JPH05273395A - Luminous device - Google Patents

Abstract

PURPOSE:To obtain a luminous device, of low demand of power, capable of changing a wavelength by an electron beam with a small structure, by transmitting the electron beam near the surface of a diffraction grating or dielectric to cause wake light or the Cherenkov light to emit. CONSTITUTION:Electrons emitted at a negative electrode part 1 are accelerated into a uniform electron beam 3 and collimated in the electromagnetic field of an electromagnetic field generating part 4, and become about 100keV. The accelerated beam 3 emits electromagnetic waves by the Cherenkov radiation when passing through the surface of a dielectric resonator 5, and by a reflecting mirror 6 the electromagnetic waves go and return within the resonator 5. The electromagnetic waves and the beam 3 within the resonator 5 further act each other, the beam 3 is decelerated, and the electromagnetic waves are amplified. At this time, near infrared or visible radiation capable of changing a wavelength is obtained by controlling the speed of the beam 3, if the radius of the beam 3 is not more than several micrometers, and the distance between the beam 3 and the surface of the resonator 5 is at most a micrometer. Wake radiation is carried out if a diffraction grating is used instead of the resonator 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light emitting device using an electron beam.

[0002]

2. Description of the Related Art FIG. 3 shows a conventional light emitting device using an electron beam. Reference numeral 21 is an electron beam passing through a part of the synchrotron device, 22 is a deflection magnet and a quadrupole magnet for deflecting and converging the electron beam, 23 is a wiggler magnetic field generating section for causing the electron beam to meander, and 24 is an electron beam. It is a reflecting mirror for resonating the light generated by the meandering movement of.

In the conventional light emitting device configured as described above, when the electron beam 21 passes through the wiggler magnetic field 23 while meandering, the electron beam 21 interacts with the emitted electromagnetic wave, and the electron beam 21 is decelerated. Causes stimulated emission in which the electromagnetic wave is amplified, and the reflection mirror 24 causes laser oscillation. Further, the oscillation wavelength can be controlled by changing the energy of the electron beam or the wiggler magnetic field.

[0004]

However, in the above structure, it is necessary to make the electron beam 21 have high energy with a relativistic velocity, and the device for that purpose becomes a very large-scaled device such as the whole room. However, it has a problem that it is expensive, difficult to move, and has high power consumption.

In view of the above points, an object of the present invention is to provide a light emitting device of low energy, very small structure, variable length by electron beam, and low power consumption.

[0006]

A micro field emission type cold cathode portion for emitting an electron beam, and an electromagnetic field generating portion for collimating the electron beam emitted from the cathode portion,
A light emitting device including a dielectric provided near the path of the collimated electron beam is configured.

[0007]

According to the present invention, with the above-described structure, the wake light or the Cherenkov light is emitted by passing the electron beam within a few micrometers near the surface of the diffraction grating or the dielectric, and the radius of the electron beam emitted from the cathode part is changed. By performing collimation to a value of several micrometers or less, near-infrared or visible light stimulated wake radiation or Cherenkov radiation is obtained.

[0008]

1 is a block diagram of a light emitting device according to a first embodiment of the present invention. 1 is a micro-cathode part which emits electrons, 2 is an anode part, 3 is an electron beam, 4 is an electromagnetic field generating part for accelerating and collimating the emitted electron beam, 5 is a dielectric resonator part, and 6 is a reflecting mirror Is.

The operation of the light emitting device of the first embodiment constructed as above will be described below. The electrons emitted from the cathode part 1 are accelerated and collimated into a uniform electron beam by the electromagnetic field of 4 and become about 100 keV. When the accelerated electron beam 3 passes through the surface of the dielectric resonator, Cherenkov radiation emits an electromagnetic wave, and the reflector 6 causes the electromagnetic wave to reciprocate in the dielectric resonator. The electromagnetic wave in the resonator further interacts with the electron beam, the velocity of the electron beam is reduced, and the electromagnetic wave is amplified. At this time, if the radius of the electron beam is several micrometers or less and the distance between the electron beam and the surface of the dielectric resonator is 1 micrometer or less, the speed of the electron beam is controlled so that the variable length near-infrared or visible Light is obtained.

As described above, according to the first embodiment, the current by the electron beam is 50 microamps, the length of the dielectric resonator is 1 mm, and the distance between the electron beam and the surface of the dielectric resonator is 1 micrometer. In this case, it was possible to obtain light with a wavelength of 10 micrometers.

FIG. 2 shows a block diagram of a light emitting device in a second embodiment of the present invention. 11 is a micro cathode for emitting electrons, 12 is an anode, 13 is an electron beam, 14
Is an electromagnetic field generating unit for accelerating and collimating the emitted electron beam, 15 is a diffraction grating unit, and 16 is a reflecting mirror.

The operation of the light emitting device of the second embodiment having the above structure will be described below. Cathode part 11
The electrons emitted at 14 are accelerated and collimated into a uniform electron beam by 14 electromagnetic fields and become about 100 keV. When the accelerated electron beam 13 passes through the surface of the diffraction grating, it emits an electromagnetic wave due to wake radiation, and the reflecting mirror 16 causes the electromagnetic wave to reciprocate on the surface of the diffraction grating. The electromagnetic wave in the resonator further interacts with the electron beam, the velocity of the electron beam is reduced, and the electromagnetic wave is amplified. At this time, if the radius of the electron beam is several micrometers or less and the distance between the electron beam and the surface of the diffraction grating is 1 micrometer or less, the speed of the electron beam is controlled so that a variable-length near-infrared or visible light is emitted. can get.

As described above, also in the second embodiment, it was possible to obtain light having a wavelength of 10 micrometers.

[0014]

As described above, according to the present invention,
Variable length light can be obtained using an electron beam from an accelerator with a very small structure.

[Brief description of drawings]

FIG. 1 is a sectional view of a light emitting device according to a first embodiment of the present invention.

FIG. 2 is a sectional view of a light emitting device according to a second embodiment of the present invention.

FIG. 3 is a perspective view of a conventional light emitting device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cathode part 2 Anode part 3 Electron beam 4 Electromagnetic field generating part 5 Dielectric resonator part 6 Reflecting mirror 11 Cathode part 12 Anode part 13 Electron beam 14 Electromagnetic field generating part 15 Dielectric resonator part 16 Reflecting mirror

Claims (6)

[Claims] 1. A cathode section for emitting an electron beam, an electromagnetic field generating section for collimating the electron beam emitted from the cathode section, and a dielectric provided in the vicinity of the passage of the collimated electron beam. A light-emitting device characterized by the above. 2. The light emitting device according to claim 1, further comprising an optical resonator having reflecting mirrors provided at both ends of a dielectric material provided near the passage of the electron beam. 3. The light emitting device according to claim 1, wherein the cathode portion has a size of 10 μm or less. 4. A cathode section for emitting an electron beam, an electromagnetic field generating section for collimating the electron beam emitted from the cathode section, and a diffraction grating provided in the vicinity of the passage of the collimated electron beam. A light-emitting device characterized by the above. 5. The light emitting device according to claim 4, further comprising an optical resonator having reflecting mirrors provided at both ends of a dielectric material provided near the passage of the electron beam. 6. The light emitting device according to claim 4, wherein the size of the cathode portion is 10 μm or less.