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选用介质膜作谐振腔镜,光纤激光器就缺乏有效的选频机制,使得输出激光线宽较宽,纵模频率和输出功率不够稳定;而光纤光栅作为激光器的谐振腔镜,可以得到稳定的窄线宽激光输出。通过对光纤光栅的形成机理和布拉格光栅选频原理分析,得到双布拉格光纤光栅线型谐振腔的理论。光纤光栅谐振腔的长度与光纤光栅中心波长满足S=(2m-1)λmax/4neff,光纤光栅比介质膜更适合做光纤激光器谐振腔镜。
The use of dielectric film as a resonator mirror, the lack of effective fiber laser frequency selection mechanism, making wide output laser linewidth, longitudinal mode frequency and output power is not stable enough; and fiber grating as a resonator resonator mirror, you can get a stable narrow Linewidth laser output. Through the formation mechanism of fiber grating and Bragg grating frequency selection principle analysis, the theory of double Bragg fiber grating linear resonator is obtained. The length of the fiber grating resonator and the center wavelength of the fiber grating satisfy S = (2m-1) λmax / 4neff. The fiber grating is more suitable than the dielectric film for the fiber laser resonator mirror.