A solid-state light source apparatus includes a first excitation laser light source for outputting a laser beam of a first wavelength, a second excitation laser light source for outputting a laser beam of a second wavelength, a difference frequency between the laser beam of the first wavelength and the...http://www.google.es/patents/US6738397?utm_source=gb-gplus-sharePatente US6738397 - Solid-state light source apparatus
