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提出了一种复合腔结构的稳定单纵模(SLM)掺铒光纤激光器,其复合腔结构由主环形有源腔和两个次级无源腔组成。在光纤环形镜中嵌入未抽运的掺铒光纤作为可饱和吸收体以抑制多纵模,用光纤环谐振腔作为滤波器抑制拍频噪声,用光纤光栅作为波长选择器件,最终得到了单纵模输出并消除了拍频噪声。在整个波长调节范围内边模抑制比大于50dB,当泵浦功率为80mW时,掺铒光纤激光器输出功率为20.51mW,激光器的输出很稳定,在25min的观察时间内,输出功率的变化小于0.02%,实现了稳定的激光功率输出。
A stable single-longitudinal-mode (SLM) erbium-doped fiber laser with a composite cavity structure is proposed. The composite cavity structure consists of a main ring active cavity and two secondary passive cavities. In the fiber ring mirror embedded in the erbium-doped fiber as a saturable absorber to suppress the multi-longitudinal mode, with the fiber ring resonator as a filter to suppress beat-frequency noise, the use of fiber grating as a wavelength-selective device, the final single longitudinal The mode outputs and eliminates beating noise. When the pump power is 80mW, the output power of erbium-doped fiber laser is 20.51mW. The output of the laser is stable. The change of output power is less than 0.02 during the observing time of 25min %, To achieve a stable laser power output.