Vågledare samt förfarande för framställning av sådan: [Quasi-phase-matched optical waveguides and method of making same]
1988 (Swedish)Patent (Other (popular science, discussion, etc.))
A waveguide (and a method for fabrication of a waveguide) for electromagnetic waves, arranged in an optically non-linear crystal substrate (1), such as LiNbO3, LiTaO3 or KTiOPO4, whereby a periodically domain-inverted structure, with periodically reversed ferroelectric polarity, is provided in a channel waveguide (6), having a higher refractive index than other parts of the substrate. The regions of reversed ferroelectric polarity are achieved by means of a heat treatment yielding a domain-inversion governed by a periodic perturbation in the crystal surface, obtained by use of a periodic mask structure on the crystal surface. The periodic structure is arranged in such a way that it constitutes a quasi-phase-matching structure. Thereby the waveguide is capable of converting light or radiation of a certain wavelength (certain wavelengths) to light or radiation of another predetermined wavelength (other predetermined wavelengths) with high efficiency.
Place, publisher, year, edition, pages
Atom and Molecular Physics and Optics
IdentifiersURN: urn:nbn:se:kth:diva-93196OAI: oai:DiVA.org:kth-93196DiVA: diva2:515351
SE 462352C (1990-10-04)
US 5170460 A (1992-12-08)2012-04-122012-04-122015-03-30Bibliographically approved