| Strong intensity variations of laser feedback interferometer caused by atmospheric turbulence |
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| 作者姓名： | 孙毅义 李治平 |
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| 作者单位： | Department of Mathematics and Information Science，Yantai University，Yantai 264005，Department of Mathematics and Information Science，Yantai University，Yantai 264005 |
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| 基金项目： | The authors would appreciate ICTP Treaste and the University of Florence for their financial supports when they perform this research in Italy. They are also greatly indebted to Prof. A. Consortini for her support in this research and for valuable sugges |
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| 摘 要： | The significant variation of the laser output can be caused by feedback of a small part of laser beam, which is reflected or backscattered by a target at a long distance from laser source, into the laser cavity. This paper describes and analyzes theoretically and experimentally the influence of atmospheric turbulence on interference caused by laser feedback. The influence depends upon both the energy of feedback into the laser cavity and the strength of turbulence over a laser propagation path in the atmosphere. In the case of stronger energy of feedback and weak turbulence variance of fluctuation of the laser output can be enhanced by hundreds to thousands times. From our measurements and theoretical analysis it shows that these significant enhancements can result from the change of laser-cavity-modes which can be stimulated simultaneously and from beat oscillations between a variety of frequencies of laser modes. This also can result from optical chaos inside the laser resonator because a non-separabl
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Strong intensity variations of laser feedback interferometer caused by atmospheric turbulence |
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| Abstract: | The significant variation of the laser output can be caused by feedback of a small part of laser beam, whichis reflected or backscattered by a target at a long distance from laser source, into the laser cavity. Thispaper describes and analyzes theoretically and experimentally the influence of atmospheric turbulence oninterference caused by laser feedback. The influence depends upon both the energy of feedback into thelaser cavity and the strength of turbulence over a laser propagation path in the atmosphere. In the caseof stronger energy of feedback and weak turbulence variance of fluctuation of the laser output can beenhanced by hundreds to thousands times. From our measurements and theoretical analysis it shows thatthese significant enhancements can result from the change of laser-cavity-modes which can be stimulatedsimultaneously and from beat oscillations between a variety of frequencies of laser modes. This also canresult from optical chaos inside the laser resonator because a non-separable distorted external cavity canbecome a prerequisite for optical chaos. |
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