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828nm atmospheric water vapor detection differential absorption lidar transmitter system

A differential absorption and lidar technology, applied in radio wave measurement systems, lasers, phonon exciters, etc., can solve problems such as increased inversion errors and spectral line broadening

Pending Publication Date: 2019-08-06
SHANGHAI INST OF TECHNICAL PHYSICS - CHINESE ACAD OF SCI
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Problems solved by technology

The Ti:Sapphire laser transmitter adopts seed injection and resonant cavity active frequency stabilization technology. The spectral performance of the transmitter is relatively stable. The wavelength is generally close to the wavelength of 815-820nm with higher Ti:Sapphire gain; the alexandrite laser generally works in the water vapor of 720-730nm Absorption region, but in the 720-730nm band, the spectral line broadening caused by the backscattering of atmospheric molecules is serious, and the inversion error increases

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  • 828nm atmospheric water vapor detection differential absorption lidar transmitter system
  • 828nm atmospheric water vapor detection differential absorption lidar transmitter system
  • 828nm atmospheric water vapor detection differential absorption lidar transmitter system

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Embodiment Construction

[0019] 1. The laser radar transmitter system uses the double frequency 532nm laser pulse of the seed injected Nd:YAG laser as the pump source, such as the French Quantel company YG980 series product collocation 1064nm continuous wave seed laser (SI-2000), the U.S. Continuum Company Powerlite TM Series with 1064nm continuous wave seed laser (SI-2000), German InnoLas Laser GmbH company SpitLight series with 1064nm continuous wave seed laser, American Spectra-Physics company Quanta-Ray series with 1064nm continuous wave seed laser (Model 6350), and Chinese radium Bao Optoelectronics Technology Co., Ltd. single longitudinal mode Nd:YAG laser; the seed source of 1064nm can be a continuous wave ytterbium-doped distributed feedback semiconductor laser, or a single Nd:YVO 4 Crystal continuous wave lasers.

[0020] 2. The laser radar transmitter system uses KTP crystal as the nonlinear working substance. KTP is cut into 8mm×8mm×12mm, the surface of the crystal is coated with broadban...

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Abstract

The invention discloses an 828nm atmospheric water vapor detection differential absorption lidar transmitter system, which includes an 828nm continuous wave seed laser, a single-longitudinal-mode narrow-linewidth pulse Nd:YAG laser, a KTP ring cavity optical parametric oscillator, a PDH seed laser wavelength stabilization unit of a multi-channel absorption cell based on water vapor absorption, andan optical parametric oscillator resonant cavity length locking unit based on a scanning holding technology. The transmitter system can generate single-frequency laser pulse suitable for atmosphericwater vapor detection, and is the core structure of differential absorption lidar.

Description

technical field [0001] The invention relates to the field of laser radar remote sensing measurement, and also relates to a ground-based or vehicle-mounted atmospheric water vapor remote sensing instrument, in particular to a differential absorption laser radar transmitter system that detects atmospheric water vapor distribution and works in the 828nm band. Background technique [0002] Lidar is an optical active remote sensing device that emits laser beams to detect target feature quantities. It has become one of the most effective means to detect atmospheric composition and its vertical distribution. The transmitter emits ultra-short laser pulses of 5 to 200 ns, and after entering the atmosphere, it continuously interacts with the substances to be measured in the atmosphere during its travel, and the back Raman scattering, back Mie scattering and back Rayleigh scattering can all be used as echoes. The wave signal is received by the telescope, detected by the photodetector a...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S3/083H01S3/13G01S7/484
CPCH01S3/083H01S3/1303H01S3/1305G01S7/484
Inventor 洪光烈李嘉唐
Owner SHANGHAI INST OF TECHNICAL PHYSICS - CHINESE ACAD OF SCI
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