A method to reduce the influence of chromatic aberration of beam-splitting prism on the wavefront detection accuracy of phase difference method
A spectroscopic prism and wavefront detection technology, applied in the field of optical detection, can solve the problems of reducing the wavefront detection accuracy, blurred images, etc., and achieve the effect of improving the wavefront detection accuracy
Active Publication Date: 2022-05-31
CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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The beamsplitter prism is a transmission optical device. The refractive index of light of different wavelengths is different, and the wave aberration introduced is different (that is, there is chromatic aberration), which causes the collected point spread function (PSF) image to become blurred and reduces the accuracy of wavefront detection.
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[0048] The present invention will be described in further detail below in conjunction with the accompanying drawings.
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[0063] Therefore, it can be seen that the chromatic aberration introduced by the dichroic prism has certain regularity in terms of the aberration type. Specifically,
[0068] In a specific spectral band range, the spectral intensity changes relatively gently with wavelength, which can be appropriately simplified. Although generally used
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[0071] The point spread function (PSF) image in the presence of chromatic aberration can pass through multiple single wavelength point spread functions (PSF)
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[0076] The actual detector imaging is a process of continuous integration of the spectrum of different wavelengths. However, when mathematical modeling is performed, it can be
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[0092] The above is only a preferred embodiment of the present invention, it should be pointed out that for those of ordinary skill ...
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The method for reducing the influence of the chromatic aberration of the beam-splitting prism on the wavefront detection accuracy of the phase difference method belongs to the field of optical detection, including clarifying the aberration type affected by the chromatic aberration of the beam-splitting prism; Correct the imaging model between the aberration coefficients; determine the specific quantitative functional relationship between the aberration coefficient change caused by the chromatic aberration of the spectroscopic prism and the wavelength according to the size and material of the spectroscopic prism, the spectral bandwidth, and the central wavelength, and obtain the PSF image and The imaging model between the aberration coefficients at the central wavelength; collect two PSF image pairs at different focal plane positions; use the imaging model and PSF image pair after correcting the chromatic aberration to establish a nonlinear equation system; establish the objective function using the numerical maximum Optimization algorithms solve systems of nonlinear equations. The invention improves the wavefront detection accuracy of the wavefront detection method based on the principle of phase difference when the beam splitting prism is applied and non-monochromatic light is imaged.
Description
A method to reduce the influence of the chromatic aberration of the beam splitter on the wavefront detection accuracy of the phase-difference method technical field The invention belongs to the technical field of optical detection, be specifically related to a kind of reduction prism chromatic aberration to phase difference method wavefront A method to detect accuracy effects. Background technique [0002] Large aperture astronomical telescopes have important strategic significance for my country's scientific and technological progress and social development. not only It is a key device for studying a series of major frontier scientific issues such as the evolution of the universe, the origin of life, the nature of dark matter and dark energy, etc. It can also provide an important driving force for original innovation in the field of optoelectronics, and lead to the rapid development of several cutting-edge technologies and their industries. [0003] The increase of the...
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IPC IPC(8): G02B27/00
CPCG02B27/0012
Inventor 鞠国浩徐抒岩白晓泉许博谦姜凤义
Owner CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI