本文選題：碲酸鹽微結構光纖 + 超連續(xù)光源　； 參考：《吉林大學》2015年碩士論文

【摘要】：寬波段全光纖超連續(xù)光源在前沿科學研究、光通信、環(huán)境監(jiān)測、醫(yī)療、國防安全等領域有著重要的應用。尤其在國防安全領域，由于超連續(xù)光源不僅具有寬度可達數千納米的光譜，而且具有高的亮度和相干性，因此可對各類光電探測器進行全譜覆蓋和干擾，實現超寬波段范圍內的光電對抗。實現寬波段的超連續(xù)光源是國際學術界和工業(yè)界努力追求的目標。目前，基于石英微結構光纖的0.32m波段超連續(xù)光源研究已經趨于成熟。進一步將超連續(xù)光源波長拓展到中紅外波段,研制波長大于2m的中紅外波段超連續(xù)相干光源具有非常重要的意義。 由于石英光纖的透過窗口相對較窄（僅覆蓋0.32.5m波段），這限制了它在中紅外波段超連續(xù)光源研制中的應用。為了產生中紅外波段超連續(xù)相干光源,國內外研究者們已經把目光轉向了新型的碲酸鹽、氟化物和硫化物微結構光纖,這些光纖的光學透過窗口可覆蓋中紅外波段。其中，由于碲酸鹽微結構光纖具有高的非線性系數、較好的熱穩(wěn)定性和化學穩(wěn)定性、相對較寬的中紅外透過窗口，因此它有望被用于研制具有實用化水平的全光纖緊湊型中紅外波段超連續(xù)光源。盡管目前在基于碲酸鹽微結構光纖的超連續(xù)光源研究方面已經取得了一定的進展，，但在該方面缺乏系統(tǒng)的研究，而且碲酸鹽微結構光纖中的中紅外波段光參量過程研究幾乎是空白。在攻讀碩士期間，作者在基于碲酸鹽微結構光纖的超連續(xù)光源研究方面進行了系統(tǒng)的研究，取得了以下研究結果。 在理論模擬方面我們進行了以下三個方面的研究工作：（1）研究了光纖的結構對光纖色散，非線性系數和有效模場面積等光纖參數的影響。模擬結果表明，纖芯和空氣孔尺寸都對光纖的參數有著重要影響，光纖的非線性系數，有效模場面積呈現非單調變化特性。（2）建立了光纖中光脈沖傳輸的理論模型，利用分步傅里葉法對基于碲酸鹽微結構光纖的超連續(xù)光源產生進行了系統(tǒng)的理論模擬，綜合考慮了光纖結構、光纖長度、色散特性、泵浦激光脈寬、峰值功率等因素，重點討論了泵浦激光峰值功率、脈沖寬度和纖芯直徑對超連續(xù)光譜產生的影響。模擬結果表明，對于波長為1560nm的飛秒激光泵浦源，實現寬波段超連續(xù)光譜產生的最佳光纖芯徑約為3.5μm。（3）對碲酸鹽微結構光纖中的寬帶可調諧參量光產生進行了一些理論探索工作。理論模擬結果表明，當泵浦光波長為1560nm時，可以獲得覆蓋2065-2925nm波段的寬調諧參量光產生；當泵浦光波長為2m時，可以獲得覆蓋3540-4185nm的寬調諧參量光產生。 在實驗方面，首先我們用棒管法拉制了具有不同纖芯直徑的碲酸鹽微結構光纖，然后使用1560nm的飛秒脈沖激光泵浦碲酸鹽微結構光纖研究了光纖中超連續(xù)光譜的產生，探索了泵浦激光峰值功率、光纖長度和纖芯直徑等參數對超連續(xù)光譜產生的影響。通過優(yōu)化實驗參數，當泵浦激光脈寬為1.2ps，平均功率為725mW，光纖長度為3cm時，獲得了覆蓋1017-2300nm波段的超連續(xù)光源。
[Abstract]:The wide band all fiber supercontinuous light source has an important application in frontier scientific research, optical communication, environmental monitoring, medical treatment, national defense security and other fields. Especially in the field of national defense security, because the supercontinuous light source not only has the spectrum of thousands of nanometers, but also has high brightness and coherence, it can be carried out to all kinds of photodetectors. Full spectrum coverage and interference to realize the optoelectronic countermeasures in the ultra wide band range. The realization of the ultra continuous light source in the wide band is the goal pursued by the international academic and industrial circles. At present, the research on the 0.32m band supercontinuous light source based on the quartz microstructural fiber has become mature. The mid infrared band supercontinuum coherent light source with wavelength greater than 2m is of great significance.
Because the transmission window of the quartz fiber is relatively narrow (covering only the 0.32.5m band), it restricts its application in the development of the super continuous light source in the middle infrared band. In order to produce the super continuous coherent light source in the middle infrared band, the researchers at home and abroad have turned their eyes to the new tellurate, the fluoride and the sulfide microstructural fiber, these fibers. The optical transmission window can cover the middle infrared band, in which the tellurite microstructural fiber has a high nonlinear coefficient, good thermal stability and chemical stability, and a relatively wide mid infrared window. Therefore, it is expected to be used to develop a compact medium infrared supercontinuous light source with a practical level. At present, some progress has been made in the research of supercontinuous light source based on tellurite microstructural fiber, but there is a lack of systematic research in this respect, and the study of the optical parametric process in the middle infrared band of tellurite microstructural fiber is almost blank. During the period of master's study, the author was based on the supercontinuum based on tellurite microstructural fiber. The research of light source has been systematically studied and the following research results have been achieved.
In the field of theoretical simulation, we have carried out the following three aspects: (1) study the influence of fiber structure on fiber dispersion, nonlinear coefficient and effective mode field area. The simulation results show that the core and air hole size have an important influence on the parameters of the fiber, the nonlinear coefficient of the optical fiber, the effective mode scene. The product presents non monotonic characteristics. (2) a theoretical model of optical pulse transmission in optical fiber is established. A systematic theoretical simulation of the production of supercontinuous light source based on tellurite microstructural fiber is carried out by step Fu Liye method. The optical fiber structure, fiber length, dispersion, pump laser pulse width, peak power and other factors are considered. The effect of the peak power of the pumped laser, the pulse width and the diameter of the core on the generation of the supercontinuum is discussed. The simulation results show that the optimum fiber core diameter of the wide band supercontinuum is about 3.5 mu m. (3) for the generation of the Broadband Tunable Parametric light in the tellurite microstructural fiber for the femtosecond laser pumping source with a wavelength of 1560nm. The theoretical simulation results show that when the wavelength of the pump is 1560nm, the wide tuning parametric light can be generated in the 2065-2925nm band. When the wavelength of the pump is 2m, the wide tuning parametric light can be produced to cover the 3540-4185nm.
In the experiment, we first made the tellurite microstructural fiber with different core diameter with the rod tube Fala. Then we use the 1560nm's femtosecond pulse laser to pump tellurite microstructural fiber to study the generation of the supercontinuum in the optical fiber, and explore the peak power of the pump laser, the length of the fiber and the diameter of the core, and the supercontinuous light. By optimizing the experimental parameters, when the pump laser pulse width is 1.2ps, the average power is 725mW and the fiber length is 3cm, the supercontinuous light source covering the 1017-2300nm band is obtained.
【學位授予單位】：吉林大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TN253

【共引文獻】

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本文編號：1997370