| 题名 | 全固态高重复率电光调Q绿光激光器特性研究 |
| 作者 | 唐昊 |
| 学位类别 | 硕士 |
| 答辩日期 | 2009 |
| 授予单位 | 中国科学院上海光学精密机械研究所 |
| 导师 | 朱小磊 |
| 关键词 | 全固态绿光激光器 高重复率 电光调Q 热效应 |
| 其他题名 | Study on All-Solid State Green Laser with High Repetition Rate of Electro-Optic Q-switcher |
| 中文摘要 | 激光二极管（LD）泵浦的全固态激光器（DPSSL）具有转换效率高、光束质量好、使用寿命长、结构紧凑等优点，在生产、生活各个方面都发挥着重要作用，尤其是高重复率窄脉宽固体绿光激光器(DPSSGL)在科研、医疗、工业、军事等领域都有着广阔的应用前景和巨大的市场需求。而在全固态脉冲绿光激光器中，利用电光Q开关容易获得10ns以下的稳定窄脉冲输出，但由于驱动源和调Q晶体本身性能、制备方面的限制，目前对电光调Q绿光激光器的研究报道还较少，而且报道的激光器输出重复率和功率都相对较低，因此研究高重复率窄脉宽的电光调Q绿光激光器是一项重要的、有实用价值的课题。 本文利用新型电光晶体La3Ga5SiO14 (LGS)作为调Q元件，采用I类临界相位匹配切割的LiB3O5 (LBO)作为倍频晶体，同时为了便于空间应用，采用TEC传导冷却的方式，对高重复率电光调Q绿光激光器进行了系统的研究。论文第一章对全固态高重复率绿光激光器的发展历程和发展趋势进行了概述，并提出本论文的研究方向和研究内容。第二章阐述了电光调Q原理和倍频理论，同时对全固态电光调Q绿光激光器关键技术进行了分析。第三章分析了激光器的热效应，并针对实验目的和实验条件，设计出高效稳定的直线型和V型谐振腔，分别为高重复率电光调Q基波1064nm激光器和谐波532nm绿光激光器的实验研究做准备。第四章为1Hz～30kHz重复率下电光调Q 1064nm激光器输出特性的实验研究，利用LGS晶体和RTP晶体，在重复频率为30kHz时，分别获得了单脉冲能量0.21mJ、脉宽9.1ns和单脉冲能量0.23mJ、脉宽7.8ns的1064nm调Q输出，斜率效率分别为32.7%和34.9%。第五章为1Hz～30kHz重复率下LGS晶体电光调Q 532nm绿光激光器输出特性的实验研究，获得了最大平均功率2.5W、脉宽10.8ns的532nm绿光调Q脉冲输出。在重复频率为20kHz，输出功率为500mW时，M2<1.4。最后对全文进行了简单总结，指出论文中的不足之处并提出可能的改进方案。 |
| 英文摘要 | Laser diode pumped solid-state lasers(DPSSL) have played an important role in every aspects of daily production and life, due to their advantages, such as high conversion efficiency, high beam quality, long lifetime and compactness, especially the high repetition rate short pulsed solid state green lasers(DPSSGL) are promising and compellent in many applications such as scientific research, industrial, medical, and military fields, etc. In DPSSGL, stable short pulse that less than 10ns can be obtained using EO Q-switch, but at present, EO Q-switched DPSSGL has hardly been reported, and usually the repetition rate of EO Q-switch is not very high due to the performance of EO crystal and the limit of the HV drivers, so it is an important and valuable subject to research high repetition rate short pulsed EO Q-switched green laser. In this paper, an in-depth study about high repetition rate EO Q-switched diode pumped solid state laser is introduced. A block of La3Ga5SiO14 (LGS) single crystal is used as a Q-switch and the type I phase-matching LiB3O5 (LBO) is used as the nonlinear crystal in the second harmonic generation, and TEC conduction cooling method is used for the space utilization of laser. In chapter 1,the progresses about all solid state green lasers are summarized, and the main content of my study is introduced. In chapter 2, the principle of EO Q-switching and second harmonic generation are expounded, and the key point of EO Q-switched green laser is analyzed. In chapter 3, the thermal effect of solid state lasers is analyzed, and two stable straight line cavity and V-type cavity, which prepare for the high repetition rate EO Q-switched 1064nm laser and 532nm laser experimental study respectively, are designed by Lascad according to the experimental objective and condition. In chapter 4 , the experimental study of high repetition rate (1Hz~30kHz) EO Q-switched 1064nm laser is introduced in detail, using LGS Q-switch and RTP Q-switch, in the repetition rate of 30kHz, the pulse energy of 0.21mJ with the pulse width of 9.1ns and 0.23mJ with pulse width of 7.8ns are obtained, the slope efficiency are 32.7% and 34.9%, respectively. In chapter 5, the experimental study of high repetition rate (1Hz~30kHz) LGS EO Q-switched 532nm green laser is introduced in detail, the 2.5W average power with the pulse width of 10.8ns is obtained. When output power is about 500mW at the repetition of 20kHz, the beam quality factor M2 is less than 1.4 in both orthogonal directions. In chapter 6, we make a brief summary of all the work done, then indicate the shortage of the work and give some suggestions for further improvement. |
| 语种 | 中文 |
| 内容类型 | 学位论文 |
| 源URL | [http://ir.siom.ac.cn/handle/181231/16414]  |
| 专题 | 上海光学精密机械研究所_学位论文 |
| 推荐引用方式 GB/T 7714 | 唐昊. 全固态高重复率电光调Q绿光激光器特性研究[D]. 中国科学院上海光学精密机械研究所. 2009. |
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