Title:
OPTICAL WAVEGUIDE AND PRODUCTION THEREOF AND OPTICAL DEFLECTOR CONSTITUTED BY USING THE WAVEGUIDE, OPTICAL INTEGRATING HEAD AND OPTICAL INFORMATION RECORDING AND REPRODUCING DEVICE
Document Type and Number:
Japanese Patent JPH03260604
Kind Code:
A
Abstract:
PURPOSE:To obtain the optical waveguide which has high resistance to optical damages, a decreased optical propagation loss and high efficiency by continuously and gradually decreasing the refractive index distribution of a proton exchange optical waveguide layer in the depth direction of a substrate. CONSTITUTION:The surface of an LiNbO3 crystal substrate 1 is subjected to a known proton exchange treatment and is thereby formed with the optical waveguide layer 2 which is then subjected to a heat treatment under specific conditions. Such a refrac tive index distribution in which the refractive index (n) of the optical waveguide layer 2 decreases continuously and gradually in a depth (y) direction from the surface thereof and substantially attains DELTAn=0 at the boundary with the substrate 1 is formed where the difference between the refractive index ns of the substrate 1 and the refrac tive index (n) of the optical waveguide layer 2 is designated as DELTAn(n-ns) and the depth from the surface of the substrate 1 as y. The optical deflector of high efficiency and the optical integrating head which is small in size and weight and allows high- speed accessing, etc., are, therefore, obtd. by using such optical waveguide.
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Inventors:
ITOU AKITOMO
HIYOSHI YASUO
KAWAMOTO KAZUTAMI
SATO HIDEMI
FUKUSHIMA TAKAKO
HIYOSHI YASUO
KAWAMOTO KAZUTAMI
SATO HIDEMI
FUKUSHIMA TAKAKO
Application Number:
JP5796690A
Publication Date:
November 20, 1991
Filing Date:
March 12, 1990
Export Citation:
Assignee:
HITACHI LTD
International Classes:
G02B6/26; G02B6/12; G02B6/122; G02B6/42; G02F1/335; G11B7/09; G11B7/135; G11B7/22; (IPC1-7): G02B6/12; G02B6/26; G02B6/42; G02F1/335; G11B7/09; G11B7/135; G11B7/22
Attorney, Agent or Firm:
Toshiyuki Usuda (1 outside)