Method for designing light beam folding type liquid crystal adaptive optical system

Abstract

The invention belongs to the field of adaptive optics, and discloses a method for designing a light beam folding type liquid crystal adaptive optical system. As is shown in figure 1, a plurality of off-axis parabolic mirrors and reflectors are introduced and combined to fold light beams many times, and the size of the system is reduced. Due to the fact that a Hartmann detector and a liquid crystal corrector are under feedforward control, the feedforward control should be switched into feedback control when signal measurement is responded, the fourth off-axis parabolic mirror 13 is removed out of a light path, emergent parallel light beams aligned to the third off-axis parabolic mirror 12 are inserted into the fifth reflector 18 which is arranged by 45 degrees in a detection branch, light beams passing through the liquid crystal corrector 10 enter the Hartmann wavefront detector 17 after axis folding, light beams emitted out of a third lens 16 are cut off, and meanwhile a fast galvanometer 4 is only adopted as a common reflector. An adaptive imaging light path and a liquid crystal corrector response signal measurement light path can be switched, and the alignment misplacing problem of a middle light path of the adaptive system after and before switching is avoided well.

Description

technical field [0001] The invention belongs to the field of adaptive optics, and relates to a design method of a light beam folded and compact liquid crystal adaptive optics imaging system. It involves the combined structure of optical elements such as parabolic mirrors, reflectors, dichroic mirrors, and PBS beam splitters, and key elements in adaptive optics systems such as liquid crystal wavefront correctors, Hartmann wavefront detectors, and fast galvanometers. It is said to be a design method of a liquid crystal adaptive optics imaging system equipped with a beam folding optical structure of a large-aperture ground-based telescope. Background technique [0002] The liquid crystal adaptive optics system can compensate and correct the optical wavefront distortion caused by the atmosphere in real time and restore the high-resolution imaging of the telescope, so it has important applications in large-aperture ground-based telescopes. However, as the aperture of the telesco...

AI Technical Summary

Problems solved by technology

However, as the aperture of the telescope increases, the size of the optical elements in the liquid crystal adaptive optics system also increases accordingly. If a simple transmissive structure is still used, the volume of the system will increase significantly

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