4.4 Article

Transition from the ballistic to the snake regime of a femtosecond laser through a turbid medium via Monte Carlo simulation

期刊

LASER PHYSICS LETTERS
卷 19, 期 5, 页码 -

出版社

IOP Publishing Ltd
DOI: 10.1088/1612-202X/ac5b5c

关键词

ballistic photons; snake photons; turbid medium; femtosecond laser

资金

  1. National Natural Science Foundation of China [61905090]
  2. Major Innovation Projects of Shandong Province [2017CXGC0416]
  3. Program of Jinan Innovation Team [2018GXRC011]
  4. Science Foundation for Doctorate Research from the University of Jinan [XBS1823]

向作者/读者索取更多资源

This study investigates the transition from ballistic to snake diffusion of a femtosecond laser through a turbid medium using Monte Carlo simulation. The results show that the transition depth is close to the surface of the scattering volume and is dependent on the scattering coefficient of the medium. Unlike the intensity decay governed by Beer-Lambert law for ballistic photons, the intensity of snake photons initially increases with increasing thickness of the turbid medium and then decreases for all scattering coefficients ranging from 10 to 20 cm(-1). The balance point between the intensity of ballistic and snake photons depends on the scattering coefficient and the half-acceptance angle, and the product of the transmission depth and scattering coefficient is approximately a constant (around 2) for a specific simulation configuration.
We study the transition from the ballistic to the snake regime of a femtosecond laser through a turbid medium via Monte Carlo simulation. The results show that the transition depth of the ballistic to the snake regime of a femtosecond laser through a turbid medium is close to the surface of the scattering volume. The transition process depends on the scattering coefficient of the turbid medium. Unlike the decay of the intensities of the ballistic photons governed by Beer-Lambert law, the intensities of the snake photons first increase with an increase of the thickness of the turbid medium and then decrease with a further increase of the thickness, for all scattering coefficients ranging from 10 to 20 cm(-1). Further, we study the balance point of the intensity of the ballistic photons and the snake photons, which also depends on the scattering coefficient and the half-acceptance angle. The transmission depth corresponding to the transition balance point decreases with an increase of the scattering coefficient. In addition, for the transition balance point, the product of the transmission depth and scattering coefficient is approximately a constant (similar to 2) for a specific simulation configuration.

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