US4817124A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Charged particle high frequency laser
Assignee: Northwestern University
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Filing: 1986-09-05
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Granted: 1989-03-28
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Expires: 2006-09-05
Abstract
Abstract A high frequency laser for generating a coherent collimated beam in the ultraviolet to x-ray range using a high energy charged particle beam is provided. The laser utilizes an undulator which in one embodiment is a solid state superlattice composed of alternating layers of two materials have slightly different lattice spacing to provide strain modulation. A beam of charged particles is injected into the undulator to stimulate emission at short wavelengths in ultraviolet to hard x-ray range. The feedback required for lasing action is provided by Bragg diffraction involving the basic crystal lattice or other mirror device such as a superlattice mirror. In another embodiment, a dynamic undulator is used comprising infrared electromagnetic radiation. High energy Lithium ions are injected into the undulator resulting in stimulation of high frequency radiation. The feedback is provided by a superlattice mirror.
Inventors
- 👤 John B. Ketterson
- 👤 Slawomir A. Bogacz
- 👤 George K. Wong
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:48
CPC Classifications
H; H01; H01S; H01S4/00; H01S3/00; H01S3/09; H01S3/0903
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
79 words
Apparatus for producing coherent x-ray radiation comprising: source means for producing energetic charged particles; solid state undulator means comprising a solid state lattice with periodically alternating layers of a magnetic and a non-magnetic material having a periodicity of approximately 100 angstroms for providing a spatially periodic electromagnetic field having a periodicity short enough to stimulate x-ray radiation emission responsive to the charged particles moving through the undulator means electromagnetic fields; and means for providing feedback of the x-ray radiation.
Claim 2
Dependent Claim
79 words
Apparatus for producing coherent x-ray radiation comprising: source means for producing energetic charged particles; solid state undulator means comprising a solid state lattice with periodically alternating layers of a magnetic and a non-magnetic material having a periodicity of approximately 100 angstroms for providing a spatially periodic electromagnetic field having a periodicity short enough to stimulate x-ray radiation emission responsive to the charged particles moving through the undulator means electromagnetic fields; and means for providing feedback of the x-ray radiation.
Claim 3
Dependent Claim
12 words
The apparatus of claim 1 wherein the feedback is distributed reflective feedback.
Claim 4
Dependent Claim
18 words
The apparatus of claim 1 wherein the solid state undulator is a solid state superlattice with strain modulation.
Claim 5
Dependent Claim
24 words
The apparatus of claim 1 wherein said solid state lattice is a crystal lattice which provides distributed reflective feedback by means of Bragg diffraction.
Claim 6
Dependent Claim
91 words
Apparatus for producing coherent high frequency radiation electromagnetic radiation at a frequency higher than the frequency of visible light, comprising: source means for producing energetic charged particles; solid state undulator means comprising a crystal lattice of piezoelectric material excited by microwave energy to create a standing acoustic wave providing a time dependant spatially periodic alternating crystal field potential having a periodicity short enough to stimulate coherent high frequency electromagnetic radiation responsive to the charged particle moving through the undulator means; feedback means for providing feedback of the high frequency electromagnetic radiation.
Claim 7
Dependent Claim
91 words
Apparatus for producing coherent high frequency radiation electromagnetic radiation at a frequency higher than the frequency of visible light, comprising: source means for producing energetic charged particles; solid state undulator means comprising a crystal lattice of piezoelectric material excited by microwave energy to create a standing acoustic wave providing a time dependant spatially periodic alternating crystal field potential having a periodicity short enough to stimulate coherent high frequency electromagnetic radiation responsive to the charged particle moving through the undulator means; feedback means for providing feedback of the high frequency electromagnetic radiation.
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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) | 1992-03-27 | 1992-09-26 | 1993-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-03-27 | 1996-09-26 | 1997-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-03-27 | 2000-09-26 | 2001-03-28 | $7700.00 | Window Closed / Lapsed |