The Q-switched laser is used to remove unwanted brown spots, sun freckles, or tattoos from your skin. The laser energy pulse, which is in billionths of a second, releases the pigment into the skin so it can be naturally reabsorbed and disposed of by the body.
Q-switching is achieved by putting some type of variable attenuator inside the laser's optical resonator. When the attenuator is functioning, light which leaves the gain medium does not return, and lasing cannot begin. This attenuation inside the cavity corresponds to a decrease in the Q factor or quality factor of the optical resonator. A high Q factor corresponds to low resonator losses per roundtrip, and vice versa. The variable attenuator is commonly called a "Q-switch", when used for this purpose.
The power settings of the laser can be set at different levels and frequencies to accommodate your specific condition and expectations.