Differential absorption laser radar transmitter for detecting atmospheric pressure

Abstract

The invention discloses a differential absorption laser radar transmitter for detecting atmospheric pressure. The transmitter actively stabilizes the wavelength of a continuous wave semiconductor seedlaser device on R21 and R22 absorption lines of HCN gas or R9 and R8 absorption lines of acetylene C2H2 gas by means of the pound drow Howe Technology, the seed laser is injected into an annular resonant cavity of an optical parametric oscillator by adopting a scanning-maintaining-pumping method, and the cavity length is locked; an optical parametric oscillator outputs dual-wavelength signal light within the wave band of 1529.4+ / -0.6 nm or 1520nm+ / -1.0 nm, the signal light is converted into dual-wavelength laser pulses within the wave band of 764.4-765.0 nm or 759.5-760.5 nm through a frequency multiplier, the energy of the dual-wavelength laser pulses is amplified through a parametric amplifier, and the transmitter finally outputs detection laser and reference laser which are stable in wavelength and large in energy, units are organically integrated to form a differential absorption laser radar transmitter. The transmitter is advantaged in that a transmitter system ensures stabilityof the detection wavelength and the reference wavelength of the transmitter on the premise of ensuring higher transmitted pulse energy.

Description

technical field [0001] The invention relates to a remote sensor for detecting atmospheric pressure, in particular to a transmitter of a differential absorption laser radar for detecting atmospheric pressure. Background technique [0002] Atmospheric pressure is one of the most important meteorological parameters. At present, there are few optical and microwave remote sensors in orbit that can observe the earth's surface pressure, such as the medium-resolution imaging spectrometer MERIS, the US OCO-2 and Japan's GOSAT, POLDER and other infrared Remote sensor, its accuracy can not meet the requirements of the World Meteorological Organization (1 ~ 2hPa). [0003] NASA Laboratory for Atmospheres, NASA Goddard Space Flight Center C.LurenceKorb and other experts proposed in 1983 the idea of ​​using differential absorption lidar to detect atmospheric pressure based on the oxygen A absorption band groove; Schwemmer et al. expounded in 1987 The principle of the differential absorpt...

AI Technical Summary

Problems solved by technology

The fatal weakness is that the single pulse energy is too small (<100μJ), which can be used on aircraft platforms, but it is unimaginable for space applications

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