Laser frequency shift detecting method and device with dual-cavity F-P interferometer which is formed on the basis of polarization maintaining optical fibers

Abstract

The invention discloses a laser frequency shift detecting method and device with a dual-cavity F-P interferometer which is formed on the basis of polarization maintaining optical fibers. The device comprises a laser device, an acoustic optical modulator (AOM), an erbium-doped optical fiber amplifier (EDFA), quarter-wave plates, a collimator, a telescope, a first polarization maintaining optical fiber, a first circulator, a first narrow-band fiber bragg grating (FBG), a polarization controller (PC), an optical fiber F-P interferometer, an F-P interferometer controller, a polarization beam splitter (PBS), a first single photon counting module (SPCM), a second SPCM, a second polarization maintaining optical fiber, a second circulator, a second narrow-band FBG, a third SPCM and an acquisition card. According to the laser frequency shift detecting method and device with the dual-cavity F-P interferometer which is formed on the basis of the polarization maintaining optical fibers, a laser radar fiber integrated single-emission double-receiving light path is developed, two receiving optical fibers are spliced in the same cladding to form a dual D involution optical fiber, separation of energy detection and frequency shift detection is achieved, the signal to noise ratio of the frequency shift detection is increased, a dual-edge detection technology can be successfully achieved only by the single-channel F-P interferometer, the energy utilization ratio is high, and the method is simple.

Description

technical field [0001] The invention belongs to the technical field of optical detection, and in particular relates to a laser frequency shift detection method and equipment based on a polarization-maintaining optical fiber forming a double-cavity F-P interferometer. Background technique [0002] Since the 1980s, the direct detection wind lidar technology has gradually matured, and the direct detection radar technology has emerged in the field of wind detection lidar with its unique advantages, such as high time resolution and high spatial resolution. Basic research on Doppler direct detection wind lidar based on F-P interferometer has been carried out at home and abroad, including system parameter design, simulation and other work, foreign countries such as: OHP Observatory in France; ALAMOR jointly developed by Germany, Britain, Norway, etc. Systems; GLOW and Groundwinds systems developed by NASA, Natl Ctl Atmospher Res, and Michigan Aerospace Corporation of the United Sta...

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Problems solved by technology

[0009] The object of the present invention is: in the double-edge Doppler frequency shift detection technology, the double-edge is realized by using a multi-channel F-P interferometer, which has high manufacturing cost and is greatly affected by vibration, ambient temperature and humidity, and the space optical multi-channel Multiple system correction constants are introduced using

At the same time, in the dual-edge detection technology, in order to correct the influence of aerosol scattering in Rayleigh scattering radar, or to correct the influence of Rayleigh scattering in aerosol radar, an energy monitoring channel needs to be set in the receiving optical path. The energy monitoring of existing systems usually It is realized by the method of splitting, which reduces the signal-to-noise ratio of the signal used for frequency discrimination

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