Description: Prof. Albert Einstein's concept on stimulated emission in 1918 became a reality in 1960 with the advent of masers and lasers. Subsequently, scientific commu-nity found many applications of lasers in various fields of science. Although, laser is a non-ionizing radiation, its power and energy may cause severe injuries if it is used carelessly at operation theatres, beauty par-lours and in our daily life. Hence, laser knowledge is of utmost importance to those personnel who are in the medical as
