| 基于LIDAR应用的全固化激光技术研究 | |
牛林全
| |
| 学位类型 | 博士 |
| 导师 | 孙传东 |
| 2013-11-20 | |
| 学位授予单位 | 中国科学院研究生院 |
| 学位授予地点 | 北京 |
| 学位专业 | 光学工程 |
| 关键词 | 全固化激光器 可饱和吸收体 微腔激光器 脉冲光纤激光器和放大器 Mopa |
| 摘要 | 激光器是激光雷达的核心，其性能指标直接决定了激光雷达的主要技术参数。基于脉冲测距体制的激光三维成像雷达是激光雷达的重要成员之一，要求激光器需具有高重复频率、窄脉冲、高光束质量、高效率和体积小、重量轻等特点。本论文针对激光三维成像雷达的应用，对半导体激光器（LD）泵浦的被动调Q微腔固体激光器和基于主振荡功率放大（MOPA）掺Yb3+脉冲光纤激光器进行了研究，并研制出MOPA脉冲光纤激光器工程样机，在激光三维成像雷达上进行了应用。 本论文的主要工作和创新结果包括以下几个方面：
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| 其他摘要 | Laser is the core of LIDAR, which has a great impact on the key parameters of LIDAR system. And 3D imaging LIDAR based on the pulse ranging mechanism plays an important role in the system of LIDAR, which is an active device in that it carries its own transmitter and does not depend on ambient radiation. As the transmitter of 3D imaging LIDAR, Laser must be required to some special characteristics, such as high repetition rate, narrow temporal duration, excellent beam quality, high efficiency, robust, and so on. This dissertation focuses on two kind laser technologies for the applications of 3D imaging LIDAR: a passively Q-switched microchip laser and Yb3+-doped pulse fiber amplifier based on MOPA structure. Meanwhile, the practical sample of pulsed all-fiber laser has been successful developed and applied to the 3D imaging LIDAR system. The main research works and innovations of this dissertation are summarized as follows: 1. Basing on the rate equations of Cr4+:YAG passively Q-switched laser, the output characteristics of pulsed laser as a function of two dimensionless variables are derived. According to the relationships, the laser parameters including pulse energy, peak power, pulse width, and laser efficiency are acquired by means of theoretical analysis and numerical simulation. It is useful to define the laser parameters when the anticipant pulse energy. 2. Single- and dual-pulse oscillation delivered from a LD pumped passively Q-switched Nd:YAG/Cr4+:YAG microchip laser has been investigated under the different pump levels. And the dual-pulse waveform consists of a main pulse and a satellite pulse with respective intensities and optical spectra. Experimental results indicate that the dual-pulse emission results from double longitudinal mode oscillation. The preponderant oscillating mode gives birth to the main pulse, and the other oscillating mode corresponds to the satellite pulse. 3. A compact high power nanosecond all-fiber MOPA system based on Yb3+-doped fiber amplifier system is established. Laser pulse with stable wavelength, controllable repetition rate and adjustable pulse duration is obtained. And the peak power is up to 123kW. As the transmitter of 3D imaging LIDAR, it is benefit to improve the capabilities of the entire system. Temporal duration and repetition rate of the laser pulse can choose flexible according to the different practical application. 4. The proposed fiber amplifier is used as the laser source of three-dimension (3D) imaging LIDAR system, which achieves the function of 3D imaging and gives the scanning imaging results. The performance of the laser is verified. The imaging results show that the proposed fiber amplifiers with high peak power have the excellent reliability and stability and are very suitable for 3D imaging LIDAR system. The imaging resolution is 4096×4096, the field of view is 40o×40o, and the ranging accuracy is about ±7.5cm |
| 学科领域 | 激光器 |
| 语种 | 中文 |
| 文献类型 | 学位论文 |
| 条目标识符 | http://ir.opt.ac.cn/handle/181661/21048 |
| 专题 | 研究生部 |
| 推荐引用方式 GB/T 7714 | 牛林全. 基于LIDAR应用的全固化激光技术研究[D]. 北京. 中国科学院研究生院,2013. |
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