本文選題：光纖激光器 + 隨機激光��； 參考：《電子科技大學》2017年碩士論文

【摘要】：調(diào)Q光纖激光器具有光束質(zhì)量好、亮度高和波長可選擇等諸多優(yōu)點,其在精密加工、光纖通信和醫(yī)療應用等許多領(lǐng)域具有獨特的應用價值。光纖隨機激光器無縱模的特點,使得對于該種激光器輸出特性的調(diào)控是當前研究的難點和熱點。之前很多對基于受激布里淵散射的調(diào)Q型光纖隨機激光器的研究中,時域輸出調(diào)Q脈沖形狀不規(guī)則,重復頻率也不確定,在時域輸出方面還不能做到有效的控制,因此,對于該種激光器時域輸出脈沖的調(diào)節(jié)和規(guī)整十分重要。針對這些現(xiàn)狀,本課題研究基于有源光纖的隨機激光器時域調(diào)Q脈沖的產(chǎn)生和調(diào)控,首先實現(xiàn)了一種寬帶反射型調(diào)Q光纖隨機激光器,詳細分析了時域調(diào)Q脈沖的輸出特性,并通過對比實驗驗證了該激光器調(diào)Q脈沖的產(chǎn)生機制。然后,通過引入混合光纖諧振環(huán)結(jié)構(gòu),對寬帶反射型調(diào)Q光纖隨機激光器做了進一步的優(yōu)化,提出并實現(xiàn)了一種諧振濾波型調(diào)Q光纖隨機激光器,極大地優(yōu)化了調(diào)Q脈沖的連續(xù)性和每一個調(diào)Q周期中子脈沖序列的形狀及脈沖間隔。具體內(nèi)容包括:搭建基于有源光纖的寬帶反射型調(diào)Q光纖隨機激光器系統(tǒng),激光腔一端由環(huán)形器拉環(huán)構(gòu)成反射鏡,另一端由色散補償光纖提供分布式反饋,在簡單的光纖結(jié)構(gòu)中結(jié)合了隨機激光和調(diào)Q來產(chǎn)生隨機的調(diào)Q脈沖輸出,激光器閾值比較低,但每個調(diào)Q周期中子脈沖序列不規(guī)則;通過分別去掉激光腔一端的環(huán)形反射鏡或色散補償光纖來進行對比實驗,然后分析和驗證了隨機調(diào)Q脈沖的產(chǎn)生機制。通過將寬帶反射型調(diào)Q光纖隨機激光器中的環(huán)形反射鏡改為一個由兩個10:90耦合器和一個環(huán)形器構(gòu)成的混合型光纖諧振環(huán)結(jié)構(gòu),提出了一種諧振濾波型調(diào)Q光纖隨機激光器,實現(xiàn)了對于隨機脈沖從無序到有序的調(diào)控和規(guī)整:調(diào)Q脈沖序列基本是連續(xù)的,不再有較長時間范圍的間斷;調(diào)Q脈沖的幅度分布更集中一些,主要分布在0.3到0.5之間;單個調(diào)Q周期中包含多級具有相同脈沖形狀、相同脈沖間隔、能量依次衰減的子脈沖序列,子脈沖序列變得更加規(guī)整。
[Abstract]:Q-switched fiber laser has many advantages, such as good beam quality, high brightness and choice of wavelength. It has unique application value in many fields such as precision machining, optical fiber communication and medical treatment. The characteristic of fiber random laser without longitudinal mode makes it difficult and hot to control the output characteristics of this kind of laser. In previous studies of Q-switched fiber random lasers based on stimulated Brillouin scattering, the output Q-switched pulses in time domain are irregular in shape and uncertain in repetition frequency, so they can not be effectively controlled in time domain output. It is very important for this kind of laser to adjust and adjust the output pulse in time domain. In order to solve these problems, the generation and control of time-domain Q-switched pulses of random lasers based on active fiber are studied in this paper. Firstly, a kind of wide-band reflected Q-switched fiber random lasers is realized, and the output characteristics of time-domain Q-switched pulses are analyzed in detail. The generation mechanism of Q-switched pulse is verified by contrast experiment. Then, by introducing the hybrid fiber resonant ring structure, the broad-band Q-switched fiber random laser is further optimized, and a resonant filter Q-switched fiber random laser is proposed and realized. The continuity of Q-switched pulses and the shape and interval of each Q-switched periodic neutron pulse sequence are greatly optimized. The main contents are as follows: a wide-band Q-switched fiber random laser system based on active fiber is built. One end of the laser cavity is composed of ring loop, the other end is distributed feedback provided by dispersion compensation fiber. In the simple fiber structure, random laser and Q-switched are combined to produce random Q-switched pulse output. The threshold of the laser is relatively low, but each Q-switched periodic neutron pulse sequence is irregular. By removing the ring mirror at one end of the laser cavity or the dispersion compensation fiber, the mechanism of random Q-switched pulse generation is analyzed and verified. By changing the ring mirror of broad-band Q-switched fiber random laser into a hybrid fiber resonant ring structure composed of two 10:90 couplers and a ring device, a resonant filter Q-switched fiber random laser is proposed. The modulation and regularity of random pulses from disorder to order are realized: the sequence of Q-switched pulses is basically continuous, and the amplitude distribution of Q-switched pulses is more concentrated, mainly ranging from 0.3 to 0.5; A single Q-switched cycle consists of sub-pulse sequences with the same pulse shape, the same pulse interval, and the energy decay in turn, and the sub-pulse sequence becomes more regular.
【學位授予單位】：電子科技大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TN248

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