Optimization for complex optical system

Aberration retrieval and spatial coherence property measurement for imaging system


Summary

In this research, we try to find the aberration of a complex optical system from only image measurements by solving optimization problems. Besides, we develop methods for measuring the the spatial coherence property of the light and for diffractive imaging.


Research description

The image formed by an imaging system is often blurred by aberrations. We aim to retrieve the aberrations from only the blurred images using sophisticated computational methods, instead of using complicated setup such as interferometry or wavefront-sensor. In this project, we study the retrieval of shift-invariant aberrations from through-focus images of an extended object, and the retrieval of shift-variant aberrations of lithography system from the intensity measurements generated using a pair of matched periodic mask.

Spatial coherence is among the fundamental properties of light. It describes the statistical correlation between fields at a pair of locations. However, the measurement of spatial coherence is remarkably challenging, which limits the control and the optimization of spatial coherence in a broad range of key applications. In our research, we investigate the following problem: illuminating a complex-valued object by spatially partially coherent light , how do we reconstruct the transmission/reflection of the object and retrieve the mutual coherence function of the illumination from only the far-field diffraction pattern.


Keywords

Projects.

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Optimization for complex optical system

Aberration retrieval and spatial coherence property measurement for imaging system ...

project

Optimization for complex optical system

Superresolution imaging with focused radially polarized beam

Focused radially polarized beam is used to image non-fluorescent specimens to enhance the spatial resolution of conventional confocal microscopes. ...

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Superresolution imaging with focused radially polarized beam

Application of hyperbolic meta-materials

What is the ideal optical material for imaging? ...

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Application of hyperbolic meta-materials

Phase Retrieval Imaging

Ptychography with partially coherent illumination ...

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Phase Retrieval Imaging

Influence of the mechanical Environment on Optical Fiber based Sensor

Understanding possible limitation of some fiber optic sensor technologies ...

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Influence of the mechanical Environment on Optical Fiber based Sensor

News.

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Beijing Institute of Space Mechanics and Electricity

A delegation of  50 people from BISME (Bejing Institute of Space Mechanics and Electricity) has visited the Optics Group. The delegation was in  the Netherlands to attend the 6th International Symposium ...

News - October 7, 2019

Beijing Institute of Space Mechanics and Electricity

Weekend of Science – Oct 5-6, 2019

The Weekend of Science is a national science weekend. Every year, various technical institutions open their doors to provide extra activities. This year the theme of our Weekend of Science is: LIGHT. Date ...

News - September 25, 2019

Weekend of Science – Oct 5-6, 2019

Face2Phase – Oct 21-23, 2019

The conference Fase2Phase, 2nd Edition, addresses imaging with phase information and covers topics such as lensless imaging, aberration retrieval, adaptive and active optics, ptychography, holography, tomography, phase retrieval and applications. Date : 21 ...

News - September 10, 2019

Face2Phase – Oct 21-23, 2019