为了改善980nm半导体激光器的输出光谱特性, 采用传输矩阵分析法推导了双布喇格光纤光栅谐振腔的传输表达式, 对布喇格光纤光栅长度和谐振腔腔长对输出光谱的影响进行模拟仿真, 结果表明布喇格光纤光栅长度对输出光谱的影响大于谐振腔腔长对输出光谱的影响, 加长布喇格光纤光栅长度能压缩输出光谱线宽.在980 nm半导体激光器尾纤上写入不同布喇格光纤光栅长度的双布喇格光纤光栅谐振腔, 验证了引入双布喇格光纤光栅谐振腔在压缩980 nm半导体激光器输出光谱线宽的同时改善了其输出光谱的稳定性.当环境温度在0-75℃范围内变化时, 980 nm半导体激光器输出中心波长仅变化0.06 nm.

In order to improve the output spectral characteristics of 980 nm semiconductor laser, the expression of transmittivity of dual fiber Bragg grating was deduced by the transfer matrix theory. The influence of fiber Bragg grating length and cavity length on output spectrum was conducted by simulation, the result shows that the fiber Bragg grating length′s influence on output spectrum is greater than fiber Bragg grating cavity length′s, and the width of output spectrum can be reduced by lengthening the fiber Bragg grating length. The dual fiber Bragg grating was fabricated on the tail fiber of 980 nm semiconductor laser to reduce the output spectral width of laser and to improve the stability of the laser output spectrum. The experimental results show that the center wavelength of 980 nm semiconductor laser changes only 0.06 nm when the environment temperature changes within the range of 0℃ to 75℃.