CAJ | 학술논문

基于谱分析方法系统研究了多个线性啁啾高斯脉冲堆积的强度起伏频率.首先基于傅里叶变换方法分别分析并模拟了两路和多路线性啁啾高斯脉冲堆积,讨论了等幅度、等延迟多路线性啁啾高斯脉冲堆积的情况下,起伏频率与初始高斯脉冲的数目与啁啾系数、时间延迟和脉冲宽度的关系,并简要分析了多路线性啁啾高斯脉冲堆积的一般情况.结果表明,在堆积脉冲的强度谱中存在一系列分立的频率边带,这些频率边带对强度起伏有贡献.高频的频率边带由于幅度交叠的部分较少,所以对强度起伏贡献较少.强度起伏频率随初始啁啾高斯脉冲啁啾系数和时间延迟的增大而增大,随脉冲宽度的减小而增大.
기우보분석방법계통연구료다개선성조추고사맥충퇴적적강도기복빈솔.수선기우부리협변환방법분별분석병모의료량로화다로선성조추고사맥충퇴적,토론료등폭도、등연지다로선성조추고사맥충퇴적적정황하,기복빈솔여초시고사맥충적수목여조추계수、시간연지화맥충관도적관계,병간요분석료다로선성조추고사맥충퇴적적일반정황.결과표명,재퇴적맥충적강도보중존재일계렬분립적빈솔변대,저사빈솔변대대강도기복유공헌.고빈적빈솔변대유우폭도교첩적부분교소,소이대강도기복공헌교소.강도기복빈솔수초시조추고사맥충조추계수화시간연지적증대이증대,수맥충관도적감소이증대.
Intensity fluctuation in linearly chirped Gaussian pulse stacking(LCGPS) is studied systematically based on spectral analysis. Two-pulse LCGPS and multi-pulse LCGPS are analyzed with simulations based on Fourier transform. The variation of fluctuation frequencies with the number, chirp factor, time delay and pulse width of the Gaussian pulses is discussed in the case of multi-pulse LCGPS with inital pulses of the same amplitude and the same time delay. Finally a brief discussion is presented on the general case of multi-pulse LCGPS with initial pulses of different amplitude attenuation and different time delay. The results show that there are several separated frequency sidebands in the intensity spectrum of the stacked pulse, responsible for the intensity fluctuation. The higher frequency sidebands would have less contribution to the fluctuation due to smaller amplitude overlapping. The fluctuation frequencies increase with the growth of the chirp factor and time delay, and the decrease of pulse width of the initial Gaussian pulses.