【作者】 杨峰；

【导师】 王月珠；

【作者基本信息】 哈尔滨工业大学 ， 物理电子学， 2006， 硕士

【摘要】 种子光注入作为一种获得高能量,高光束质量激光的技术,在激光相干测风雷达、差分吸收雷达等多方面有很重要的应用。本论文主要就种子光注入激光器进行了系统的研究。首先对种子光注入技术进行了理论分析,作为种子光注入技术的理论基础。由于种子光的特性直接影响到整个激光器系统的输出,所以获得高光束质量的种子光源就非常重要,实验中我们采用平凹腔微片激光器作为种子光源,经优化实验参数,获得最大能量为35mW的单模激光,光光转化效率为2.3%。接着从稳定性上分析了作为功率腔的环形腔结构,根据分析结果搭建了0.74m到1.2m的多个腔长,通过比较得到最优腔长,并在0.96m腔长,频率为200Hz时获得脉宽196ns,单脉冲能量3.5mJ的输出。最后把种子光注入环形腔,由于损耗严重,没有达到种子光注入锁定振荡阈值,产生频率锁定放大。在种子光注入实验中,在50mW多模种子光情况下,在腔内侧得结果为5mW,损失近90%,而理论最少应损失80%。因此为达到腔内10mW的注入单模能量,需要输出单模种子光80mW。如果在环形腔内进行调Q,在关断环形腔后,进行种子注入,压制腔内自发噪声的场的分布,这时,注入的种子光会起比较明显的作用,同时所需要的种子光能量也会降低。最后根据不足,提出了一些解决方案。更多还原

【Abstract】 Injection seeding is one of the technologys of developing a high energy and high beam quality light soure, with important application in coherent Doppler lidar, differential absorption lidar(DIAL) and so on. The paper principally discusses the system of laser injected seed.At first, analyzes the injection seeding theorily, so the system based on this. For the parameter of the seeding influence directly the output of the laser system,so getting the suitable master laser be important. We utilize plano-concave cavity and microchip laser to be the seeding, optimize the laser parameter, get 35mW of single frequency output, and an optical to optical efficiency of 2.3%. we then analyze the stability of the ring laser cavity configuration and structure the cavity with length range of 0.74m and 1.2m, get the optimal length of the 0.96m, at pulse repetition rate of 200Hz, wiht a pulse width of 196ns, a pulse energy of 3.5mJ. After all, we inject the seeding to the ring laser, because of the loss, can’t to be the threshold of the slave laser. In the experiment of the seeding, we get 50mW output of multi-frequency, and get 5mW in the ring cavity, losing 90%, but the best loss is 80%. If we get 10mW in the ring cavity, we must need 80mW single frequency output. But, if we Q-switch in the ring laser, and after the break off of the Q-switching, we inject the seeding, then we only offer smaller power to match the require. At last we offer the advise.更多还原