Patent ID: 7443892

Claim:
A wavelength conversion laser device comprising: a laser light source for emitting first wavelength light; a non-linear optical crystal for converting the first wavelength light into second wavelength light; a rotational driver for rotating the non-linear optical crystal so as to alter an incidence angle of the first wavelength light with respect to the non-linear optical crystal; a rotational driving controller for detecting a portion of an output of the second wavelength light, generating a rotational control signal of the non-linear optical crystal in accordance with a change in the output, and transmitting the rotational control signal to the rotational driver; a beam location maintaining mirror for retroreflecting the second wavelength light, outputted from the non-linear optical crystal, along a substantially same path as that of the first wavelength light which travels from the laser light source to the non-linear optical crystal; and an output beam distributor disposed between the laser light source and the non-linear optical crystal to guide the retroreflected second wavelength light in a desired output direction.