【作者】 陈飞；

【导师】 刘杰；

【作者基本信息】 山东师范大学 ， 光学， 2010， 硕士

【摘要】 全固态激光器具有效率高、寿命长、稳定性好、光束质量好等优点,能够获得高功率和高光束质量输出。在光电子业、军事、医学、信息以及科研等领域都具有广泛的应用,现在已经成为激光产业和器件研究领域的热点之一。本论文对LD端面泵浦全固态Nd:GdVO₄声光调Q红光、绿光和紫外激光器进行了实验研究,目的是为了获得窄脉宽、高峰值功率、高效率、高稳定性的激光输出。论文的主要内容有:1.论文简单概述了LD泵浦全固态激光器的发展,并介绍了几种常用的非线性晶体的特性.给出了声光调Q理论基础,对非线性晶体的倍频、四倍频理论以及相位匹配理论进行分析。2.实验研究了LD端面泵浦Nd:GdVO₄晶体声光调Q1342nm激光器的输出特性。在泵浦功率为9.2W、重复频率为10kHz,输出镜的透过率为15%时,1342nm的最大平均输出功率为1.6W,相应的脉冲宽度为35ns。3.分别采用KTP和BBO对Nd:GdVO₄的1342nm进行倍频,得到了高效率、窄脉宽的671nm的激光输出。在LBO为倍频晶体时,在泵浦功率为9.2W,重复频率为15kHz时,我们得到了1.36W最大的671nm红光平均输出功率,808nm到671nm的光光转换效率为14.8%。据我们所知,这是目前最高的转换效率。在相同的泵浦功率下,重复频率为5kHz时,得到了最窄的脉宽28ns和0.93W的平均输出功率,计算得到相应的单脉冲能量和峰值功率分别为186μJ和6.65 kW。4.简单介绍了Nd:GdVO₄/KTP 532nm绿光激光器。采用腔外倍频,以KTP晶体为二倍频晶体,BBO为四倍频晶体,对Nd:GdVO₄1064nm波段进行四倍频,得到了高效率、窄脉宽的266nm紫外激光输出。在泵浦功率14.32W、重复频率20kHz的情况下,获得了374mW的266nm紫外激光输出,808nm到266nm光光转换效率为2.6%,脉宽5ns,计算得到相应的单脉冲能量18.7μJ和峰值功率3.67kW。更多还原

【Abstract】 LD pumped solid state Q-switched lasers have become a focus in the field of lasers due to their advantages of high efficiency, long lifetime, high stability, high power and good quality of light beam, and etc. They are widely used in many fields, such as optoelectronics industry、medical treatment, military, scientific research, and etc. In order to obtain laser pulse with short duration, high efficiency, high peak power, high stability, this paper was made experimental researches around LD pumped AO Q-switched red, green, and ultraviolet lasers. The main contents can be summarized as follows:1. The development of LD pumped solid state lasers are simple reviewed, and some properties of nonlinear crystals such as LBO, KTP, CLBO and BBO were introduction. The theory of AO Q-switched, the theory of nonlinear frequency doubling and the principle of nonlinear phase matching were analyzed.2. Experiment study the properties of LD diode pumped Q-switched Nd: GdVO₄ crystals 1342nm laser. Under the incident pump power of 9.2W, the maximum output power at 1342nm was obtained to be 1.6W, with the repetition frequency of 10 kHz and coupled transmission of output mirror 15%, the pulse width was measured to be 35ns.3. By using the KTP or LBO as the intracvity frequency doubler, a compact and efficient diode-end-pumped AO Q-switched Nd: GdVO₄ red laser was demonstrated. Such as using the LBO crystal, under the incident pump power of 9.2 W, the maximum average output power at 671 nm was obtained to be 1.36 W at repetition frequency of 15 kHz, with the corresponding optical-optical conversion efficiency of 14.8%. At the same incident pump power, the shortest pulse width at 671 nm was obtained to be 28 ns at the repetition frequency of 5 kHz, and the average output power of 0.93 W. The single pulse energy and peak power are calculated to be 186μJ and 6.65 kW, respectively.4. Simple analyzing the Nd: GdVO₄/KTP 532nm green laser. By simple extra-cavity frequency conversion, the performance of a diode single-end-pumped AO Q-switched Nd: GdVO₄/KTP/BBO 266 nm laser was demonstrated. Under the incident pump power of 14.32 W, the maximum average output power at 266 nm was 374 mW at the repetition of 20 kHz; the optical-optical conversion efficiency was 2.6%. The corresponding pulse width was 5 ns, with the single-pulse energy and peak power calculated to be 18.7μJ and 3.74 kW, respectively.更多还原