Vol. 17, issue 04, article # 4

pdf Zemlyanov A. A., Geints Yu. E. Optical breakdown thresholds for transparent microparticles irradiated with laser pulse of the nano-, pico-, and femtosecond duration. // Atmospheric and oceanic optics. 2004. V. 17. No. 04. P. 268-273.
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We consider the initial stage of the plasma formation due to optical breakdown near aerosol particles in the field of an intense laser radiation. The intensity threshold of the optical breakdown of transparent microparticles exposed to radiation of a single laser pulses of nano-, pico-, and femtosecond duration is calculated based on the nonstationary Mie theory and numerical solution of the rate equation for the electron concentration in plasma. It is shown that the femtosecond mode of optical breakdown of a particle is characterized by a higher (approximately by two orders of magnitude) initiation threshold as compared with the breakdown under the exposure to nano- and picosecond-duration pulses, as well as by higher concentration of free electrons near the external focal point for the radiation incident on the particle.