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  本文關(guān)鍵詞：線形腔鎖模摻鐿光纖激光器研究　出處：《哈爾濱工業(yè)大學(xué)》2016年碩士論文　論文類(lèi)型：學(xué)位論文

  更多相關(guān)文章： 鎖模光纖激光器 非線性光纖環(huán)形鏡 自鎖模 摻鐿光纖 暗脈沖

【摘要】：與環(huán)形腔相比,線形腔被動(dòng)鎖模光纖激光器的諧振腔內(nèi)無(wú)需連接環(huán)形器或者隔離器,具有結(jié)構(gòu)簡(jiǎn)單、成本低、易于集成等優(yōu)點(diǎn)。目前,基于可飽和吸收體(單壁碳納米管、石墨烯、拓?fù)浣^緣體、黑磷及半導(dǎo)體可飽和吸收鏡SESAM等)、光纖非線性效應(yīng)(非線性光纖環(huán)形鏡NOLM、非線性偏振旋轉(zhuǎn)效應(yīng)NPR、非線性光纖放大鏡NALM等)以及自鎖模原理的線形腔鎖模光纖激光器已有報(bào)道。其中SESAM是技術(shù)成熟、應(yīng)用廣泛的一種鎖模器件,能夠獲得納秒乃至飛秒級(jí)激光脈沖,然而SESAM的結(jié)構(gòu)復(fù)雜,而且制作成本高。基于可飽和吸收體的線形腔鎖模光纖激光器的相關(guān)報(bào)道很少,絕大多數(shù)是采用透射式鎖模,這使得可飽和吸收體很容易受到熱損傷的影響,從而限制了高能量鎖模脈沖的輸出。NOLM的實(shí)現(xiàn)只需將一個(gè)2x2光耦合器的兩個(gè)輸出端口連接起來(lái)即可,在制作方面更加簡(jiǎn)單。自鎖模光纖激光器實(shí)現(xiàn)脈沖激光不依賴(lài)外部鎖模器件,通過(guò)對(duì)其脈沖行為的研究,有助于進(jìn)一步理解光纖激光器的自鎖模產(chǎn)生機(jī)制及其性能控制方法。本論文設(shè)計(jì)制作基于非線性光纖環(huán)形鏡的線形腔鎖模摻鐿光纖激光器和自鎖模摻鐿光纖激光器,研究了光纖激光器的脈沖輸出特性,對(duì)它們的相關(guān)特性進(jìn)行了理論和實(shí)驗(yàn)分析。本論文的主要工作如下:1、對(duì)線形腔被動(dòng)鎖模光纖激光器的主要類(lèi)型及其運(yùn)轉(zhuǎn)機(jī)理進(jìn)行了簡(jiǎn)要介紹和分析,概述了各種類(lèi)型鎖模光纖激光器近期的研究進(jìn)展及現(xiàn)狀。2、基于摻鐿光纖速率方程,分析了光纖激光器中增益行為及特性�；趶V義非線性薛定諤方程,建立了線形腔光纖激光器中超短脈沖的傳輸模型,理論分析了自相位調(diào)制、群速度色散以及三階色散對(duì)光脈沖在光纖中演化過(guò)程的影響。模擬并分析了在不同諧振腔長(zhǎng)度、不同摻鐿光纖長(zhǎng)度以及不同可飽和吸收系數(shù)情況下,光脈沖在光纖中穩(wěn)定傳輸時(shí)其頻域和時(shí)域的變化規(guī)律。3、開(kāi)展了基于NOLM的線形腔鎖模摻鐿光纖激光器的實(shí)驗(yàn)研究,測(cè)試了不同長(zhǎng)度環(huán)形鏡的脈沖輸出特性,分別獲得了調(diào)Q,調(diào)Q鎖模以及鎖模激光脈沖,并對(duì)激光脈沖的產(chǎn)生閾值、能量及脈沖寬度等特性進(jìn)行了分析。4、研究了線形腔單包層摻鐿光纖激光器和環(huán)形腔雙包層摻鐿光纖激光器的自鎖模行為及特性。自鎖模光纖激光器中未加入偏振控制器件。在線形腔單包層摻鐿光纖激光器實(shí)驗(yàn)中,通過(guò)改變諧振腔的長(zhǎng)度,分別實(shí)現(xiàn)了自調(diào)Q,自調(diào)Q鎖模以及自鎖模脈沖輸出。而在環(huán)形腔自鎖模雙包層摻鐿光纖激光器中,通過(guò)控制泵浦功率的大小,分別獲得了亮脈沖、亮暗脈沖對(duì)及暗脈沖,并對(duì)環(huán)形腔自鎖模雙包層摻鐿光纖激光器的自脈沖向連續(xù)波的過(guò)渡現(xiàn)象進(jìn)行了分析和討論。
[Abstract]:Compared with the ring cavity, the linear cavity passive mode-locked fiber laser does not need to connect ring or isolator in the resonator, which has the advantages of simple structure, low cost, easy integration and so on. Based on saturable absorbers (single walled carbon nanotubes, graphene, topological insulators, black phosphorus and semiconductor saturable absorbers SESAM, etc.), optical fiber nonlinear effect (NOLM). Nonlinear polarization rotation effect, nonlinear fiber magnifying glass (NALM, etc.) and self-mode-locking principle of linear cavity mode-locked fiber lasers have been reported. Among them, SESAM is a mature technology. A widely used mode-locking device can obtain nanosecond and even femtosecond laser pulses, but the structure of SESAM is complex. There are few reports about linear cavity mode-locked fiber lasers based on saturable absorbers, most of which are transmission mode locking, which makes saturable absorbers vulnerable to thermal damage. This limits the output of high energy mode-locked pulse. NOLM can only be achieved by connecting two output ports of a 2x2 optical coupler. The self-mode-locked fiber laser is independent of the external mode-locking device, and its pulse behavior is studied. In this paper, we design and fabricate the linear cavity mode-locked ytterbium-doped fiber laser and self-mode-locked ytterbium-doped fiber laser based on nonlinear fiber ring mirror. The device. The pulse output characteristics of fiber lasers are studied, and their related characteristics are analyzed theoretically and experimentally. The main work of this thesis is as follows: 1. The main types and operating mechanism of linear cavity passive mode-locked fiber lasers are briefly introduced and analyzed. The recent research progress and present situation of various types of mode-locked fiber lasers are summarized. Based on the rate equation of ytterbium-doped fiber, the gain behavior and characteristics in fiber laser are analyzed. Based on the generalized nonlinear Schrodinger equation, the transmission model of ultrashort pulse in linear cavity fiber laser is established. The effects of self-phase modulation, group velocity dispersion and third-order dispersion on the evolution of optical pulses in optical fiber are analyzed theoretically. Under different ytterbium-doped fiber lengths and different saturable absorption coefficients, the frequency and time domain variations of optical pulse in stable transmission in fiber are obtained. 3. The experimental study of linear cavity mode-locked ytterbium-doped fiber laser based on NOLM is carried out. The pulse output characteristics of ring mirror with different lengths are tested. The Q-switched, Q-switched mode-locked and mode-locked laser pulses are obtained respectively. The generation threshold, energy and pulse width of laser pulse are analyzed. 4. The self-mode-locking behavior and characteristics of linear cavity single-clad ytterbium-doped fiber laser and ring cavity double-clad ytterbium-doped fiber laser are studied. No polarization controller is added to the self-mode-locked fiber laser. In the laser experiment. By changing the length of the resonator, the self-Q-switched mode-locking and self-mode-locked pulse output are realized, respectively. In the ring cavity self-mode-locked double-clad ytterbium-doped fiber laser, the pump power is controlled. Bright pulse, bright dark pulse pair and dark pulse are obtained, and the transition from self pulse to continuous wave of ring cavity self-mode-locked double-clad ytterbium-doped fiber laser is analyzed and discussed.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類(lèi)號(hào)】：TN248

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