CAJ | 학술논문

泵浦耦合器是高功率光纤激光器的关键无源光器件，其制作工艺是采用泵浦光纤和主光纤侧面熔融的方法，该方法可以保持主光纤中信号光的低插入损耗，但泵浦光纤和主光纤之间的夹角对耦合效率影响较大。为解决这一问题，根据熔融侧面泵浦耦合器的结构特点，建立了物理模型，推导出各光纤中光功率与夹角关系的方程组，进行了数值仿真和实验论证，结果是随着泵浦光纤和主光纤之间夹角的减小，耦合效率会逐渐增大，但存在临界值，NA值小的泵浦光纤耦合效率高且临界角大，N A 为0．22的泵浦光纤，夹角小于9．7°时耦合效率最大值为96．9％，N A为0．15的泵浦光纤，夹角小于11．5°时耦合效率最大值为97．8％。
빙포우합기시고공솔광섬격광기적관건무원광기건，기제작공예시채용빙포광섬화주광섬측면용융적방법，해방법가이보지주광섬중신호광적저삽입손모，단빙포광섬화주광섬지간적협각대우합효솔영향교대。위해결저일문제，근거용융측면빙포우합기적결구특점，건립료물리모형，추도출각광섬중광공솔여협각관계적방정조，진행료수치방진화실험론증，결과시수착빙포광섬화주광섬지간협각적감소，우합효솔회축점증대，단존재림계치，NA치소적빙포광섬우합효솔고차림계각대，N A 위0．22적빙포광섬，협각소우9．7°시우합효솔최대치위96．9％，N A위0．15적빙포광섬，협각소우11．5°시우합효솔최대치위97．8％。
Pump coupler is the key passive optical device of the high‐power fiber laser .Its pro‐ducing process is the side‐fusing of the pump fiber and the main fiber .This producing process can keep the insertion loss of the main fiber low ,but the angle betw een the pump fiber and the main fiber has a great influence on the coupling efficiency .In order to solve this problem ,the theoretical model was established according to the structural characteristics of the fused side‐pump coupler .The equations of the power and the fiber angle were derived .The simulation re‐sults were obtained and were demonstrated by the experiments .The conclusions are as fol‐lows :the pump coupling efficiency gradually increases with the decrease of the fiber angle be‐tw een the pump fiber and the main fiber ,but the critical fiber angle exists .When the numeri‐cal aperture (NA) of the pump fiber is smaller ,the couple efficiency and the critical angle are larger .T he critical fiber angle is 9 .7 ° and the maximum coupling efficiency is 96 .9% w hen the pump fiber NA is 0 .22 .The critical fiber angle is 11 .5 ° and the maximum coupling efficiency is 97 .8% when the pump fiber NA is 0 .15 .The conclusions are instructive for the designs and the productions of the high‐power fiber coupler .