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US5383038A
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Holographic optical memory using semiconductor microcrystallite doped glasses and method using same
Assignee: INTELLECUTAL PROPERTY DEVELOPMENT
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Filing: 1993-07-13
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Granted: 1995-01-17
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Expires: 2013-07-13
Abstract
Abstract There is described a semiconductor microcrystallite doped glass that exhibits SHG, and a method of preparing, or encoding, a semiconductor microcrystallite doped glass by the simultaneous injection of fundamental and second harmonic fields, such as 1.06 μm and 532 nm. More specifically, the disclosure pertains to a structure that exhibits SHG, the structure being comprised of, by example, borosilicate glass that contains CdS x Se 1-x microcrystallites. Also disclosed are embodiments of devices having an optical waveguide structure formed within a glass substrate that contains semiconductor microcrystallites. The optical waveguide structure guides and contains injected radiation and also converts a portion thereof to the second harmonic. Also disclosed are optoelectronic devices that include frequency doublers, self-doubling lasant material, bichromatic optical switches, and a volume holographic medium, all of which include a glass host having semiconductor microcrystallites embedded within.
Inventors
- 👤 Nabil M. Lawandy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:56
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/004; G11B7/0065; C; C03; C03C; C03C14/00; C03C14/006; C03C23/00; C03C23/0005; G02; G02F; G02F1/00; G02F1/35; G02F1/355; G02F1/3555; G02F1/365; G02F1/37; G02F1/377; G03; G03H; G03H1/00; H; H01; H01S; H01S3/00; H01S3/14; H01S3/16; H01S3/17; C03C2214/00; C03C2214/16; G02F1/29; G02F1/31; G02F1/313; G02F1/3132; G02F1/3515; G02F1/3517; G02F2201/00; G02F2201/30; G02F2201/307; G03H1/02; G03H2001/026; G03H2001/0268; H01S3/10; H01S3/106; H01S3/108; H01S3/109; H01S5/00; H01S5/30
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
13 words
A volume holographic medium comprising a bulk glass having semiconductor microcrystallites embedded within.
Claim 2
Dependent Claim
13 words
A volume holographic medium comprising a bulk glass having semiconductor microcrystallites embedded within.
Claim 3
Independent Claim
81 words
A method of operating a holographic memory, comprising the steps of: providing a holographic medium comprising a bulk glass having semiconductor microcrystallites contained within; recording information within the volume holographic medium by irradiating a region of the holographic medium with radiation having a first wavelength and a second wavelength, the second wavelength being one half of the first wavelength; and reading out the information by irradiating the region with the first wavelength, the information being read-out at the second wavelength. ,
Claim 4
Independent Claim
81 words
A method of operating a holographic memory, comprising the steps of: providing a holographic medium comprising a bulk glass having semiconductor microcrystallites contained within; recording information within the volume holographic medium by irradiating a region of the holographic medium with radiation having a first wavelength and a second wavelength, the second wavelength being one half of the first wavelength; and reading out the information by irradiating the region with the first wavelength, the information being read-out at the second wavelength. ,
Claim 5
Dependent Claim
17 words
A method as set forth in claim 2 and including a further step of erasing the information.
Claim 6
Dependent Claim
43 words
A method as set forth in claim 3 wherein the step of erasing includes a step of irradiating the region with radiation having the first wavelength, the second wavelength, or a third wavelength selected to pump the bandgap energy of the semiconductor microcrystallites.
Claim 7
Dependent Claim
20 words
A method .as set forth in claim 3 wherein the step of erasing includes a step of heating the medium.
Claim 8
Dependent Claim
50 words
A volume holographic medium, comprising a centrosymmetric glass doped with semiconductor microcrystallites, said medium having an input face for receiving a readout beam having a first wavelength and an output face for emitting an output beam having a second wavelength, wherein the second wavelength is one-half of the first wavelength.
Claim 9
Dependent Claim
50 words
A volume holographic medium, comprising a centrosymmetric glass doped with semiconductor microcrystallites, said medium having an input face for receiving a readout beam having a first wavelength and an output face for emitting an output beam having a second wavelength, wherein the second wavelength is one-half of the first wavelength.
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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) | 1998-01-16 | 1998-07-18 | 1999-01-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-01-16 | 2002-07-18 | 2003-01-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-01-16 | 2006-07-18 | 2007-01-17 | $7700.00 | Window Closed / Lapsed |