Patent 7859743 was granted and assigned to NGK Insulators on December, 2010 by the United States Patent and Trademark Office.
A harmonics generating device has a periodic domain inversion structure 18 for converting a wavelength of laser beam to generate higher harmonics. An angle θ formed by a domain inversion plane P of the periodic domain inversion structure 8 and a propagation direction L of the laser beam is from 80 degrees to 89 degrees.