Quantum cascade laser-based full-optical and pure-frequency modulation system
A quantum cascade and frequency modulation technology, which is applied to lasers, devices for controlling laser output parameters, phonon exciters, etc., can solve the limitation of modulation speed, red shift of output wavelength of quantum cascade lasers, and reduce the amount of laser frequency variation, etc. problem, to achieve the effect of increasing the modulation speed, solving the red shift of the output wavelength, and reducing the amount of laser frequency variation
A quantum cascade and frequency modulation technology, which is applied to lasers, devices for controlling laser output parameters, phonon exciters, etc., can solve the limitation of modulation speed, red shift of output wavelength of quantum cascade lasers, and reduce the amount of laser frequency variation, etc. problem, to achieve the effect of increasing the modulation speed, solving the red shift of the output wavelength, and reducing the amount of laser frequency variation
CN106936070AActive Publication Date: 2017-07-07INST OF FLUID PHYSICS CHINA ACAD OF ENG PHYSICS
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[0036] Such as figure 1 As shown, the present invention is an all-optical pure frequency modulation system based on a quantum cascade laser, including a quantum cascade laser 1, a frequency modulation light source 2, an amplitude modulation suppression light source 3, a high-precision current source 4, a constant temperature control device 5, and multiple Road synchronous output semiconductor laser driver 6, first beam collimator 7, first beam focuser 8, second beam collimator 9, second beam focuser 10, beam collimator 11, beam splitter 12, Fu Ripple infrared spectrometer 13, beam focuser 14, high-frequency infrared detector 15, high-precision oscilloscope 16, computer 17, wherein: such as figure 2 As shown, the quantum cascade laser 1 is fixed on the metal heat sink, and the frequency modulated visible light or near-infrared laser beam and the amplitude modulation suppressed visible light or near-infrared laser beam are converged on the exit end face of the quantum cascade l...
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The invention discloses a quantum cascade laser-based full-optical and pure-frequency modulation system. The system comprises a quantum cascade laser, a high-precision current source, a constant-temperature control device, a double-light-beam modulation system, a light beam collimator, a beam splitter, a Fourier infrared spectrometer, a beam focusing device, a high-frequency infrared detector and a high-precision oscilloscope. According to the technical scheme of the invention, a frequency-modulated light source is adopted to irradiate the emergent end surface of the quantum cascade laser, so that the high-speed amplitude and frequency modulation is realized, wherein the amplitude modulation is positive modulation. An amplitude-modulated inhibited light source is adopted to irradiate the emergent end surface of the quantum cascade laser, so that the high-speed amplitude and frequency modulation is realized, wherein the amplitude modulation is negative modulation. Based on the synchronization of the frequency-modulated light source and the amplitude-modulated inhibited light source, the sync suppression of the amplitude modulation and the pure frequency modulation are realized.
Description
technical field [0001] The invention relates to the fields of free space infrared optical communication technology and infrared laser spectrum technology, in particular to an all-optical pure frequency modulation system based on quantum cascade lasers. Background technique [0002] In the prior art, as a widely used infrared coherent light source, the quantum cascade laser has the advantages of narrow line width, high power, and can work at room temperature. Due to the low transmission loss of the mid-infrared laser in the atmosphere, it has the application advantage of free space optical communication; since the mid-infrared band covers the fingerprint spectral region of most gas molecules, it has great potential for trace gas detection. Advantage. Frequency modulation technology can increase the transmission bandwidth of quantum cascade lasers and the signal-to-noise ratio of spectral signals, but frequency modulation must be accompanied by amplitude modulation, which aff...
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Patent Timeline
07 Jul 2017
Publication
CN106936070A
- IPC
- H01S5/042; H01S5/024; H01S5/06
- CPC
- H01S5/024; H01S5/042; H01S5/0608
- Inventors
- 彭琛; 李泽仁