基于菲涅耳棱镜干涉的飞秒激光脉冲测量

菲涅耳棱镜干涉是大学物理课程光的干涉中一个经典而重要的实验,菲涅耳棱镜干涉的物理思想与实验方法至今仍然值得我们学习与借鉴。本文利用菲涅耳棱镜的干涉原理并与柱面透镜、非线性晶体、CCD相结合搭建了用于测量飞秒激光脉冲的自相关装置,这种自相关装置结构简单、方便,成本极低;分析了这种基于菲涅耳棱镜自相关装置的工作原理,并进行了实验测量。     

Diode End-Pumped Passively Q-Switched Nd^3＋：GdVO4 Self-Raman Laser at 1176 nm

A compact diode-end-pumped passively Q-switched Nd^3＋ ：GdVO4/C^r4＋ ：YAG self-Raman laser at 1176 nm is demonstrated. When the To = 80% Cr^4＋：YAG saturable absorber is inserted into the cavity, the maximum Rtaman laser output reaches 175 mW with 3.8 W incident pump power. The optical conversion from incident to the Raman laser is 4.6% and the slope efficiency is 6.5%. The pulse energy, duration, and repetition frequency of the first stokes laser are 4.5μJ, 1.8 ns, and 38.5 kHz, respectively. There is strong blue emission （about 350- 400nm） can be observed in the Nd^3＋ ：GdVO4 crystal when the process of stimulated Raman scattering occurs, which is induced by the upconversion of the Nd^3＋ ions.     

连续锁模Nd∶YVO4激光器实现1 GHz高频输出

LD抽运全固体Nd∶YVO4激光器在连续锁模状态运转下获得了高达1 GHz的重复频率.实验中采用半导体可饱和吸收镜作为锁模元件.利用透过率只有0.8%的输出镜以及可获得较小抽运光斑的2 WLD作为抽运源来优化激光器设计,有效地抑制了调Q锁模状态的运转.低的激光器振荡阈值(35 mW)和连续锁模阈值(0.8 W)显示了饱和吸收体低的插入损耗和激光器合理的设计.在最大抽运1.6 W 时获得了210 mW的平均输出功率.     

Compact, Low Threshold Nd^3＋：YVO4 Self-Raman Laser at 1178 nm

A compact low-threshold Raman laser at 1178 nm is experimentally realized by using a diode-end-pumped actively Q-switched Nd^3＋ ：YVO4 self-Raman laser. The threshold is 370mW at a pulse repetition frequency of S kHz. The maximum Raman laser output is 182 m W with the pulse duration smaller than 20 ns at a pulse repetition frequency of 30kHz with 1.8 W incident power. The optical efficiency from the incident power to the Raman laser is 10% and the slope efficiency is 13.5%.     

BIBO腔内和频593 nm激光器

采用激光二极管纵向泵浦Nd∶YVO4晶体，用一个线性平凹腔实现了1064 nm和1342 nm双波长连续波振荡，经BIBO腔内和频得到了593 nm的激光输出.当泵浦输入功率为1.4 W时593 nm激光输出功率为48.5 mW. 593 nm激光功率的均方根稳定性＜2.0%，光斑椭圆度为0.90，峰-峰值噪音小于0.5%.     

法布里-珀罗干涉在超短激光脉冲测量中的应用

把大学物理光学中法布里-珀罗干涉的方法应用于超短激光脉冲测量.分析了利用法布里-珀罗标准具中多光束干涉产生自相关信号进行超短激光脉冲测量的原理;进行了实验测试并与迈克耳孙干涉自相关的测量结果进行了对比,实现了对超短激光脉冲时间宽度的测量.     

外腔式宽调谐被动调QNd:YVO_4/PPMgLN光学参量振荡器

报道了一个低阈值宽调谐、被动调Q、单谐振掺MgO的周期性极化铌酸锂晶体(PPMgLN)光学参量振荡器。利用被动调Q的Nd:YVO4激光器作为泵浦源,采用外腔结构,在室温下,实现了PPMgLN晶体的准相位匹配光学参量振荡。光参量振荡的阈值仅为0.27W(单脉冲能量4.5μJ、脉宽35ns);在泵浦光为1.35W(脉冲能量8.2μJ、脉宽35ns),PPMgLN周期为31μm时,获得了161.9mW,3.202μm脉冲激光输出;同时获得了98.5mW的1.594μm信号光输出,总的光光转化效率达到19.3%。通过改变晶体的周期,实现了闲频光3.13～4.19μm,信号光1.43～1.65μm的宽带可调谐激光输出。