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Continuous wave frequency adjustment coherent optical fiber laser radar

A laser radar and fiber laser technology, which is applied in the re-radiation of electromagnetic waves, radio wave measurement systems, and the use of re-radiation, etc., can solve the problem of inability to obtain target motion parameters, and achieve the advantages of system engineering, small size, and integration. high effect

Inactive Publication Date: 2010-01-06
BEIHANG UNIV
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AI Technical Summary

Problems solved by technology

This method can only measure the distance, so the motion parameters of the target cannot be obtained

Method used

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  • Continuous wave frequency adjustment coherent optical fiber laser radar
  • Continuous wave frequency adjustment coherent optical fiber laser radar
  • Continuous wave frequency adjustment coherent optical fiber laser radar

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Embodiment 1

[0019] Fiber Laser 3 with KOHERAS ADJUSTIK TM -E15 type single wavelength distributed feedback ultra-narrow linewidth DFB fiber laser. The system can be dynamically wavelength locked, or provide thermal wavelength tuning. The interface of the PZT driver is connected to the scanning voltage. The system realizes tuning in the range of 30pm through fast PZT (kHz tuning bandwidth). locking. Its working wavelength is 1550nm, the spectral width of the outgoing laser is less than 1kHz, and the output average power is 20mW, and it has a fiber coupling output mode; the optical antenna 6 adopts a Cassegrain type optical telescope, its aperture is 200mm, and its focal length is (720mm); the transmission fiber is a single-mode fiber (Numerical aperture NA=0.14), mode field diameter (8.2 μ m)); Fiber coupler 1, 2 are 1X2 type, and its beam splitting ratio is 1 / 99; Fiber amplifier 8 is an erbium-doped fiber amplifier, and selects Danish KOHERAS company to produce The AEDFA-BO-18 type pro...

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Abstract

This invention belongs to a laser radar domain, which relates to a continuous wave frequency modulation cohere laser radar which is on the basis of optical fiber laser device. Optical fiber laser device is used as light source, of which launching wnd links optical fiber coupler. Optical fiber coupler divides energy of light into two parts. Moiety is used as characteristics light, which can be directly inputted in an input end of secondary optical fiber coupler, the other part is inputted in expanding bunch lens device; after expanding bunch lens compresses laser emission angle, direct surveyed area by 2-dimensional scanner; echo-signal is feed-through one end of transmission optical fiber through optical antenna by 2-dimensional scanner, the other end of transmission optical fiber contacts secondary optical fiber coupler by optical fiber amplifier. After echo-signal and characteristics light are combined and interfered to mix frequency by optical fiber coupler, enter monitor component element. Monitor component element can transform and magnify signal photoelectricity, output, post it in computer by collecting card, carry out data processing. This invention has features of small volume, light quality, high integrated degree, good stability, intelligentification and modular.

Description

technical field [0001] The invention belongs to the field of laser radar, and relates to a continuous wave frequency modulation coherent laser radar based on a fiber laser. Background technique [0002] LiDAR and related technologies have a strong military background. The United States and other military developed countries have invested huge manpower and material resources in LiDAR and related technologies, and LiDAR technology has achieved rapid development. At present, various traditional laser radars mainly use discrete optical devices such as optical prisms, lenses, and gratings to build optical paths. With the continuous development and maturity of fiber optic light sources and various fiber optic components, it is possible to build a laser radar with an all-fiber optical path. The volume and quality of this all-fiber laser radar are much smaller than other types of laser radars currently used, do not require complex cooling systems, and can be used under various rela...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S17/32
Inventor 杨远洪夏海云李莉
Owner BEIHANG UNIV
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