Full-aperture coaxial laser transmitting and echo receiving system

Abstract

The invention relates to a full-aperture coaxial laser transmitting and echo receiving system. The full-aperture coaxial laser transmitting and echo receiving system disclosed by the invention comprises a light source, a light beam shaping unit, a polarization spectroscope, a strobing gate, a telescope, a light filter, a focusing unit, a photoelectric detecting and data processing unit and a control unit, wherein the light beam shaping unit and the polarization spectroscope are in sequence arranged on a laser beam optical axis of the light source; the light filter, the focusing unit and the photoelectric detecting and data processing unit are in sequence arranged on a transmission surface of the polarization spectroscope; the strobing gate, the telescope and a target are in sequence arranged on a reflecting surface of the polarization spectroscope; the input end of the control unit is connected to an output end of the light source; the output end of the control unit is connected to the input end of the strobing gate; the photoelectric detecting and data processing unit is connected to the telescope and the focusing unit. By adopting the full-aperture coaxial laser transmitting and echo receiving system disclosed by the invention, the full-aperture coaxial laser transmission and echo receiving of the laser of the same waveband are achieved, the signal to noise ratio of echo signal receiving is improved, the cost of a transmitting-receiving system is reduced and the damage threshold of the system and the utilization efficiency of the transmission laser are improved in a total-reflection laser transmission way.

Description

technical field [0001] The invention belongs to the field of light beam control, and in particular relates to a full-aperture laser coaxial emission and echo receiving system. Background technique [0002] Active tracking lighting, space laser communication, lidar and directed energy applications all involve the issue of higher energy laser emission and weak echo reception in the same band. Especially for long-distance tiny targets, more stringent requirements are put forward for the damage threshold of the laser transmitting system and the noise suppression level of the echo receiving system. [0003] The current laser transceiver system adopts two technical schemes: one is to adopt the method of separating transceiver, and the other is to adopt the method of coaxial transmission and reception; in the former scheme, the system requires two sets of independent telescopes, which makes the whole system more complicated and There is a detection blind spot in the tracking and a...

AI Technical Summary

Problems solved by technology

However, in the same set of telescopes, the stronger emitting lasers in the same band will cause serious interference to the weak echo signals; in order to solve the above problems, there are currently several methods to achieve coaxial transmission and reception

[0004] The first method uses a semi-transparent and semi-reflective beam splitter to achieve coaxial transmission and reception, but this method will cause the transmitted laser and echo signals to lose 50% each when passing through the beam splitter, resulting in an overall energy utilization rate of less than 25%.

[0005] The second way of using area splitting is to divide a set of telescopes into two areas, one side is used for laser emission and the other side is used for echo reception; this method separates emission and reception in space, reducing the telescope Space utilization, unable to achieve full-aperture laser emission and echo reception, resulting in low overall efficiency

But they have a common defect: that is, there are some transparent optical devices in the optical path

No matter what material these optical devices are made of, they have a certain damage threshold, which will affect the higher energy laser emission, and some will even burn out, thus limiting the application range of the coaxial laser transceiver system

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