Experimental evidence of the theoretical spatial frequency response of cubic phase mask wavefront coding imaging systems

Somayaji, Manjunath; Bhakta, Vikrant R.; Christensen, Marc P.

doi:10.1364/oe.20.001878

Cited by 12 publications

(5 citation statements)

References 30 publications

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“…An experimental system was set up using the 25 μm pinhole to serve as the object. A similar setup is used by Somayaji et al [29] to measure cubic PSF images.…”

Section: Parametric Optimizationmentioning

confidence: 99%

Advanced Imaging Optics Utilizing Wavefront Coding

Scrymgeour

Boye

Adelsberger

2015

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Image processing offers a potential to simplify an optical system by shifting some of the imaging burden from lenses to the more cost effective electronics. Wavefront coding using a cubic phase plate combined with image processing can extend the system's depth of focus, reducing many of the focus-related aberrations as well as material related chromatic aberrations. However, the optimal design process and physical limitations of wavefront coding systems with respect to first-order optical parameters and noise are not well documented. We examined image quality of simulated and experimental wavefront coded images before and after reconstruction in the presence of noise. Challenges in the implementation of cubic phase in an optical system are discussed. In particular, we found that limitations must be placed on system noise, aperture, field of view and bandwidth to develop a robust wavefront coded system.

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“…An experimental system was set up using the 25 μm pinhole to serve as the object. A similar setup is used by Somayaji et al [29] to measure cubic PSF images.…”

Section: Parametric Optimizationmentioning

confidence: 99%

Advanced Imaging Optics Utilizing Wavefront Coding

Scrymgeour

Boye

Adelsberger

2015

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“…To bring all the different planes into focus, it is necessary to correct for the defocus. This may be done either by using a cubic phase mask (67) or with a volume hologram. The first method (cubic phase mask) requires an additional postprocessing step of deconvolving the captured image with the point-spread function (68); the deconvolved image is therefore equivalent to the sum of all the planes.…”

Section: Temporal Focusingmentioning

confidence: 99%

High-Throughput Nonlinear Optical Microscopy

Yew

Rowlands

2013

Biophysical Journal

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High-resolution microscopy methods based on different nonlinear optical (NLO) contrast mechanisms are finding numerous applications in biology and medicine. While the basic implementations of these microscopy methods are relatively mature, an important direction of continuing technological innovation lies in improving the throughput of these systems. Throughput improvement is expected to be important for studying fast kinetic processes, for enabling clinical diagnosis and treatment, and for extending the field of image informatics. This review will provide an overview of the fundamental limitations on NLO microscopy throughput. We will further cover several important classes of high-throughput NLO microscope designs with discussions on their strengths and weaknesses and their key biomedical applications. Finally, this review will close with a perspective of potential future technological improvements in this field.

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“…2.1, under the condition of spherical aberration suppression, we can derive a logarithmic phase mask by using (2)(3)(4) and (2-7) [11]:…”

Section: Logarithmic Phase Maskmentioning

confidence: 99%

“…Wavefront coding imaging technology(WFC) was first proposed to extend the depth of focus of an optical system by Dowsky and Cathey in 1995 [1], and has attracted much attentions since then [2][3][4]. The technique is based on the modification of the wavefront (or wavefront coding) by means of a suitable phase mask (such as a cubic phase mask) placed at the aperture stop of the system.…”

Section: Introductionmentioning

confidence: 99%

Comparative study of wavefront coding imaging with rotational and non-rotational symmetric phase masks

Zhao

et al. 2013

SPIE Proceedings

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Wavefront coding enables conventional optical imaging systems to operate over an extended depth of field/focus by modifying the light field using a specially designed phase mask. Different phase masks can be used to alter the transmitted wavefront of the optical system which may result in different performances in terms of the capability of the depth-of-focus extension, aberration suppression and the process of imaging acquirement. In this paper, we present a comparative study on the performances of two major different categories of the phase mask, i.e., rotational symmetric and asymmetric type phase masks. Three different types of phase masks that are of cubic, quartic, and logarithmic phase profile are investigated. Fabrication and metrology of a cubic mask is conducted and a full cycle of imaging process including the image coding and decoding is performed.Keywords: wavefront coding; depth of focus; rotational symmetric and asymmetric; phase mask INTRODUCTIONWavefront coding imaging technology(WFC) was first proposed to extend the depth of focus of an optical system by Dowsky and Cathey in 1995[1], and has attracted much attentions since then [2][3][4]. The technique is based on the modification of the wavefront (or wavefront coding) by means of a suitable phase mask (such as a cubic phase mask) placed at the aperture stop of the system. The major function of the WFC is to modify the point spread function (PSF) of the system in such a way that it becomes invariant over a range of distances around the image plane. The final image with diffraction-limited quality is obtained by using digital filtering process from the coded images.Phase mask is a key element in the WFC system and plays a crucial role in terms of imaging quality, capability of extension of the focus depth, and the process of the imaging with the additional possibility of aberration suppressing of the system. In the past of ten years, a variety of phase masks were proposed for the purpose of improving imaging quality, increasing the capability of extension of focus depth and also for the easy fabrication of the phase mask itself, which includes a cubic phase mask[1], a quartic phase mask[5-6], a logarithmic mask [7], an exponential phase mask [8], and a high-order polynomial phase mask[9,10], etc. These different types of phase masks can be classified into two major categories, i.e., rotational symmetric

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Experimental evidence of the theoretical spatial frequency response of cubic phase mask wavefront coding imaging systems

Cited by 12 publications

References 30 publications

Advanced Imaging Optics Utilizing Wavefront Coding

Advanced Imaging Optics Utilizing Wavefront Coding

High-Throughput Nonlinear Optical Microscopy

Comparative study of wavefront coding imaging with rotational and non-rotational symmetric phase masks

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