窄线宽脉冲全固态蓝光激光器技术研究
文献类型：学位论文
| 作者 | 戎善奎 |
| 学位类别 | 博士 |
| 答辩日期 | 2008 |
| 授予单位 | 中国科学院上海光学精密机械研究所 |
| 导师 | 陈卫标 |
| 关键词 | 全固态钛宝石激光器 单频蓝光激光器 种子注入 正交倍频 和频 |
| 其他题名 | Research of Narrow Line-width Pulsed All Solid-state Blue Laser |
| 中文摘要 | 全固态蓝光激光器因具有波长短、体积小、结构紧凑、效率高、运转可靠等一系列优点，不仅在数据存储、激光高速印刷等很多民用领域有着广泛的应用，而且在水下激光通信、海洋探测以及差分吸收雷达（DIAL）系统中具有较大的应用潜力。另外，与原子滤波器相匹配的单频蓝光激光器被认为是实现激光对水下目标通信的最佳波段。为此，本文重点开展了基于钛宝石的窄线宽脉冲全固态蓝光激光器的技术研究，包括钛宝石激光器特点、谐振腔设计、线宽压窄技术等基本理论阐述，以及高效率绿光泵浦源、种子注入的窄线宽全固态钛宝石激光器、非线性光学频率变换获得蓝光激光等实验研究。 论文首先对钛宝石激光器以及钛宝石激光器输出激光的非线性光学频率变换的研究作了回顾；阐述了钛宝石激光器外腔种子注入压窄线宽等相关理论，为进行钛宝石激光器以及蓝光激光的实验研究确定了方案。 第二，研制了一套全固态倍频Nd:YAG激光器作为钛宝石激光器的泵浦源，采用侧面泵浦、电光调Q和振荡放大方式。重点探讨了采用正交倍频的方法，实现Nd:YAG 激光器高效倍频输出。在脉冲能量125mJ，重复频率10Hz的基波，利用正交KTP倍频后，可得94.6 mJ的532nm绿光输出，转换效率达到了75.5%。同时讨论了基波光束质量对于倍频效率的影响，并进行了实验对比。这种倍频方法对于较差的基波光束质量条件下的二次谐波转换也可获得较高的效率，同时倍频装置结构简单，不会对激光系统的结构紧凑性有太大影响，对于获得高效率，高功率的全固态蓝绿激光器具有一定的参考价值。 第三，研制了910nm的全固态窄线宽钛宝石激光器。分别采用全固态Nd:YAG激光器经倍频后获得的532nm绿光泵浦两镜直腔和四镜环形腔钛宝石激光器，比较了采用不同腔型以及不同输出透过率时的输出能量、光谱以及脉宽等特性。在腔内插入双折射滤光片进行模式的粗选并结合外腔种子注入，获得了910nm窄线宽激光输出。在泵浦源重复频率10Hz，脉宽10ns，单脉冲能量最高为110mJ时，种子注入后，两镜腔和环形腔钛宝石激光器可获得6.8mJ和11.73mJ的窄线宽钛宝石激光输出。另外进行了脉冲钛宝石激光器种子注入的稳频实验研究，采用反馈信号控制压电陶瓷进而控制腔长的方式实现种子注入钛宝石激光器的长时间稳定运转。 最后介绍了全固态钛宝石激光器通过非线性光学频率变换获得蓝光输出的实验研究。论文讨论了两种蓝光生成方法：首先利用和频方式获得蓝光激光的实验，采用Nd:YAG激光器输出的1064nm激光与外腔种子注入的钛宝石激光器输出的774.56nm激光进行和频，获得脉冲能量6mJ的448nm激光；对种子注入的钛宝石激光器输出的910nm激光进行了倍频实验研究，获得了窄线宽，窄脉宽的455nm蓝光激光，在基波11.73mJ时，倍频后得到3.43mJ的455nm蓝光，对应的倍频效率为29.2%。虽然910 nm倍频产生蓝绿的方式效率较低，但是激光运转稳定，更加有利于研制实用化的器件。 本论文开展单频蓝光全固态激光器所取得的结果，可以为制定高功率的、实用化器件的技术路线奠定基础，从而发挥其在水下激光应用潜力。 |
| 英文摘要 | All solid-state blue lasers have been widely used in data storage, high-speed laser printing, atmospheric montoring differential absorption lidar(DIAL) and underwater communication and detection due to the merits of short wavelength, compact structure, high efficiency, reliable operation, and so on. Signle frequency blue laser which is matched with the center wavelength of atomic filter is paied attentation to in the application of underwater laser communications. Therefore, a narrowband, pulsed all-solid-state bule laser with Ti:Saphhire is focused in this dissertation. This dissertation is consisted of study of the characteristics of Ti:Sapphire laser, design of resonator cavities, method of narrowing line-width, the experiment of pumped laser, performance of different cavities and blue output with nonlinear conversion. The characteristics of Ti:sapphire lasers and its nonlinear optical frequency conversion are reviewed fistly; Theories of narrowing the linewideh of Ti:sapphire laser with the external cavity injection-seeding and other techniques are analyzed; The scenario of this study is determined. Secondly，an all solid-state，frequency-doubled all solid-state laser used as the pump source of Ti:sapphire laser is developed with configuration of side pumped, EO Q-switched and MOPA. Quadrature frequency doubling method is emphasized in order to get high frequency doubling efficiency. Pulse energy of 94.6 mJ at 532nm wavelength is output with KTP crystal’s quadrature frequency doubling at the foudamental energy of 125mJ and repetition rate of 10Hz, which is corresponding to the conversion efficiency as high as 75.5%. At the same time, the effect of doubling efficiency for different beam quality of fundamental laser is discussed and the corresponde experimental comparison is caried out. The results shows that high second harmonic conversion efficiency can be obtained even with a little poorer beam quality of fundamental laser. This method can be promoted in the developing of high energy green all solid-state laser for its simple structure. Thirdly, an all-solid-state, narrow line-width 910nm Ti:sapphire laser’s prototype is developed. It is pumped by the above all solid-state frequency doubled Nd:YAG laser. Two different lasers with linear cavity and ring cavity is studied. The output performances such as energy, pulewidth, spectra are comparied, respectively. Narrow line-width at 910nm is obtained with the combination techniques of injection seeding and birefringent filter(BF) inside cavity. Output energy of 6.8mJ and 11.73mJ with narrow line-width for linear and ring Ti:Sapphire laser is obtained at pumping laser with the energy of 110mJ, the pulse width of 10ns and the repetition rate of 10Hz, repsctively. In addition, the injection-seeded Ti:sapphire laser frequency stabilization experimental is implemented for its long-term operation. Finally, the blue laser from nonlinear optical frequency conversion of Ti:sapphire laser is studied. Two methods of frequency doubling and frequency mixing are analyzed: Experiment of frequency mixing between 1064nm laser and 774.56nm laser (Ti: Sapphire) using BBO crystal is implemented, and the pulse energy of 6mJ laser at wavelength of 448nm is obtained. While the high time synchronization between two lasers is needed; therefore, the reability of operation is limited. Narrow line-width of 455nm blue laser can be generated through frequency doubling of the injection-seeded Ti:sapphire laser at 910nm. 3.43mJ of 455nm laser at the fundamental energy of 11.73mJ is obtained, which is corresponding to frequency doubling efficiency of 29.2%. Though the whole efficiency is lower than that of frequency mixing, the stability is better. The narrow linewidth, all-solid-state blue laser developed in this dissertation is very useful to determine the roadmap of developing the practical, high power bule laser. This kind of laser will have great potential application for underwater communication. |
| 语种 | 中文 |
| 源URL | [http://ir.siom.ac.cn/handle/181231/15242]  |
| 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 | 戎善奎. 窄线宽脉冲全固态蓝光激光器技术研究[D]. 中国科学院上海光学精密机械研究所. 2008. |
入库方式： OAI收割
来源：上海光学精密机械研究所
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