基于金纳米棒可饱和吸收体的脉冲激光器研究

发布时间：2018-05-01 05:13

本文选题：金纳米棒 + Nd:YSAG晶体　；参考：《山东师范大学》2017年硕士论文

【摘要】：被动调Q激光器由于不用外加电子调Q开关器件,仅仅在激光器的谐振腔内部置入可饱和吸收体(SA),通过它对特定波长光的饱和吸收特性就可以实现脉冲激光输出,因而被广泛研究。本篇文章重点介绍以一种新种类的材料—金纳米棒为SA的被动调Q脉冲激光器。在研究过程中,重点以Nd:YSAG晶体、Nd:LGGG晶体、Nd:YVO_4晶体作为增益介质,以808 nm的LD泵浦源,产生了1.06μm的脉冲激光。身为被动调Q激光器中的核心部分,可饱和吸收体的发展一直以来都备受关注。优质的饱和吸收体响应时间超快,并且要具有较宽的吸收带宽以及较高的三阶非线性系数等特点。1.本篇文章重点地介绍固体激光器以及光纤激光器所经历的发展进程,主要对被动调Q这种激光技术进行了介绍,并且对激光器的基本工作原理、调Q技术的理论进行介绍。2.重点介绍了几种激光晶体。对Nd:YSAG晶体、Nd:LGGG晶体、Nd:YVO_4晶体的工作特性进行了简介。对各晶体的优缺点进行了描述。并重点介绍了Nd:YSAG晶体相对于Nd:YVO_4晶体在当做增益介质时的优势。3.系统地描述了多种SA,其中包括传统的SA:Cr~(4+):YAG晶体、半导体可饱和吸收镜(SESAM)以及新型的SA:石墨烯、碳纳米管(CNT)。并重点对金纳米材料和其中的金纳米棒材料的工作特性进行了系统的描述。4.采用长径比是6.75的金纳米棒作为SA,研究了Nd:YSAG激光器、Nd:LGGG激光器、Nd:YVO_4激光器所输出激光的特性,获取1.06μm的激光,其脉冲的频率相对较高,峰值功率大。5.主要创新点:首次将金纳米棒作为饱和吸收体应用于全固态激光器中,并得到了频率高、功率大的1.06μm激光输出。并研究了Nd:YSAG晶体在当做增益介质时的工作特性。
[Abstract]:Because the passive Q-switched laser does not need the additional electronic Q-switched switch device, only the saturable absorber is placed in the resonator of the laser, by which the pulse laser output can be realized by the saturation absorption characteristic of the light at a specific wavelength. As a result, it has been extensively studied. In this paper, a new kind of passively Q-switched laser with gold nanorods as SA is introduced. In the research process, the ND: YVOS4 crystal of Nd:YSAG crystal is used as the gain medium and the LD pump source of 808 nm is used to produce a pulsed laser of 1.06 渭 m. As a core part of passive Q-switched lasers, the development of saturable absorbers has attracted much attention. The response time of the high quality saturated absorber is super fast, and it should have the characteristics of wider absorption bandwidth and higher third-order nonlinear coefficient. This paper mainly introduces the development of solid-state laser and fiber laser, mainly introduces the passively Q-switched laser technology, and introduces the basic working principle of laser and the theory of Q-switched technology. Several kinds of laser crystals are introduced in detail. The working characteristics of ND: YVOs _ 4 crystal with Nd:YSAG crystal ND: LGGG are briefly introduced. The advantages and disadvantages of each crystal are described. The advantage of Nd:YSAG crystal compared with Nd:YVO_4 crystal as gain medium. 3. A variety of SAs are systematically described, including conventional SA:Cr~(4: YAG crystals, semiconductor saturable absorption mirrors (SESAM) and new SA: graphene, carbon nanotubes (CNTs). The working characteristics of gold nanomaterials and gold nanorods are described systematically. 4. Using gold nanorods with a aspect ratio of 6.75 as SAs, the laser characteristics of ND: LGGG laser ND: YVO4 laser have been studied. A 1.06 渭 m laser has been obtained. The pulse frequency is relatively high and the peak power is 5. Main innovation points: gold nanorods are used as saturable absorbers for the first time in all-solid-state lasers, and 1.06 渭 m laser output with high frequency and high power is obtained. The working characteristics of Nd:YSAG crystal as gain medium are studied.
【学位授予单位】：山东师范大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN248

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