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Multi-longitudinal-mode high-spectral-resolution lidar based on interference spectrum frequency detector

A technology of interferometric spectroscopy and lidar, applied in the field of multi-longitudinal-mode high-spectral resolution lidar, can solve problems such as expensive seeds, poor environmental adaptability, and bulky laser systems

Inactive Publication Date: 2016-10-12
ZHEJIANG UNIV
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Problems solved by technology

[0004] However, in order to achieve the ideal single longitudinal mode laser output, most of the expensive seed injection locking technology is currently used
Such a laser system is not only bulky, but also requires precise control of parameters such as the cavity length of the resonator and pulse establishment time, and poor environmental adaptability, which is extremely unfavorable for the airborne and shipborne HSRL instruments

Method used

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  • Multi-longitudinal-mode high-spectral-resolution lidar based on interference spectrum frequency detector

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Embodiment

[0041] figure 1 Among them, the multi-longitudinal-mode laser 1 can be a laser whose longitudinal-mode spacing and longitudinal-mode width meet the requirements. The longitudinal mode spacing should be determined according to the working wavelength of the HSRL system to be established, and generally should be in the same order of magnitude as the spectral width of the molecular Rayleigh scattering spectrum of the corresponding band. 3GHz is recommended for the band, and 4GHz is recommended for the 355nm band. The longitudinal mode width is preferably less than 150 MHz. For example, Changchun New Industry Company FL-X-P series multi-longitudinal mode fiber lasers can be selected.

[0042] The first deflection mirror 2 and the second deflection mirror 7 can be ordinary anti-strong laser reflectors, such as GCC-101043 of Beijing Daheng Company, with a diameter of 38.1mm;

[0043] The laser beam expander 3 can be an ordinary beam expander, such as the GCO-141602 beam expander o...

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Abstract

The invention discloses a multi-longitudinal-mode high-spectral-resolution lidar based on an interference spectrum frequency detector. Different from the work condition that a single-longitudinal-mode laser device has to be adopted in a traditional HSRL system, the HSRL can work under the condition that a multi-longitudinal-mode laser device serves as an emitting light source. The characteristic that spectrum frequency discriminating curve of the interference spectrum frequency detector is periodical is ingeniously used, the interference spectrum frequency detector has the same inhibition effect at frequency centers of all longitudinal modes as long as designing the period of the frequency discriminating curve to be matched with longitudinal modes of the laser device at intervals, and accordingly the spectrum separation aim the same as that of single-longitudinal-mode work is achieved. The multi-longitudinal-mode HSRL can remarkably reduce dependency of the HSRL on the single-longitudinal-mode laser device, can also reduce cost, size and weight of the laser device, greatly improves stability of a whole system, and plays a very important role in development of airborne and satellite-borne HSRL loads in China.

Description

technical field [0001] The invention belongs to the technical field of atmospheric aerosol remote sensing laser radar, in particular to a multi-longitudinal mode high spectral resolution laser radar based on an interference spectrum discriminator. Background technique [0002] High spectral resolution lidar (HSRL) is an important tool for precise remote sensing of atmospheric aerosols. The usual HSRL emits a high-energy laser pulse with an extremely narrow band spectrum to the remotely sensed atmosphere, and uses a spectral discriminator with high spectral resolution to separate the aerosol-meter scattering component and the atmospheric molecule Rayleigh scattering component in the atmospheric echo signal, so that Important optical parameters such as atmospheric aerosol backscattering coefficient and extinction coefficient can be retrieved without making assumptions about the atmospheric lidar ratio. The current HSRL systems all need to use a single longitudinal mode laser ...

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Application Information

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IPC IPC(8): G01S17/95
CPCG01S17/95Y02A90/10
Inventor 刘东杨甬英成中涛刘崇白剑
Owner ZHEJIANG UNIV
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