US5153670A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Holographic lippmann-bragg filter in a spectroscopic system
Assignee: Sanwa Bank California
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Filing: 1990-01-12
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Granted: 1992-10-06
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Expires: 2010-01-12
Abstract
Abstract A holographic filter comprises a volume hologram recorded with Bragg surfaces for use in spectroscopic and spectral splitting applications. The Bragg planes in the holographic filter can be recorded to satisfy virtually any design constraint imposed upon the filter such as Raman, Lippmann, non-Snellian (slanted), curved, and multiplexed spectral filters. The holographic filter achieves maximal reduction of secondary maxima and sidelobes and obtains large wavelength selectivities, and varied grating constants.
Inventors
- 👤 Tomasz P. Jannson
- 👤 Joanna L. Jannson
- 👤 Michael T. Feeney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 16:42
CPC Classifications
G; G02; G02B; G02B5/00; G02B5/32; G01; G01J; G01J3/00; G01J3/12; G01J3/18; G01J3/1838
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
81 words
A spectroscopic system for determining the characteristic wavelengths of a scattering medium, the system comprising a source for a laser beam of wavelength λ O , the laser beam incident upon the scattering medium, the scattering medium scattering the laser beam into characteristic wavelengths (λ 1 +λ 2 +λ 3 . . . ); a Lippmann Bragg hologram which rejects, by reflection, the wavelength λ 0 scattered from the scattering medium; and means for detecting the wavelengths unrejected by the hologram.
Claim 2
Dependent Claim
81 words
A spectroscopic system for determining the characteristic wavelengths of a scattering medium, the system comprising a source for a laser beam of wavelength λ O , the laser beam incident upon the scattering medium, the scattering medium scattering the laser beam into characteristic wavelengths (λ 1 +λ 2 +λ 3 . . . ); a Lippmann Bragg hologram which rejects, by reflection, the wavelength λ 0 scattered from the scattering medium; and means for detecting the wavelengths unrejected by the hologram.
Claim 3
Dependent Claim
86 words
A spectroscopic system for determining the characteristic wavelengths of a scattering medium in which a light beam of wavelength λ O is incident upon and scattered from the scattering medium into characteristic wavelengths (λ 1 +λ 2 +λ 3 . . . ), the system comprising: a source for the light beam; a volume holographic Lippmann Bragg filter positioned to receive light scattered from the scattering medium, the filter rejecting light of wavelength λ 0 and transmitting the characteristic wavelengths; means for detecting the transmitted wavelengths.
Claim 4
Dependent Claim
86 words
A spectroscopic system for determining the characteristic wavelengths of a scattering medium in which a light beam of wavelength λ O is incident upon and scattered from the scattering medium into characteristic wavelengths (λ 1 +λ 2 +λ 3 . . . ), the system comprising: a source for the light beam; a volume holographic Lippmann Bragg filter positioned to receive light scattered from the scattering medium, the filter rejecting light of wavelength λ 0 and transmitting the characteristic wavelengths; means for detecting the transmitted wavelengths.
Claim 5
Dependent Claim
15 words
The system as defined in claim 2 wherein the light beam is a laser beam.
Claim 6
Dependent Claim
13 words
The system as defined in claim 2 wherein the light beam is quasi-monochromatic.
Claim 7
Dependent Claim
88 words
A spectroscopic system for determining the characteristic wavelengths of a scattering medium in which light having wavelength λ O is incident upon and scattered from the scattering medium into characteristic wavelengths (λ 1 +λ 2 +λ 3 . . . ), the system comprising: a source for the light of wavelength λ 0 ; a volume holographic Lippmann Bragg filter positioned to receive light scattered from the medium, the filter rejecting scattered light of wavelength λ 0 and transmitting the characteristic wavelengths; means for detecting the transmitted wavelenghts.
Claim 8
Dependent Claim
88 words
A spectroscopic system for determining the characteristic wavelengths of a scattering medium in which light having wavelength λ O is incident upon and scattered from the scattering medium into characteristic wavelengths (λ 1 +λ 2 +λ 3 . . . ), the system comprising: a source for the light of wavelength λ 0 ; a volume holographic Lippmann Bragg filter positioned to receive light scattered from the medium, the filter rejecting scattered light of wavelength λ 0 and transmitting the characteristic wavelengths; means for detecting the transmitted wavelenghts.
Claim 9
Dependent Claim
89 words
A Raman spectroscopic system for determining the characteristic wavelenghts of a scattering medium in which light having wavelength λ 0 is incident upon and scattered from the scattering medium into characteristic wavelenghts (λ 1 +λ 2 +λ 3 . . . ), the system comprising; a source for the light of wavelength λ 0 ; a volume holographic Lippmann Bragg filter positioned to receive light scattered from the medium, the filter rejecting scattered light of wavelength λ 0 and transmitting the characteristic wavelenghts; means for detecting the transmitted wavelenghts.
Claim 10
Dependent Claim
89 words
A Raman spectroscopic system for determining the characteristic wavelenghts of a scattering medium in which light having wavelength λ 0 is incident upon and scattered from the scattering medium into characteristic wavelenghts (λ 1 +λ 2 +λ 3 . . . ), the system comprising; a source for the light of wavelength λ 0 ; a volume holographic Lippmann Bragg filter positioned to receive light scattered from the medium, the filter rejecting scattered light of wavelength λ 0 and transmitting the characteristic wavelenghts; means for detecting the transmitted wavelenghts.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-10-06 | 1996-04-06 | 1996-10-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-10-06 | 2000-04-06 | 2000-10-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-10-06 | 2004-04-06 | 2004-10-06 | $7700.00 | Window Closed / Lapsed |