本文選題：功率均衡 + MOPA系統(tǒng)　； 參考：《杭州電子科技大學(xué)》2017年碩士論文

【摘要】：伴隨著爆炸式的信息增長,面對人類日益增長的信息交互需求,通信行業(yè)一直致力于尋找新的信息載體,以緩解現(xiàn)如今電磁頻譜資源稀缺所帶來的壓力。向高頻進(jìn)軍一直都是業(yè)界關(guān)注的重點方向。近年來涌現(xiàn)的4G無線通信系統(tǒng)以及其他無線產(chǎn)品大規(guī)模應(yīng)用,使得吉赫茲分米波頻段資源變得更為緊張。光載無線通信技術(shù)(ROF)以及光生毫米波技術(shù)的不斷發(fā)展,使得對毫米波頻段的資源利用成為了一項熱門的課題。在光生毫米波技術(shù)的眾多實驗手段中,光外差拍頻是一種簡單易行的實現(xiàn)方法。雙頻微片激光器作為一種能夠輸出高相干度、大頻差雙頻激光的優(yōu)質(zhì)激光源,是光外差拍頻系統(tǒng)的一個重要組成部分。光外差拍頻技術(shù)的特點,要求雙頻激光器能夠輸出功率均衡,高輸出功率的雙頻激光,本文的內(nèi)容便圍繞這兩個議題展開:(1)對毫米波波段以及相關(guān)技術(shù)背景與前景作了介紹;簡要敘述了光生毫米波的幾種實現(xiàn)方法,對雙頻激光光外差拍頻法原理的優(yōu)勢進(jìn)行了說明;之后對微片激光器及MOPA放大系統(tǒng)的近年來研究成果進(jìn)行了概述。(2)圍繞激光原理以及微片激光器的架構(gòu)分析了4Nd:YVO四能級系統(tǒng)的速率方程、增益系數(shù)曲線、增益飽和及雙頻振蕩等內(nèi)容;基于4Nd:YVO材料的熱力學(xué)特性,對微片激光器的輸出縱模調(diào)諧性能做了理論研究。(3)對4Nd:YVO放大器的二級放大機(jī)制進(jìn)行了研究。針對放大器的小信號增益特性、飽和增益特性、放大器結(jié)構(gòu)選擇、泵浦光與輸入信號光的匹配進(jìn)行了分析。理論分析結(jié)果說明,行波單通二級級聯(lián)的放大器結(jié)構(gòu)相比雙通放大結(jié)構(gòu),在增益效率、熱管理、輸出光束質(zhì)量上具備更大的優(yōu)勢。針對輸入信號光和放大器泵浦光之間的光束匹配,以及輸入信號光與放大器增益曲線的頻譜匹配,進(jìn)行了理論推導(dǎo)與闡述。(4)搭建MOPA實驗裝置,引入具備優(yōu)良冷卻性能的TEC溫控系統(tǒng)以及透鏡組,通過溫度調(diào)諧與泵浦光束聚焦,獲得了良好的頻率匹配與光束匹配。當(dāng)諧振腔溫度Tc穩(wěn)定在16℃時,實現(xiàn)了雙頻功率均衡的放大激光,總功率為16.1W,雙縱模功率比為0.98,頻差為53.2GHz,光束質(zhì)量因數(shù)2M=1.20。
[Abstract]:With the explosive growth of information and the increasing demand for information interaction, the communication industry has been working to find new information carriers to alleviate the pressure brought by the scarcity of electromagnetic spectrum resources. To high-frequency march has been the focus of attention in the industry. The emergence of 4G wireless communication systems and other wireless products in large scale in recent years makes the resources of Ghertz decimeter band more scarce. With the development of optical wireless communication (ROF) and millimeter-wave (MMW) technology, the utilization of millimeter-wave (MMW) resources has become a hot topic. Optical heterodyne frequency is a simple and feasible method in many experiments of millimeter-wave technology. Dual-frequency microchip laser is an important part of optical heterodyne beat frequency system as a high quality laser source which can output high coherence and large frequency difference double frequency laser. The characteristics of optical heterodyne beat frequency technology require dual-frequency laser to output power equalization and high output power dual-frequency laser. This paper introduces millimeter-wave band and related technical background and prospect around these two topics. Several realization methods of millimeter wave generated by light are briefly described, and the advantages of the principle of double frequency laser heterodyne beat method are explained. Secondly, the research results of microchip laser and MOPA amplification system in recent years are summarized. (2) the rate equation and gain coefficient curve of 4Nd:YVO four-level system are analyzed around the principle of laser and the structure of microchip laser. Gain saturation and dual-frequency oscillation. Based on the thermodynamic properties of 4Nd:YVO, the output longitudinal mode tuning performance of microchip laser is theoretically studied. (3) the second-order amplification mechanism of 4Nd:YVO amplifier is studied. The small signal gain characteristic, saturation gain characteristic, amplifier structure selection and the matching between pump light and input signal light are analyzed. The theoretical analysis results show that the two-stage cascaded traveling-wave amplifier structure has more advantages in gain efficiency, thermal management and output beam quality than the double-pass amplifier structure. Aiming at the beam matching between the input signal light and the amplifier pump light, and the spectrum matching between the input signal light and the amplifier gain curve, the theoretical derivation and elaboration of the MOPA experimental device are carried out. The TEC temperature control system and lens group with excellent cooling performance are introduced, and good frequency matching and beam matching are obtained by tuning temperature and focusing the pump beam. When the cavity temperature Tc is stable at 16 鈩，

本文編號：1867131