10 December 1999 Phase distortions of sensing beams propagating through aerosols irradiated by power pulse radiation
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Abstract
Nonlinear amplitude and phase distortions of the laser beams propagating through the water aerosol studied experimentally are presented in this paper. Pulses of CO2- and YAG- lasers effect small water drops. As a result of this action, the drops were evaporated and fragmented into many microparticles. Deformations of wave front of a sensing beam with the Gaussian form have been studied. Measurements of the phase were carried out with the use of the Mach-Tsender interferometer. The time of explosion as a function of absorbed energy and pulse duration have been obtained in these experiments. The spatial and temporal inhomogeneities of a sensing wave front as function of the incident radiation (their wavelength, energy, and pulse width) have been studied. It was shown that the fast heating of particles and vapor bubbles generation leads to defocus of sensing beam, but intensive vapor fluxes lead to the focus of sensing beam. The time of beginning the distortion process was measured as function wavelength and absorbed energy of incident pulses. These experimental results may be useful for development of the adaptive system operating under nonlinear condition.
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Liliya K. Chistyakova, Liliya K. Chistyakova, Robert L. Armstrong, Robert L. Armstrong, J.-G. Xie, J.-G. Xie, } "Phase distortions of sensing beams propagating through aerosols irradiated by power pulse radiation", Proc. SPIE 3866, Optics in Atmospheric Propagation and Adaptive Systems III, (10 December 1999); doi: 10.1117/12.371313; https://doi.org/10.1117/12.371313
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