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首页> 外文会议>Conference on Optics in Atmospheric Propagation and Adaptive Systems Ⅳ Sep 18-20, 2001, Toulouse, France >Influence of aerosols on propagation of intensive pulses of a CO_2 -laser of microsecond duration in the near-surface atmosphere
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Influence of aerosols on propagation of intensive pulses of a CO_2 -laser of microsecond duration in the near-surface atmosphere

机译：气溶胶对近地表大气中微秒持续时间的CO_2激光的强脉冲传播的影响

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The results of the field experiments on propagation of intensive pulses of CO_2- laser on the near surface atmospheric path have been discussed. The data are given on non-linear aerosol scattering, luminescence of aerosol particles and plasma in a light beam and their influence on the beam characteristics The field experiments have shown that the optical breakdown and thermal luminescence of aerosol particles are possible under the effect of the CO_2-laser pulses. The heating aerosol particle up to the temperature, when the developed evaporation is occurred, yet does not guarantee the appearance of the plasma initiation core, which is capable to evolve in the regime of light detonation. At the thermal mechanism of development of equilibrium plasma the luminescence intensity maxims in different ranges of the spectrum coincide in time and occur after a maximum of an effecting pulse. The intensity fluctuations in the beam at the beginning of the pulse do not result in the luminescence fluctuations, which arise only to the end of a pulse. It testifies to an essential role of energy of a line-transmitted spectrum of the luminescence core, i.e., not too high temperatures (T ～ 10~3 K) and the pressures achievable at absorption by particles of energy of the initiating pulse. The thermal blooming of luminescent particles are new radiation sources with dimensions, exceeding the size of aerosol particles by two orders that results in the 10~4 increase of the scattering radiation. The essential part of the laser energy scattered on these blooming, as well as on shock waves, will be concentrated in a narrow angle in a forward direction, as their dielectric constant is less, than it is for aerosol particles. The measured aerosol scattering coefficient is higher than the calculated linear coefficient by one order. It is shown, that the overcondensation at explosive destruction of a water aerosol by fragments can also result in the considerable increase of scattering for specific meteorological situations.
机译：讨论了在近地表大气路径上传播CO_2-激光的强脉冲的野外实验结果。给出了关于光束中的非线性气溶胶散射，气溶胶颗粒和等离子体的发光及其对光束特性的影响的数据。现场实验表明，在激光的影响下，气溶胶颗粒的光学击穿和热发光是可能的。 CO_2-激光脉冲。当发生明显的蒸发时，将加热的气溶胶颗粒加热到一定温度，但不能保证等离子体引发核心的出现，该等离子体能够在光爆轰下演化。在平衡等离子体发展的热机制下，在光谱的不同范围内的发光强度最大值在时间上重合并且在最大影响脉冲之后发生。在脉冲开始时光束中的强度波动不会导致仅在脉冲结束时出现的发光波动。它证明了发光芯线透射光谱的能量，即不太高的温度（T〜10〜3 K）和在启动脉冲的能量粒子吸收时可达到的压力，具有至关重要的作用。发光粒子的热起霜是新的辐射源，其尺寸超过了气溶胶粒子的大小两个数量级，导致散射辐射增加了10〜4倍。散射在这些光晕以及冲击波上的激光能量的主要部分将以向前的窄角度集中，因为它们的介电常数小于气溶胶颗粒的介电常数。测得的气溶胶散射系数比计算的线性系数高一个数量级。结果表明，在特定气象条件下，水气溶胶被碎片爆炸破坏时的过度冷凝也可能导致散射显着增加。

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