What kinds of factors will influence the control range of green laser pointer ?

What kinds of factors will influence the control range of green laser pointer ?
In particular, the long-wavelength laser absorption rate is very low, so the use of laser heat treatment of metallic materials, the need to take certain measures to enhance the absorption rate of the surface light, and this is the pretreatment process. The commonly used method is phosphating, covering the coating and application-assisted laser method, the first two is widely used. Phosphide is a chemical or electrochemical reaction at the surface, the formation of the phosphate chemical conversion coating process, the formation of phosphate chemical conversion film called phosphate film, the composition of the phosphate film including manganese phosphate, zinc phosphate iron phosphate. The fantastic laser performance of  green laser pointer can be shown to the music.
Of metal phosphide purpose is to provide protection to the base metal to prevent metal corrosion to a certain extent; used for paint base, improve the ability of the end of the film layer adhesion and corrosion; from the reduction in the process of cold working of metals Mount role. In the laser hardening process, the formation of phosphate film aims to improve the energy absorption rate of the metal surface, up to 80%. But phosphating will also have some drawbacks: after phosphating workpiece laser treatment, the surface micro-cracks; phosphide surface after laser treatment the surface roughness increases, and for some workpiece, due to the use of the environment restricted laser hardening treatment to coating cleaning or removal of a clean, but the removal of the phosphate film is very difficult. And recently,  green laser pointer is also used in the store advertisement.
More representative of black paint and oxides. Absorbance rate, easy to remove after quenching. But for large-scale automated production need to address the following issues: (1) to find suitable absorbing coating; ② how to make the coating in the pending uniform surface coverage; ③ how to implement automated spray. The laser hardening process parameter selection. Laser quenching process is a complex process more than one parameter, these parameters include: laser power P, the spot size d, the scanning speed v, the laser work (continuous work or long-pulse mode), scan trajectory ( parts requirements), auxiliary gas pressure, laser mode (usually using a uniform energy distribution and higher order mode). Enjoy the indoor scenery created by  green laser pointer .
Laser hardened layer of depth to satisfy the relation:, where β is the metal surface coating of laser energy absorption rate. Organization performance after laser hardening. To deal with the surface at the surface to the highest possible temperature due to laser heating, so the depth of organizational performance very different,