公开(公告)号：EP1542070A4

公开(公告)日：2008-09-03

申请号：EP03797651

申请日：2003-09-18

Applicant: NAT INST FOR MATERIALS SCIENCE

Inventor： KURIMURA S ,  HARADA MASAKI

IPC: G02F1/377 ,  G02F1/35

CPC classification number: G02F1/3544 ,  G02F2001/3509 ,  G02F2201/063

Abstract: Two grooves (10) are dice-cut along a light passing direction in a crystal dummy phase matching element (1) to thereby form a protrusion (11), held between the two grooves (10), on the upper surface side in Figures as shown in Figs. 4 (b), (c); and a ridge type waveguide (9) is formed within the protrusion. When light is allowed to pass through the waveguide (9), the light passes through a crystal axis reversal portion (polarization reversal region) (4) while being confined in the waveguide (9) to undergo wavelength conversion. A light energy can be kept high within a wavelength conversion element to ensure a high wavelength conversion efficiency.

公开(公告)号：EP1542069A4

公开(公告)日：2008-09-03

申请号：EP03797650

申请日：2003-09-18

Applicant: NAT INST FOR MATERIALS SCIENCE

Inventor： KURIMURA S ,  HARADA MASAKI

IPC: G02F1/37 ,  G02F1/355

CPC classification number: G02F1/3558

Abstract: A rectangular convex portion (2) is formed, as an aggregate of finer rectangular convex portions (4), on one surface of a crystal substrate (1). Concave portions (5) lower than the surfaces of the convex portions (4) are formed between the convex portions (4). The concave portions (5) have narrow widths, and, in a macroscopic view, a large number of the convex portions (4) gather to form one convex portion (2). Such a crystal substrate (1) is vertically sandwiched by a heater block and heated. When the temperature of the substrate is a desired temperature, the substrate is pressed by a press. Then stress is applied only to portions corresponding to the convex portions (4), and crystal axis components are revered only in these portions. The reversal portions grow and are propagated into the inside of the crystals, and portions correspond to the convex portions (4) are connected to form a crystal axis reversal region (6). This way, a crystal axis reversal region with an aimed shape can be easily formed.