Terahertz quantum cascade laser system and gas identification system and method

A quantum cascade and terahertz technology, which is applied to devices, instruments, and measuring devices that control laser output parameters, can solve the problem of inability to quickly and accurately detect the characteristic spectrum of the gas sample to be measured, and the spectral range of the terahertz quantum cascade laser. Narrow problems, to achieve rapid and accurate gas identification, broaden the spectral range, and broaden the frequency coverage

Inactive Publication Date: 2018-05-11
SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the above-mentioned shortcomings of the prior art, the object of the present invention is to provide a terahertz quantum cascade laser system, gas identification system and method, which are used to solve the problem of the narrow spectral range of the terahertz quantum cascade laser in the prior art. , unable to quickly and accurately detect the characteristic spectrum of the measured gas sample

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  • Terahertz quantum cascade laser system and gas identification system and method
  • Terahertz quantum cascade laser system and gas identification system and method
  • Terahertz quantum cascade laser system and gas identification system and method

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Embodiment 1

[0064] Such as figure 1 As shown, this embodiment provides a terahertz quantum cascade laser system, and the terahertz quantum cascade laser system includes:

[0065] A DC source 11, configured to supply power to the terahertz quantum cascade laser system;

[0066] The T-type bias device 12 connected to the DC source 11 is used to bias the signal provided by the DC source 11 when the RF source 15 is turned off, and provide the bias signal to the terahertz quantum cascade laser 16, And couple the beat frequency signal of the terahertz quantum cascade laser 16 and lead the beat frequency signal to the circulator 13; when the radio frequency source 15 is turned on, it is used to bias the signal provided by the DC source 11, and the bias signal After being superimposed with the radio frequency signal, it is input to the terahertz quantum cascade laser 16;

[0067] A circulator 13 connected to one end of the T-shaped biaser 12 for isolating radio frequency signals and beat freque...

Embodiment 2

[0081] Such as figure 2 As shown, this embodiment provides a method for generating a wide spectrum by using the terahertz quantum cascade laser system described in Embodiment 1, the method comprising:

[0082] S11: the radio frequency source 15 is turned off, and the DC source 11 loads a bias signal to the terahertz quantum cascade laser 16 through the T-shaped biaser 12;

[0083] S12: When the bias signal exceeds the threshold of the terahertz quantum cascade laser 16, the terahertz quantum cascade laser 16 undergoes multi-longitudinal mode lasing to generate a beat frequency signal;

[0084] S13: The T-type biaser 12 couples the beat frequency signal and leads the beat frequency signal to the circulator 13, and transmits the beat frequency signal to the frequency detection device 14 through the circulator 13;

[0085] S14: Measure the frequency of the beat signal through the frequency detection device 14;

[0086] S15: Turn on the radio frequency source 15, set the radio ...

Embodiment 3

[0098] Such as Figure 4 As shown, this embodiment provides a gas identification system, the gas identification system includes:

[0099] The terahertz quantum cascade laser system described in Embodiment 1; and

[0100] A spectrometer 18 used in conjunction with the terahertz quantum cascade laser system.

[0101] Preferably, in this embodiment, the spectrometer 18 is a far-infrared Fourier spectrometer; the far-infrared Fourier spectrometer has the characteristics of high signal-to-noise ratio, fast scanning speed, and good reproducibility.

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Abstract

The invention provides a terahertz quantum cascade laser system, which comprises a DC source, a T-type polarization device connected with the DC source, a circulator connected with one end of the T-type polarization device, a frequency detection device connected with one end of the circulator, a radio frequency source connected with the other end of the circulator and a laser connected with the other end of the T-type polarization device, wherein the T-type polarization device is used for providing a polarization signal to the laser, coupling a beat frequency signal of the laser, leading the beat frequency signal to the circulator, or superimposing the polarization signal and the radio frequency signal and inputting the superimposed signals to the laser; the circulator is used for isolating the radio frequency signal and the beat frequency signal; the frequency detection device is used for detecting the frequency of the beat frequency signal; the radio frequency source is used for providing a radio frequency signal with the frequency being the same as that of the beat frequency signal; and the laser is used for generating the beat frequency signal and wide-spectrum terahertz waves.The terahertz quantum cascade laser system and the gas identification system and method of the invention solve a problem that the terahertz quantum cascade laser in the prior art is narrow in spectrum range and cannot detect the characteristic spectrum of a detected gas sample quickly and accurately.

Description

technical field [0001] The invention belongs to the technical field of application of semiconductor optoelectronic devices, and in particular relates to a terahertz quantum cascade laser system, a gas identification system and a method. Background technique [0002] Terahertz (THz) waves refer to electromagnetic waves with frequencies ranging from 100GHz to 10THz and corresponding wavelengths ranging from 3mm to 3um, between millimeter waves and infrared light; from a physical point of view, THz waves are in the transition from electronics to photonics From the perspective of frequency domain, THz wave covers the characteristic energy of semiconductors and plasmas, the rotation and vibration energy of organic and biological macromolecules, and about 50% of the photon energy in the universe; from the perspective of application, the THz wave Wide frequency band, high measurement signal-to-noise ratio, high spatial and temporal resolution imaging and signal processing suitable ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S5/06H01S5/10G01N21/3586G01N21/3504
CPCH01S5/06G01N21/3504G01N21/3586H01S5/10
Inventor 黎华万文坚曹俊诚
Owner SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
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