Invention Application
US20080055720A1 Optical Data Storage System with an Inorganic, Dielectric Grid Polarizer
审中-公开
具有无机,电介质网格偏振器的光学数据存储系统
- Patent Title: Optical Data Storage System with an Inorganic, Dielectric Grid Polarizer
- Patent Title (中): 具有无机,电介质网格偏振器的光学数据存储系统
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Application No.: US11469241Application Date: 2006-08-31
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Publication No.: US20080055720A1Publication Date: 2008-03-06
- Inventor: Raymond T. Perkins , Bin Wang , Eric Gardner , Douglas P. Hansen
- Applicant: Raymond T. Perkins , Bin Wang , Eric Gardner , Douglas P. Hansen
- Main IPC: G02B5/30
- IPC: G02B5/30

Abstract:
An optical data storage system includes a laser diode to produce at least one light beam. An inorganic, dielectric grid polarizing beam splitter is disposable in the light beam to transmit a polarized light beam, and includes a stack of film layers disposed over a substrate. Each film layer is formed of a material that is both inorganic and dielectric. Adjacent film layers have different refractive indices. At least one of the film layers is discontinuous to form a form birefringent layer with an array of parallel ribs with a pitch of less than 390 nm. A drive carries a disc medium disposed in the polarized light beam to reflect a modified light beam. The grid polarizer is disposable in the modified light beam to separate the modified light beam into a reflected beam and a transmitted beam. A photo-detector is disposable in the reflected or transmitted beam.
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