Download High-Power Laser Radiation in Atmospheric Aerosols: by V.E. Zuev, A.A. Zemlyanov, Yu.D. Kopytin, A.V. Kuzikovskii, PDF

By V.E. Zuev, A.A. Zemlyanov, Yu.D. Kopytin, A.V. Kuzikovskii, Yu.F. Arshinov

Unique homes of laser radiation together with its monochromatic homes, polarization, excessive spectral depth, coherence, slim beam divergence, the opportunity of controlling the heartbeat length and radiation spectrum and, eventually, the truth that super excessive strength and effort create very favorable stipulations for the large program of lasers to communi­ cation structures, platforms for the lidar sensing and ultra-high-precision ranging, navigation, distant tracking of our surroundings, and lots of different platforms working within the surroundings. The operative potency of the above structures relies considerably at the nation of the ambience and the corresponding habit of laser radia­ tion propagating via it. This condition has influenced the stories of the above regularities throughout the passt 10-15 years. For the investiga­ tions to be performed the scientists have been pressured to strengthen new theories and strategies for learning the matter experimentally. additionally, in the course of such investigations a few formerly unknown phenomena have been saw, between them the nonlinear results accompanying high-power laser radiation propagating during the surroundings are of paramount value. one of the nonlinear results because of high-power laser radiation inter­ motion with the ambience, the consequences accompanying the propagation of high-power radiation during the atmospheric aerosols are of specific curiosity. Aerosols continually take place within the surroundings. it may be famous that the microphysical and optical features of atmospheric aerosols range broadly, this truth factors an excellent kind within the positive factors in their inter­ motion with radiation.

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1. 7) where Aa is the coefficient of thermal conductivity of the liquid; Xa = = Aa/CaPa; c a is the specific heat of the liquid; Ta is the temperature of a droplet surface; and Tcr is the critical temperature of the liquid. 8) The expression for the rate of droplet vaporization in regime 4 obtained in [10] is X [1 - exp (- 2 2 ~ a t)]. 9) was obtained under the assumption that the phase boundary is motionless. 9) can be found in the following manner. 10) where Ti is the temperature field inside the particle.

1, the scattered light signal at the laser modulation frequency exceeds that from the unmodulated laser beam by more than one order of magnitude, beginning at an initial intensity of incident radiation of 40 Mw/cm 2 . 5 1 Q5 o Fig. 2. --~ 1 Q6 Levels of the sounding beam's radiation scattering measured by a frequency-selective, tunable photodetector. (1) Ruby laser radiation modulated at 1 MHz. of randomly-peaked laser generation, 10 ~ (2) A regime -2 • 55 MWcm at the same intensity threshold. This can be explained by the presence of an intense modulation harmonic at 1 MHz in some laser shots.

4 7 o Fig. 1. 0 Uf. 1 /(oem The dependence of the temperature of a quartz particle, vaporized under diffuse conditions, on the parameter w. ~ = 3tI/ (4C Q ). 6 ]lm. Dotted lines 1 and 2 represent the melting and boiling points of the particle material. 35 EFFECTS OF RADIATION Fig. 2. Dynamics of vaporization of quartz particle (a O = 1 ~m) under diffuse conditions in a CO 2 laser radiation field. 1. 2. Pre-Explosion Gas-Dynamic Regime of Vaporization It is characteristic for metastable overheated states of particles that the probability arises of achieving vapor pressures at the particle surface which exceed atmospheric pressure.

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