ACHIEVING EFFICIENT SHG IN THIN FILM WAVEGUIDES BY ADJUSTING WAVEGUIDE THICKNESS
Original Publication Date: 1979-Jun-30
Included in the Prior Art Database: 2004-Apr-01
Xerox Disclosure Journal
By second harmonic generation (SHG), frequency doubling can be obtained from infrared diode laser sources to create visible photons, such as 4500A (blue) photons. In such devices, the laser, such as DFB laser, is optically coupled to a thin film waveguide in which the frequency doubling takes place. By accurately controlling the thickness of the waveguide to a predetermined value so that the propagation constants of the generated second harmonic guided wave is equal to two times the propagation constant of the fundamental guided wave, efficient SHG can be achieved.