US3680945A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fabrication of refractive blazed holograms
Assignee: Xerox Corp
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Filing: 1970-10-23
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Granted: 1972-08-01
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Expires: 1990-10-23
Abstract
Abstract Methods and apparatus for fabricating refractive blazed holograms having high single image diffraction efficiencies. A reflective blazed hologram made with a single wavelength light source may be modified for high blazed efficiencies at any desired wavelength. A reflective blazed hologram surface is replicated onto the surface of a material of higher refractive index, with a shorter wavelength of light utilized fore reconstruction. A further embodiment is to replicate a reflective blazed hologram onto the surface of a material that can be made to undergo an isotropic dimension increase or decrease. When the desired dimension change has taken place, the blazed surface thereof would again be replicated onto the surface of a suitable transparent material of the proper refractive index. Thus, refractive blazed holograms blazed for any wavelength can be obtained.
Inventors
- 👤 Nicholas K Sheridon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:15
CPC Classifications
G; G03; G03H; G03H1/00; G03H1/04; G03H1/18; G03H1/02; G03H1/024; G03H1/0244; G03H1/0486; G03H1/22; G03H1/2202; G03H2001/2223; G03H2001/2231; G03H2001/2234; G03H2250/00; G03H2250/36; G03H2260/00; G03H2260/14; G03H2260/50; G03H2260/63; Y; Y10; Y10S; Y10S359/00; Y10S359/90; Y10S430/00; Y10S430/146
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
34 words
The method as set forth in claim 1 further including: illuminating said blazed hologram on said second substrate with a light beam of a different wavelength than utilized to construct said reflective blazed hologram.
Claim 2
Dependent Claim
124 words
The method as set forth in claim 2 wherein said second refractive index is higher than said first refractive index and wherein said step of illuminating comprises: reconstructing the holographic image on said refractive blazed hologram by transmitting said second wavelength light beam through said refractive hologram, said second wavelength light beam being shorter in wavelength than said first wavelength light beam, and wherein said first and said second wavelengths correspond to the following relationship: where lambda 1 is the blaze wavelength of said reflective blazed hologram having a diffraction angle theta 1 for Normal incidence, lambda 2 is the blaze wavelength of said refractive blazed hologram having a diffraction angle theta 2 for normal incidence and Mu 2 is said second refractive index.
Claim 3
Dependent Claim
7 words
The blazed surface product of claim 1.
Claim 4
Independent Claim
139 words
The method of producing a refractive blazed hologram comprising the steps of: replicating a reflective blazed hologram on a first substrate with a first refractive index onto a material that can be made to undergo an isotropic dimension change, and activating said isotropic dimension change in said material, and further replicating said blazed surface or said material of changed dimension onto a second substrate with a second refractive index wherein said reflective blazed hologram and said refractive blazed hologram have the following relationship: wherein lambda 1 is the blaze wavelength of said reflective blazed hologram having a diffraction angle theta 1 for normal incidence, lambda 2 is the blaze wavelength of said refractive blazed wavelength having a diffraction angle theta 2 for normal incidence, Mu 2 is said second refractive index and M is the factor of dimension change.
Claim 5
Dependent Claim
22 words
The method as set forth in claim 5 wherein said step of activating comprises: exposing said material to vapors of activating fluids.
Claim 6
Dependent Claim
20 words
The method as set forth in claim 5 wherein said step of activating comprises: exposing said material to activating radiation.
Claim 7
Dependent Claim
25 words
The method as set forth in claim 5 wherein said step of activating comprises: immersing said material in an activating liquid such as a solvent.
Claim 8
Dependent Claim
41 words
The method as set forth in claim 5 further including: directing through said second substrate a reconstruction beam of coherent radiation of different wavelength than the construction beam of said reflective blazed hologram in order to transmit the holographic image thereon.
Claim 9
Dependent Claim
77 words
The method as set forth in claim 9 wherein said step of directing includes the step of reconstructing said holographic image according to the following relationship: where M is the factor of dimension change, lambda 1 is said wavelength of said construction beam forming a hologram having a diffraction angle theta 1 for normal incidence, lambda 2 is said wavelength of said reconstruction beam diffracted at angle theta 2, and Mu 2 is said second refractive index.
Claim 10
Independent Claim
129 words
The method of producing a reflective hologram blazed at a second light wavelength from a reflective hologram blazed at a first light wavelength comprising the steps of: replicating said first reflective hologram blazed at said first light wavelength onto a material that can be made to undergo an isotropic dimension change, activating said isotropic dimension change in said material, and further replicating said blazed surface on said material of changed dimension onto a surface to form said reflective blazed hologram blazed at said second light wavelength wherein the blaze wavelengths of said reflective holograms have the following relationship: where lambda 1 is the blaze wavelength of said first reflective hologram, lambda 2 is the blaze wavelength of said second reflective hologram and M is the factor of dimension change.
Claim 11
Dependent Claim
26 words
The method as set forth in claim 11 further including: coating said blazed surface of said second reflective hologram with a high efficiency light reflecting material.
Claim 12
Dependent Claim
10 words
The blazed surface product of the method of claim 11.
Claim 13
Dependent Claim
10 words
The blazed surface product of the method of claim 12.
Claim 14
Dependent Claim
47 words
The method as set forth in claim 11 further including: reconstructing the holographic image on said second reflective hologram according to the following relationship: where M is the factor of dimension change, lambda 1 is said first light wavelength, and lambda 2 is said second light wavelength.
Claim 15
Dependent Claim
163 words
A reconstruction imaging method comprising the stePs of: a. directing an object modulated beam of coherent radiation at one face of a photohardenable layer with a first refractive index; b. further directing a reference beam of coherent radiation, coherent with the coherent radiation of said object modulated beam, at the other face of said layer to create a standing wave pattern in and at one face of said layer to create a corresponding change in and at said one face of said layer in resistence to a solvent; c. subjecting said one face of said layer to a solvent for the relatively less hardened portions of said layer to create a blazed surface on said layer; d. replicating said blazed surface into the surface of a second layer with a second refractive index; and e. further directing through said second layer a reconstruction beam of coherent radiation of different wavelengths than said object modulated and reference beams to transmit the holographic image thereon.
Claim 16
Dependent Claim
154 words
The method as set forth in claim 16 wherein the step of replicating comprises: further replicating said blazed photohardenable layer surface onto a material that can be made to undergo an isotropic dimension change, activating said isotropic dimension change in said material and further replicating said blazed surface on said material of changed dimension onto said surface of said second layer with said second refractive index, wherein said blazed surface layer having a first refractive index and said blazed surface layer having a second refractive index have the following relationship: wherein lambda 1 is the blaze wavelength of said blazed surface having a first refractive index having a diffraction angle theta 1 for normal incidence, lambda 2 is the blaze wavelength of said blazed surface having a second refractive index having a diffraction angle theta 2 for normal incidence, Mu 2 is said second refractive index and M is the factor of dimension change.
Claim 17
Independent Claim
130 words
The method of producing a refractive blazed hologram comprising the step of: replicating a reflective blazed hologram on a first substrate with a first refractive index into a second substrate with a second refractive index, wherein said second refractive index is higher than said first refractive index, wherein the blaze wavelength of said refractive blazed hologram is shorter than the blaze wavelength of said reflective blazed hologram and said refractive blazed hologram and said reflective blazed hologram have the following relationship: where lambda 1 is the blaze wavelength of said reflective blazed hologram having a diffraction angle theta 1 for normal incidence, lambda 2 is the blaze wavelength of said refractive blazed hologram having a diffraction angle theta 2 for normal incidence and Mu 2 is said second refractive index.
References Cited (Backward Citations)
GB1139955A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-01 | 1976-01-31 | 1976-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-01 | 1980-01-31 | 1980-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-01 | 1984-01-31 | 1984-08-01 | $7700.00 | Window Closed / Lapsed |