本文選題：2μm激光器　切入點：Tm:YAP　出處：《北京交通大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：2μm波段激光器經(jīng)過長期發(fā)展,已經(jīng)進入科研、軍事、激光醫(yī)療、環(huán)境保護、材料加工等領(lǐng)域,并且得到了廣泛的應(yīng)用。由于2μm激光在許多方面所具有的優(yōu)越性質(zhì),2μm激光器已經(jīng)成為固體激光器中一個重要的研究領(lǐng)域。鑒于其重要的應(yīng)用價值,本文對Tm:YAP激光器展開了理論分析和實驗研究,具體工作包括以下五個方面： (1)對Tm:YAP晶體特性的分析,包括Tm3+離子的能級結(jié)構(gòu)特性分析,YAP晶體的物理特性分析,Tm:YAP晶體的光譜特性分析,以及Tm:YAP晶體的熱透鏡效應(yīng)四個方面。其中,主要研究了Tm:YAP晶體的熱透鏡效應(yīng),包括Tm:YAP晶體的熱透鏡焦距的理論推導(dǎo)和結(jié)合具體參數(shù)的數(shù)值計算。 (2)研究了Tm:YAP激光器的速率方程模型,包括：Tm:YAP激光器低四位能級速率方程模型和連續(xù)Tm:YAP激光器速率方程模型。研究激光器的發(fā)光機理是研究激光器的基礎(chǔ),而速率方程則是研究激光器工作過程的主要依據(jù),通過研究模型并求解速率方程,分析各個因素對激光器輸出的影響,這也是優(yōu)化設(shè)計激光器的基礎(chǔ)。 (3)分析了直腔的理論模型,利用MATLAB軟件對諧振腔進行優(yōu)化設(shè)計,模擬出激光器的穩(wěn)區(qū)范圍和激光光斑半徑在腔內(nèi)的變化情況。結(jié)合實驗,對比各種腔型的輸出功率情況,選擇有效補償Tm:YAP晶體熱效應(yīng)的最佳腔型,實現(xiàn)連續(xù)Tm:YAP激光器的穩(wěn)定、高功率輸出。當(dāng)輸出透鏡透過率為5%時,獲得4.92W的1.98μm連續(xù)波激光輸出,相對應(yīng)的泵浦功率為17W,斜率效率為36.57%。使用ANDOR光譜儀測得激光器輸出中心波長為1985nm。采用NanoScan光束測量儀,測得了在同一位置不同泵浦功率下的輸出光斑輪廓。 (4)研究了Z型腔Tm:YAP激光器的理論模型,設(shè)計了四鏡折疊腔,根據(jù)四鏡折疊腔的穩(wěn)定性條件和像散補償條件,利用MATLAB軟件對諧振腔進行優(yōu)化設(shè)計。結(jié)合實驗,對比不同腔型的功率輸出情況,選出最佳腔型。輸入泵浦功率為14W時,得到最大輸出功率為2.27W,斜率效率為23.9%。 (5)對可調(diào)諧Tm:YAP激光器進行了理論設(shè)計研究,主要包括雙折射濾光片的設(shè)計和工作原理分析。分析了在腔內(nèi)加雙折射濾光片和布氏板實現(xiàn)Tm:YAP激光器調(diào)諧運轉(zhuǎn)的基本理論。
[Abstract]:After a long period of development, 2 渭 m band lasers have entered the fields of scientific research, military, laser medical treatment, environmental protection, material processing, etc. Because of its advantages in many aspects, 2 渭 m laser has become an important research field in solid-state lasers. In this paper, the theoretical analysis and experimental study of Tm:YAP laser are carried out. The specific work includes the following five aspects:. 1) the analysis of Tm:YAP crystal characteristics, including the analysis of the energy level structure of Tm3 ion and the analysis of the spectral characteristics of Tm:YAP crystal and the thermal lens effect of Tm:YAP crystal. The thermal lens effect of Tm:YAP crystal is studied, including the theoretical derivation of the focal length of thermal lens of Tm:YAP crystal and the numerical calculation combined with specific parameters. (2) the rate equation model of Tm:YAP laser is studied, including the model of low four-bit energy level rate equation and the rate equation model of CW Tm:YAP laser. The study of the luminescence mechanism of the laser is the basis of the study of the laser. The rate equation is the main basis for studying the working process of the laser. By studying the model and solving the rate equation, the influence of various factors on the laser output is analyzed, which is also the basis of the optimal design of the laser. The theoretical model of the straight cavity is analyzed, and the optimal design of the resonator is carried out by using MATLAB software. The stable range of the laser and the variation of the laser spot radius in the cavity are simulated. In combination with the experiment, the output power of various cavity types is compared. The optimal cavity for effectively compensating the thermal effect of Tm:YAP crystal is chosen to realize the stable and high power output of the CW Tm:YAP laser. When the transmission rate of the output lens is 5, the 1.98 渭 m CW laser output of 4.92 W is obtained. The pump power is 17W and the slope efficiency is 36.57.The output center wavelength of the laser is measured by ANDOR spectrometer to be 1985nm.The profile of the output spot at the same position and different pump power is measured by using the NanoScan beam measuring instrument. The theoretical model of Z-cavity Tm:YAP laser is studied, and the four-mirror folded cavity is designed. According to the stability condition and astigmatic compensation condition of four-mirror folded cavity, the resonator is optimized by MATLAB software. When the input pump power is 14W, the maximum output power is 2.27W and the slope efficiency is 23.9W. In this paper, the theoretical design of tunable Tm:YAP laser is studied, including the design of birefringent filter and the analysis of its working principle. The basic theory of tunable operation of Tm:YAP laser by adding birefringent filter and Brinell plate into cavity is analyzed.
【學(xué)位授予單位】：北京交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TN248

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