Coherent light generators – Free electron laser
Patent
1990-02-13
1991-05-21
Scott, Jr., Leon
Coherent light generators
Free electron laser
H01S 300
Patent
active
050181491
ABSTRACT:
In a free-electron laser oscillator, two laser beams having different wavelengths are irradiated to a photoemitter to generate an electron beam. The electron beam is density-modulated by a frequency corresponding to a difference between frequencies of the two laser beams, and accelerated to a vicinity of light velocity by a microwave. Such a relative theory electron beam is directed into a periodical magnetic field generated by a helical wigglar and a track thereof is deflected. As a result, a synchrotron radiation light is generated from the relative theory electron beam. The radiation light generates an electromagnetic field by itself. Thus, electromagnetic interaction takes place among the electromagnetic field, the periodical magnetic field and the relative theory electron beam, and the laser oscillation is started. A power of the laser beam irradiated to the photoemitter may be reduced because the two laser beams having different wavelengths are irradiated to the photoemitter and the electron beam is bunched in accordance with the difference between frequencies.
REFERENCES:
Fraser et al., "High-Brightness Photoemitter Injector For Electron Accelerators", IEEE Transactions on Nuclear Science, vol. NS-32, No. 5, Oct. 1985, pp. 1791-1793.
Boussoukaya et al., "Pulsed Photocurrents Form Lanthanum Hexaboride Cathodes In The ns Regime", Nuclear Instruments and Methods in Physics Research A264 (1988) 131-134, North-Holland, Amsterdam, pp. 131-134.
Boussoukaya et al., "High Quantum Yield From Photofield Emitters", Nuclear Instruments and Methods in Physics Research A279 (1989) 405-409.
Hamamatsu Photonics K.K.
Jr. Leon Scott
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