皮秒薄片激光相关技术研究
文献类型：学位论文
| 作者 | 陆俊 |
| 文献子类 | 博士 |
| 导师 | 冷雨欣 |
| 关键词 | 薄片激光器 thindisk laser 高重复频率 high repetition rate 被动锁模 Passive mode-locked 啁啾脉冲放大 chirped pulse amplification 突发模式 burst mode |
| 其他题名 | Research on picosecond thindisk related technology |
| 英文摘要 | 薄片激光器的主要特点是激光增益介质的厚度比较薄，一般在几百个微米 左右，其主要优点在于在激光增益介质内允许非常高的泵浦功率密度，而不会有 太高的温升。在端面泵浦的平顶泵浦光束作用下这种结构可以产生垂直于薄片激 光增益介质表面、几乎均匀的轴向一维热流, 因而可以减小热透镜效应和增益介 质中的热沉积, 使得在获得高功率激光输出同时, 保持高效率和高光束质量。 结合宽带激光增益介质，薄片激光器可以获得短脉冲宽度，高平均功率和高重复 频率等特点的激光脉冲输出。因此短脉冲（如皮秒脉宽）的高功率薄片激光在科 学研究、工业应用、医疗等领域展具有重要应用前景，而皮秒高功率薄片激光相 关技术研究也成为国内外研究的一大热点。 本论文主要基于薄片激光技术，开展了皮秒超短脉冲高功率激光技术研究， 包括锁模脉冲产生和放大技术，以及脉冲进一步压缩技术研究等，取得的主要研 究成果如下： 1. 研究了基于MoS2 可饱和吸收体的Yb:YAG 被动锁模技术。将采用低压气相沉 积法制备的单层MoS2 作为可保和吸收体应用于Yb:YAG 薄片激光振荡器，通 过振荡腔优化，获得了最高功率890mW、重复频率48.6MHz、脉冲宽度13.1ps、 单脉冲能量18.3nJ 的锁模激光脉冲输出。 2. 研究了基于Yb:YAG 薄片激光器的啁啾脉冲放大技术。使用钛宝石振荡器作为 种子源，通过设计再生放大腔，结合啁啾脉冲放大技术以及薄片激光技术， 获得了最高输出功率14W、重复频率500Hz-5kHz 可调的皮秒激光脉冲输出。 3. 研究了基于Yb:YAG 薄片激光器的突发模式脉冲放大技术。通过设计长度接近 9m 的长腔，在一个脉冲放大周期内获得了对5 个脉冲的放大输出，结合treacy 压缩器最终获得了平均功率10.7W、光谱半高全宽1.18nm、脉冲半高全宽 777fs 的双曲正割脉冲串输出。 4. 结合Yb:YAG 薄片激光器输出和基于充气空心光纤脉冲压缩技术，研究了皮秒 脉冲的非线性脉冲压缩。分析了不同空心光纤参数和脉冲啁啾对脉冲压缩特 性的影响。通过模拟可知，使用直径600μm、气压6bar、长度1.8m 的空心光 纤配合啁啾镜对补偿脉冲的冗余色散，可以将20mJ/1.9ps 的入射脉冲压缩到 31.5fs 左右。; The main characteristic of thin-disk lasers is that the thickness of the laser gain medium is relatively thin, typically around several hundred micrometers, and its main advantage is that very high pump density is allowed in the laser gain medium without too much temperature rise. This structure can produce a nearly one-dimensional axial heat flow perpendicular to the surface of the gain medium under the pump of a top-hat profile pump laser, which will reduce the thermal lens effect and the thermal deposition in the gain medium while achieving high power laser output with high efficiency and high beam quality. Combined with broadband laser gain material, thin-disk lasers can obtain a pulse with short pulse duration, high average power and high repetition rate. Therefore, short pulse(such as picoseconds pulse duration) high-power thin-disk laser has important application prospect in scientific research, industrial application, medical field and so on. Picosecond high-power laser related technology has become a hot topic all around the world. Based on thin-disk laser technology, this paper concentrated on the research of picosecond ultrashort high power laser technology, including the mode-locked pulse generation and amplification technology, as well as the further compression technology of short pulse, the main research results are as follows: 1. The Yb: YAG passive mode-locking technique based on MoS2 saturable absorber is studied. The mono-layer MoS2 prepared by low-pressure vapor deposition method was used as the saturable absorber for the Yb: YAG thin-disk laser. The maximum output power, repetition rate, pulse duration and pulse energy are 890mW, 48.6MHz, 13.1ps, 18.3nJ, respectively. 2. Chirped pulse amplification technology based on Yb: YAG thin-disk laser is investigated. By using the Ti: sapphire oscillator as the seed, a picosecond laser with the highest output power of 14W and the repetition rate of 500Hz-5kHz is obtained by designing the regenerative cavity combined with the chirped pulse amplification as well as the thin-disk laser technology. 3. Burst mode amplification technology based on Yb: YAG thin-disk laser is investigated. Through the design of a 9m long cavity, we obtained five pulses output in one amplification cycle, combined with treacy compressor, a pulse sequence with average power of 10.7W, spectral bandwidth of 1.18nm and pulse duration of 777fs was obtained. 4. Based on the Yb: YAG thin-disk laser output and the hollow core fiber compression technology, the nonlinear pulse compression of picosecond pulse is investigated. The effects of different fiber parameters and pulse chirp on pulse compression are analyzed. Through simulation, we can concluded that by introducing a hollow core fiber with diameter of 600μm, pressure of 6bar and length of 1.8m together with chirped mirrors to compensate for the redundant dispersion of the pulse, a pulse with pulse duration of 31.5fs can be obtained with input pulse of 20mJ/1.9ps. |
| 学科主题 | 光学 |
| 源URL | [http://ir.siom.ac.cn/handle/181231/31020]  |
| 专题 | 中国科学院上海光学精密机械研究所 |
| 作者单位 | 中国科学院上海光学精密机械研究所 |
| 推荐引用方式 GB/T 7714 | 陆俊. 皮秒薄片激光相关技术研究[D]. |
入库方式： OAI收割
来源：上海光学精密机械研究所
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