基于V:YAG的1.3μm调Q锁模固体激光器研究

发布时间：2018-03-30 14:42

本文选题：全固态　切入点：调Q锁模　出处：《北京交通大学》2017年硕士论文

【摘要】：1.3 μm全固态激光器具有小型化,热效应小,可靠性高,全固化,光束质量高等优点使其在科学研究、医疗、工业生产和国防建设等方面起到重要作用;1.34μm调Q锁模激光器也已经广泛应用于光纤通信、光学测量、光学参量振荡器等。因此备受国内激光研究所关注与重视。但多数文献研究主要集中在长腔谐振腔,所得激光重复频率较低;而吉赫兹锁模激光器在高速电光取样、通信、和光学时钟等领域已有广泛用途,高重复频率激光器已成为国际上重要的研究内容。因此本论文在考虑了谐振腔模式匹配、晶体的热透镜效应、稳腔条件、晶体特性、饱和吸收体损伤阈值等因素的基础上,理论优化设计激光谐振腔,最终实现了重复频率较高、激光指标较好的1.34 μm激光调Q锁模脉冲激光器以及相应的红光激光输出。其主要内容为:介绍了全固态激光器的发展历程、优势以及应用领域,简述了 1.3 μm Nd:YVO4、Nd:GdV04激光器的发展过程;阐述了调Q与锁模原理,并在理论上对Nd:YVO4、Nd:GdVO4激光晶体的V:YAG饱和吸收体调Q锁模理论进行了推导分析,获得其能量公式;详细介绍了激光工作介质性能参数;对饱和吸收体V:YAG进行了介绍和优点分析。通过相关理论优化设计激光腔,利用Nd:YVO4晶体,V:YAG为饱和吸收体,实现了重复频率较高的的1.3 μm调Q锁模激光输出;在稳态腔条件下,分别研究了不同腔镜在不同功率下的重复频率、平均功率以及调Q包络脉宽等激光特性,并对实验结果进行了分析。实现了结构小型化且高效吉赫兹的1.34 μm Nd:GdVO4/V:YAG调Q锁模激光的稳定输出。探讨优化了激光晶体相关实验条件,基于波动机制理论,理论模拟了相应单个调Q包络下的锁模脉冲图形并进行分析。实现了重复频率高达2 GHz的锁模脉冲,所得锁模调制深度近乎100%。调Q锁模激光的最大输出功率可达715 mW。此外还运用KTP倍频晶体进一步实现了 671 nm红光腔内倍频激光输出。
[Abstract]:The 1.3 渭 m all-solid-state laser has the advantages of miniaturization, small thermal effect, high reliability, full curing and high beam quality.The 1.34 渭 m Q-switched mode-locked laser has been widely used in optical fiber communication, optical measurement, optical parametric oscillator and so on.As a result, domestic laser research attention and attention.However, most of the literatures focus on the long cavity resonator, and the laser repetition rate is low, while the gigahertz mode-locked laser has been widely used in the fields of high-speed electro-optic sampling, communication, optical clock and so on.High repetition rate laser has become an important research content in the world.Therefore, on the basis of considering the factors of resonator mode matching, thermal lens effect, stable cavity condition, crystal characteristics, damage threshold of saturated absorber and so on, the laser resonator is designed theoretically and the repetition rate is high.A 1.34 渭 m Q-switched mode-locked pulse laser and the corresponding red laser output are obtained.The main contents are as follows: the development history, advantages and application fields of all-solid-state laser are introduced, the development process of 1.3 渭 m ND: YVO4N ND: GdV04 laser is briefly described, and the principle of Q-switching and mode-locking is described.The Q-switched mode-locking theory of V:YAG saturated absorber for ND: YVO4 / ND: GdVO4 laser crystal is deduced and analyzed theoretically, and its energy formula is obtained. The performance parameters of laser medium are introduced in detail, and the advantages and advantages of saturated absorber V:YAG are analyzed.The laser characteristics such as repetition rate, average power and Q-switched envelope pulse width of different mirrors at different power are studied, and the experimental results are analyzed.The stable output of 1.34 渭 m Nd:GdVO4/V:YAG Q-switched mode-locked laser with high efficiency and miniaturization is achieved.Based on the theory of wave mechanism, the mode-locked pulse pattern of a single Q-switched envelope is simulated and analyzed.The mode-locked pulse with repetition rate of up to 2 GHz is realized, and the modulation depth of mode-locking is close to 100.The maximum output power of Q-switched mode-locked laser is 715 MW.In addition, the intracavity frequency-doubling laser output of 671nm red light cavity is further realized by using KTP frequency-doubling crystal.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN248

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