Device and method for observing cloud and mist drops impacted by femtosecond laser filamentation

Abstract

The invention discloses a device and method for observing femtosecond laser filamentation impact cloud and mist drops. The device comprises an experiment cylinder, and the two ends of the experiment cylinder are communicated with bent pipes respectively and connected with a mist making assembly and a water vapor condensation and collection assembly respectively; an experiment area is formed in the middle of the experiment barrel, a first light guide pipe and a second light guide pipe which are located on the same straight line are arranged at the two ends of the experiment area, a femtosecond laser generating assembly is arranged on one side of the experiment barrel, and a light beam collecting assembly is arranged in the second light guide pipe; a double-pulse laser generating assembly is arranged at the upper end of the experimental area of the experimental cylinder, a plurality of groups of image collectors for collecting image information are arranged below the experimental cylinder, and the image collectors are electrically connected with a computer; and a system calibration plate is arranged between the first light guide pipe and the second light guide pipe in a sliding manner. The problem that high-dynamic and high-resolution measurement of femtosecond laser impact cloud and mist is difficult to realize in the prior art is solved, and effective experimental data is provided for revealing an optical transmission channel mechanism formed by femtosecond laser cleaning.

Description

technical field [0001] The invention relates to the cross-application field of optical physics and atmospheric science, in particular to a device and method for observing femtosecond laser filaments impacting cloud droplets. Background technique [0002] Femtosecond laser drilling holes in clouds is a new way to artificially affect the local cloud environment in recent years. It mainly uses the femtosecond laser transmission filament effect to reduce the laser transmission path. It has important potential application prospects in guiding strong laser and microwave transmission, assisting optical communication, etc., and has attracted extensive attention. [0003] The so-called laser filamentation is due to the mutual competition between optical Kerr self-focusing and plasma self-defocusing, and a long-distance transmission plasma channel is formed when the two reach dynamic equilibrium. Studies have shown that the thermal stress shock effect (also called "photomechanical" e...

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Problems solved by technology

However, since the radial range of the plasma filament action space is only a few hundred microns, there are still relatively large technologies to accurately obtain information such as the size distribution, motion trajectory, and spatial distribution (including quantity, concentration, and velocity) of the particle field. Difficulty, there is no report on the experimental measurement results of the refinement

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