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.

公开(公告)号：EP1541722A4

公开(公告)日：2011-04-27

申请号：EP03797652

申请日：2003-09-18

Applicant: NAT INST FOR MATERIALS SCIENCE

Inventor： KURIMURA SUNAO ,  HARADA MASAKI

IPC: C30B29/18 ,  B30B15/06 ,  C30B33/00 ,  G02F1/355 ,  G02F1/37

CPC classification number: C30B33/00 ,  B30B15/068 ,  G02F1/3558

公开(公告)号：EP1544670A4

公开(公告)日：2008-09-10

申请号：EP03797653

申请日：2003-09-18

Applicant: NAT INST FOR MATERIALS SCIENCE

Inventor： KURIMURA SUNAO ,  HARADA MASAKI

IPC: G02F1/377 ,  G02F1/35 ,  G02F1/37 ,  G02F1/355

CPC classification number: G02F1/3534 ,  G02F1/3544 ,  G02F1/3558

Abstract: A signal light is multiplexed with a control light emitted from a laser diode (3) by means of a WDM coupler (2). An optical fiber (4) at one end of the WDM coupler is mode-matched with the optical waveguide of a dummy phase matching crystal (1) by a V-groove (1a). An output light produced by the difference frequency between the signal light and the control light is guided again from the dummy phase matching crystal (1) to an optical fiber (5) by the V-groove (1a), and is beamed into an optical filter (7) where the signal light and the control light are cut. An optical fiber (9) is connected with a fiber amplifier (10). When a dummy phase matching crystal is used as a wavelength conversion element, a small non-linear constant causes a wavelength conversion efficiency to lower as compared with the case of lithium niobate, and a fiber amplifier (10) is provided to compensate for this. Accordingly, a optical communication-use wavelength conversion device that is almost free from problems with optical damage, can be used over a wide range of temperature, and has a good bonding power with a quartz optical fiber can be produced.

公开(公告)号：EP2555050A4

公开(公告)日：2014-01-22

申请号：EP11759336

申请日：2011-03-18

Applicant: NIPPON KOGAKU KK ,  NAT INST FOR MATERIALS SCIENCE

Inventor： HARADA MASAKI ,  MURAMATSU KENICHI ,  KURIMURA SUNAO

IPC: G02F1/37 ,  G02F1/355 ,  H01S3/06

CPC classification number: G02F1/3558 ,  G02F2001/3505 ,  G02F2201/46 ,  Y10T29/49826

Abstract: The present invention relates to an optical element and the like capable of continuously applying a required pressure. The optical element 1 is provided with a paraelectric crystal S, first and second pressers 10, 20 between which the paraelectric crystal is sandwiched, and fasteners 30A-30D. The paraelectric crystal S has a periodic structure in which polarities are periodically inverted along a polarity period direction. The fasteners 30A-30D fix the first and second pressers 10, 20 to each other so that a predetermined pressure is applied in a direction intersecting with the polarity period direction, to the paraelectric crystal S through the first and second pressers 10, 20.

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：DE60331083D1

公开(公告)日：2010-03-11

申请号：DE60331083

申请日：2003-09-18

Applicant: NAT INST FOR MATERIALS SCIENCE

Inventor： KURIMURA SUNAO ,  HARADA MASAKI

IPC: G02F1/37 ,  G02F1/355