CAJ | 학술논문

根据弗琅和费衍射理论，建立了19路、37路和91路光纤激光相干合成模型，仿真模拟了不同占空比情况下，大阵列合成光束在远场的强度分布和光束质量，分析了占空比排布与合成路数对远场光束质量的影响。仿真结果表明，随着光纤阵列占空比的下降，远场艾里斑内的光强逐渐减小，合成效果变差；反之，远场艾里斑内的光强逐渐增大，合成光束远场能量集中度增强，光束质量变好。因此，提高相干合成的效果，必须提高光束阵列的占空比。
근거불랑화비연사이론，건립료19로、37로화91로광섬격광상간합성모형，방진모의료불동점공비정황하，대진렬합성광속재원장적강도분포화광속질량，분석료점공비배포여합성로수대원장광속질량적영향。방진결과표명，수착광섬진렬점공비적하강，원장애리반내적광강축점감소，합성효과변차；반지，원장애리반내적광강축점증대，합성광속원장능량집중도증강，광속질량변호。인차，제고상간합성적효과，필수제고광속진렬적점공비。
A model of coherent beam combination (CBC) of fiber laser with 19-channel, 37-channel and 91-channel is established according to Fraunhofer diffraction theory. The far-field intensity distribution and beam quality of a large-scale CBC with different duty ratios are simulated. The influences of filling ratio and the number of sub-beams on beam quality of CBC in the far-field are analyzed. Simulation results show that the far field intensity in the Airy spot decreases with the filling ratio of the fiber array decreased, which leads to the degradation of combination effect. On the contrary, the far field intensity in the Airy spot increases with the filling ratio of the fiber array increased and the beam quality of CBC will be better. In order to obtain a high efficiency of CBC, the filling ratio must be improved simultaneously.