基于新型材料的中红外固体激光技术研究
文献类型：学位论文
| 作者 | 邹晓 |
| 学位类别 | 博士 |
| 答辩日期 | 2016 |
| 授予单位 | 中国科学院上海光学精密机械研究所 |
| 导师 | 冷雨欣 |
| 关键词 | 中红外全固态激光技术、Cr:ZnSe/ZnS、掺铥晶体、过渡金属硫系化合物、超强超短激光脉冲 |
| 其他题名 | Mid-infrared soild-state laser technology based on new materials |
| 中文摘要 | 中红外（主要指2-5μm）激光不但覆盖了多个大气窗口（例如2-2.5μm和3.5-4μm）, 而且大部分小的有机分子或无机分子都在该光谱范围有较强的本征吸收线，因此被称为“分子指纹区”。此外，该波段还包含了水的吸收峰（~2μm和~3μm）和部分重要军事武器的特征辐射波长。这些重要的特征使得中红外激光在通讯、遥感、分子探测、军事、外科医疗等诸多领域都有着重要的应用价值和前景。此外，超强超短的中红外脉冲激光因具有更高的有质动力势，在强场高次谐波与阿秒科学等前沿物理研究领域有着巨大的应用前景。因此，发展新型的中红外固体激光技术已经成为国际上众多科研单位的研究工作热点之一。 本论文结合新型的中红外激光晶体和可饱和吸收材料，围绕中红外固体激光技术开展研究，特别对基于Cr:ZnSe/ZnS和掺铥晶体等新型晶体的固体激光技术、中红外大能量高功率激光泵浦技术、基于中红外增益介质的超强超短激光系统设计等方面进行了详细地研究。本论文主要取得了以下创新成果和研究进展： 1.首次验证了同带泵浦技术在Cr:ZnSe单晶和多晶激光器中的应用。在不同耦合输出镜透过率的条件下，利用同带泵浦技术都有效地了提高两种激光器的光学转换效率，并且降低了激光器的泵浦阈值。首次实验证实了，螺旋波导技术在Cr:ZnS多晶上的应用。实现了波导损耗<0.5dB/cm、光束质量因子接近1的高质量中红外波导激光输出。 2.首次以MoS2作为可饱和吸收体，研究了Tm:LLF晶体的调Q和锁模激光技术，获得平均功率>500mW、脉冲能量>40μJ、锁模频率为83.3MHz的2μm激光输出。首次利用MoS2、MoSe2、WS2、WSe2作为可饱和吸收体对Tm:YAP调Q和锁模激光器进行了实验研究，并详细地对比了四种锁模元件对Tm:YAP调Q锁模激光质量的影响。其中，MoSe2和WSe2更是首次实现了在全固态调Q和锁模激光器中的应用。 3.从调Q的基本原理出发，实验研究了Cr:ZnS多晶作为可饱和吸收体的Tm:YAP被动调Q激光技术。获得了2μm波段的脉冲激光输出，平均功率约1.32W、脉冲宽度约88.5ns、单脉冲能量约165μJ。该激光器的平均功率是目前以Cr:ZnS作为可饱和吸收体对掺铥晶体被动调Q激光器中的最大输出功率。 4.利用自主搭建的Nd:YAG放大器作为泵浦源，获得了1.57μm KTP-OPO的大能量高稳定性激光输出。最大输出能量约400mJ，在平均输出能量约200mJ的情况下，能量稳定性RMS值小于1%。基于KTP-OPO作为泵浦源，对增益开关式Cr:ZnSe激光器进行了详细地研究。获得了中心波长在2.4μm最大输出能量约9.38mJ，脉宽约2.1ns，峰值功率约4466 kW的中红外激光输出。该峰值功率是目前增益开关式Cr:ZnSe激光器报道的最高峰值功率。 5.从800nm超强超短拍瓦激光系统出发，提出了一种基于Cr:ZnSe晶体的800nm大能量高对比度种子源的设计方案。相比于目前的种子源系统，该方案具有大能量、高对比度、实用性高等一系列的重要优势。 |
| 英文摘要 | Mid-infrared(mainlyrefer to2~5μm) lasers were well known as "molecular fingerprint"region, because most small organic or inorganic molecule in the spectral range has a strong intrinsic absorption lines. Moreover, this spectral range also contain several atmospheric window(2~2.5μm and 3.5~4μm), water absorption peak (~ 2μm and ~ 3μm) and the radiation of some important military weapons.Due to these critical features, mid-infrared lasers show immense application value in the field of molecular detection, communications, remote sensing, military, medical and surgicalfield. In addition, due to higher ponderomotive potential, ultrashort mid-infrared lasers have a great prospect at the forefront of physics research in the field of attosecond science and strong field of high harmonics. Hence, development of new mid-infrared solid-state laser technologies has become one of the hot research works of many research institutions internationally . This thesis focuseson the mid-infrared solid-state laser technologies which arebased on new laser crystals and saturated absorber materials, including: mid-infrared solid-state lasers based onnew crystals and saturable absorbers, high energy mid-infrared laser pump technology, ultrashort mid-infrared laser system design were studied in detail. Themajor innovations and progress in this thesis arelisted as below: 1.For the first time to verify the advantages of in-band pumping technology in Cr: ZnSe single and polycrystalline crystallasers. Using different output coupling mirrors at different transmission conditions, the in-band pumping technology effectively raised the optical conversion efficiency of two kinds of laser, and reduced the pump threshold. For the first time to confirmexperimently the application of spiral waveguide technology in Cr:ZnS. The waveguide in this work was realized thetransmission loss of <0.5dB/cm and the high mid-infrared laser output beam quality factor of M2≈1. 2.For the first time to study Q-switched and mode-locked Tm: LLF laser technology with MoS2 as saturable absorber.The ~2μm laser was obtainedwith the average power> 500mW, pulse energy> 40μJ, mode-locked frequency of 83.3MHz. For the first time to use MoS2, MoSe2, WS2, WSe2 as saturable absorber for Tm: YAP Q-switched and mode-locked lasers. Detailed comparison of four kinds of Tm: YAP Q-switched mode-locked lasers were studied experimentally. Furthermore, MoSe2 and WSe2arethe first to use as saturable absorbersinthe all solid-state Q-switched and mode-locked lasers. 3.Starting from the basic principles of Q-switched technology, the detailed experimental study was researched in the Tm: YAP passively Q-switched laser technology with Cr: ZnS polycrystalline as saturable absorber. The ~2μm output pulsed laser has an average power of about 1.32W, pulse width of about 88.5ns, and single pulse energy of about 165μJ. At that time,the maximum averageoutput power wasthe highest among passively Q-switched thulium-doped crystals lasers with Cr: ZnS as a saturable absorber. 4.Based on the home-made Nd:YAG amplifier as the pump source, 1.57μm KTP-OPO laser was establishedwithhigh energy and high stability laser output. The maximum output energy is about 400mJ.In the case of an average of about 200mJ output energy, the energy stability of the RMS value of less than 1%. Based on KTP-OPO as the pump source, the gain selected Cr: ZnSe laser was studied in detail. The laser of center wavelength at 2.4μm was obtained to the maximum output energy of about 9.38mJ, the pulse width of about 2.1ns, the peak power of about 4466 kW in the infrared laser output. This peak power is the highest among the reported gain selected Cr: ZnSe lasers. 5.Studying from 800nm ??ultrashort Petawatt laser system, a new designwas proposedfor 800nm ??high energy and high-contrast seed sources. This new design was based on Cr: ZnSe crystal as gain medium. Compared to the current seed source systems, this program has a series important advantages of high energy, high contrast, and good practicality. |
| 语种 | 中文 |
| 源URL | [http://ir.siom.ac.cn/handle/181231/15995]  |
| 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 | 邹晓. 基于新型材料的中红外固体激光技术研究[D]. 中国科学院上海光学精密机械研究所. 2016. |
入库方式： OAI收割
来源：上海光学精密机械研究所
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