Device for locking laser frequency of seed light based on seed injection type laser

Abstract

The invention discloses a device for locking a laser frequency of seed light based on a seed injection type laser. The device comprises the seed injection type laser, an electrooptic modulator, a tunable F-P etalon, a beam splitting sheet, a photoelectric detector, a data acquisition and analysis unit and an F-P etalon controller, wherein the seed injection laser is used for outputting a continuous seed laser with the wavelength of 1064nm; the data acquisition and analysis unit is used for obtaining a transmissivity measured value of the locking laser on a locking channel of the tunable F-P etalon according to a segmentation proportion of the locking laser and comparing the measured value with a frequency locking reference value and controlling the tunable F-P etalon controller for carrying out regulation if the measured value is different from the frequency locking reference value so that the transmissivity measured value is kept in the frequency locking reference value. According to the device, the signal to noise ratio and the accuracy of luminous intensity measurement in frequency locking can be improved, and the measurement precision of a Rayleigh anemometry laser radar system is improved.

Description

technical field [0001] The invention relates to the technical field of laser remote sensing, in particular to a device for locking laser frequency based on seed light of a seed injection laser. Background technique [0002] At present, the Rayleigh wind lidar is a powerful tool for observing the wind field in the middle and upper atmosphere. The radar converts the frequency information of the optical signal into intensity information through a frequency discriminator, and compares the relative frequency shift of the outgoing light and the atmospheric backscattered light. , according to the Doppler principle, the atmospheric wind speed in the direction of the echo signal is retrieved. Most Rayleigh wind lidars use seed-injected Nd:YAG pulsed lasers as the radar light source: a small frequency-stabilized 1064nm laser outputs continuous 1064nm laser light, which is injected into a larger laser oscillating cavity and In the amplification stage, a 1064nm laser pulse with the sam...

AI Technical Summary

Problems solved by technology

[0005] In the frequency locking scheme of the prior art, the locking laser used for frequency locking is a 532nm or 355nm pulsed laser emitted into the atmosphere. When measuring the pulse light intensity, the measurement signal-to-noise ratio is low; Soon, the response time of the usual detectors cannot keep up, which will lead to distortion of the measurement of the pulse waveform and poor accuracy. These shortcomings will lead to low accuracy and accuracy of the measured transmittance, which will further lead to low measurement accuracy of the radar system.

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