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从理论和实验两方面对掺镱包层全光纤调Q激光器进行了研究.建立了相应的理论模型,根据调Q光纤激光器的速率方程理论,用基于“能量利用率与初始反转粒子数关系”求解剩余反转粒子数的新方法,得出了调Q光纤激光器的初始参数诸如抽运功率、纤芯直径、光纤长度、输出透过率等影响脉冲宽度和脉冲能量的规律,进一步明确了压缩脉冲宽度和提高脉冲能量的方法;优化了相关参数,为同类调Q光纤激光器的设计提供参考.实验用半导体激光器(LD)作为抽运源,增益光纤为D形双包层掺镱光纤.谐振腔高反端串接一个带尾纤的声光Q开关,实现了重复频率在10 Hz~100 kHz范围内可调声光调Q掺镱全光纤激光器的实验运转;在重复频率500 Hz时,脉冲宽度为3μs,脉冲能量达到2.94 mJ.
According to the rate equation theory of the Q-switched fiber laser, the energy conversion efficiency of the Y-doped cladding all-fiber Q-switched Q-switched laser is studied based on both theoretical and experimental aspects. Relationship "to solve the remaining reversal of the number of particles, the initial parameters of the Q-switched fiber laser such as pumping power, core diameter, fiber length, output transmittance and other pulse width and pulse energy of the law, further The method of compressing the pulse width and increasing the pulse energy is defined, and the relevant parameters are optimized, which can provide a reference for the design of similar Q-switched fiber laser.Using semiconductor laser (LD) as pumping source and gain fiber as D-shaped double- Optical fiber. The high-end of the resonant cavity is connected in series with a pigtailed acousto-optic Q switch to realize the experimental operation of an adjustable acousto-optic Q-switched all-fiber laser with a repetition frequency in the range of 10 Hz to 100 kHz; Hz, the pulse width is 3μs and the pulse energy reaches 2.94 mJ.