Coherent light generators – Free electron laser
Patent
1979-11-09
1982-05-25
Sikes, William L.
Coherent light generators
Free electron laser
372 37, 372 20, 372 26, H01S 309
Patent
active
043319360
ABSTRACT:
The generation of very high power pulses of coherent electromagnetic radiation that are continuously tunable in frequency is accomplished by means of a free electron laser in which a hollow relativistic electron beam is projected along the longitudinal axis of an evacuated drift tube. A first magnetic field expands the electron beam into an annular peripheral interaction region of the drift tube where the beam interacts with a second periodic radial magnetic field. Frequency is varied by changing the electron velocity of the electron beam or by changing the periodicity of the radial magnetic field. The device can be made to operate as an oscillator by the inclusion of resonant cavity defining mirrors within the interaction region, or as an amplifier by injecting a coherent radiation signal into the interaction region. Both oscillator and amplifier functions can be incorporated into a single device. Linewidth is narrowed by utilizing a Smith-Fox interferometer to couple the generated coherent radiation into an output light pipe.
REFERENCES:
patent: 3789257 (1974-01-01), Friedman et al.
patent: 3958189 (1976-05-01), Sprangle et al.
"High-Power Free-Electron Laser Based on Stimulated Raman Backscattering", by McDermott et al., Phys. Rev. Lett., vol. 41, No. 20, (Nov. 13, 1978).
"Strong Submillimeter Radiation From Intense Relativistic Electron Beams", by Granatstein et al., IEEE Transt. on Microwave Theory and Techniques, vol. MTT-22, No. 12, Dec. 74.
"Multiple Gas E-Beam Pumped Lasers", by Dreyfus, IBM Tech. Dis. Bull., vol. 22, No. 9, (Feb. 78).
"Shock-Wave Introduction of Gas Into Relativistic E-Beam Pumped Lasers and Drift Tubes", App. Phys. Lett., vol. 29, No. 6, pp. 348-350, (Sep. 15, 1976).
Efthimion Philip C.
Granatstein Victor L.
Marshall Thomas C.
McDermott David B.
Parker Robert K.
Jr. Leon Scott
Matthews, Jr. Willard R.
Sikes William L.
Singer Donald J.
The United States of America as represented by the Secretary of
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