1.6μm Er:YAG固体激光器调Q特性研究

发布时间：2018-03-02 16:02

本文选题：Er:YAG激光器　切入点：石墨烯　出处：《湖南大学》2015年硕士论文　论文类型：学位论文

【摘要】：工作波长为1.6μm的脉冲激光与其他波段激光相比,因其位于“人眼安全”波段,同时也是大气的传输窗口,在激光雷达、激光测距及空间自由通讯等领域有着广泛的应用和良好的发展前景。不仅如此,该波段激光还可以通过非线性频率转换技术获得3-5μm的中红外激光。近年来,如何产生线宽窄、转换效率高、光束质量好的1.6μm脉冲激光已经成为国内外研究热点。在众多产生1.6μm激光的解决方案中,采用激光二极管共振抽运Er:YAG固体激光器是目前最为理想的方式之一。调Q技术的产生是是激光发展史上的一个重要突破,满足特定应用领域对激光峰值功率和脉冲宽度等方面提出的更高要求。论文的实验部分分别基于被动调Q和主动调Q两种方法,采用1532 nm激光二极管作为泵浦源,实现了1645 nmEr:YAG调Q脉冲激光的产生。首先研究了基于石墨烯被动调Q的Er:YAG固体激光器。作为近年来涌现的新型二维材料,与其他可饱和吸收体相比,石墨烯展示出宽波段吸收、高损伤阈值、超快恢复时间和低饱和强度等优异性能,在作为激光器的可饱和吸收体方面具有极大的应用前景。实验中,沉积在石英片上的单层石墨烯插入激光谐振腔内充当可饱和吸收体。在最大入射泵浦功率为20.8 W时,获得了高脉冲能量窄谱线线宽的1645 nm脉冲激光输出,单脉冲能量和谱线线宽分别为13.5μJ和0.13 nm。其中,13.5μJ的输出脉冲能量约为之前报导的基于石墨烯调Q的Er:YAG激光器的两倍。主动调Q方面,基于RTP电光晶体采用加压式电光调Q方法对Er:YAG调Q激光器的输出特性进行了详细的实验研究。在1 kHz重复频率下,当泵浦功率增加到21.6 W时,输出功率达到最大值2.23 W,脉冲宽度和脉冲能量分别为170 ns和2.23 mJ。
[Abstract]:Compared with other wavebands, the pulsed laser with a working wavelength of 1.6 渭 m is located in the "human eye safety" band and is also an atmospheric transmission window in the lidar. Laser ranging and space free communication are widely used and have good prospects. Not only that, the laser in this band can also obtain 3-5 渭 m mid-infrared laser by nonlinear frequency conversion technology. In recent years, how to produce narrow line, The 1.6 渭 m pulsed laser with high conversion efficiency and good beam quality has become a research hotspot at home and abroad. Using laser diode resonance pumped Er:YAG solid-state laser is one of the most ideal methods at present. The emergence of Q-switched technology is an important breakthrough in the history of laser development. The experiment part of this paper is based on passive Q-switching and active Q-switching, and 1532nm laser diode is used as pump source. The generation of 1645 nmEr:YAG Q-switched pulse laser is realized. Firstly, Er:YAG solid-state laser based on graphene passively Q-switched is studied. As a new two-dimensional material, graphene exhibits wide band absorption compared with other saturable absorbers. High damage threshold, ultra-fast recovery time and low saturation intensity have great application prospects as saturable absorbers of lasers. Monolayer graphene deposited on a quartz wafer is inserted into a laser resonator as a saturable absorber. At a maximum incident pump power of 20.8 W, a 1645 nm pulsed laser with a narrow line width of high pulse energy is obtained. The single pulse energy and line width are 13.5 渭 J and 0.13 nm respectively. The output pulse energy of 13.5 渭 J is about twice that of the previously reported Er:YAG laser based on graphene Q-switched. The output characteristics of Er:YAG Q-switched laser are studied by using the pressurized electro-optic Q-switching method based on RTP electro-optic crystal. When the pump power is increased to 21.6 W at 1 kHz repetition rate, the output characteristics of Er:YAG Q-switched laser are studied in detail. The maximum output power is 2.23 W, the pulse width and pulse energy are 170 ns and 2.23 mJ, respectively.
【学位授予单位】：湖南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN248.1

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