Coherent light generators – Free electron laser
Patent
1991-03-06
1992-05-26
Sikes, William L.
Coherent light generators
Free electron laser
372 6, 372 74, 372 94, H01S 300
Patent
active
051174316
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a laser device, and more particularly to a laser device in which a laser medium is excited by lights. Also, from another point of view, this invention relates to a synchrotron radiation (SR) utilizing device.
BACKGROUND OF ART
As laser devices, there are known those utilizing solids as the laser medium such as glass laser, semiconductor laser and those utilizing gases as the laser medium such as He-Ne laser, Ar laser, CO.sub.2 laser. In these lasers, the laser medium capable of emitting lights is excited by sole use exciting means such as high frequency electric power, current conduction, electric discharge, to generate laser lights.
Recently, synchrotron radiation (SR) devices have been attracting attention as short wavelength light sources. Electrons accelerated nearly to the light velocity are stored in a predetermined orbit, and SR lights generated in the tangential directions when electrons are bent by magnetic field, etc. are derived out as light outputs. The SR lights are generated in a continuous spectrum in a wide wavelength range.
SR light utilizing devices are set around the electron orbit through light beam lines which are disposed in the tangential directions of the orbit.
For example, tens of SR light utilizing devices can be disposed around a circular or elliptic electron orbit.
As is described above, sole use exciting means is provided in the conventional laser device for exciting laser medium. Also, in the conventional SR device, most of the SR lights which are not utilized are dissipated by impinging on the inner wall.
DISCLOSURE OF INVENTION
An object of this invention is to provide a synchrotron radiation excited laser capable of improving utilization efficiency of SR lights.
Another object of this invention is to provide a laser device of various wavelengths.
In a synchrotron radiation device, there are many lights which are not utilized and abandoned. By exciting a laser medium by these synchrotron radiation lights, a laser light can be taken out from the laser medium.
Referring to FIG. 1A, an electron orbit 1 is set in a synchrotron radiation device. A laser medium is disposed outside of the electron orbital 1. The electron orbit 1 and the laser medium 2 are disposed on the same plane.
SR lights generated from electrons moving in the electron orbit proceed in the tangential direction of the electron orbit 1, and irradiate the laser medium 2 which is disposed on the same plane as and outside of the electron orbit. The laser medium 2 irradiated by the SR lights is driven to an excited state and become light emissive. Here, when a stimulating light is introduced into the laser medium 2, stimulated emission occurs to generate a laser light.
By utilizing SR light which are usually thrown away in vain, to excite a laser medium, SR lights can be effectively utilized to obtain a laser light.
By utilizing SR lights, which form continuous wavelength light source, as an exciting source, monochromatic lights can be derived from various media.
Also, it become possible to use a laser medium which can not have been utilized by the lack of appropriate exciting means.
BRIEF DESCRIPTION OF THE DRAWINGS
FIGS. 1A, 1B and 1C show basic embodiments of this invention, wherein FIG. 1A is a plane view showing a plan structure, FIG. 1B is a cross section showing a fiber structure for the use of a solid medium, and FIG. 1C is a cross section showing a gas vessel structure for the use of a gas medium;
FIGS. 2A, 2B, 2C, and 2D show SR light excited laser devices according to embodiments of this invention, wherein FIG. 2A is a plan view showing a schematic plan structure, FIG. 2B is a cross section showing a structure of a fiber bundle, FIG. 2C schematically shows circular configuration of the laser medium and FIG. 2D schematic shows linear type configuration of the laser medium;
FIG. 3 is a schematic plan view showing a laser resonator formed of a fiber;
FIG. 4 schematically shows a laser device formed of a loop shaped circular fiber;
FIG. 5 schematically shows
REFERENCES:
patent: 3982200 (1976-09-01), Hoag et al.
patent: 4482843 (1984-11-01), Perring
patent: 4961201 (1990-10-01), Opower
Sikes William L.
Sumitomo Heavy Industrie's, Ltd.
Wise Robert E.
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