The use of a powerful laser source is necessary in order to compensate the low spatial density of light in laser sheet. An Ar⁺ ion gas laser is use to form the light sheet; it is operated on its green line, at λ=514 nm. This choice is made because the green line is the most powerful in Ar⁺ laser (in our case up to 1W are available) and the use of a shorter wavelength with respect to He-Ne laser allows for a much higher scattering efficiency of the Rayleigh phenomenon as shown in Eq. (1).this application could be Nd-YAG solid state laser, having a λ=532 nm at its second harmonic.