CAJ | 학술논문

实验上发现了双环斑激光束在克尔介质中的光斑分裂效应.理论上,通过数值求解非线性薛定谔方程,发现当输入光斑功率超过100 kW/cm2时,产生光斑分裂和自聚焦效应,该阈值明显小于单环斑激光的自聚焦和光斑分裂阈值.我们认为是双环之间的耦合效应导致了这种结果,并给出了具体分析.
실험상발현료쌍배반격광속재극이개질중적광반분렬효응.이론상,통과수치구해비선성설정악방정,발현당수입광반공솔초과100 kW/cm2시,산생광반분렬화자취초효응,해역치명현소우단배반격광적자취초화광반분렬역치.아문인위시쌍배지간적우합효응도치료저충결과,병급출료구체분석.
The self-focusing and spot-splitting effects of the double-circle spot laser beam in Kerr-medium are observed in the expenment. Theoretically, with solving nonlinear Schr(o)dinger equation numerically, the effects of selffocusing and spot- splitting are generated when the input laser's power is 100 kW/cm2 , which is much lower than the single-circle spot laser beam's threshold of self-focusing and spot-splitting. Through numerically analysis, it finds that the decrease of threshold mainly results from the coupling effect between the two circles, which also leads to the fact that the two circles' focal length and focal intensity are different to each other.