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为获得高质量输出光纤激光器,利用单模掺铒光子晶体光纤替代传统普通光纤作为谐振腔的增益介质,两个匹配的窄带光纤布拉格光栅作为波长选择元件,形成一个简单的线性腔结构,实现一台新型全光纤窄线宽掺铒光子晶体光纤激光器.该激光器线宽仅有55 pm,激发波长具有大于50 dB的边模抑制比.在激光二极管泵浦下,该激光器在波长1 550.22 nm处获得8 mW的最大输出功率和3.2%的斜率效率.通过在10 min,内每隔1 min对激光器的输出波长重复扫描,表明室温下激光器的输出波长稳定.在12 min内,其输出平均功率的最大扰动少于0.07 dB.
In order to obtain a high quality output fiber laser, a single-mode erbium-doped photonic crystal fiber is used as the gain medium of the resonant cavity instead of the conventional common fiber. Two matched narrowband fiber Bragg gratings are used as a wavelength selection element to form a simple linear cavity structure, A novel all-fiber narrow-line-width erbium-doped photonic crystal fiber laser with a linewidth of only 55 pm and an excitation wavelength with a side-mode rejection ratio of more than 50 dB is obtained.With a laser diode pump, the laser is excited at a wavelength of 1 550.22 nm The maximum output power of 8 mW and the slope efficiency of 3.2% were obtained by repeatedly scanning the output wavelength of the laser every 10 min within 10 min, indicating that the output wavelength of the laser at room temperature is stable, and the output average power The maximum disturbance is less than 0.07 dB.