CN113488831B - Terahertz gas laser of electron beam pumping - Google Patents
Terahertz gas laser of electron beam pumping Download PDFInfo
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- CN113488831B CN113488831B CN202110779998.XA CN202110779998A CN113488831B CN 113488831 B CN113488831 B CN 113488831B CN 202110779998 A CN202110779998 A CN 202110779998A CN 113488831 B CN113488831 B CN 113488831B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S1/00—Masers, i.e. devices using stimulated emission of electromagnetic radiation in the microwave range
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/02—Constructional details
- H01S3/03—Constructional details of gas laser discharge tubes
Abstract
The invention discloses a terahertz gas laser of an electron beam pump, which comprises an electron gun, a first vacuum pumping system, a terahertz detector, an off-axis parabolic mirror, a coupling hole, a collector, a second vacuum pumping system, a gas storage warehouse, a pressure sensor, a gas chamber, a vacuum chamber and a resonant cavity. The invention provides a novel method for generating terahertz radiation by utilizing an electronics technology, namely an electron beam pumped terahertz gas laser, which is not only an extension of a terahertz waveband of a gas pumped laser, but also a novel innovation direction of the electron beam terahertz radiation technology.
Description
Technical Field
The invention belongs to the technical field of terahertz radiation sources, and particularly relates to a terahertz gas laser of an electron beam pump.
Background
Conventional e-beam laser research is divided into several categories, first: in the last century, a large number of gas lasers of electron beam pumping are developed, and high-energy electron beams are utilized to carry out ultraviolet light frequency bands of 170nm-180nm on inert gas frequency bands such as Xe, Kr, Ar and the like; secondly, researching an electron beam pumping KrF laser; thirdly, research work of generating far infrared laser by a low-energy electron beam pump XeI is carried out, an electron beam of 5-20KeV is injected into the gas chamber through a small hole and interacts with gas to generate infrared radiation of 1.73 micrometers. However, most of the electron beam lasers designed by the conventional electron beam laser research are pumping visible light waves (which extend to the ultraviolet and infrared bands at most), and terahertz waves lower than the infrared band in the spectrum are not used as electron beam gas pumping laser sources, so that the band range of the electron beam pumping lasers is greatly limited.
Disclosure of Invention
The invention aims to solve the problem of the wave band range of an electron beam pumping laser and provides an electron beam pumping terahertz gas laser.
The technical scheme of the invention is as follows: an electron beam with certain energy is bombarded on gas molecules with a rotational vibration energy level in a terahertz waveband to excite terahertz radiation. The terahertz gas laser of the electron beam pumping comprises an electron gun, a first vacuum pumping system, a terahertz detector, an off-axis parabolic mirror, a coupling hole, a collector, a second vacuum pumping system, a gas storage warehouse, a pressure sensor, a gas chamber, a vacuum chamber and a resonant chamber;
the electron gun is fixedly arranged at one end of the vacuum cavity; the first vacuum pumping system and the terahertz detector are both fixedly arranged at the lower end of the vacuum cavity; the off-axis parabolic mirror is fixedly arranged inside the vacuum cavity; the other end of the vacuum cavity is fixedly connected with one end of the resonance cavity through the coupling hole; the collector is fixedly arranged at the other end of the resonant cavity; the second vacuum pumping system is fixedly arranged above the resonant cavity; the second vacuum pumping system is sequentially and fixedly connected with the gas storage tank, the pressure sensor and the gas chamber.
Further, the resonant cavity comprises a reflector, a gas chamber and an electron beam channel;
the reflectors are fixedly arranged on the inner walls of the two sides of the gas chamber; the electron beam channel is fixedly arranged in the resonant cavity.
Further, the gas chamber contains gas molecules having rotational vibration energy level in the THz band.
Further, the electron gun is used for generating an electron beam and transmitting the electron beam into the resonant cavity through the vacuum cavity;
the resonant cavity is used for generating vibration transition of gas molecules to generate terahertz waves, and the terahertz waves are oscillated and amplified in the resonant cavity;
the coupling hole is used for radiating the terahertz waves after oscillation amplification, emitting the terahertz waves through the off-axis parabolic mirror and transversely outputting the terahertz waves to the outside of the vacuum cavity;
the first vacuum pumping system is used for providing a vacuum environment for the operation of the electron gun;
the terahertz detector is used for detecting whether terahertz waves are generated or not;
the collector is used for collecting the electron beam after the collision action of the electron beam and the gas molecules in the resonant cavity;
the second vacuum pumping system is used for controlling the vacuum degree of the gas chamber and inputting gas molecules;
the gas storage reservoir is used for storing gas molecules and conveying the gas molecules to the gas chamber by utilizing the second vacuum pumping system;
the gas chamber is used for generating the interaction of the electron beam and gas molecules;
the pressure sensor is used for controlling and adjusting the pressure of the air chamber.
The invention has the beneficial effects that:
(1) the invention provides a novel method for generating terahertz radiation by utilizing an electronics technology, namely an electron beam pumped terahertz gas laser, which is not only an extension of a terahertz waveband of a gas pumped laser, but also a novel innovation direction of the electron beam terahertz radiation technology.
(2) Compared with a terahertz source of vacuum electronics, the terahertz source of the electron beam pumping gas molecules does not need an ultra-high precision processing technology and a cathode material with high emission density as a support, and does not need an ultra-strong magnetic field to maintain system operation, so that the requirement on vacuum is greatly reduced.
(3) Compared with a solid semiconductor terahertz source, the terahertz source of the electron beam pumping gas molecules does not need a precise and complex micro-processing technology to manufacture, so that the cost and the difficulty are greatly saved, and meanwhile, the output power is higher than that of the solid semiconductor source.
(4) Compared with an optical terahertz source, the terahertz source for pumping gas molecules by the electron beam has the advantages of small input power, low cost and relatively small volume of the whole system. And bombarding the gas by using electron beams to generate energy level transition and generate terahertz radiation. Terahertz radiation is detected by the mirror using the connection of the plurality of chambers. And bombarding gas by using electron beams to generate energy level transition, generating terahertz radiation and carrying out resonance amplification in the resonant cavity.
Drawings
FIG. 1 is a structural diagram of a terahertz gas laser;
FIG. 2 is a block diagram of a resonant cavity;
in the figure, 1, an electron gun; 2. a first vacuum pumping system; 3. a terahertz detector; 4. an off-axis parabolic mirror; 5. a coupling hole; 6. a collector; 7. a second vacuum pumping system; 8. a gas reservoir; 9. a pressure sensor; 10. an air chamber; 11. a vacuum chamber; 12. a resonant cavity; 12-1, a reflector; 12-2, a gas chamber; 12-3, electron beam channel.
Detailed Description
The embodiments of the present invention will be further described with reference to the accompanying drawings.
As shown in fig. 1, the present invention provides an electron beam pumped terahertz gas laser, which includes an electron gun 1, a first vacuum pumping system 2, a terahertz detector 3, an off-axis parabolic mirror 4, a coupling hole 5, a collector 6, a second vacuum pumping system 7, a gas storage reservoir 8, a pressure sensor 9, a gas chamber 10, a vacuum chamber 11, and a resonant chamber 12;
the electron gun 1 is fixedly arranged at one end of the vacuum chamber 11; the first vacuum pumping system 2 and the terahertz detector 3 are both fixedly arranged at the lower end of the vacuum cavity 11; the off-axis parabolic mirror 4 is fixedly arranged inside the vacuum cavity 1; the other end of the vacuum cavity 11 is fixedly connected with one end of the resonant cavity 12 through the coupling hole 5; the collector 6 is fixedly arranged at the other end of the resonant cavity 12; the second vacuum pumping system 7 is fixedly arranged above the resonant cavity 12; the second vacuum pumping system 7 is fixedly connected with a gas storage tank 8, a pressure sensor 9 and a gas chamber 10 in sequence.
In the embodiment of the present invention, as shown in FIG. 2, the resonant cavity 12 includes a mirror 12-1, a gas chamber 12-2, and an electron beam passage 12-3;
the reflector 12-1 is fixedly arranged on the inner walls of the two sides of the gas chamber 12-2; the electron beam passage 12-3 is fixedly disposed inside the resonant cavity 12.
In the embodiment of the present invention, as shown in fig. 2, the gas cell 12-2 contains gas molecules having a rotational vibration energy level in the THz band.
In the embodiment of the present invention, the electron gun 1 is used for generating an electron beam and injecting the electron beam into the resonant cavity 12 through the vacuum chamber 11;
the resonant cavity 12 is used for generating vibration transition of gas molecules, generating terahertz waves and amplifying the terahertz waves in the resonant cavity 12 in a vibration mode;
the coupling hole 5 is used for radiating the terahertz waves after oscillation amplification, emitting the terahertz waves through the off-axis parabolic mirror 4 and transversely outputting the terahertz waves to the outside of the vacuum cavity 11;
the first vacuum pumping system 2 is used for providing a vacuum environment for the operation of the electron gun 1; generally, materials for emitting electron beams in an electron gun require a vacuum environment;
the terahertz detector 3 is used for detecting whether terahertz waves are generated or not;
the collector 6 is used for collecting electron beams after collision action of the electron beams and gas molecules in the resonant cavity 12; the collector is used for collecting electron beams, and the electron beams have a large amount of energy after collision and interaction with gas molecules and continue to move with high kinetic energy, so that a collecting device is required for collection;
the second vacuum pumping system 7 is used for controlling the vacuum degree of the gas chamber 12-2 and inputting gas molecules; the second vacuum system is used for controlling the vacuum degree of the gas chamber and inputting gas molecules, and under the working state, the electron beam and the gas molecules act, the pressure needs to be controlled within a certain range, and gas is continuously input;
the gas storage tank 8 is used for storing gas molecules and conveying the gas molecules to the gas chamber 12-2 by using the second vacuum pumping system 7; the gas storage tank is a space for storing gas, and gas molecules are conveyed to the gas chamber under the action of the valve and the second vacuum system;
the gas cell 10 is used for generating the interaction of electron beams and gas molecules;
the pressure sensor 9 is used for controlling and regulating the pressure of the air chamber 10.
After an electron beam generated by the electron gun passes through the vacuum chamber, the electron beam enters the gas chamber with certain concentration, gas molecules generate rotation-vibration transition to generate terahertz waves, the terahertz waves are oscillated and amplified in the resonant cavity and radiate the terahertz waves through the coupling hole, and the terahertz waves are reflected by the off-axis paraboloidal mirror and transversely output to the outside of the vacuum chamber.
The working principle and the process of the invention are as follows: the invention provides a terahertz gas laser which utilizes an electron beam to excite gas molecules to rotate and vibrate energy level so as to generate terahertz radiation, wherein the electron beam is generated by an electron gun and enters a gas cavity to interact with the gas molecules after being transmitted. Each independent structure is welded to ensure air tightness, and every two adjacent elements are connected by a vacuum flange to ensure air tightness. After passing through a vacuum chamber 11, an electron beam generated by an electron gun is incident into a resonant cavity 12 with gas with a certain concentration, gas molecules generate rotation-vibration transition to generate terahertz waves, the terahertz waves are oscillated and amplified in the resonant cavity and radiate the terahertz waves through a coupling hole 5, and the terahertz waves are reflected by an off-axis parabolic mirror 4 and transversely output to the outside of the vacuum chamber.
The invention has the beneficial effects that:
(1) the invention provides a novel method for generating terahertz radiation by utilizing an electronics technology, namely an electron beam pumped terahertz gas laser, which is not only an extension of a terahertz waveband of a gas pumped laser, but also a novel innovation direction of the electron beam terahertz radiation technology.
(2) Compared with a terahertz source of vacuum electronics, the terahertz source of the electron beam pumping gas molecules does not need an ultra-high precision processing technology and a cathode material with high emission density as a support, and does not need an ultra-strong magnetic field to maintain system operation, so that the requirement on vacuum is greatly reduced.
(3) Compared with a solid semiconductor terahertz source, the terahertz source of the electron beam pumping gas molecules does not need a precise and complex micro-processing technology to manufacture, so that the cost and the difficulty are greatly saved, and meanwhile, the output power is higher than that of the solid semiconductor source.
(4) Compared with an optical terahertz source, the terahertz source for pumping gas molecules by the electron beam has the advantages of small input power, low cost and relatively small volume of the whole system. And bombarding the gas by using electron beams to generate energy level transition and generate terahertz radiation. Terahertz radiation is detected by the mirror using the connection of the plurality of chambers. And bombarding the gas by using an electron beam to generate energy level transition, generating terahertz radiation and carrying out resonance amplification in the resonant cavity.
It will be appreciated by those of ordinary skill in the art that the embodiments described herein are intended to assist the reader in understanding the principles of the invention and are to be construed as being without limitation to such specifically recited embodiments and examples. Those skilled in the art can make various other specific changes and combinations based on the teachings of the present invention without departing from the spirit of the invention, and these changes and combinations are within the scope of the invention.
Claims (2)
1. An electron beam pumped terahertz gas laser is characterized by comprising an electron gun (1), a first vacuum pumping system (2), a terahertz detector (3), an off-axis parabolic mirror (4), a coupling hole (5), a collector (6), a second vacuum pumping system (7), a gas storage tank (8), a pressure sensor (9), an air chamber (10), a vacuum chamber (11) and a resonant chamber (12);
the electron gun (1) is fixedly arranged at one end of the vacuum cavity (11); the first vacuum pumping system (2) and the terahertz detector (3) are both fixedly arranged at the lower end of the vacuum cavity (11); the off-axis parabolic mirror (4) is fixedly arranged inside the vacuum cavity (1); the other end of the vacuum cavity (11) is fixedly connected with one end of the resonant cavity (12) through the coupling hole (5); the collector (6) is fixedly arranged at the other end of the resonant cavity (12); the second vacuum pumping system (7) is fixedly arranged above the resonant cavity (12); the second vacuum pumping system (7) is fixedly connected with the gas storage tank (8), the pressure sensor (9) and the gas chamber (10) in sequence;
the resonant cavity (12) comprises a reflector (12-1), a gas chamber (12-2) and an electron beam channel (12-3); the reflectors (12-1) are fixedly arranged on the inner walls of the two sides of the gas chamber (12-2); the electron beam channel (12-3) is fixedly arranged inside the resonant cavity (12); the gas chamber (12-2) contains gas molecules with rotational vibration energy level in THz wave band.
2. The electron beam pumped terahertz gas laser according to claim 1, wherein the electron gun (1) is configured to generate an electron beam and to inject the electron beam into the resonant cavity (12) via the vacuum chamber (11);
the resonant cavity (12) is used for generating vibration transition of gas molecules, generating terahertz waves and amplifying the terahertz waves in the resonant cavity (12) in an oscillating mode;
the coupling hole (5) is used for radiating the terahertz waves after oscillation amplification, transmitting the terahertz waves through the off-axis parabolic mirror (4) and transversely outputting the terahertz waves to the outside of the vacuum cavity (11);
the first vacuum air exhaust system (2) is used for providing a vacuum environment for the operation of the electron gun (1);
the terahertz detector (3) is used for detecting whether terahertz waves are generated or not;
the collector (6) is used for collecting electron beams after collision action of the electron beams and gas molecules in the resonant cavity (12);
the second vacuum pumping system (7) is used for controlling the vacuum degree of the gas chamber (12-2) and inputting gas molecules;
the gas storage reservoir (8) is used for storing gas molecules and conveying the gas molecules to the gas chamber (12-2) by using a second vacuum pumping system (7);
the gas chamber (10) is used for generating the interaction of electron beams and gas molecules;
the pressure sensor (9) is used for controlling and adjusting the pressure of the air chamber (10).
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| US7230244B2 (en) * | 2003-05-16 | 2007-06-12 | Sarnoff Corporation | Method and apparatus for the detection of terahertz radiation absorption |
| CN102403180A (en) * | 2010-09-08 | 2012-04-04 | 中国科学院电子学研究所 | Distribution terahertz oscillator |
| CN104103476B (en) * | 2014-07-22 | 2016-06-08 | 北京大学 | A kind of terahertz light origin system based on micro-coiled carbon fibers |
| CN204256336U (en) * | 2014-12-10 | 2015-04-08 | 天津大学 | Self frequency-changing's tera-hertz parametric oscillator |
| CN105655851B (en) * | 2015-12-29 | 2019-01-22 | 中国科学技术大学 | Terahertz emission source based on non-relativistic charged particle beam exciting media waveguide |
| CN106950191B (en) * | 2017-02-28 | 2019-11-05 | 电子科技大学 | Mating test sample generates the experimental system of spectral characteristic under electronics note excitation |
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| CN109545638B (en) * | 2018-11-20 | 2021-01-05 | 西北核技术研究所 | Terahertz extension interaction oscillator with resonant cavity and cross structure |
| CN109904714A (en) * | 2019-04-28 | 2019-06-18 | 天津市智慧物联信息技术研究院 | A kind of device and method generating high repetition frequency THz wave |
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| CN112952532B (en) * | 2021-01-27 | 2022-11-22 | 电子科技大学 | Terahertz radiation generation method based on interaction of multi-electron beam and plasma |
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