SECOND HARMONIC WAVE GENERATOR

• Main Author: KAWANAMI HIROSHI
• Format: Patent
• Language: English
• Published: 29.06.1992
• Subjects: BASIC ELECTRIC ELEMENTS; DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH ISMODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THEDEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY,COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g.SWITCHING, GATING, MODULATING OR DEMODULATING; DEVICES USING STIMULATED EMISSION; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR; ELECTRICITY; FREQUENCY-CHANGING; NON-LINEAR OPTICS; OPTICAL ANALOGUE/DIGITAL CONVERTERS; OPTICAL LOGIC ELEMENTS; OPTICS; PHYSICS; SEMICONDUCTOR DEVICES; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF

PURPOSE:To obtain an optical waveguide of a small propagation loss by providing a superlattice layer consisting of elements constituting a group II-VI compd. layer between the group II-VI compd. layer and a silicon substrate. CONSTITUTION:The superlattice layer 104 consisting of the elements constituting the group II-VI compd. is provided between the silicon substrate 101 and the group II-VI compd. at the time of growing the group II-VI compd. as a nonlinear optical crystal 102 on the silicon substrate 101. Then, the superlattice layer 104 acts as a buffer layer to the mismatching of the lattice constants of the silicon substrate 101 and the group II-VI compd. and suppresses the generation of crystal defects in the group II-VI compd. layer 102. The nonlinear optical crystal layer of the low propagation loss is formed in this way and the optical waveguide having the small propagation loss is obtd.