本文選題：光纖激光器 + 被動調(diào)Q　； 參考：《電子科技大學》2016年碩士論文

【摘要】：調(diào)Q技術(shù)是一種獲得窄脈寬、高能量激光脈沖的重要技術(shù)。與傳統(tǒng)的激光器相比,被動調(diào)Q光纖激光器由于具有結(jié)構(gòu)緊湊、成本低廉、效率高、散熱好等特點而備受人們的青睞,已經(jīng)在激光加工、生物醫(yī)藥和大容量光通信領(lǐng)域得到了廣泛應用。近年來,以石墨烯(Graphene)、過渡金屬硫化物(包括層狀二硫化鉬(MoS2)、層狀二硫化鎢(WS2)等)以及它們的范德瓦爾斯異質(zhì)結(jié)為代表的二維材料因具有獨特的光學、電子學特性而成為了各國科學家關(guān)注的焦點。因此,基于二維材料的被動調(diào)Q光纖激光器研究具有重要的學術(shù)意義和實用價值。本文主要對基于石墨烯、Graphene/MoS2異質(zhì)結(jié)、Graphene/WS2異質(zhì)結(jié)三種二維材料的被動調(diào)Q光纖激光器進行了實驗研究:1、采用化學氣相沉積法(CVD)制備的單層石墨烯作為可飽和吸收體,搭建了可調(diào)諧的被動調(diào)Q光纖激光器,通過調(diào)節(jié)腔內(nèi)的可調(diào)諧濾波器,實現(xiàn)了輸出脈沖波長在1519~1589nm之間的連續(xù)可調(diào),調(diào)諧范圍達到70nm,分析了波長調(diào)諧對輸出脈沖的重復頻率、脈寬和脈沖能量等特性的影響。當輸出脈沖的中心波長在1559.9 nm時,調(diào)節(jié)泵浦功率,輸出脈沖的重復頻率范圍為8.55 kHz~38.26 kHz,最小脈沖寬度為3.45μs,脈沖能量最大值為138.76 nJ。2、制備了Graphene/MoS2范德瓦爾斯異質(zhì)結(jié)二維材料,實驗表征了該材料在1550nm波長處的可飽和吸收特性。構(gòu)建了基于Graphene/MoS2異質(zhì)結(jié)可飽和吸收體的線形腔被動調(diào)Q光纖激光器,獲得的輸出脈沖的中心波長為1559.97 nm,重復頻率在15.53 kHz~45.03 kHz之間可調(diào),最小脈寬為1.36μs,最大脈沖能量為37.7nJ,分析了泵浦功率對輸出脈沖特性的影響。3、制備了Graphene/WS2范德瓦爾斯異質(zhì)結(jié)二維材料,實驗表征了該材料在1550nm波長處的可飽和吸收特性。搭建了基于Graphene/WS2異質(zhì)結(jié)的可調(diào)諧被動調(diào)Q光纖激光器,通過調(diào)節(jié)腔內(nèi)的可調(diào)諧濾波器,實現(xiàn)了輸出脈沖波長在1509~1589 nm之間的連續(xù)可調(diào),調(diào)諧范圍達到80nm,分析了波長調(diào)諧對輸出脈沖的重復頻率、脈寬和脈沖能量等特性的影響。當輸出脈沖的中心波長在1550 nm時,調(diào)節(jié)泵浦功率,輸出脈沖的重復頻率范圍為10.81~33.65kHz,最小脈沖寬度為2.33μs,脈沖能量最大值為147.2 nJ。
[Abstract]:Q-switching is an important technique for obtaining narrow pulse width and high energy laser pulse. Compared with the traditional laser, passive Q-switched fiber laser has been widely used in laser processing because of its compact structure, low cost, high efficiency and good heat dissipation. Biomedicine and large-capacity optical communication are widely used. In recent years, graphene, transition metal sulfides (including layered molybdenum disulfide (MoS2), layered tungsten disulfide (WS2), etc.) and their van der Waals heterostructures have been characterized by their unique optical properties. Electronic characteristics have become the focus of scientists all over the world. Therefore, the study of passive Q-switched fiber lasers based on two-dimensional materials has important academic significance and practical value. In this paper, the passive Q-switched fiber laser based on Graphene / MoS2 heterojunction and Graphene / WS2 heterojunction is studied experimentally. The monolayer graphene prepared by chemical vapor deposition (CVD) is used as saturable absorber. A tunable passively Q-switched fiber laser is built. By adjusting the tunable filter in the cavity, the output pulse wavelength is continuously adjustable between 1519~1589nm and the tuning range is up to 70 nm. The repetition rate of the output pulse by wavelength tuning is analyzed. The effect of pulse width and pulse energy. When the central wavelength of the output pulse is at 1559.9 nm, the pump power is adjusted. The repetition frequency range of the output pulse is 8.55 kHz, the minimum pulse width is 3.45 渭 s, and the maximum pulse energy is 138.76 nm J. 2. A two-dimensional heterojunction of Graphene / MoS2 van der Waals heterojunction has been prepared. The saturable absorption of the material at 1550nm wavelength was characterized experimentally. A linear cavity passively Q-switched fiber laser based on the saturated absorber of Graphene / MoS2 heterojunction has been constructed. The central wavelength of the output pulse is 1559.97 nm and the repetition rate is between 15.53 kHz and 45.03 kHz. The minimum pulse width is 1.36 渭 s and the maximum pulse energy is 37.7 nJ. The influence of pump power on the output pulse characteristics is analyzed. A novel two-dimensional Graphene / WS2 van der Waals heterojunction material is prepared. The saturation absorptivity of the material at 1550nm wavelength is experimentally characterized. A tunable passive Q-switched fiber laser based on Graphene / WS2 heterojunction is built. By adjusting the tunable filter in the cavity, the output pulse wavelength of 1509 nm is continuously adjustable. The tuning range is up to 80 nm. The effects of wavelength tuning on the repetition rate, pulse width and pulse energy of the output pulse are analyzed. When the central wavelength of the output pulse is at 1550 nm, the pump power is adjusted, the repetition frequency range of the output pulse is 10.81kHz 33.65kHz, the minimum pulse width is 2.33 渭 s, and the maximum pulse energy is 147.2 NJ.
【學位授予單位】：電子科技大學
【學位級別】：碩士
【學位授予年份】：2016
【分類號】：TN248

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