J4 ›› 2009, Vol. 26 ›› Issue (5): 543-547.

• Laser Tech. and Devices • Previous Articles     Next Articles

Spatial distribution of output laser in random laser

FU Fang-Zheng, LI Ming   

  1. Department of Physics, Nanchang University, Nanchang 330031
  • Published:2009-09-28 Online:2009-08-27

Abstract:

A kind of scattering is discussed and the corresponding distribution function is deduced . We analyze the geometry of the gain area, the spatial distribution of output laser is got by simulating the movement of stochastic photon in random medium by the use of the Monte Carlo method. The results show that :the laser intensity is the strongest in the normal direction. It weakens gradually with the angle increasing .The light intensity is symmetrical on the normal. The spatial distribution of output laser is connected with the mean free path of photons in random medium .According to these we can get the mean free path of the photons by measuring the spatial distribution of output laser. The vast majority of output laser photons (generally above 95%) scatter out within the distance of three mean free path from the interface.

Key words: laser physics, spatial distribution, Monte Carlo, scattering