發(fā)布時(shí)間：2018-06-25 05:49

  本文選題：隨機(jī)激光 + 光纖激光器��； 參考：《電子科技大學(xué)》2016年碩士論文

【摘要】：隨機(jī)激光器自其被提出以來(lái)就以其背后豐富的物理原理吸引了眾多學(xué)者的研究目光。另一方面,因?yàn)榧す獗闷旨夹g(shù)和光纖技術(shù)的發(fā)展,光纖激光器在固體激光器領(lǐng)域地位愈發(fā)凸顯,在光纖傳感、光纖通信與工業(yè)加工領(lǐng)域前景廣闊。而在2010年,英國(guó)Aston大學(xué)Turitsyn教授等人首次提出基于標(biāo)準(zhǔn)通信光纖的隨機(jī)分布式反饋光纖激光器,自此,隨機(jī)光纖激光器正式成為隨機(jī)激光器和光纖激光器的一個(gè)分支,開(kāi)始吸引學(xué)界目光�？梢钥吹�,隨機(jī)光纖激光器誕生歷史并不長(zhǎng),諸多理論還并不完善,因此本文找準(zhǔn)切入點(diǎn),主要著眼于低閾值、高效率的線(xiàn)性輸出隨機(jī)光纖激光器研究,從理論和實(shí)驗(yàn)上系統(tǒng)研究了該類(lèi)型隨機(jī)光纖激光器的結(jié)構(gòu)和性能,發(fā)展了從一階到高階的該類(lèi)型隨機(jī)光纖激光器完備的理論和結(jié)構(gòu)。借鑒其結(jié)構(gòu)設(shè)計(jì),本文還優(yōu)化實(shí)現(xiàn)了一種新型的高精度、長(zhǎng)距離互相關(guān)型OTDR。具體而言,本文基于穩(wěn)態(tài)功率平衡模型,發(fā)展了一階低閾值、高效率線(xiàn)性輸出隨機(jī)光纖激光器的構(gòu)建方法,并通過(guò)理論分析,揭示了這種結(jié)構(gòu)下產(chǎn)生高效率隨機(jī)光纖激光器的機(jī)理。理論分析表明,反饋點(diǎn)的位置、泵浦波長(zhǎng)選擇和光纖腔體長(zhǎng)度對(duì)于實(shí)現(xiàn)低閾值、高效率線(xiàn)性輸出隨機(jī)光纖激光器至關(guān)重要。對(duì)比這些重要參數(shù),本文選擇5km光纖和1090nm泵浦源進(jìn)行實(shí)驗(yàn)驗(yàn)證。最終實(shí)驗(yàn)實(shí)現(xiàn)一個(gè)低閾值(2W)、高功率(10W泵浦7.13W輸出)、高效率(超過(guò)90%斜效率),工作波長(zhǎng)為1145nm的線(xiàn)性輸出隨機(jī)光纖激光器。進(jìn)一步的,本文在一階輸出成果上發(fā)展了高階的線(xiàn)性輸出隨機(jī)光纖激光器。在構(gòu)建高階線(xiàn)性輸出隨機(jī)光纖激光器的過(guò)程中,本文借鑒已有的隨機(jī)光纖激光器對(duì)于點(diǎn)式反射鏡反射率敏感范圍的研究成果,提出利用菲涅爾反射代替?zhèn)鹘y(tǒng)點(diǎn)式反射鏡的方法,成功實(shí)現(xiàn)高階的線(xiàn)性隨機(jī)激光輸出。本文同時(shí)還考察了此種激光器的功率分布、光轉(zhuǎn)換效率以及其他關(guān)鍵特性,為設(shè)計(jì)一個(gè)該類(lèi)型隨機(jī)光纖激光器提供了理論指導(dǎo),特別是在實(shí)現(xiàn)特定輸出功率時(shí),為如何設(shè)計(jì)具有最高轉(zhuǎn)換效率的該類(lèi)型隨機(jī)光纖激光器提供了必要的信息。實(shí)驗(yàn)驗(yàn)證的該類(lèi)型二階隨機(jī)激光器其輸出斜效率達(dá)到48.8%,實(shí)現(xiàn)的最大輸出功率為~2W(受限于8.75W泵浦功率)。最重要的是其線(xiàn)性輸出特性在許多不同的應(yīng)用場(chǎng)合中也更受青睞。最后,本文借鑒隨機(jī)光纖激光器的構(gòu)建方法,實(shí)現(xiàn)了一個(gè)全光纖的超寬帶混沌源,并基于該混沌源實(shí)現(xiàn)了一種高精度、長(zhǎng)距離的互相關(guān)型OTDR。在這一過(guò)程中,本文詳細(xì)分析了限制互相關(guān)型OTDR傳感性能的關(guān)鍵因素。提高系統(tǒng)的光信噪比是解決這一問(wèn)題的關(guān)鍵,本文據(jù)此提出分布式拉曼放大的方法和增加采樣時(shí)間這兩個(gè)可行的方法。最后,基于這兩種方法,本文成功實(shí)現(xiàn)了厘米量級(jí)空間分辨率,超過(guò)100km光纖斷點(diǎn)定位監(jiān)測(cè)的互相關(guān)型OTDR。本文所做的關(guān)于線(xiàn)性輸出隨機(jī)光纖激光器的研究對(duì)于豐富隨機(jī)光纖激光器的理論具有重要意義;關(guān)于隨機(jī)光纖激光器的應(yīng)用探索則有助于實(shí)現(xiàn)隨機(jī)光纖激光器的進(jìn)一步實(shí)際應(yīng)用。
[Abstract]:On the other hand, because of the development of laser pumping technology and optical fiber technology, the status of fiber laser in the field of solid laser is becoming more and more prominent. In the field of optical fiber sensing, optical fiber communication and industrial processing, the future of random lasers has a wide prospect. In 20 In the 10 year, Professor Turitsyn of Aston University of England and others first proposed a random distributed feedback fiber laser based on standard communication fiber. From this point, random fiber laser has become a branch of random laser and fiber laser. It can be seen that the birth history of random fiber laser is not long, many theories can be seen. The theory is not perfect. Therefore, this paper tries to find a breakthrough point, mainly focusing on the low threshold, high efficiency linear output random fiber laser. The structure and performance of this type of random fiber laser are systematically studied in theory and experiment, and the complete theory and structure of this type of random fiber laser from first order to high order are developed. In view of its structure design, this paper also optimizes a new type of high precision and long distance cross correlation OTDR.. In this paper, based on the steady state power balance model, the construction method of the first order low threshold and high efficiency linear output random fiber laser is developed. By theoretical analysis, the high efficiency random light is produced under this structure. The theoretical analysis shows that the position of the feedback point, the selection of the pump wavelength and the length of the fiber cavity are very important for the low threshold and high efficiency linear output of the random fiber laser. Comparing these important parameters, this paper selects the 5km fiber and the 1090nm pump source to carry out the experimental verification. Finally, a low threshold (2W) is realized by the experiment. High power (10W pumped 7.13W output), high efficiency (more than 90% oblique efficiency) and linear output random fiber laser with a working wavelength of 1145nm. Further, this paper develops a high-order linear output random fiber laser in the first order output. This paper is used for reference in the process of constructing high order linear output random fiber laser. The results of the research on the reflectivity sensitive range of the point type reflector by random fiber laser are presented, and the method of replacing the traditional point reflector with Finel reflection is proposed, and the high order linear random laser output is successfully realized. This type of random fiber laser provides theoretical guidance, especially when the specific output power is realized. It provides the necessary information for how to design the type of random fiber laser with the highest conversion efficiency. The experimental verification of the type two order random laser has an output skew efficiency of 48.8% and the maximum output power of ~2W ( It is limited to 8.75W pump power. The most important thing is that its linear output characteristics are also more popular in many different applications. Finally, this paper uses the construction method of random fiber laser to realize a all fiber ultra wideband chaotic source, and based on the chaotic source, a high precision, long distance cross correlation type OTDR. is realized. In this paper, the key factors that restrict the performance of interdependent OTDR sensing are analyzed in detail. Improving the optical signal to noise ratio of the system is the key to solve this problem. In this paper, two feasible methods of distributed Raman amplification and increasing sampling time are proposed. Finally, based on these two methods, this paper successfully realizes the centimeter level empty. The research on linear output random fiber laser is of great significance to the theory of the rich random fiber laser. The application of the random fiber laser is helpful to the further practical application of the random fiber laser.
【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】：2016
【分類(lèi)號(hào)】：TN248

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