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提出一种基于弱反射光纤光栅(FBG)串的随机分布反馈掺铒光纤(EDF)激光器。激光器利用1 480nm半导体激光泵浦一段2 m长的高浓度EDF进行增益放大,由弱反射FBG串提供随机分布反馈,具有阈值低、线宽窄、效率高和输出稳定等优点。实验中,在激光器谐振腔的一端用一个反射率为90%的窄带FBG进行波长选择性反射,在另一端连接由20个波长相同、反射率在5‰左右的弱反射FBG组成的FBG串(总反射率为9%)提供随机分布反馈,在最大输出功率为400mW的1 480nm泵浦激光作用下获得了峰值波长为1 549.48nm、阈值功率为3 mW、斜率效率达24%的窄线宽稳定激光输出。在相同泵浦激光功率下,间隔一定时间,多次测量激光输出光谱,证实该随机分布反馈FBG激光器具有良好的波长和功率稳定性。
A stochastic distributed feedback erbium doped fiber (EDF) laser based on weakly reflected fiber grating (FBG) strings was proposed. The laser uses a 1 480 nm semiconductor laser to pump a 2 m long EDF for gain amplification. The weakly reflected FBG string provides random distribution feedback with the advantages of low threshold, narrow line width, high efficiency and stable output. In the experiment, one end of the laser resonator was wavelength-selective reflected by a narrowband FBG with a reflectivity of 90%, and the other end was connected with an FBG string consisting of 20 weakly reflecting FBGs with the same wavelength and a reflectivity of 5 ‰ With a total reflectance of 9%) to provide a stochastic distribution of feedback, a narrow linewidth of 1 549.48 nm with a peak power of 3 mW and a slope efficiency of 24% was obtained with a 1 480 nm pump laser with a maximum output power of 400 mW Stable laser output. Under the same pump laser power, the laser output spectra were measured several times at regular intervals, which proved that the FBG laser with random distribution has good wavelength and power stability.