掺镱包层光纤激光器的全光纤调Q技术

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.

All-Fiber Q-Switched Ytterbium-Doped Double-Clad Laser

Q-switched ytterbium-doped double-clad fiber laser has been studied in both theory and experiment, and theory model is built. A novel method based on 'the relationship between the energy utility ratio and the initial particle inversion' to solve the final particle inversion remaining is advanced . According to the rate-equation theory of the Q-switched fiber laser, the general law that some important initial parameters, such as pump power, fiber core diameter, fiber length, output transmittance and fiber inherent loss influence the pulse width and energy is worked out. The analysis of these parameters is of important reference to designing the kindred Q-switched fiber lasers. In the experiment, a D-shape ytterbium-doped double clad gain fiber pumped by laser diode is used. A pigtailed acoustooptic Q-switch is inserted between the totally reflected fiber Bragg grating (FBG) and the combiner’s signal port. During the experiment, the operation of the acoustooptic Q-switched Yb3+-doped all-fiber laser is realized. The repetition rate can be adjusted continuously between 10 Hz and 100 kHz. The 3 μs pulse width and the 2.94 mJ pulse energy are obtained at the repetition rate of 500 Hz.