Coherent light generators – Free electron laser
Patent
1989-07-03
1991-03-12
Scott, Jr., Leon
Coherent light generators
Free electron laser
372 25, 315 5, H01S 300
Patent
active
049998390
ABSTRACT:
Apparatus and method are provided for causing different groups of particles from an accelerated electron or positron beam to interact exclusively in different sections of a free electron laser. The sections may be one or several amplifiers and an oscillator. The electron beam of a single accelerator used to excite a free electron laser is directed to traverse first an amplifier section or a sequence of amplifier sections and thereafter is directed into an oscillator section where the electron beam induces lasing. If the beam source is pulsed, this invention produces the proper time synchronization of electron and laser pulses. Specifically, delay times between optical pulses are employed among the oscillator and the amplifier or amplifiers to cause the laser to oscillate on the appropriate subharmonic or subharmonics of the accelerator repetition rate so that the intervening electron pulses are used only in the amplifier or amplifiers.
REFERENCES:
patent: 4740973 (1988-04-01), Madey et al.
patent: 4779277 (1988-10-01), Gorer et al.
patent: 4835446 (1989-05-01), Nation et al.
A. Bhowmik, et al., "Design Concept for a Common RF Accelerator Driven Free Electron Laser Master Oscillator/Power Amplifier", Nucl. Instr. & Meth., A272 (1988) 183-186.
S. V. Benson, et al., "Status Report on the Stanford Mark III IR FEL", Nucl. Instr. & Meth., A272 (1988) 22-28.
A. Bhowmik, et al., "First Operation of the Rocketdyne/Stanford FEL", Nucl. Instr. & Meth., (1988) 10-14.
W. B. Colson, et al., "Angular Gain Spectrum of Free Electron Lasers", Phys. Rev. A31, (1985) 828-842.
J. E. Sollid, et al., "Sideband Suppression in the Los Alamos FEL Using a Littrow Grating", Report LA-UR-88-3655, LANL P.O. Box 1663 MS J579, Los Alamos, N.M. 87545 (to be published in the proceedings of the 10th annual FEL conference, Jerusalem, 1988).
Allen Kenneth R.
Deacon Research
Jr. Leon Scott
Slone David N.
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