode-locking of phase modulator, a numerical model of active mode-locked ytterbium-doped fiber laser is established based on nonlinear Schrodinger equation. Through Matlab simulation, the instability of output laser pulse is solved by adjusting the average dispersion in cavity step by step. The key parameters (dispersion, nonlinearity) of laser are further studied on the basis of stable mode-locking. The effects of small signal gain coefficient, mode-locking order, modulation depth on the output pulse characteristics (pulse width, repetition rate) of the laser are discussed. The simulation results show that the laser can output a high quality optical pulse of picosecond order. The repetition rate is 4.9 GHz and the pulse width is 2.6 ps.Therefore, the feasibility of the design is verified theoretically, and the structure and parameters are optimized. 4. The experimental device of active mode-locked ytterbium-doped fiber laser is built, and the output of mode-locked pulse is obtained at the fundamental frequency point by debugging. The characteristic of the design is that the photonic crystal fiber is used to compensate the dispersion of the output pulse by adding the photonic crystal in the ring cavity, and the pulse width of the output pulse is compressed.
【學(xué)位授予單位】：北京理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TN248

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