CAJ | 학술논문

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.