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一般认为 ,用光纤光栅作选频元件的光纤激光器 ,激射波长与光纤光栅中心反射波长一致 ,本文报道了不同的实验研究结果。通过细致的实验研究 ,发现光纤光栅激光器激射波长相对于光纤光栅中心反射波长有一定的偏移。激射波长可以出现在光栅中心反射波长的长波端 ,也可以出现在其短波端。对不同腔结构的掺镱、掺铒光纤光栅激光器的深入研究证明 ,谐振腔的各向异性对激光器的激射波长偏移起到决定性的作用 ,波长最大偏移量主要受限于光纤光栅的反射带宽。通过激光腔内的偏振控制器改变谐振腔的各向异性 ,可以在光纤光栅的反射带宽内控制激射波长的位置。
It is generally believed that a fiber laser with a fiber grating as a frequency selective element has the same laser wavelength and the same wavelength as the center of the FBG. Different experimental results are reported in this paper. Through careful experimental research, it is found that the lasing wavelength of the fiber grating laser has a certain deviation from the reflection wavelength of the fiber grating center. The lasing wavelength can appear at the longer wavelength end of the grating reflection wavelength, can also appear in the short-wave end. In-depth study of different Y-doped and Erbium-doped fiber grating lasers with different cavity structures proves that the anisotropy of the resonator plays a decisive role in the lasing wavelength shift of the laser. The maximum wavelength shift is mainly limited by the fiber grating Reflection bandwidth. By changing the anisotropy of the resonator through the polarization controller in the laser cavity, the position of the lasing wavelength can be controlled within the reflection bandwidth of the fiber grating.