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通过在非线性偏振旋转环形腔中引入一种全光纤化的角度可调的起偏器,简化了被动锁模光纤激光器的结构,通过调节环形腔内的光纤起偏器和1/4波片的角度就能够实现锁模脉冲的输出。基于此简化结构,引入基于单片机的触发反馈电路,控制偏振片和波片的旋转状态,实现了腔内锁模脉冲的自动调节输出,得到平均功率为8mW的、重复频率为5.6 MHz的全自动锁模脉冲稳态输出。
By introducing an all-fiber angle adjustable polarizer into a nonlinear polarization rotating circular cavity, the structure of the passive mode-locked fiber laser is simplified. By adjusting the optical fiber polarizer and 1/4 wave plate in the annular cavity, The output of the mode-locked pulse can be realized. Based on this simplified structure, a microcontroller-based flip-flop feedback circuit is introduced to control the rotation state of the polarizer and the wave plate to realize the auto-regulated output of the mode-locked pulse in the cavity. An automatic output with an average power of 8 mW and a repetition frequency of 5.6 MHz Mode-locked pulse steady-state output.