US3736518A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Maser incorporating crystal having f-centers
Assignee: RCA Corp
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Filing: 1971-11-22
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Granted: 1973-05-29
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Expires: 1991-11-22
Abstract
Abstract A maser incorporating a crystal having F-centers. The crystal, which may be an alkali halide such as KI, exhibits dichroism and may be pumped by selective absorption with circularly polarized light energy. The light energy is preferably derived from a diode laser, such as gallium aluminum arsenide, and has a wavelength coinciding with a point on the band edge of the optical absorption band of the crystal. Both a resonant cavity and a traveling wave configuration are disclosed.
Inventors
- 👤 C Anderson
- 👤 B Feingold
- 👤 E Sabisky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:00
CPC Classifications
H; H01; H01S; H01S1/00; H01S1/02
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
14 words
The maser defined in claim 1, wherein said crystal is composed of potassium iodide.
Claim 2
Dependent Claim
21 words
The maser defined in claim 2, wherein the density of said F-centers is in the order of 5 X 1017 centers/cm3.
Claim 3
Dependent Claim
37 words
The maser defined in claim 2, wherein said illuminating means includes means for illuminating said potassiuM iodide crystal with light energy which is circularly polarized in that direction which results in pumping said crystal by selective absorption.
Claim 4
Dependent Claim
14 words
The maser defined in claim 2, wherein said illuminating means comprises a laser diode.
Claim 5
Dependent Claim
17 words
The maser defined in claim 5, wherein said laser diode is a gallium aluminum arsenide laser diode.
Claim 6
Dependent Claim
39 words
The maser defined in claim 2, wherein said illuminating means illuminates said crystal with substantially monochromatic wave energy having a given wavelength coinciding with a point on the edge of the optical absorption band of said potassium iodide crystal.
Claim 7
Dependent Claim
14 words
The maser defined in claim 7, wherein said given wavelength is substantially 6900 Angstroms.
Claim 8
Dependent Claim
22 words
The maser defined in claim 8, wherein said illuminating means includes a gallium aluminum arsenide laser diode for generating said wave energy.
Claim 9
Dependent Claim
37 words
The maser defined in claim 1, wherein said illuminating means includes means for illuminating said alkali halide crystal with light energy which is circularly polarized in that direction which results in pumping said crystal by selective absorption.
Claim 10
Dependent Claim
14 words
The maser defined in claim 1, wherein said illuminating means comprises a laser diode.
Claim 11
Dependent Claim
17 words
The maser defined in claim 1, wherein said laser diode is a gallium aluminum arsenide laser diode.
Claim 12
Dependent Claim
39 words
The maser defined in claim 1, wherein said illuminating means illuminates said crystal with substantially monochromatic wave energy having a given wavelength coinciding with a point on the edge of the optical absorption band of said alkali halide crystal.
Claim 13
Dependent Claim
31 words
The maser defined in claim 1, further including a resonant cavity capable of supporting a microwave signal to be amplified by the maser, said maser crystal being located within said cavity.
Claim 14
Dependent Claim
30 words
The maser defined in claim 1, further including a slow-wave structure located in cooperative relationship with said maser crystal for supporting a traveling microwave to be amplified by said maser.
Claim 15
Dependent Claim
14 words
The maser defined in claim 15, wherein said slow-wave structure comprises a meander line.
Claim 16
Dependent Claim
13 words
The maser defined in claim 1, wherein said crystal is an alkali halide.
Claim 17
Dependent Claim
93 words
In an optically-pumped maser comprising a paramagnetic maser crystal adapted to be located in a given magnetic field and means for illuminating said maser crystal with light energy directed parallel to said given magnetic field to effect optical pumping of said maser crystal; the improvement wherein said maser crystal comprises an alkali halide crystal consisting of one of NaCl, NaBr, KCl, KBr, KI, RbBr, RbCl, CsBr and CsCl, said crystal incorporating a given density of F-centers which is sufficiently high for said one alkali halide crystal to operate as a paramagnetic maser crystal.
Claim 18
Dependent Claim
19 words
The maser defined in claim 18, wherein said given density is in the order of 5 X 1017 centers/cm3.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-05-28 | 1976-11-27 | 1977-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-28 | 1980-11-27 | 1981-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-28 | 1984-11-27 | 1985-05-29 | $7700.00 | Window Closed / Lapsed |