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Laser receiving and echo apparatus with Bragg acousto-optic modulator

A laser receiver and modulator technology, applied in the field of applied optics, can solve the problems of large loss of light energy, low diffraction efficiency, and many orders

Inactive Publication Date: 2005-12-21
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantage of this scheme is that the light energy loss is large and the system structure is more complicated.
However, there are many orders of Ramanis diffraction, the beam energy is dispersed, and the diffraction efficiency is low.

Method used

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  • Laser receiving and echo apparatus with Bragg acousto-optic modulator
  • Laser receiving and echo apparatus with Bragg acousto-optic modulator
  • Laser receiving and echo apparatus with Bragg acousto-optic modulator

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Embodiment Construction

[0052] The whole laser receiving and echo device such as Figure 4 As shown, its composition and positional relationship are the same as those in the technical solution of the summary of the invention, and will not be described in detail here.

[0053] The transmittances of the three convex lenses are all above 99%, the apertures of lens 2 and lens 3 are 1 cm, the reflectance of the beam splitter is 95%, and the transmittance is 5%. The aperture of lens 1 can be determined according to the peak power of the interrogation light emitted by the interrogator and the distance of recognition. When the peak power P=15W of the interrogation light sent by the interrogator, the visibility of the atmosphere is 15Km, and the loss coefficient is α=0.2. Optical transmittance τ of the system t =0.95, the optical transmittance of the receiving system is τ r =0.98, when the communication and recognition distance Z=500m~1000m, the aperture of lens 1 can be taken as d=6cm, that is, the lens ar...

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Abstract

The disclosed device comprises three pieces of parallel placed convex lenses with coincided centerlines, a beam splitting plate, a plane reflector and a Bragg acousto-optic modulator. Received by lens 1 and passing through lens 2, an inquire light becomes a narrow beam. Then, passing through the beam splitting plate, the beam is divided into a transmission light and a reflection light. The transmission light is a receiving signal. Reflected by the plane reflector, the reflection light forms an echo light beam and passing through the Bragg acousto-optic modulator to return in direction parallel to the inquire light. Diaphragm and light filter can be added to the device to filter the inquire light in space and frequency in order to raise detection SNR at response party. Features are: small loss of luminous energy, simple structure, and small size. Moreover, the invention increases communication and identification distances, and possesses better modulation effect.

Description

technical field [0001] The invention belongs to the technical field of applied optics, and in particular relates to a laser receiving and echo device in laser communication or target identification. Background technique [0002] Laser communication is a communication method that uses laser beams as a carrier for communication. The basic laser communication system consists of a transmitter (interrogator), a receiver (responder) and a space atmospheric channel. Laser target recognition is essentially a kind of laser communication under certain conditions. The basic laser target recognition system is also composed of a transmitter (interrogator), a receiver (responder) and a space atmospheric channel. In laser communication or laser target recognition, after the interrogating beam sent by the inquiring party is received by the responding party’s receiving antenna (usually a receiving device composed of optical lenses), the interrogating beam needs to be divided into two parts,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S17/74H04B10/67
Inventor 杨亚培张向前聂在平戴基智饶建珍刘永智
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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