【作者】 李慧；

【导师】 高春清； 彭钦军；

【作者基本信息】 北京理工大学 ， 电子科学与技术， 2015， 硕士

【摘要】 1.3μm波段激光在激光医疗、光谱学、光纤通信系统、军事和倍频红光等方面有有重要的应用前景，近年来成为激光研究的热点。而27Al+光频标的发展迫切需要波长精度高、线宽窄、稳定性好的1336.632nm激光器，本论文主要致力于该方面的研究。Nd:GYSGG晶体作为一种新型的晶体材料，具有很多优点，如有效分凝系数大，荧光寿命长等，我们选用它作为增益介质来产生1336.6nm激光，本论文的主要研究内容如下：1.研制成功1336nm窄线宽Nd:GYSGG扭转模激光器。基于准连续808nm LD侧面泵浦Nd:GYSGG晶体结构，电源脉冲重频为10Hz，脉冲宽度为1ms，采用两个λ/4波片和55.4°偏振片结合来消除光场在增益介质中的驻波分布，从而获得单波长激光输出，并用双折射滤光片和0.3mmFP标准具调谐，在平均泵浦功率为47W时，获得了1.848W的1336.46nm激光输出。2.根据相关文献的理论基础确定了损耗差的计算方法，通过Matlab和Solidworks软件完成单块非平面环形腔的设计。3.首次研制成功1336.6nm窄线宽声光调Q Nd:GYSGG环形激光器。基于准连续808nm LD侧面泵浦Nd:GYSGG晶体结构，电源脉冲重频为10Hz，脉冲宽度为1ms，在42.3W的平均泵浦功率下，首次获得最大平均输出功率367mW的1336.6nm可调谐激光输出，在该功率处的线宽为0.85pm，脉宽和重频分别为300ns和80Hz，对应的平均平均峰值功率为15.3kW。更多还原

【Abstract】 Lasers operating at1.3μm have received a large amount of interest in recent years since theirpromising range of applications in laser medicine, spectroscopy, fiber communications system, themilitary and frequency-doubled red lasers, etc. The development of27Al+optical frequency standardurgently needs1336.632nm lasers with high wavelength accuracy, narrow linewidth and goodstability. T which this paper is mainly devoted to this. As a new laser material, Nd:GYSGG crystalhas many merits. For example, its effective segregation coefficient is high, which can be easier toobtain high concentration and homogeneous doping crystal; besides, its fluorescent lifetime is long,so it was can be adopted as an gain medium for1336.6nm laser. The main contents of this thesisare included as follows:1. We successfully developed the narrow linewidth1336nm Nd:GYSGG laser with twistedmode cavity. The Nd:GYSGG rods were side pumped by808nm quasi continuous wave diodelasers with1ms pulse width and a pulse repetition frequency of10Hz. The combination of Twoquarter waveplates and a55.4°polarizer can eliminate standing-wave distribution in the gainmedium, and so as to obtain single wavelength laser output, the birefringent filter and0.3mm FPetalon were used here for wavelength adjusting. a maximum average output power of1.848W at1336.46nm was achieved under the average pump power of47W.2. The calculate method of loss difference was obtained through related literature, and wecompleted the design of monolithic nonplanar ring oscillator through matlab and solidworks.3. A narrow linewidth acousto-optic Q-switched Nd:GYSGG ring laser at1336.6nm wasinitially developed. The Nd:GYSGG rods were side pumped by808nm quasi continuous wavediode lasers with1ms pulse width and a pulse repetition frequency of10Hz. With an incidentpump power of42.3W, a maximum average output power of367mW at1336.6nm withlinewidth less than0.85pm and a pulse width of300ns was obtained at a repetition rate of80Hz, corresponding to an energy peak power of15.3kW.更多还原