Title:
PLATE-TYPE BROADBAND DEPOLARIZING BEAM SPLITTER
Document Type and Number:
WIPO Patent Application WO/2011/048875
Kind Code:
A1
Abstract:
Disclosed is a plate-type broadband depolarizing beam splitter which can be used in a wide wavelength band, and which can achieve improved yield and lowered manufacturing costs with little dependence on angle of incidence and with a small number of films. A beam splitter for splitting luminous flux by inputting a light beam, wherein both main surfaces of a flat plate-shaped transparent glass substrate are optically polished, and one main surface of the transparent glass substrate has provided thereon: a wavelength band expanding film; a metallic film provided on the wavelength band expanding film; and a depolarizing film provided on the metallic film. The light beam is depolarized by means of the depolarizing film when said light beam is input to the beam splitter, and the desired transmittance and reflectance are achieved when the depolarised light is input to the metallic film. Thus, in terms of the wavelengths of light transmitted by the metallic film, the band in which the beam splitter can be used is expanded by the wavelength band expanding film.
Inventors:
AOSHIMA TOSHIAKI (JP)
Application Number:
PCT/JP2010/065161
Publication Date:
April 28, 2011
Filing Date:
September 03, 2010
Export Citation:
Assignee:
SIGMA KOKI CO LTD (JP)
AOSHIMA TOSHIAKI (JP)
AOSHIMA TOSHIAKI (JP)
International Classes:
G02B5/08; B32B7/02; B32B9/00; B32B15/04; B32B17/06
Foreign References:
| JPH06317703A | 1994-11-15 | |||
| JPH0220801A | 1990-01-24 | |||
| JPS6028603A | 1985-02-13 | |||
| JPS6064304A | 1985-04-12 | |||
| JP2007133375A | 2007-05-31 | |||
| JPH05142499A | 1993-06-11 | |||
| JP2002071946A | 2002-03-12 | |||
| JPS638702A | 1988-01-14 | |||
| JPH0943408A | 1997-02-14 | |||
| JPH05297207A | 1993-11-12 |
Other References:
See also references of EP 2520955A4
H. A. MACLEOD: "Optical Thin Film", 30 November 1989, ISSUER NIKKAN KOGYO SHIMBUN, LTD.
H. A. MACLEOD: "Optical Thin Film", 30 November 1989, ISSUER NIKKAN KOGYO SHIMBUN, LTD.
Attorney, Agent or Firm:
ANIYA Setuo et al. (JP)
Ani store Setsuo (JP)
Ani store Setsuo (JP)
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