基于Nd:SYSO晶体的激光输出特性研究

发布时间：2018-12-05 21:49

【摘要】：自从上世纪八十年代末出现以激光半导体泵浦的全固体激光器以来,激光技术领域发生了一场革命。全固态激光器以其高输出功率、高脉冲能量、超短脉宽为特征输出,以简单化、长寿命、可靠性为设计优势,在医疗、通信、印刷、科研、材料加工及军事等领域正在发挥着前所未有的作用,推动了传统产业和新兴产业的发展。本文以中科院上海硅酸盐研究所利用提拉法生长出来的Nd:SYSO晶体为研究对象,使用激光二极管通过光纤耦合系统对晶体泵浦,分别对连续输出光、调Q脉冲光和锁模脉冲光的输出特性进行分析研究,得到了输出功率、脉冲宽度、重复频率、脉冲能量等参数和吸收泵浦功率的变化关系。本文具体内容有以下几部分:1、总结了激光器从理论出现到如今百花齐放的发展过程,介绍了目前光电领域重点发展的全固态激光器,并列举了常见的掺Nd3+离子的激光晶体。2、实现了二极管端面泵浦Nd:SYSO激光器的多波长连续运转,并研究了输出镜在不同透过率情况下的输出特性。输出镜透过率T=5%时,泵浦阈值最小为0.7 W,输出功率最大为1.88W,斜效率和光光转化效率分别为29.7%和28.0%。3、利用声光调制器完成主动调Q脉冲双波长输出,输出光波长为1075.2 nm和1078.2nm。当泵浦功率为8.7 W,调制频率分别为5 kHz,10 kHz和15 kHz时候,最大的平均输出功率分别为556 m W,626 mW和720 mW,从连续光到脉冲光的转化效率分别为53.1%,46.8%和61.2%。当调制频率为5 kHz,泵浦功率为8.7 W时,得到最窄脉冲宽度为58 ns,对应的单脉冲能量为112μJ。4、利用Cr4+:YAG可饱和吸收体对Nd:SYSO激光器进行被动调Q。得到1075.2 nm和1078.2 nm双波长输出,输出镜透过率T=5%,泵浦功率6.7 W时,最大输出功率为843mW,光光转化效率为12.5%,斜效率为13%,最窄脉宽是26 ns。5、用Matlab编程,进行腔型设计,采用V型腔,利用Cr4+:YAG可饱和吸收体,进行Nd:SYSO调Q锁模,实现了调Q锁模脉冲输出。
[Abstract]:A revolution has taken place in the field of laser technology since the emergence of all solid state lasers pumped by laser semiconductors in the late 1980s. All-solid-state laser with its high output power, high pulse energy, ultrashort pulse width as the characteristic output, to simplify, long life, reliability as the design advantage, in medical, communication, printing, scientific research, Materials processing and military are playing an unprecedented role in promoting the development of traditional and emerging industries. In this paper, the Nd:SYSO crystal grown by the Czochralski method in Shanghai silicate Research Institute of the Chinese Academy of Sciences is taken as the research object. The laser diode is used to pump the crystal through the fiber coupling system, and the continuous output light is respectively used. The output characteristics of Q-switched pulse light and mode-locked pulse light are analyzed and studied, and the relationship between the output power, pulse width, repetition rate, pulse energy and absorption pump power is obtained. The main contents of this paper are as follows: 1. The development process of laser from theory to present is summarized, and the all-solid-state laser, which is the focus of optoelectronic field, is introduced. The multiwavelength continuous operation of the diode end-pumped Nd:SYSO laser is realized, and the output characteristics of the output mirror under different transmittance are studied. The minimum pump threshold is 0.7 W, the maximum output power is 1.88 W, the oblique efficiency and optical conversion efficiency are 29.7% and 28.0 路3, respectively. The acousto-optic modulator is used to realize the dual wavelength output of the active Q-switched pulse. The output wavelength is 1075.2 nm and 1078.2 nm. When the pump power is 8.7 W and the modulation frequency is 5 kHz,10 kHz and 15 kHz, respectively, the maximum average output power of 556 MW 626 mW and 720 mW, from continuous light to pulse light is 53.1, respectively. 46.8% and 61.2%. When the modulation frequency is 5 kHz, pump power is 8.7 W, the single pulse energy corresponding to the narrowest pulse width of 58 ns, is 112 渭 J. 4. Cr4: YAG saturable absorber is used to passively Q-switch the Nd:SYSO laser. The double wavelength output of 1075.2 nm and 1078.2 nm is obtained. The transmission rate of the output mirror is 5%. The maximum output power is 843 MW, the optical conversion efficiency is 12.5, the oblique efficiency is 13 and the narrowest pulse width is 26 ns.5, when the pump power is 6.7 W. The Q-switched mode-locking pulse output is realized by using Cr4: YAG saturable absorber and Nd:SYSO Q-switched mode-locking device, which is programmed by Matlab and designed for cavity shape, V-cavity and Cr4: YAG saturable absorber.
【学位授予单位】：曲阜师范大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN248

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