EP 1092165 A1 20010418 - APODIZATION OF OPTICAL FILTERS FORMED IN PHOTOSENSITIVE MEDIA
Title (en)
APODIZATION OF OPTICAL FILTERS FORMED IN PHOTOSENSITIVE MEDIA
Title (de)
APODISATION VON IN PHOTOSENSITIVEN MEDIEN GEBILDETEN OPTISCHEN FILTERN
Title (fr)
APODISATION DE FILTRES OPTIQUES FORMES DANS DES MILIEUX PHOTOSENSIBLES
Publication
Application
Priority
- US 9914942 W 19990630
- US 9154798 P 19980701
Abstract (en)
[origin: WO0002068A1] Filter gratings are formed in optical waveguides (50) having photosensitive cores by exposing the cores to actinic radiation in the form of interfering beams (38, 40) having peak intensities (72, 74) that are relatively displaced along an optical axis (64) of the waveguides. Each of the interfering beams has a single-lobed intensity profile and a degree of spatial coherence required to achieve a desired fringe contrast between the two relatively displaced beams. Index modulations in the photosensitive core match the illumination (interference) pattern of the radiation. The relative displacement of the interfering beams reduces side lobes of the gratings' spectral responses by leveling the average refractive index of the index modulations. A second exposure with the two beams but without the beams' interference effects further levels the average refractive index.
IPC 1-7
IPC 8 full level
G02B 5/18 (2006.01); G02B 6/02 (2006.01); G02B 6/122 (2006.01); G02B 6/13 (2006.01); G02B 27/58 (2006.01); G02B 6/34 (2006.01)
CPC (source: EP KR)
G02B 6/02085 (2013.01 - EP KR); G02B 6/02133 (2013.01 - EP KR); G02B 6/02138 (2013.01 - EP KR); G02B 6/29347 (2013.01 - EP KR); G02B 27/58 (2013.01 - EP KR)
Designated contracting state (EPC)
DE FR GB IT SE
DOCDB simple family (publication)
WO 0002068 A1 20000113; AU 4852399 A 20000124; CA 2336329 A1 20000113; CN 1342269 A 20020327; EP 1092165 A1 20010418; EP 1092165 A4 20050622; JP 2002519742 A 20020702; KR 20010053247 A 20010625
DOCDB simple family (application)
US 9914942 W 19990630; AU 4852399 A 19990630; CA 2336329 A 19990630; CN 99810053 A 19990630; EP 99932157 A 19990630; JP 2000558408 A 19990630; KR 20007014919 A 20001228