Suggested is a laser wavelength converting apparatus which includes a condensing lens which is made of birefringence materials to pass and concentrate an infrared laser beam and a green laser beam and a sum frequency generating device which supplies an ultraviolet laser beam by combining the green laser beam with the infrared laser beam concentrated through the condensing lens. According to the present invention, the quality of the beam and the output of the ultraviolet laser beam are improved by solving a problem due to the chromatic aberration of the condensing lens.
