Wavelength conversion laser apparatus

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.