节点文献
全固态宽带可调谐光学参量发生器的理论与实验研究
【作者】 刁述妍；
【导师】 姚建铨；
【作者基本信息】 郑州大学 ， 材料学， 2007， 博士
【摘要】 光学参量发生器作为可调谐相干光源，拓宽了激光输出波长范围，在光谱学、医学、科学研究、军事等领域获得了广泛应用。随着非线性材料加工技术和激光技术的发展，光学参量产生器、振荡器和放大器的种类越来越多、转换效率越来越高、应用范围越来越广，特别是红外人眼安全波段的中红外光学参量振荡器已进入实用阶段。作者在河南省重点科技攻关计划基金项目(0223024900)资助下，进行了准相位匹配温度调谐光学参量振荡器和光学参量产生器的理论与实验研究工作。本文理论上对光学参量发生器的物理机制、调谐方法、允许参量等进行了详细的分析和计算；实验上对光学参量发生器的泵浦源进行了研究，实现了1064nm泵浦的全固态温度调谐PPMgLN光学参量产生器和光学参量振荡器的宽带、红外可调谐参量光的输出。本论文所做的主要工作如下：1、对准相位匹配光学参量发生器的角度调谐、泵浦波长调谐、周期调谐和温度调谐四种调谐方式的调谐特性和调谐速率进行了系统的分析和计算，分别得到了四种调谐方式下计算输出波长与调谐速率之间关系的精确公式，并得到了它们的关系曲线。2、对准相位匹配光学参量发生器的允许周期、允许温度、允许角度、允许泵浦光波长和允许参量光波长进行了分析和计算，分别得到了五个允许参量公式，并得到了输出波长与允许参量之间的关系曲线。3、对晶体角度调谐光学参量振荡器进行了理论研究。分别从信号光单谐振和空闲光单谐振两种情况出发，推导和计算了输出信号光波长与调谐角的关系、晶体角度调谐的允许角和调谐速率，首次得出近轴条件下的近似公式和它们之间的关系曲线，并对信号光单谐振和空闲光单谐振两种情况进行了分析和比较。4、对非共线准相位匹配的增益和输出参量光的允许波长进行了公式推导、分析和计算，得到了允许信号光波长的精确公式和关系曲线。得出，在相同条件下，非共线相互作用的增益将比共线相互作用的增益大大减小；非共线比共线相互作用有更大的允许波长。5、对光学参量发生器的泵浦源进行了理论与实验研究。在详细研究了调Q激光器的原理与输出特性的基础上，确定了用1064nm声光调QNd：YAG激光器作为泵浦源的方案。6、克服了传统周期极化晶体光损伤阈值低的缺点，实现了连续、宽调谐、稳定的红外参量光输出，并获得了基于掺氧化镁周期极化铌酸锂晶体温度调谐光学参量产生器样机一台。该项目于2005年11月通过省内外专家鉴定，并荣获2006年度河南省信息产业科技成果壹等奖。
【Abstract】 By virtue of broadening the spectrum of laser output wavelength, the optical parametric generator as a tunable and coherent light source, has been widely used in the fields of spectroscopy, medicine, scientific research, and military affairs. Along with the development of nonlinear material processing technology and laser technology, optical parametric generators, oscillators and amplifiers have been more and more varied in kinds, efficient in conversion, and largely used in scope. In particular, the middle infrared optical parametric oscillator in the infrared wave band safe to human eyes has entered the phase of actual use.The author of this dissertation has done some theoretical and experimental research work on temperature tuning QPM OPO and OPG which are supported by Henan province key science and technology attack plan and fund project (0223024900). This dissertation not only analyzes and calculates the physical mechanisms, tuning methods, and acceptance bandwidths of the optical parametric generator from a theoretical approach, but also acquires the wide infrared tunable parametric light output of the all solid state temperature tuning PPMgLN optical parametric generators and oscillators pumped by the 1064nm laser, after having conducted experimental research on pump source of optical parametric generators.The dissertation features the following points of main content. First, it conducts the formula deduction, analysis and numerical calculations of the tuning characters and tuning rates of four tuning modes of the quasi-phase matching optical parametric generators, namely, angle tuning, pump wavelength tuning, grating period tuning, and temperature tuning. The formula for calculating tuning rates and the curves are obtained respectively. Second, it conducts the formula deduction, analysis and numerical calculations of the acceptance bandwidths for period, temperature, angle of incidence, pump wavelength and the output parametric spectrum. The formula for calculating acceptance bandwidths and the curves are obtained respectively. Third, it conducts theoretical research on optical parametric oscillator of the crystal angle tuning. On the basis of the cases of signal-resonanted OPO and idler-resonanted OPO, the dissertation deduces and calculates the relationship between the output signal wavelength and the tuning angle, as well as the acceptance bandwidth for the angle and tuning rate of rotation angle of the crystal, with which to further analyze and compare signal-resonanted OPO with idler-resonanted OPO. The approximate formula in paraxial approximation and the curves are obtained respectively. Fourth, it conducts the formula deduction, analysis and numerical calculations of the noncollinear quasi-phase matching gains and the output parametric spectrum, which leads to the conclusions that under the same circumstances, the gains of noncollinear interaction will be much less than those of the collinear interaction, and consequently the noncollinear interaction possesses the larger acceptance bandwidths than that of the collinear interaction. The precise formula and the curve for calculating output signal spectrum are obtained respectively. Fifth, the pump source for the optical parametric generator is studied theoretically and experimentally. On the basis of detailed research on the characteristics of Q-switched laser, the 1064nm acousto-optically Q-switched Nd: YAG laser is selected as the pump source of the OPG Last but not the least, the defect of low damage threshold of the conventional periodically poled crystal is overcome. Widely and continuously tunable OPO and OPG are obtained and a temperature tuning optical parametric generator based on PPMgLN prototype is obtained. The project was highly appraised in November 2005 by famous experts and won the first prize for Henan province’s information industry scientific and technical payoffs in 2006.