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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。
The different resonant cavity structures of doped 铥 fiber laser are studied. Using LD pumped, the laser cavity was constructed using dichroic mirrors and end reflection, high anti-fiber grating and end reflection, and dichroic mirrors and low anti-fiber grating, respectively, with ramp efficiencies in excess of the Stokes limit. Among them, the highest oblique efficiency 56.9% and the corresponding quantum efficiency 142% were obtained under the dichroic mirror and the end reflection cavity structure. Under the three cavity configurations, the laser linewidth is determined by the spectral characteristics of the reflective cavity used by the laser system. Under dichroic mirror and end-reflecting cavity structure, the laser starts randomly at the high anti-reflection bandwidth of the dichroic mirror and has a wide spectrum. In the case of using the fiber Bragg grating as the high-reflecting cavity mirror and the low-reflecting cavity mirror of the laser resonator, Both lasers have narrow linewidth outputs at 2μm and linewidths are limited by the reflection bandwidth of the fiber gratings used.