Patent ID: 7580433

Claim:
A laser system comprising: a laser diode that oscillates in a multi-mode and has characteristics in which its oscillation wavelength varies with temperature; a grating that receives a light beam emitted from the laser diode and returns a diffracted beam to the laser diode; a mechanism that changes the wavelength of the diffracted beam returned to the laser diode; a wavelength detector that detects the wavelength of an output beam which is the same as that of the diffracted beam returned to the laser diode; a temperature regulator that maintains the laser diode at a predetermined temperature; and a control unit that controls the mechanism so that the output beam having a predetermined wavelength is output and controls the temperature regulator so that the laser diode oscillates at the predetermined wavelength; and a mirror that reflects the light beam, reflected by the grating, in a predetermined direction, and partially transmits the light beam applied to a first surface of the mirror such that the light beam passes through the mirror to the rear thereof, wherein, the mechanism includes a rotating assembly for rotating the grating and the mirror, and the control unit includes a two-segment detector that receives the light beam outgoing from the rear of the mirror and detects an electrical signal corresponding to the wavelength of the light beam, and controls the rotating assembly so that the wavelength of the light beam outgoing from the rear of the mirror coincides with the predetermined wavelength.