Some technical problem of green laser pointer should be solved as soon as possible

Mie scattering theory when the particle size and laser wavelength or less, resulting in Mie scattering theory can be strictly solved. The following summary shows the Mie theory and the distribution of cloud-scale model of a cloud of laser attenuation. The results show that, in the near-infrared bands for the tropospheric haze particles in the decay of Mie theory calculations predict a more reasonable application; generally higher attenuation caused by clouds, and as the visibility decreases, the attenuation increases rapidly. Therefore, when Vb <15 km, the haze caused by attenuation need to be considered; when Vb is small, the cloud attenuation is to limit the laser performance of the main factors [3]. For the 1.06μm laser, the particles can be seen as a large spherical particle precipitation (x = 2πa/λm 1), attenuation coefficient and wavelength independent, only the water content determined by the geometric cross-section to determine the particle. In considering the rainfall rate, temperature and relative humidity based on factors such as a rain attenuation model [1], gives the scattering coefficient and visibility in the rain the relationship: the atmospheric turbulence is the free-space optical transmission are facing a major the problem. For random-channel light transmission, the beam expander, beam jitter and coherence degradation is to limit the effectiveness of the laser to fully play its important factor. Light transmission and imaging through atmospheric laser communications, aerial mapping and satellite remote sensing, radar, optical field of the turbulent atmosphere in the optical system design and use must be considered. The design liaison meeting of green laser pointer will be delayed to next week for some reasons.
The atmosphere is always in constant movement, the formation of temperature, pressure, density, size, etc. of different gas vortex. Cross-linking of these vortices, superimposed to form a random turbulence. Laser in the turbulent atmosphere, the transmitted beam wave front will be a random fluctuation, causing beam wander, beam broadening and light flashes. As the size of the turbulence length scale turbulence and turbulent outer scale continuous distribution, the beam diameter in the dissemination process of changing the turbulence effects always occur simultaneously. General rule as follows: ① When the beam diameter is much smaller than the turbulence length scale, the turbulence generated random key so that the beam deflection, beam receiving surface drift; ② When the turbulence scales approximately equal to the beam diameter, turbulence occurs mainly random deflection to the beam cross-section, to form the angle of arrival and downs, appears on the receiver side focal plane pixel jitter; ③ more common situation is when the turbulence scale is much larger than the beam diameter of the light intensity caused when flashing. Difference in flight turbulence, for example, in the boundary layer flow in the two memory states are the laminar boundary layer and turbulent boundary layer. Some technical problem of green laser pointer should be solved as soon as possible.