Light ids a kind of electromagnetic waves which is expressed with simple equations in optics. With the simplified formulation of the wave equation, one can simulate every type of optical system. Laser is a kind of amplified electromagnetic field in the visible or near infrared spectrum.
Laser is based upon light amplifying through stimulation of radiation in a resonance cavity. In recent years, there has been an increasing trend in investing in high power lasers with pulsed technique and also changing frequency by the aid of higher order harmonics. In this domain, being equipped with excellent knowledge of active materials for laser, electrical or optical pumping, resonators, and cooling and heat removal is necessary. Material processing by laser beam is another noticeable domain.
