CN104539371A - Superconducting heterodyne integrated receiver with terahertz quantum-cascade laser as local oscillation source - Google Patents
Superconducting heterodyne integrated receiver with terahertz quantum-cascade laser as local oscillation source Download PDFInfo
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- CN104539371A CN104539371A CN201410749633.2A CN201410749633A CN104539371A CN 104539371 A CN104539371 A CN 104539371A CN 201410749633 A CN201410749633 A CN 201410749633A CN 104539371 A CN104539371 A CN 104539371A
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Abstract
The invention discloses a superconducting heterodyne integrated receiver with a terahertz quantum-cascade laser as a local oscillation source. The superconducting heterodyne integrated receiver comprises the terahertz quantum-cascade laser, a frequency mixer, a first intermediate frequency amplifier, a second intermediate frequency amplifier, a spectrometer, a convex lens and a wave beam splitter. Local oscillation reference signal wave beams output by the terahertz quantum-cascade laser are shaped by the convex lens, then the local oscillation reference signal wave beams and detected signals are coupled to the frequency mixer through the wave beam splitter wave beam splitter, the first intermediate frequency amplifier and the second intermediate frequency amplifier amplify intermediate frequency signals output by the frequency mixer, and the spectrometer analyzes output signals of the second intermediate frequency amplifier. The terahertz quantum-cascade laser, the convex lens, the wave beam splitter, the frequency mixer and the first intermediate frequency amplifier are arranged in a low-temperature vacuum environment which is 4K in temperature and achieved by the same vacuum dewar, any adjustable optical element for coupling the output signals of the terahertz quantum-cascade laser to the superconducting electronic frequency mixer is not needed, the structure is simple and compact, and integration and miniaturization are facilitated.
Description
Technical field
The present invention relates to a kind of superconduction heterodyne integrated receiver, particularly relate to the superconduction heterodyne integrated receiver using Terahertz quantum cascaded laser as local oscillator reference source that one is applicable to Terahertz high band (1.5 ~ 5.0 THz).
Background technology
Terahertz (THz) frequency range is between microwave and far infrared frequency range, and this frequency range is one of important frequency range of modern astronomy.Terahertz frequency range exists enriches molecule rotation spectral line and fine structure atomic spectral line, carries out to these molecules and atomic spectral line chemical property and the kinematics character that high resolution observations can study celestial objects.Terahertz wave band molecule rotation spectral line and fine structure atomic spectral line high resolution observations have very important significance for understanding early universe evolution, fixed star and galaxy formation, planet and planetary system formation etc., in astrophysics and cosmology research, have irreplaceable effect.
Molecule and atomic spectral line high resolution observations realize by relevant detection (heterodyne mixing).Relevant detection can simultaneously detection signal phase and magnitude information, and coherence detector (heterodyne receiver) essential core parts are heterodyne mixer and local oscillator reference source.
Because astronomical signal is very faint, Astronomical application heterodyne mixer is mainly superconduction heterodyne mixer.Superconduction heterodyne mixer, compared with conventional normal temperature heterodyne mixer, more than its highly sensitive magnitude, can reach several times of quantum limits, meet Detection of Weak Signals demand.Terahertz frequency range mainly applies superconduction heterodyne mixer superconducting tunnel junction frequency mixer and heat superconducting electronics frequency mixer.Superconducting tunnel junction frequency mixer operation principle is based on quasi-particle tunnelling effect, and its operating frequency by superconductor energy gap frequency limitation, is mainly used in Terahertz low-frequency range, as lower than 1.5 THz.Heat superconducting electronics frequency mixer belongs to thermal detector, and its operating frequency by superconductor energy gap frequency limitation, can not cover whole Terahertz frequency range, be mainly used in Terahertz high band (1.5 ~ 5.0 THz) at present.
In local oscillator reference source, Terahertz frequency band signals source mainly contains solid-state semiconductor source, infrared-gas laser and Terahertz quantum cascaded laser etc.Solid-state semiconductor source is applied to Terahertz low-frequency range (lower than 1.5 THz) usually, and at 1.5 THz with super band, solid-state semiconductor source sharply reduces by stray reactance effect limits output signal power, is difficult to meet local oscillator reference source application demand.Infrared-gas laser is the most frequently used local oscillator reference source in current laboratory, its power output large (can reach milliwatt up to a hundred), but its output signal power stability is not high and volume is comparatively large, is difficult to be applied to astronomical observation.Terahertz quantum cascaded laser is a kind of local oscillator reference source of new development, Terahertz quantum cascaded laser is in power output in recent years, the various aspects such as output frequency and working temperature all obtain remarkable breakthrough, have become one of important selection of Terahertz high band (1.5 ~ 5.0 THz) local oscillator reference source.
Within 2005,2.8 THz quantum cascade laser are applied in the experiment of heat superconducting electronics mixing receiver as local oscillator reference source by Dutch SRON group first.Under Terahertz quantum cascaded laser and heat superconducting electronics frequency mixer all must operate at low-temperature vacuum environment, in experiment, they utilize two 4 K vacuum dewars to cool Terahertz quantum cascaded laser and heat superconducting electronics frequency mixer respectively, as shown in Figure 1.Two 4 K vacuum dewars make superconduction heterodyne mixing receiver structure become very complicated, consider that in earth atmosphere, steam is serious to the decay of Terahertz high frequency band signal, Terahertz high band molecule or atomic spectral line high resolution observations are generally all based on space or balloon telescope, and labyrinth superconduction heterodyne mixing receiver is difficult to apply in astronomical observation.For this reason, within 2008, German DLR group proposes a kind of superconduction heterodyne integrated receiver, Terahertz quantum cascaded laser and heat superconducting electronics frequency mixer are worked in vacuum dewar 40 K and the cold level of 4 K (namely providing temperature lower than the low temperature environment of 4K) by respectively, but this superconduction heterodyne integrated receiver requires that Terahertz quantum cascaded laser can in comparative high temperature work, need tunable optical component coupling Terahertz quantum cascaded laser to output signal to heat superconducting electronics frequency mixer simultaneously outside vacuum dewar, also bring difficulty to astronomical observation.So, need badly exploitation a kind of simple for structure compact without the need to tunable optical component local oscillator reference source signal is coupled to frequency mixer can Terahertz high band (1.5 ~ 5.0 THz) realize high sensitivity detection and be easy to the superconduction heterodyne receiver of practical application.
Summary of the invention
The object of this invention is to provide and a kind of realize high sensitivity detection, compact conformation and what be easy to practical application take Terahertz quantum cascaded laser as the Terahertz superconduction heterodyne integrated receiver of local vibration source at Terahertz high band (1.5 ~ 5.0 THz).In this integrated receiver, Terahertz quantum cascaded laser and heat superconducting electronics frequency mixer are all integrated in the cold level of same vacuum dewar 4 K.The present invention utilizes simple convex lens to carry out shaping to the local oscillator reference signal wave beam that Terahertz quantum cascaded laser exports, and these convex lens work in the cold level of above-mentioned vacuum dewar 4 K.The local oscillator reference signal wave beam that Terahertz quantum cascaded laser after shaping exports and be detected signal the beam splitter by working at low ambient temperatures is coupled to heat superconducting electronics frequency mixer.Beam splitter low-temperature working can reduce himself thermal noise, and air agitation can be avoided the impact of beam splitter and superconduction heterodyne integrated receiver job stability simultaneously.Without the need to any tunable optical component in this superconduction heterodyne integrated receiver, and vacuum dewar is outer without the need to any optical element, is easy to Integrated predict model in systems in practice.
In order to realize above-mentioned goal of the invention, technical scheme of the present invention is to provide the superconduction heterodyne integrated receiver that a kind of Terahertz quantum cascaded laser is local vibration source, and its designing points is, comprising:
Quantum cascade laser, it exports the local oscillator reference signal wave beam needed for frequency mixer work, and laser direct current biasing and quantum cascade laser electrical connection, for providing direct current biasing to quantum cascade laser;
Frequency mixer, for carrying out upconversion operation to being detected signal, after the shaping of described local oscillator reference signal wave beam planoconvex lens and be detected signal respectively incoming wave beam separator, exported by beam splitter after coupling operation and be input to the input of described frequency mixer, frequency mixer direct current biasing and frequency mixer electrical connection, for providing direct current biasing to frequency mixer;
First intermediate frequency amplifier, for the intermediate-freuqncy signal that amplifiermixer exports, the input of the first intermediate frequency amplifier and the output electrical connection of frequency mixer;
Second intermediate frequency amplifier, for amplifying the intermediate-freuqncy signal that the first intermediate frequency amplifier exports, the input of the second intermediate frequency amplifier and the output electrical connection of the first intermediate frequency amplifier;
Frequency spectrograph, for signal spectral analysis, the input of frequency spectrograph and the output electrical connection of the second intermediate frequency amplifier;
Described quantum cascade laser, convex lens, beam splitter, frequency mixer and the first intermediate frequency amplifier are arranged in same low-temperature vacuum environment.
The present invention in the application, also has the following technical scheme improved further.
Further, the temperature of described low-temperature vacuum environment is 4K, is built by vacuum dewar.
Further, described quantum cascade laser is Terahertz quantum cascaded laser.
Further, described Terahertz quantum cascaded laser is the Bound-to-continuum type Terahertz quantum cascaded laser of low-power consumption.
Further, described frequency mixer is heat superconducting electronics frequency mixer.
Present invention achieves a kind of take Terahertz quantum cascaded laser as the superconduction heterodyne integrated receiver of local oscillator reference source, as compared to conventional superconduction heterodyne receiver (using two Dewars to cool heat superconducting electronics frequency mixer and Terahertz quantum cascaded laser respectively), superconduction heterodyne integrated receiver designed by the present invention only needs a temperature to be the vacuum dewar of 4 K, and it is simple and compact for structure.Without the need to any tunable optical component local oscillator reference signal wave beam that Terahertz quantum cascaded laser exports being coupled to heat superconducting electronics frequency mixer in this superconduction heterodyne integrated receiver system, be easy to integrated in real application systems.Under being also integrated in 4 K low temperature environments for the beam splitter of the Terahertz quantum cascaded laser output reference wave beam that is coupled, himself thermal noise can correspondingly reduce, and then reduces whole superconduction heterodyne receiver noise.Beam splitter also can avoid air agitation and sound wave on the impact of beam splitter and the work of heat superconducting electronics frequency mixer under working in cryogenic vacuum.In addition, compared with conventional superconduction heterodyne receiver (using two vacuum dewars), quantum cascade laser, convex lens, beam splitter, frequency mixer and the first intermediate frequency amplifier are arranged in the low-temperature vacuum environment of same vacuum dewar realization by the present invention, simple and compact for structure, refrigeration machine (as closed circuit refrigeration machine) mechanical oscillation simultaneously also can correspondingly reduce the impact of frequency mixer job stability.
Beneficial effect
It is in the low-temperature vacuum environment of 4K that quantum cascade laser, lenticular device, beam splitter, frequency mixer and the first intermediate frequency amplifier are arranged on the temperature realized by same vacuum dewar by the present invention, without the need to any tunable optical component Terahertz quantum cascaded laser output signal being coupled to heat superconducting electronics frequency mixer, simple and compact for structure, be easy to integration of compact; Refrigeration machine (as closed circuit refrigeration machine) mechanical oscillation simultaneously also can correspondingly reduce the impact of frequency mixer job stability.
Under beam splitter is operated in 4 K low-temperature vacuum environment, the corresponding reduction of himself thermal noise on the one hand, and then reduce whole superconduction heterodyne receiver noise, on the other hand beam splitter work can avoid air agitation and sound wave on the impact of beam splitter and the work of heat superconducting electronics frequency mixer under vacuo.
Accompanying drawing explanation
Fig. 1 tradition Terahertz superconduction heterodyne receiver organigram.
Fig. 2 Terahertz superconduction of the present invention heterodyne receiver organigram.
Embodiment
In order to illustrate technical scheme of the present invention and technical purpose, below in conjunction with the drawings and the specific embodiments, the present invention is described further.
As shown in Figure 2, a kind of Terahertz quantum cascaded laser of the present invention is the superconduction heterodyne integrated receiver of local vibration source, comprises quantum cascade laser, frequency mixer, the first intermediate frequency amplifier, the second intermediate frequency amplifier, frequency spectrograph, convex lens and beam splitter.
Quantum cascade laser is Terahertz quantum cascaded laser, is preferably the Bound-to-continuum type Terahertz quantum cascaded laser of low-power consumption.The output of Terahertz quantum cascaded laser exports the local oscillator reference signal wave beam being used as reference signal needed for frequency mixer work, the feeder ear electrical connection of laser direct current biasing and Terahertz quantum cascaded laser, for providing direct current biasing to Terahertz quantum cascaded laser, it is driven normally to work.Frequency mixer is heat superconducting electronics frequency mixer, for carrying out upconversion operation to being detected signal.Output Shaping wave beam after the local oscillator reference signal wave beam planoconvex lens shaping that described Terahertz quantum cascaded laser exports, shaped beam and be detected signal and be coupled respectively two inputs of incoming wave beam separator, be input to the shaped beam in beam splitter and be detected signal and exported by the output of beam splitter after coupling operation and the input being input to described heat superconducting electronics frequency mixer, signal is detected to Terahertz and carries out upconversion operation, make it become intermediate-freuqncy signal; Frequency mixer direct current biasing and the electrical connection of heat superconducting electronics frequency mixer feeder ear, for providing direct current biasing to heat superconducting electronics frequency mixer, drive it normally to work.First intermediate frequency amplifier, for amplifying the intermediate-freuqncy signal that heat superconducting electronics frequency mixer exports, the input of the first intermediate frequency amplifier and the output electrical connection of heat superconducting electronics frequency mixer.Second intermediate frequency amplifier, for amplifying the intermediate-freuqncy signal of the first output, the input of the second intermediate frequency amplifier and the output electrical connection of the first intermediate frequency amplifier.Frequency spectrograph, for signal spectral analysis, the input of frequency spectrograph and the output electrical connection of the second intermediate frequency amplifier.
In order to reduce the impact of Terahertz quantum cascaded laser heat dissipation on the work of heat superconducting electronics frequency mixer, the Bound-to-continuum type Terahertz quantum cascaded laser of low-power consumption is adopted in the present invention, it has the advantages that parasite current is little and bias current is little, and its typical heat power consumption can be less than 1 watt.Current temperature is that the low temperature environment of 4 K realizes by closed circuit refrigeration machine or liquid helium cooling, and the conventional refrigeration work consumption of closed circuit refrigeration machine when the cold level of 4.2K can reach 1.5 watts, liquid helium cooling power is then larger, the temperature that when this is with regard to meaning that Terahertz quantum cascaded laser normally works, vacuum dewar realizes is that the temperature of the cold level of 4 K can not more than 4.2 K, Terahertz quantum cascaded laser and heat superconducting electronics frequency mixer are integrated in same Cryo Equipment, as in vacuum Dewar bottle, Terahertz quantum cascaded laser heat dissipation can not affect heat superconducting electronics frequency mixer and normally work, this is because, maximum temperature based on the heat superconducting electronics frequency mixer normal table work of NbN film is about 0.8 Tc, Tc is the critical temperature of NbN film, be generally about 9 K, then based on the maximum temperature of the heat superconducting electronics frequency mixer steady operation of NbN film up to 7.2K, much larger than 4.2K, so, above-mentioned Terahertz quantum cascaded laser and heat superconducting electronics frequency mixer can be integrated in same Cryo Equipment.
Wherein, the integrated temperature built by same vacuum dewar (also claiming vacuum Dewar bottle) that is arranged on of described quantum cascade laser, convex lens, beam splitter, frequency mixer and the first intermediate frequency amplifier is in the low-temperature vacuum environment of 4K, as shown in dashed region in Fig. 2, then simple and compact for structure.Described second intermediate frequency amplifier, frequency spectrograph, laser direct current biasing and frequency mixer direct current biasing source are all arranged on normal temperature environment.Without the need to any tunable optical component in this superconduction heterodyne integrated receiver, and vacuum dewar is outer without any optical element, is easy to integrated in real application systems.Under beam splitter is also operated in 4 K low temperature environments, himself thermal noise can correspondingly reduce, and then described superconduction heterodyne receiver noise obtains reduction.Beam splitter also avoid the impact on beam splitter and heat superconducting electronics frequency mixer of air agitation and sound wave under working in cryogenic vacuum.
Of the present invention when Terahertz superconduction heterodyne integrated receiver normally works, Terahertz is detected local oscillator reference signal wave beam that signal and Terahertz quantum cascaded laser export is coupled to heat superconducting electronics frequency mixer input by beam splitter; The intermediate-freuqncy signal after mixing is exported at the output of heat superconducting electronics frequency mixer, after described intermediate-freuqncy signal is successively amplified with the second intermediate frequency amplifier being placed in normal wet environment by the first intermediate frequency amplifier being placed in low-temperature vacuum environment, last import and export is to Spectrometry analysis process.
Cool heat superconducting electronics frequency mixer respectively with use two vacuum dewars to compare with the conventional superconduction heterodyne receiver of Terahertz quantum cascaded laser, superconduction heterodyne integrated receiver designed by the present invention only needs a cold level vacuum dewar of 4 K, without the need to any tunable optical component reference wave beam that Terahertz quantum cascaded laser exports being coupled to heat superconducting electronics frequency mixer in this superconduction heterodyne integrated receiver system, then simple and compact for structure, be easy to integrated in real application systems.Relative to prior art, the present invention has following technological progress.
1) quantum cascade laser, convex lens, beam splitter, frequency mixer and the first intermediate frequency amplifier are arranged on the temperature realized by same vacuum Dewar bottle by the present invention is in the low-temperature vacuum environment of 4K, without the need to any tunable optical component Terahertz quantum cascaded laser output signal being coupled to heat superconducting electronics frequency mixer, simple and compact for structure, be easy to integration of compact; Refrigeration machine (as closed circuit refrigeration machine) mechanical oscillation simultaneously also can correspondingly reduce the impact of frequency mixer job stability.
2) under beam splitter is operated in 4 K low-temperature vacuum environment, the corresponding reduction of himself thermal noise on the one hand, and then reduce whole superconduction heterodyne receiver noise, on the other hand beam splitter work can avoid air agitation and sound wave on the impact of beam splitter and the work of heat superconducting electronics frequency mixer under vacuo.
More than show and describe general principle of the present invention, principal character and advantage of the present invention.The technical staff of the industry should understand; the present invention is not restricted to the described embodiments; what describe in above-described embodiment and specification just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and application claims protection range is defined by appending claims, specification and equivalent thereof.
Claims (5)
1. Terahertz quantum cascaded laser is a superconduction heterodyne integrated receiver for local vibration source, it is characterized in that, comprising:
Quantum cascade laser, it exports the local oscillator reference signal wave beam needed for frequency mixer work, and laser direct current biasing and quantum cascade laser electrical connection, for providing direct current biasing to quantum cascade laser;
Frequency mixer, for carrying out upconversion operation to being detected signal, after the shaping of described local oscillator reference signal wave beam planoconvex lens and be detected signal and be coupled respectively to beam splitter, exported by beam splitter after coupling operation and be input to the input of described frequency mixer, frequency mixer direct current biasing and frequency mixer electrical connection, for providing direct current biasing to frequency mixer;
First intermediate frequency amplifier, for the intermediate-freuqncy signal that amplifiermixer exports, the input of the first intermediate frequency amplifier and the output electrical connection of frequency mixer;
Second intermediate frequency amplifier, for amplifying the intermediate-freuqncy signal that the first intermediate frequency amplifier exports, the input of the second intermediate frequency amplifier and the output electrical connection of the first intermediate frequency amplifier;
Frequency spectrograph, for signal spectral analysis, the input of frequency spectrograph and the output electrical connection of the second intermediate frequency amplifier;
Described quantum cascade laser, convex lens, beam splitter, frequency mixer and the first intermediate frequency amplifier are arranged in same low-temperature vacuum environment.
2. a kind of Terahertz quantum cascaded laser according to claim 1 is the superconduction heterodyne integrated receiver of local vibration source, it is characterized in that: the temperature of described low-temperature vacuum environment is 4K, is built by vacuum dewar.
3. a kind of Terahertz quantum cascaded laser according to claim 1 is the superconduction heterodyne integrated receiver of local vibration source, it is characterized in that: described quantum cascade laser is Terahertz quantum cascaded laser.
4. a kind of Terahertz quantum cascaded laser according to claim 3 is the superconduction heterodyne integrated receiver of local vibration source, it is characterized in that: described Terahertz quantum cascaded laser is the Bound-to-continuum type Terahertz quantum cascaded laser of low-power consumption.
5. a kind of Terahertz quantum cascaded laser according to claim 1 is the superconduction heterodyne integrated receiver of local vibration source, it is characterized in that: described frequency mixer is heat superconducting electronics frequency mixer.
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| CN105510724A (en) * | 2015-11-30 | 2016-04-20 | 中国科学院紫金山天文台 | Magnetic field adjustment and control-based high-stability terahertz super-heat conduction electronic coherent detector system |
| CN107733641A (en) * | 2017-08-29 | 2018-02-23 | 上海循态信息科技有限公司 | The high BREATHABLE BANDWIDTH quantum balancing zero-difference detection device of high speed and its control method |
| CN107860741A (en) * | 2017-09-19 | 2018-03-30 | 中国科学院紫金山天文台 | The integrating device and method of thermoelectron frequency mixer and Terahertz quantum cascaded laser |
| CN107911177A (en) * | 2017-12-21 | 2018-04-13 | 四川众为创通科技有限公司 | Terahertz minimizes multifunctional unit receiver front end |
| CN109039353A (en) * | 2018-05-24 | 2018-12-18 | 南京大学 | A kind of superconduction heterodyne integrated receiver |
| CN109283537A (en) * | 2017-07-23 | 2019-01-29 | 北京遥感设备研究所 | A kind of quasi-optical heterodyne Terahertz target scattering characteristics bistatic measurement system |
| CN109991497A (en) * | 2019-04-11 | 2019-07-09 | 中国科学院新疆天文台 | A kind of dualbeam coolant receiver calibration method |
| CN110132884A (en) * | 2019-04-28 | 2019-08-16 | 中国科学院上海微系统与信息技术研究所 | The method of the tera-hertz spectra of terahertz light spectral measurement system and analysis substance |
| CN110763333A (en) * | 2019-11-05 | 2020-02-07 | 中国科学院紫金山天文台 | Ultra-wideband quasi-optical 2 x 2 pixel superconducting thermal electronic mixer array receiver |
| CN110808788A (en) * | 2019-11-05 | 2020-02-18 | 中国科学院紫金山天文台 | Novel high-integration superconductive thermionic heterodyne receiver |
| CN113078956A (en) * | 2021-03-10 | 2021-07-06 | 中国科学院紫金山天文台 | Terahertz multiband coherent receiving system based on phase grating |
| CN113608175A (en) * | 2021-08-03 | 2021-11-05 | 上海无线电设备研究所 | RCS measurement transceiving system based on quantum cascade |
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| CN105510724A (en) * | 2015-11-30 | 2016-04-20 | 中国科学院紫金山天文台 | Magnetic field adjustment and control-based high-stability terahertz super-heat conduction electronic coherent detector system |
| CN109283537A (en) * | 2017-07-23 | 2019-01-29 | 北京遥感设备研究所 | A kind of quasi-optical heterodyne Terahertz target scattering characteristics bistatic measurement system |
| CN107733641B (en) * | 2017-08-29 | 2020-12-22 | 上海循态信息科技有限公司 | High-speed high-adjustable-bandwidth quantum balance homodyne detector and control method thereof |
| CN107733641A (en) * | 2017-08-29 | 2018-02-23 | 上海循态信息科技有限公司 | The high BREATHABLE BANDWIDTH quantum balancing zero-difference detection device of high speed and its control method |
| CN107860741A (en) * | 2017-09-19 | 2018-03-30 | 中国科学院紫金山天文台 | The integrating device and method of thermoelectron frequency mixer and Terahertz quantum cascaded laser |
| CN107911177A (en) * | 2017-12-21 | 2018-04-13 | 四川众为创通科技有限公司 | Terahertz minimizes multifunctional unit receiver front end |
| CN109039353A (en) * | 2018-05-24 | 2018-12-18 | 南京大学 | A kind of superconduction heterodyne integrated receiver |
| CN109991497A (en) * | 2019-04-11 | 2019-07-09 | 中国科学院新疆天文台 | A kind of dualbeam coolant receiver calibration method |
| CN110132884A (en) * | 2019-04-28 | 2019-08-16 | 中国科学院上海微系统与信息技术研究所 | The method of the tera-hertz spectra of terahertz light spectral measurement system and analysis substance |
| CN110132884B (en) * | 2019-04-28 | 2021-08-06 | 中国科学院上海微系统与信息技术研究所 | Terahertz spectrum measuring system and method for analyzing terahertz spectrum of substance |
| CN110763333A (en) * | 2019-11-05 | 2020-02-07 | 中国科学院紫金山天文台 | Ultra-wideband quasi-optical 2 x 2 pixel superconducting thermal electronic mixer array receiver |
| CN110808788B (en) * | 2019-11-05 | 2021-03-16 | 中国科学院紫金山天文台 | Novel high-integration superconductive thermionic heterodyne receiver |
| CN110808788A (en) * | 2019-11-05 | 2020-02-18 | 中国科学院紫金山天文台 | Novel high-integration superconductive thermionic heterodyne receiver |
| CN113078956A (en) * | 2021-03-10 | 2021-07-06 | 中国科学院紫金山天文台 | Terahertz multiband coherent receiving system based on phase grating |
| CN113078956B (en) * | 2021-03-10 | 2022-08-02 | 中国科学院紫金山天文台 | Terahertz multiband coherent receiving system based on phase grating |
| CN113608175A (en) * | 2021-08-03 | 2021-11-05 | 上海无线电设备研究所 | RCS measurement transceiving system based on quantum cascade |
| CN113608175B (en) * | 2021-08-03 | 2023-09-19 | 上海无线电设备研究所 | RCS measurement receiving and transmitting system based on quantum cascade |
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