本文選題：光纖激光器 + 隨機(jī)激光��； 參考：《電子科技大學(xué)》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(diǎn),其在精密加工、光纖通信和醫(yī)療應(yīng)用等許多領(lǐng)域具有獨(dú)特的應(yīng)用價(jià)值。光纖隨機(jī)激光器無縱模的特點(diǎn),使得對(duì)于該種激光器輸出特性的調(diào)控是當(dāng)前研究的難點(diǎn)和熱點(diǎn)。之前很多對(duì)基于受激布里淵散射的調(diào)Q型光纖隨機(jī)激光器的研究中,時(shí)域輸出調(diào)Q脈沖形狀不規(guī)則,重復(fù)頻率也不確定,在時(shí)域輸出方面還不能做到有效的控制,因此,對(duì)于該種激光器時(shí)域輸出脈沖的調(diào)節(jié)和規(guī)整十分重要。針對(duì)這些現(xiàn)狀,本課題研究基于有源光纖的隨機(jī)激光器時(shí)域調(diào)Q脈沖的產(chǎn)生和調(diào)控,首先實(shí)現(xiàn)了一種寬帶反射型調(diào)Q光纖隨機(jī)激光器,詳細(xì)分析了時(shí)域調(diào)Q脈沖的輸出特性,并通過對(duì)比實(shí)驗(yàn)驗(yàn)證了該激光器調(diào)Q脈沖的產(chǎn)生機(jī)制。然后,通過引入混合光纖諧振環(huán)結(jié)構(gòu),對(duì)寬帶反射型調(diào)Q光纖隨機(jī)激光器做了進(jìn)一步的優(yōu)化,提出并實(shí)現(xiàn)了一種諧振濾波型調(diào)Q光纖隨機(jī)激光器,極大地優(yōu)化了調(diào)Q脈沖的連續(xù)性和每一個(gè)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(jī)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(bǔ)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(jī)激光和調(diào)Q來產(chǎn)生隨機(jī)的調(diào)Q脈沖輸出,激光器閾值比較低,但每個(gè)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(bǔ)償光纖來進(jìn)行對(duì)比實(shí)驗(yàn),然后分析和驗(yàn)證了隨機(jī)調(diào)Q脈沖的產(chǎn)生機(jī)制。通過將寬帶反射型調(diào)Q光纖隨機(jī)激光器中的環(huán)形反射鏡改為一個(gè)由兩個(gè)10:90耦合器和一個(gè)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(jī)激光器,實(shí)現(xiàn)了對(duì)于隨機(jī)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(shí)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(gè)調(diào)Q周期中包含多級(jí)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(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TN248

【相似文獻(xiàn)】

相關(guān)期刊論文 前8條

1 劉海;劉勁松;王春;;散射顆粒分布對(duì)二維隨機(jī)激光器腔內(nèi)各模式的影響[J];光學(xué)與光電技術(shù);2006年01期

2 王宏,劉勁松;隨機(jī)激光器的理論與研究現(xiàn)狀[J];物理;2003年04期

3 王可嘉,王宏,劉勁松;隨機(jī)激光器的最新進(jìn)展[J];激光與光電子學(xué)進(jìn)展;2003年02期

4 劉勁松;劉海;王春;呂健滔;樊婷;王曉東;;二維隨機(jī)激光器的模式選擇及閾值與飽和特性[J];物理學(xué)報(bào);2006年08期

5 王可嘉;張清泉;呂健滔;杜澤明;劉勁松;;一維隨機(jī)激光器中準(zhǔn)態(tài)模的飽和特性研究[J];應(yīng)用光學(xué);2007年06期

6 王可嘉;劉勁松;呂健滔;;雙光子抽運(yùn)隨機(jī)激光器中輻射光能量的演化[J];物理學(xué)報(bào);2007年07期

7 李志全;劉瑋;牛力勇;李文超;孫宇超;;氧化鋅隨機(jī)激光器脊?fàn)畈▽?dǎo)外延層的設(shè)計(jì)研究[J];中國激光;2011年11期

8 劉海;張祥軍;任子暉;呂健滔;;一維隨機(jī)介質(zhì)內(nèi)光波模式的頻率微分特性研究[J];量子光學(xué)學(xué)報(bào);2011年01期

相關(guān)博士學(xué)位論文 前2條

1 石凡;無序介質(zhì)中光子局域化行為的研究及調(diào)控[D];南開大學(xué);2012年

2 史林興;納米ZnO復(fù)合薄膜制備與光學(xué)特性研究[D];南京理工大學(xué);2007年

相關(guān)碩士學(xué)位論文 前9條

1 曾曉佩;有源光纖隨機(jī)激光器調(diào)Q特性研究[D];電子科技大學(xué);2017年

2 朱葉雨;基于拉曼放大的特種光纖隨機(jī)激光器特性研究[D];電子科技大學(xué);2014年

3 趙晶晶;ZnO隨機(jī)激光器的設(shè)計(jì)及特性研究[D];燕山大學(xué);2016年

4 杜藝瑩;環(huán)形波導(dǎo)隨機(jī)激光器的設(shè)計(jì)研究[D];燕山大學(xué);2014年

5 熊崢;隨機(jī)激光器的偏振依賴特性與閾值特性的理論研究[D];華中科技大學(xué);2007年

6 王可嘉;隨機(jī)激光器的幾個(gè)前沿理論課題研究[D];華中科技大學(xué);2004年

7 李建鋒;釹玻璃粉末隨機(jī)激光器的理論與實(shí)驗(yàn)研究[D];華中科技大學(xué);2009年

8 鄭莎;非球形粒子為散射體的隨機(jī)介質(zhì)中光傳輸特性[D];燕山大學(xué);2012年

9 何齊恒;基于增益調(diào)控隨機(jī)光纖激光器的特性研究[D];電子科技大學(xué);2017年

，

本文編號(hào)：1780899