LD泵浦石榴石晶体激光脉冲特性研究

发布时间：2018-10-12 20:09

【摘要】：激光二极管（LD）泵浦全固态脉冲激光器由于结构紧凑、脉冲宽度窄、峰值功率高、稳定性好、光束质量高等优点，在工业、医疗、通信和科研领域都有广泛的应用。石榴石晶体作为应用最广泛的激光晶体之一，具有热导率高、机械性能好、抗损伤阈值高等优点。本文利用V3+:YAG作饱和吸收体，分别研究了准连续激光二极管泵浦的Nd:GGG和Nd:LaGGG被动调Q激光器输出特性；利用半导体可饱和吸收体（SESAM）作为调制元件，研究了Nd:LaGGG和Yb:LuAG晶体的连续锁模激光输出特性。具体内容如下： 1.总结了全固态脉冲激光器的发展历史及全固态脉冲激光器的研究意义。阐述了半导体泵浦全固态激光器获得短脉冲的理论，包括调Q技术的基本原理及调Q方法，被动调Q激光器中可饱和吸收体的作用机理；从锁模的基本原理出发，对SESAM实现连续波锁模基本过程进行了分析，介绍了SESAM的基本结构和时间特性，以及色散补偿的必要性和相关元件。 2.简述了掺钕石榴石晶体的优点、准连续LD泵浦的优势以及1.3μm激光器的应用。在此基础上，采用准连续LD泵浦，V3+:YAG作可饱和吸收体，分别实现了Nd:GGG和Nd:LaGGG晶体1.3μm被动调Q激光运转，获得最大输出能量分别为1.4mJ和1.0mJ，脉宽7.8ns和8.1ns，最高单脉冲能量分别为127.3μJ和111.1μJ，峰值功率11.6kW和10.2kW。将实验结果与已有的报道中连续LD泵浦下的实验结果做了比对，发现无论是输出功率、转换效率、单脉冲能量还是脉宽，脉冲LD泵浦在高功率、大能量、窄脉冲激光器中都具有明显的优越性。 3.介绍了Nd:LaGGG和Yb:LuAG晶体的光学特性及研究现状。利用SESAM作为调制元件，分别实现了Nd:LaGGG和Yb:LuAG晶体1.0μm连续波锁模运转。获得最高输出功率分别为3.2W和1.07W，锁模脉宽17.25ps和1.03ps。
[Abstract]:Laser diode (LD) pumped all-solid-state pulse laser has been widely used in industry, medical treatment, communication and scientific research due to its compact structure, narrow pulse width, high peak power, good stability and high beam quality. Garnet crystals as one of the most widely used laser crystals have the advantages of high thermal conductivity, good mechanical properties and high damage threshold. Using V3: YAG as saturable absorber, the output characteristics of quasicontinuous laser diode pumped Nd:GGG and Nd:LaGGG passively Q-switched lasers are studied respectively, and the semiconductor saturable absorber (SESAM) is used as modulation element. The output characteristics of CW mode-locked laser in Nd:LaGGG and Yb:LuAG crystals are studied. The specific contents are as follows: 1. The development history of all-solid state pulse laser and the significance of all-state pulse laser are summarized. The theory of obtaining short pulses by semiconductor pumped all-solid-state laser is described, including the basic principle of Q-switched technology and Q-switching method, the action mechanism of saturable absorber in passively Q-switched laser, and the basic principle of mode-locking. The basic process of continuous wave mode-locking in SESAM is analyzed. The basic structure and time characteristics of SESAM, the necessity of dispersion compensation and the related components are introduced. The advantages of neodymium doped garnet crystal, the advantages of quasi-continuous LD pumping and the application of 1.3 渭 m laser are briefly described. On this basis, using quasi-continuous LD pump and V3: YAG as saturable absorber, 1.3 渭 m passively Q-switched laser operation of Nd:GGG and Nd:LaGGG crystals is realized, respectively. The maximum output energy is 1.4mJ and 1.0 MJ, the pulse width 7.8ns and 8.1 ns, the maximum single pulse energy 127.3 渭 J and 111.1 渭 J, the peak power 11.6kW and 10.2 kW, respectively. The experimental results are compared with those of the reported continuous LD pump. It is found that no matter the output power, conversion efficiency, single pulse energy or pulse width, pulse LD pump in high power, large energy. There are obvious advantages in narrow pulse lasers. The optical properties and research status of Nd:LaGGG and Yb:LuAG crystals are introduced. Using SESAM as modulation element, the mode-locking operation of Nd:LaGGG and Yb:LuAG crystals with 1.0 渭 m continuous wave is realized respectively. The highest output power is 3.2W and 1.07W, respectively, and the mode-locked pulse width 17.25ps and 1.03ps are obtained.
【学位授予单位】：山东师范大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN248

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