Patent US4449219A successfully refreshed from Google Patents.
US4449219A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Free electron laser
Assignee: Individual
•
Filing: 1979-07-06
•
Granted: 1984-05-15
•
Expires: 1999-07-06
Abstract
Abstract The invention involves a free electron laser having reduced sensitivity to variations in the energy of the input electrons. This effect is achieved by first laterally dispersing the electrons in accordance with their energies and thereafter injecting the dispersed electrons with angular and/or lateral variations to alternate polarity deflecting means.
Inventors
- 👤 Todd I. Smith
- 👤 Luis R. Elias
- 👤 John M. J. Madey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 22:05
CPC Classifications
H; H01; H01S; H01S3/00; H01S3/09; H01S3/0903
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
63 words
A free electron laser which comprises means for directing a relativistic electron beam along a predetermined path, means for dispersing electrons laterally and/or angularly in response to energy differences thereof, and means disposed along said path for periodically deflecting the dispersed electrons transversely relative to said path in alternating opposite directions, said deflecting means establishing fields which vary between paths of dispersed electrons.
Claim 2
Dependent Claim
63 words
A free electron laser which comprises means for directing a relativistic electron beam along a predetermined path, means for dispersing electrons laterally and/or angularly in response to energy differences thereof, and means disposed along said path for periodically deflecting the dispersed electrons transversely relative to said path in alternating opposite directions, said deflecting means establishing fields which vary between paths of dispersed electrons.
Claim 3
Dependent Claim
25 words
A free electron laser according to claim 1 wherein said dispersing means constitutes magnetic means arranged to effect dispersion of the electrons of differing energies.
Claim 4
Dependent Claim
30 words
A free electron laser according to claim 1 wherein said deflecting means includes a plurality of aligned magnets with alternate magnets having opposite polarity and arranged to establish transverse gradients.
Claim 5
Dependent Claim
24 words
A free electron laser according to claim 3 wherein said magnets have pole faces which diverge transversely of the path of said electron beam.
Claim 6
Dependent Claim
35 words
A free electron laser according to claim 1 wherein said deflecting means includes a plurality of aligned magnets with alternate magnets having opposite polarity and said magnets being arranged with different periodicities at transverse positions.
Claim 7
Dependent Claim
41 words
A free electron laser according to claim 1 wherein said deflecting means includes a plurality of aligned like magnets with opposed parallel pole faces, and said electrons enter the magnets angularly relative to the optical axis defined by said deflecting magnets.
Claim 8
Dependent Claim
18 words
A free electron laser according to claim 1 which comprises electron accelerator means for generating the electron beam.
Claim 9
Dependent Claim
25 words
A free electron laser according to claim 1 which comprises means for recirculating the electrons after their traverse of said path through said deflecting means.
Claim 10
Dependent Claim
27 words
In combination with a free electron laser according to claim 1, external means for generating a beam of radiation along said predetermined path to provide amplification thereof.
Claim 11
Dependent Claim
46 words
In a free electron laser utilizing an input beam of electrons dispersed transversely in accordance with their individual energies, means disposed along the electron beam path for periodically deflecting the electrons in opposite directions, said deflecting means establishing fields which vary between paths of dispersed electrons.
Claim 12
Dependent Claim
46 words
In a free electron laser utilizing an input beam of electrons dispersed transversely in accordance with their individual energies, means disposed along the electron beam path for periodically deflecting the electrons in opposite directions, said deflecting means establishing fields which vary between paths of dispersed electrons.
Claim 13
Dependent Claim
100 words
A free electron laser according to claim 1 wherein the electron energy equals γ r mc 2 where m is the mass of the particle, c is the velocity of light, and ##EQU3## wherein λ q is the magnet period, λ is the optical wavelength, B is the magnetic field amplitude, θ is the angle between the propagation vector of the optical radiation and the average velocity of the electrons through the magnetic array, α 2 is a constant determined by magnet geometry, and the product of α 2 B 2 approximates unity for magnetic fields of a few kilogauss.
References Cited (Backward Citations)
US3822410A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-05-15 | 1987-11-14 | 1988-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-15 | 1991-11-14 | 1992-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-15 | 1995-11-14 | 1996-05-15 | $7700.00 | Window Closed / Lapsed |