The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 03, 2009
Filed:
Mar. 08, 2007
Hong Yu Chu, Hsinchu, TW;
Joseph Lung Chang Ho, Hsinchu, TW;
Tze Chia Lin, Hsinchu, TW;
Ming Hsien Chou, Hsinchu, TW;
Hong Yu Chu, Hsinchu, TW;
Joseph Lung Chang Ho, Hsinchu, TW;
Tze Chia Lin, Hsinchu, TW;
Ming Hsien Chou, Hsinchu, TW;
HC Photonics Corp., Hsinchu, TW;
Abstract
A method for preparing a periodically poled structure according to this aspect of the present invention comprises the steps of providing a ferroelectric substrate and performing a poling process by applying a poling current to at least one portion of the ferroelectric substrate according to a current waveform. The current waveform include a major phase and a tailed phase accompanying the major phase; the major phase has at least one peak current (Ip) and terminates when the current drops substantially equal to Ip/e, and the charge delivered to the portion of the ferroelectric substrate during the major phase is larger than that delivered during the tailed phase. The nucleation phase is configured to generate nucleation sites in the portion of the ferroelectric substrate and the spreading phase is configured to increase the size of the nucleation sites.