【作者】 董淑福；

【导师】 陈国夫；

【作者基本信息】 中国科学院研究生院（西安光学精密机械研究所） ， 光学， 2004， 博士

【摘要】 由于稀土掺杂的光纤激光器在许多领域展现出诱人的应用前景，并呈现出逐步替代现有传统高功率激光器的趋势，因此，开展稀土掺杂光纤激光器，如3μm与2μm级联振荡Ho³⁺：ZBLAN光纤激光器、Tm³⁺：Ho³⁺共掺石英光纤激光器以及Er³⁺：Yb³⁺双包层共掺光纤激光器等的理论与新技术研究，不仅具有重要的科学价值，而且将对促进我国医疗、通信、军事、工业加工等领域的发展有着十分重要的意义。 本论文的主要研究工作及创新如下： 1、在国内首次基于3μm与2μm级联振荡Ho³⁺：ZBLAN光纤激光器的工作原理建立了1.1μm带泵浦下级联振荡Ho³⁺：ZBLAN光纤激光器的动态、稳态速率方程以及功率传输方程与相应的边界条件，建立了比较完善的理论模型，并进行了该激光器稳态、动态特性的数值分析。数值分析表明，级联振荡Ho³⁺：ZBLAN光纤激光器具有极高的能量转换效率，并容易产生级联振荡。 2、国内首次从实验上开展了3μm与2μm级联振荡Ho³⁺：ZBLAN光纤激光器的探索，获得波长约2920nm和2040nm的微弱的级联激光辐射。 3、国内首次对Tm³⁺：Ho³⁺共掺石英光纤激光器产生激光的机理进行了研究，建立了796nm及1180nm激光泵浦的Tm³⁺：Ho³⁺共掺石英光纤激光器的理论模型，并进行了稳态特性的数值分析。然后从实验上开展了Tm³⁺：Ho³⁺共掺石英光纤激光器的研究，分别用功率为1.4W的796nm的Ti：S激光器和功率为6.4W的光纤Raman激光器泵浦。对于后者，在光纤长度为1m时，获得了最大930mW的激光输出，中心波长为1880nm，光—光转换效率30％，这是由Tm³⁺辐射跃迁产生；当光纤长度为3m时，最大激光输出降为650mW，而中心波长移到1960nm，这是Ho³⁺辐射跃迁所致。 4、首次利用Ti：S激光器作泵浦源，并利用Ti：S激光腔和Tm³⁺：Ho³⁺共掺石英光纤构成复合腔外腔调谐的方法，成功的获得了波长为820nm带的高光束质量单横模光纤激光，最大输出功率达到1W，光—光转换斜率达到15.7％，从而在一定程度上使Ti：S激光器具有光纤激光器的方便性。稀土掺杂光纤激光器研究 5、基于E尸十:Yb3+共掺双包层光纤激光器的理论模型，在数值分析的基础上，利用两种E尸十:Yb3十共掺双包层光纤，研制成功了Er3+:Y宁十共掺双包层光纤激光器，在波长约1565nln处分别获得了输出功率3.SW的多模和2.ZW的单模激光，这是目前国内用Er3+:Yb3+共掺双包层光纤所获得的最高功率。关键词:稀土掺杂光纤;双包层光纤;光纤激光器;光纤激光理论;钦宝石激光器更多还原

【Abstract】 Due to the potential applications of rear-earth doped fiber lasers in many fields and the tendency they have shown to gradually replace the traditional high power lasers, researches on the theory and new technology of rear-earth doped fiber lasers, such as 3 jam and 2 m cascaded Ho3+:ZBLAN fiber laser, Tm3+:Ho3+ co-doped silica fiber laser, and Er3+:Yb3+ co-doped double cladding fiber laser, not only have important scientific values, but also be helpful for the development of medicine, communication, military, and industry machining fields.The main research works and innovations of this dissertation are summarized as follows:Firstly, based on the operation principles of the 3 m and 2 m cascaded Ho3+:ZBLAN fiber laser, the dynamic and steady state rate equations, as well as the power propagation equations along with the corresponding boundary conditions of this 3 m and 2 m cascaded Ho3+:ZBLAN fiber laser pumped by at 1.1 /urn band are given for the first time in domestic, which result in a relatively complete theoretical model. Then numerical analysis of both the dynamic and steady state characteristics of the 3 m and 2 m cascaded Ho3+:ZBLAN fiber laser is performed. The analysis shows that cascade oscillation of the Ho3+:ZBLAN fiber laser can produce 3 m and 2 m laser beams with high conversion efficiency, and it is easy to achieve cascaded oscillation.Secondly, the first domestic experimental research on the 3 m and 2 m cascaded Ho3+:ZBLAN fiber laser is carried through. Very week cascaded radiations at about 2920 nm and 2040 nm have been generated.Thirdly, the mechanism of the Tm3+:Ho3+ co-doped silica fiber laser to produce 2m region radiation is investigated for the first time in domestic, and steady state numerical analysis is performed for each situation after the theoretical models of Tm3+:Ho3+ co-doped silica fiber laser pumped at 796 ran or 1180 ran laser is built. Then, experimental research on the Tm3+:Ho3+ co-doped silica fiber laser is carried through for the first time in domestic, pumped by a 796 ran Ti:S laser or a 1180 ran Raman fiber laser, respectively. A maximum output power of 930 mW at central wavelength of 1880 ran was achieved with an optical to optical conversion efficiency of 30% when the fiber length is 1 m, which was due to the transition of Tm ions. By contrast, the maximum output power decreased to 650 mW but central wavelength shifted to 1960 ran, due to contribution of the Ho ions transition when the cavity length increased to 3 meters.Fourthly, by using Ti:S laser as the pump source and using Ti:S laser cavity combined with a piece of Tm:Ho co-doped single-mode silica fiber to form a compound cavity, high beam quality 820 ran band single transverse mode laser is produced for the first time by frequency-selecting with Tm:Ho co-doped fiber as the external cavity. The maximum output power of 1 W is achieved with an optical to optical conversion efficiency of 15.7%, which could make the Ti:S laser have the convenience of optical fiber laser to some extent.Lastly, steady state numerical analysis is performed for the Er3+:Yb3+ co-doped double cladding fiber laser after the theoretical model is built. By using two kind of Er3+:Yb3+ co-doped double cladding fiber, two Er3+:Yb3+ co-doped double cladding fiber lasers are developed with maximum output power of multimode 3.5 W and single mode 2.2 W at about 1565 ran, respectively, which are the highest output power obtained from the Er3+:Yb3+ co-doped double cladding fiber in domestic.更多还原