CAJ | 학술논문

研究了掺铥光纤激光器的不同谐振腔结构方式。使用LD泵浦，分别采用双色镜和端面反射、高反光纤光栅和端面反射以及双色镜和低反光纤光栅构成激光器谐振腔，均获得了超过Stokes极限的斜效率。其中双色镜和端面反射腔结构下获得了最高斜效率56.9%，对应的量子效率为142%。三种腔结构下，激光光谱线宽由激光器系统所采用的反射腔的光谱特性所决定。在双色镜和端面反射腔结构下，激光器在双色镜的高反带宽内随机起振，光谱较宽；在使用光纤布拉格光栅作为激光器谐振腔的高反射腔镜和低反射腔镜的情况下，激光器都获得了2μm处的窄线宽输出，线宽受限于所使用的光纤光栅的反射带宽。
연구료참주광섬격광기적불동해진강결구방식。사용LD빙포，분별채용쌍색경화단면반사、고반광섬광책화단면반사이급쌍색경화저반광섬광책구성격광기해진강，균획득료초과Stokes겁한적사효솔。기중쌍색경화단면반사강결구하획득료최고사효솔56.9%，대응적양자효솔위142%。삼충강결구하，격광광보선관유격광기계통소채용적반사강적광보특성소결정。재쌍색경화단면반사강결구하，격광기재쌍색경적고반대관내수궤기진，광보교관；재사용광섬포랍격광책작위격광기해진강적고반사강경화저반사강경적정황하，격광기도획득료2μm처적착선관수출，선관수한우소사용적광섬광책적반사대관。
LD clad-pumped high efficient Tm-doped fiber lasers with quantum efficiencies beyond the Stokes Limit were reported. Different laser cavities, including dichroic mirror with fiber end reflection, high reflective fiber Bragg grating (FBG) with fiber end reflection and dichroic mirror with low reflective FBG, were studied. A maximum slope efficiency of 56.9% was obtained with the dichroic mirror and the fiber end flection forming the laser cavity, corresponding to a quantum efficiency of 142%. Spectral linewidth of the laser output was closely related to the reflective mirrors used in different cavities. Selected by the broadband dichroic mirror, the laser resonated randomly with the high reflective band of t he dichroic mirror. With an FBG as the high reflective mirror of the laser cavity, narrow linewidth of 38 pm was attained at an output of 1W. In another laser configuration, one low reflective FBG was exploited as the output coupler, and narrow linewidth of 69 pm was achieved at an output of 0.9 W. And the laser linewidth was limited by the reflection bandwidth of the FBG used.