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A Common Aperture Transmitting and Correcting Telescope Combined with Rayleigh Beacon and Sodium Beacon

A sodium beacon and telescope technology, applied in telescopes, optics, instruments, etc., can solve problems such as restricting the observation sky area, and achieve the effects of improving detection accuracy, simple and compact structure, and wide application range

Active Publication Date: 2018-04-13
INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, the 3.5-meter telescope of the Starfire Optical Range (SOR), in order to obtain a smaller spot size, selects a stellar target on the launch path for the beacon of the uplink beam pre-correction, realizes the pre-compensation of the launch beam, and obtains the spot size The effect is 1 / 2 smaller than the original spot, but this method needs to find a suitable brighter star target in the launch path, which greatly limits the observation sky area of ​​the system

Method used

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  • A Common Aperture Transmitting and Correcting Telescope Combined with Rayleigh Beacon and Sodium Beacon
  • A Common Aperture Transmitting and Correcting Telescope Combined with Rayleigh Beacon and Sodium Beacon
  • A Common Aperture Transmitting and Correcting Telescope Combined with Rayleigh Beacon and Sodium Beacon

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Embodiment Construction

[0020] like figure 1 shown, the linearly polarized light from the laser with the center wavelength precisely aligned with D 2a spectral line, and assign 10% of the energy to D 2b On the spectral line, it reaches the spectroscopic system through the reflection of the 19-unit deformable mirror. At this time, the spectroscopic system reflects the emitted laser light. After passing through the 1 / 4 wave plate, the linearly polarized light becomes circularly polarized light, which is then expanded and collimated by the transmitting telescope to form a sodium beacon at an altitude of 90 km. In the upward path of the laser light, the low-level atmospheric molecules will produce Rayleigh scattering, and the backward Rayleigh scattered light at this time can be used as a Rayleigh beacon. The brightness of the Rayleigh beacon also decays exponentially with the increase of altitude. The lower the altitude, the brighter the beacon, but the stronger the focus anisotropy. In the case tha...

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Abstract

The invention relates to a co-aperture emission and correction telescope combining the Rayleigh beacon and the sodium beacon. The telescope is formed by a sodium yellow-light laser, a beacon upstream light beam real-time compensation system and an emission telescope. The sodium yellow-light laser gives out laser of 589 nm so as to form the sodium beacon in a sodium layer in high-altitude excitation atmosphere of about 90 km, and generate the Rayleigh beacon in low altitude lower than 25 km. A low-density deformable reflection mirror and an inclining reflection mirror in the real-time compensation system carry out pre-correction on beacon upstream light beams, thereby achieving optimization of sodium beacon light spot shapes excited in the high-altitude atmosphere. The real-time light beam compensation system is mainly formed by the deformable reflection mirror, the inclining reflection mirror, a light splitting mechanism, a Rayleigh beacon wavefront detector and a wavefront controller. In this way, problems of expansion of sodium beacon shapes and inaccuracy of wavefront detection caused by poor observation address conditions and quite low observation angles of a telescope are solved and the telescope is characterized by compact structure, wide application range and easy achievement.

Description

technical field [0001] The invention is an adaptive optical device, in particular to a common aperture transmitting and correcting telescope combined with a Rayleigh beacon and a sodium beacon, which is suitable for man-made beacons with poor atmospheric observation conditions and high requirements on the quality of beacon light spots in adaptive optics systems. Background technique [0002] Adaptive Optics (AO) is a new technology developed in the past 20 years. The key is to compensate and correct the observation target by detecting the distortion of the wavefront disturbance caused by atmospheric turbulence. When the brightness of the object itself is insufficient or there are no stars that meet the conditions within the halo angle of the object, artificial beacons need to be used to detect wavefront distortion. At present, there are two main beacons: one is the sodium beacon, which uses the backscattered light generated by the resonance scattering of sodium atoms at an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B23/10
CPCG02B23/105
Inventor 魏凯黄建李敏晋凯江长春张雨东
Owner INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
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