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Shack-Hartmann wavefront sensor of self-adapting optical system

An adaptive optics and sensor technology, applied in optics, scientific instruments, measurement optics, etc., to reduce technical difficulty, expand wavefront detection capabilities, and ensure reliability.

Inactive Publication Date: 2009-01-14
INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
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Problems solved by technology

It is an insurmountable technical difficulty to require a CCD detector with so many pixels to measure dynamic aberration with a sampling frequency not lower than 1000Hz.

Method used

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  • Shack-Hartmann wavefront sensor of self-adapting optical system
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  • Shack-Hartmann wavefront sensor of self-adapting optical system

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Embodiment Construction

[0029] The present invention will be described in detail below with reference to the drawings and specific embodiments.

[0030] The Shaker-Hartmann wavefront sensor used in the adaptive optics system of the very large-aperture astronomical telescope in this embodiment is such as figure 1 As shown, it consists of a beam reduction system, an array lens, a beam splitting system, two sets of coupled objective lenses, two sets of CCD detectors, and a set of signal synchronization acquisition system. In this embodiment, the beam splitting system is composed of a beam splitter and two mirrors, and the detection wavefront is spatially divided into two sub-regions. Each sub-area of ​​the detection wavefront is detected by a CCD detector with a smaller number of pixels, and the signal synchronization acquisition system synchronizes the acquisition and processing of the signals of the two sets of CCD detectors.

[0031] The array lens is a necessary component of the Shaker-Hartmann wavefro...

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Abstract

A Shack-Hartmann wavefront sensor used for an adaptive optical system is suitable for a large-diameter astronomical telescope and comprises a beam-shrinking system and an array lens. The wavefront sensor is characterized in that a beam-dividing system, at least two sets of coupling object lens, at least two sets of CCD detectors and a signal synchronous collecting system are also adopted; after the wavefront information is divided into the wavefront sub-array by the array lens, the beam-dividing system is adopted to divide the wavefront sub-array into at least two sub zones in space and each sub-zone adopts one coupling object lens and one CCD detector for slope detection; the wavefront information of each sub-zone is collected and processed by the signal synchronous collecting system; the obtained slopes are combined and then are recovered to get a complete wavefront phase distribution; at least two sets of detector are adopted to work in parallel so as to reduce the capability requirement to the CCD detectors and effectively overcome the technical difficulties to the CCD detector by the excessive detection sub apertures; the wavefront sensor is insensitive to the optical path overall errors and the tilt errors which can not be easily overcome in the assembling-regulating process of the beam-dividing system, thus adding no the complexity to the sensor system.

Description

Technical field [0001] The invention relates to a Shak-Hartmann wavefront sensor, in particular to a Shak-Hartmann wavefront sensor applied to an adaptive optical system of a very large-aperture astronomical telescope. Background technique [0002] Adaptive optics technology was proposed in the 1950s and has been rapidly developed subsequently. From the initial stage of military application, and gradually developed to the field of astronomical observation applications. Since the adaptive optics system effectively corrects the effects of atmospheric turbulence, almost all large-aperture telescopes in the world are equipped with adaptive optics systems. [0003] Thanks to the successful application of adaptive optics technology, the potential of large-aperture astronomical telescopes has been fully utilized. Currently, the world's largest operating telescope with a diameter of 10m. Astronomers are not satisfied with this. The astronomical community of various countries has carried ...

Claims

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Application Information

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IPC IPC(8): G02B26/06G02B17/06G02B3/00G01J9/00
Inventor 张昂饶长辉张雨东姜文汉
Owner INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
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