CAJ | 학술논문

针对激光束在大气中传播时,大气湍流引起的光强起伏等现象限制光束实际应用的问题,研究了消除或者减小大气湍流对光束质量影响的方法.基于广义惠更斯菲涅耳原理,通过数值模拟研究了超高斯贝塞尔(SGB)光束在不同湍流强度下的轴向和横向光强分布.针对SGB光束在一定传播距离上具有无衍射性和自恢复性能的研究发现,在弱湍流大气环境中,尽管湍流强度的增大会加速轴上光强的衰减,但是在一定距离范围内,SGB光束仍然保持其无衍射特点.在弱湍流强度变化范围内,通过选择合适的孔径函数,可以将SGB光束的横向光强分布的峰值变化限制在不超过10%,表明SGB光束具有一定的抵制大气湍流干扰的能力.
침대격광속재대기중전파시,대기단류인기적광강기복등현상한제광속실제응용적문제,연구료소제혹자감소대기단류대광속질량영향적방법.기우엄의혜경사비열이원리,통과수치모의연구료초고사패새이(SGB)광속재불동단류강도하적축향화횡향광강분포.침대SGB광속재일정전파거리상구유무연사성화자회복성능적연구발현,재약단류대기배경중,진관단류강도적증대회가속축상광강적쇠감,단시재일정거리범위내,SGB광속잉연보지기무연사특점.재약단류강도변화범위내,통과선택합괄적공경함수,가이장SGB광속적횡향광강분포적봉치변화한제재불초과10%,표명SGB광속구유일정적저제대기단류간우적능력.
Applications of laser beams to wireless communications are limited by the light intensity fluctuation caused by atmospheric turbulence when they propagate the atmosphere. In order to find out an approach to remove or decrease the effect of atmospheric turbulence on the beam quality, the axial and transverse light intensity distribution of the Super-Gaussian-Bessel (SGB) beam is investigated by means of a numeric simulation based on the general Huygens-Fresnel principle. As the SGB beam is characterized by its non-diffracting and self-reconstruction abilities over a certain propagation distance, it is proved that the axial intensity of the SGB beam is decreased under the influence of atmospheric turbulence, but its non-diffraction characteristics are still maintained over a certain propagation distance in the weak fluctuation. The peak intensity variation of the transverse intensity distribution of the SGB beam can be kept below 10 percent by selecting a proper aperture function in the range of weak fluctuation. These results show that the SGB beam has the ability to resist the influence of atmospheric turbulence.