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】：調(diào)Q脈沖光纖激光器可以將激光器諧振腔存儲的能量在極短時間內(nèi)釋放出來,形成脈沖寬度在ns量級、峰值功率在KW量級的調(diào)Q激光脈沖輸出。結(jié)合主振蕩功率放大方案,其平均輸出功率可達幾百W,在激光加工、激光雷達、光時域反射計、非線性頻率變換等方面有著廣泛應(yīng)用。聲光調(diào)Q作為調(diào)Q脈沖光纖激光器的一種實現(xiàn)方式,具有輸出調(diào)Q激光脈沖性能穩(wěn)定、可控性好等優(yōu)點,獲得了廣泛關(guān)注。本文搭建了非對稱腔、對稱腔兩種結(jié)構(gòu)的聲光調(diào)Q脈沖光纖激光器實驗系統(tǒng),對輸出調(diào)Q激光脈沖的重頻、平滑度、輸出功率、脈寬等特性進行了較為深入的研究,分析了泵浦功率、聲光Q開關(guān)重復(fù)頻率對輸出調(diào)Q激光脈沖重頻的影響,優(yōu)化了輸出調(diào)Q激光脈沖中的多峰現(xiàn)象,獲得了平滑脈沖輸出。所做具體工作如下:首先,介紹了調(diào)Q技術(shù)原理以及常用的調(diào)Q實現(xiàn)方法,理論分析了泵浦功率、諧振腔處于低Q值的時間、腔長等因素對調(diào)Q脈沖光纖激光器輸出特性的影響。詳細介紹了聲光調(diào)Q脈沖光纖激光器的工作原理。其次,搭建了非對稱腔和對稱腔兩種結(jié)構(gòu)的聲光調(diào)Q脈沖光纖激光器實驗系統(tǒng),研究了聲光Q開關(guān)開啟時間為5μs、重復(fù)頻率在10KHz-80KHz范圍內(nèi)變化時,輸出調(diào)Q激光脈沖的特性。非對稱腔結(jié)構(gòu)中采用后向泵浦方式,獲得的最大輸出功率為1.61W,最窄脈寬為61ns。對稱腔結(jié)構(gòu)中采用半導(dǎo)體激光器單獨泵浦、半導(dǎo)體模塊單獨泵浦、半導(dǎo)體激光器+半導(dǎo)體模塊對稱泵浦三種泵浦方式,在對稱泵浦時,獲得最大輸出功率為0.59W,最窄脈寬為58ns。然后,論文中還著重在非對稱腔和對稱腔兩種結(jié)構(gòu)下研究了輸出調(diào)Q激光脈沖的重頻特性和平滑特性。無論是在非對稱腔結(jié)構(gòu)還是對稱腔結(jié)構(gòu)中,泵浦功率、聲光Q開關(guān)重復(fù)頻率只有在一定的范圍內(nèi),輸出調(diào)Q激光脈沖重頻才能與聲光Q開關(guān)重復(fù)頻率一致。當(dāng)泵浦功率固定時,隨著聲光Q開關(guān)重復(fù)頻率的增大,輸出調(diào)Q激光脈沖重頻依次為聲光Q開關(guān)重復(fù)頻率、聲光Q開關(guān)重復(fù)頻率的1/2、聲光Q開關(guān)重復(fù)頻率的1/3;當(dāng)聲光Q開關(guān)重復(fù)頻率固定時,隨著泵浦功率的減小,輸出調(diào)Q激光脈沖重頻依次為聲光Q開關(guān)重復(fù)頻率、聲光Q開關(guān)重復(fù)頻率的1/2、聲光Q開關(guān)重復(fù)頻率的1/3。在非對稱腔結(jié)構(gòu)中,通過增大泵浦功率、降低聲光Q開關(guān)重復(fù)頻率、減小聲光Q開關(guān)開啟時間的方法可以減少輸出調(diào)Q激光脈沖中多峰的個數(shù)、優(yōu)化脈沖波形,并且利用此種方法,在泵浦功率為8W,聲光Q開關(guān)重復(fù)頻率為10KHz、開啟時間為230ns時,獲得了脈寬為38ns的平滑調(diào)Q激光脈沖輸出。在對稱腔結(jié)構(gòu)中,通過對稱泵浦的方式,獲得了重頻在10KHz-80KHz范圍內(nèi)可調(diào)的平滑調(diào)Q激光脈沖輸出。本文在非對稱腔、對稱腔兩種腔結(jié)構(gòu)下研究了聲光調(diào)Q脈沖光纖激光器的輸出特性,并對輸出調(diào)Q激光脈沖的重頻特性和平滑特性進行了著重研究,最終獲得了重頻為10KHz-80KHz的平滑調(diào)Q激光脈沖輸出。
[Abstract]:Q-switched pulse fiber laser can release the energy stored in the resonator in a very short time to form Q-switched laser pulse with pulse width of ns and peak power of KW. Combined with the main oscillation power amplification scheme, the average output power can reach several hundred ws. it is widely used in laser processing, lidar, optical time domain reflectometer, nonlinear frequency conversion and so on. Acousto-optic Q-switching as a realization method of Q-switched pulse fiber laser has been paid more and more attention because of its stable performance and good controllability. In this paper, an experimental system of acousto-optic Q-switched pulse fiber laser with asymmetric cavity and symmetrical cavity is built. The characteristics of output Q-switched laser pulse, such as repetition frequency, smoothness, output power and pulse width, are studied deeply. The effects of pump power and repetition rate of acousto-optic Q-switch on the repetition rate of output Q-switched laser pulse are analyzed. The multi-peak phenomenon in the output Q-switched laser pulse is optimized and the smooth pulse output is obtained. The specific work is as follows: firstly, the principle of Q-switched technology and the commonly used Q-switching methods are introduced. The pump power and the time of low Q value of the resonator are analyzed theoretically. The effect of cavity length on the output characteristics of Q-switched pulsed fiber laser. The principle of acoustooptic Q-switched pulsed fiber laser is introduced in detail. Secondly, the experimental system of acousto-optic Q-switched pulse fiber laser with asymmetric cavity and symmetrical cavity is built. The characteristics of Q-switched laser pulse are studied when the switching time of acousto-optic Q-switch is 5 渭 s and the repetition rate is in the range of 10KHz-80KHz. The maximum output power is 1.61W and the narrowest pulse width is 61ns. In the symmetrical cavity structure, the semiconductor laser is used to pump alone, the semiconductor module to pump alone, and the semiconductor module to pump symmetrically. The maximum output power is 0.59 W and the narrowest pulse width is 58 ns. Then, the repetition and smoothing characteristics of the output Q-switched laser pulses are also studied in the asymmetric cavity and the symmetric cavity. The repetition rate of the output Q-switched laser pulse can be consistent with that of the acousto-optic Q-switch if the pump power and the repetition rate of the Q-switching switch are only within a certain range in the asymmetric cavity structure or the symmetrical cavity structure. When the pump power is fixed, the repetition frequency of the output Q-switched laser pulse is in turn the acousto-optic Q-switched repetition frequency with the increase of the acousto-optic Q-switch repetition frequency. The repetition rate of acousto-optic Q switch is 1 / 2 and that of acousto-optic Q switch is 1 / 3. When the repetition rate of acousto-optic Q switch is fixed, with the decrease of pump power, the repetition frequency of output Q-switched laser pulse is in turn acousto-optic Q-switched repetition frequency. The repetition rate of acoustooptic Q switch is 1 / 2, and that of acoustooptic Q switch is 1 / 3. In asymmetric cavity structure, by increasing pump power, decreasing the repetition frequency of acousto-optic Q switch and decreasing the opening time of acousto-optic Q-switch, the number of multi-peaks in the output Q-switched laser pulse can be reduced, and the pulse waveform can be optimized. By using this method, when the pump power is 8 W, the repetition rate of acousto-optic Q switch is 10 kHz and the opening time is 230ns, the smooth Q-switched laser pulse with pulse width of 38ns is obtained. In the symmetrical cavity structure, a smooth Q-switched laser pulse output with adjustable repetition frequency in the 10KHz-80KHz range is obtained by symmetric pumping. In this paper, the output characteristics of acousto-optic Q-switched pulse fiber laser are studied under two kinds of cavity structures: asymmetric cavity and symmetric cavity, and the repetition and smoothing characteristics of the output Q-switched laser pulse are studied emphatically. Finally, a smooth Q-switched laser pulse with repetition frequency of 10KHz-80KHz is obtained.
【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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