US5221957A
Expired / Lapsed
US
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Nonuniform holographic filter in a spectroscopic system
Assignee: Sanwa Bank California
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Filing: 1992-06-19
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Granted: 1993-06-22
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Expires: 2012-06-19
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 14:07
CPC Classifications
G; G01; G01J; G01J3/00; G01J3/12; G01J3/18; G01J3/1838; G02; G02B; G02B5/00; G02B5/32
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
58 words
A system comprising: a source of polychromatic light; a holographic Lippmann-Bragg filter having grating constant vertical nonuniformity which splits said polychromatic light into two or more parts so that one or more spectral bands are rejected and the transmitted spectrum is smooth with reduced secondary mixture; and means for detecting the spectrum of light transmitted by said filter.
Claim 2
Independent Claim
58 words
A system comprising: a source of polychromatic light; a holographic Lippmann-Bragg filter having grating constant vertical nonuniformity which splits said polychromatic light into two or more parts so that one or more spectral bands are rejected and the transmitted spectrum is smooth with reduced secondary mixture; and means for detecting the spectrum of light transmitted by said filter.
Claim 3
Independent Claim
57 words
A system comprising: a source of polychromatic light; a holographic Lippmann-Bragg filter having grating constant vertical nonuniformity which splits said polychromatic light into two or more parts so that one or more spectral bands are rejected and the transmitted spectrum is smooth with reduced sidelobes; and means for detecting the spectrum of light transmitted by said filter.
Claim 4
Independent Claim
57 words
A system comprising: a source of polychromatic light; a holographic Lippmann-Bragg filter having grating constant vertical nonuniformity which splits said polychromatic light into two or more parts so that one or more spectral bands are rejected and the transmitted spectrum is smooth with reduced sidelobes; and means for detecting the spectrum of light transmitted by said filter.
Claim 5
Dependent Claim
91 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 0 , 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 volume hologram having a grating constant which is nonuniform in the vertical direction, which rejects, by reflection, the wavelength λ 0 scattered from the scattering medium; and means for detecting the wavelengths unrejected by the hologram.
Claim 6
Dependent Claim
91 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 0 , 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 volume hologram having a grating constant which is nonuniform in the vertical direction, which rejects, by reflection, the wavelength λ 0 scattered from the scattering medium; and means for detecting the wavelengths unrejected by the hologram.
Claim 7
Dependent Claim
95 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 0 , the laser beam incident upon the scattering medium, the scattering medium scattering the laser beam into characteristic wavelengths (λ 1 +λ 2 +λ 3 . . . ); volume holographic filter means having multiplexed sets of Bragg holograms, each set having a distinct grating constant, which rejects, by reflection, the wavelength λ 0 scattered from the scattering medium; and means for detecting the wavelenghts unrejected by the Bragg holograms.
Claim 8
Dependent Claim
95 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 0 , the laser beam incident upon the scattering medium, the scattering medium scattering the laser beam into characteristic wavelengths (λ 1 +λ 2 +λ 3 . . . ); volume holographic filter means having multiplexed sets of Bragg holograms, each set having a distinct grating constant, which rejects, by reflection, the wavelength λ 0 scattered from the scattering medium; and means for detecting the wavelenghts unrejected by the Bragg holograms.
Claim 9
Dependent Claim
85 words
A spectroscopic system for determining the characteristic wavelengths of a scattering medium in which a light beam of wavelength λ 0 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 hologram having a grating constant which is nonuniform in the vertical direction, the hologram rejecting light of wavelength λ 0 and transmitting the characteristic wavelengths; means for detecting the transmitted wavelengths.
Claim 10
Dependent Claim
85 words
A spectroscopic system for determining the characteristic wavelengths of a scattering medium in which a light beam of wavelength λ 0 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 hologram having a grating constant which is nonuniform in the vertical direction, the hologram rejecting light of wavelength λ 0 and transmitting the characteristic wavelengths; means for detecting the transmitted wavelengths.
Claim 11
Dependent Claim
88 words
A spectroscopic system for determining the characteristic wavelengths of a scattering medium in which a light beam of wavelength λ 0 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; volume holographic filter means having multiplexed sets of Bragg holograms, each set having a distinct grating constant, the filter rejecting light of wavelength λ 0 and transmitting the characteristic wavelengths; means for detecting the transmitted wavelengths.
Claim 12
Dependent Claim
88 words
A spectroscopic system for determining the characteristic wavelengths of a scattering medium in which a light beam of wavelength λ 0 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; volume holographic filter means having multiplexed sets of Bragg holograms, each set having a distinct grating constant, the filter rejecting light of wavelength λ 0 and transmitting the characteristic wavelengths; means for detecting the transmitted wavelengths.
Claim 13
Dependent Claim
15 words
The system as defined in claim 6 wherein the light beam is a laser beam.
Claim 14
Dependent Claim
13 words
The system as defined in claim 6 wherein the light beam is quasi-monochromatic.
Claim 15
Dependent Claim
93 words
A Raman spectroscopic system for determining the characteristic wavelengths of a scattering medium in which light having wavelength λ 0 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 wavelengh λ 0 ; a holographic filter including a volume hologram having a grating constant which is nonuniform in the vertical direction, the filter rejecting scattered light of wavelength λ 0 and transmitting the characteristic wavelengths; means for detecting the transmitted wavelengths.
Claim 16
Dependent Claim
93 words
A Raman spectroscopic system for determining the characteristic wavelengths of a scattering medium in which light having wavelength λ 0 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 wavelengh λ 0 ; a holographic filter including a volume hologram having a grating constant which is nonuniform in the vertical direction, the filter rejecting scattered light of wavelength λ 0 and transmitting the characteristic wavelengths; means for detecting the transmitted wavelengths.
Claim 17
Dependent Claim
17 words
The system as defined in claim 9 wherein the refractive index profile of the filter is quai-rectangular.
Claim 18
Dependent Claim
20 words
The system as defined in claim 9 wherein the refractive index profile of the filter has varying bias or amplitude.
Claim 19
Dependent Claim
92 words
A Raman spectroscopic system for determining the characteristic wavelengths of a scattering medium in which light having wavelength λ 0 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 ; volume holographic filter means having multiplexed sets of Bragg holograms, each set having a distinct grating constant, the filter rejecting scattered light of wavelength λ 0 and transmitting the characteristic wavelengths; means for detecting the transmitted wavelengths.
Claim 20
Dependent Claim
92 words
A Raman spectroscopic system for determining the characteristic wavelengths of a scattering medium in which light having wavelength λ 0 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 ; volume holographic filter means having multiplexed sets of Bragg holograms, each set having a distinct grating constant, the filter rejecting scattered light of wavelength λ 0 and transmitting the characteristic wavelengths; means for detecting the transmitted wavelengths.
References Cited (Backward Citations)
US5026131A
Cited
US5112127A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-06-21 | 1996-12-21 | 1997-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-06-21 | 2000-12-21 | 2001-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-06-21 | 2004-12-21 | 2005-06-22 | $7700.00 | Window Closed / Lapsed |