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Co-aperture emission and correction telescope combining 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 effect of improving detection accuracy, wide application range and small light spot

Active Publication Date: 2016-06-01
INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
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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 to perform pre-correction of the uplink beam. The effect of the spot is 1 / 2 smaller, but this method needs to find a suitable brighter star target in the emission path, which greatly limits the observation sky area of ​​the system

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  • Co-aperture emission and correction telescope combining Rayleigh beacon and sodium beacon
  • Co-aperture emission and correction telescope combining Rayleigh beacon and sodium beacon
  • Co-aperture emission and correction telescope combining Rayleigh beacon and sodium beacon

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[0020] like figure 1 As shown, for the linearly polarized light emitted from the laser, the central wavelength is precisely aligned with D 2a line, and assigns 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, and then output through the beam expansion and collimation of the transmitting telescope, forming a sodium beacon at an altitude of 90km. In the upward path of the laser, the atmospheric molecules in the lower layer 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 foc...

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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 optics device, in particular to a common-aperture transmitting and correcting telescope combining Rayleigh beacons and sodium beacons, which is suitable for artificial beacons with poor atmospheric observation conditions and high requirements for beacon spot quality in an adaptive optics system. 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 caused by atmospheric turbulence to the wavefront disturbance. When the brightness of the object itself is not enough or there are no stars that meet the conditions within the equihalation angle of the object, it is necessary to use artificial beacons to detect wavefront distortion. At present, there are two main types of beacons: one is the sodium beacon, which uses the backscattered light generated by the resonance scattering of sodium atoms...

Claims

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Application Information

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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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