COMPOSITE PHOTONIC STRUCTURE ELEMENT, SURFACE EMITTING LASER USING THE COMPOSITE PHOTONIC STRUCTURE ELEMENT, WAVELENGTH CONVERSION ELEMENT, AND LASER PROCESSING DEVICE USING THE WAVELENGTH CONVERSION ELEMENT

摘要

A composite photonic structure element comprises a photonic crystal and multilayer films. The photonic crystal is formed by alternately laminating a plurality of sets of an active layer having a nonlinear effect for converting a fundamental wave into a second harmonic and an inactive layer having no nonlinear effect, and is constructed such that the energy of the fundamental wave coincides with a photonic bandgap end. Each of the multilayer films is formed by laminating a plurality of sets of two kinds of thin films having different refractive indexes and reflects the fundamental wave. The multilayer films are connected to both ends of the photonic crystal. The fundamental wave enters one of end faces and is reciprocally reflected between resonators having the multilayer films, so that the intensity of the fundamental wave is enhanced within the photonic crystal. The fundamental wave is converted into a second harmonic in the active layer, and the second harmonic is taken out from the other end face.