Kurt D. Mills

Optical sectioning by holographic coherence imaging: a generalized analysis.

A theory of optical sectioning by image plane holography is developed, emphasizing the use of broad-spectrum holographic methods to enhance the process. It is shown that a broad-spectrum source in a grating interferometer imitates the behavior of a monochromatic broad source.

REALIZATION OF TIME GATING BY USE OF SPATIAL FILTERING

A method for simulating conventional time gating in low-coherence optical imaging processes in highly scattering media is given. The method uses monochromatic instead of broadband light, and spatial filtering is substituted for time gating. The process enables the study of imaging techniques in scattering media to be carried out in an easy and highly controllable way. Experimental results are given.

Optical implementation of code division multiplexing for super resolution. Part I. Spectroscopic method

This paper presents a technique to expand the resolving ability of an imaging system. Orthonormal coding of the input information does the expanding. The paper discusses the spectral coding approach that is applied to each one of the pixels in the input pattern. The paper presents computer simulations as well as experimental results that validate the theory.

Investigation of ultrafast time gating by spatial filtering

With a spatial-filtering method of gating, we explore image formation through scattering media using first-arriving light. Gating times of a few femtoseconds and less are produced, and the resolution at these extremely short gating times is investigated.

Holographic generalized first-arriving light approach for resolving images viewed through a scattering medium.

We present a generalized holography-based approach with improved spatial resolution for extracting images, viewed through a scattering medium. The various angular directions are encoded either with different wavelengths or by capturing their corresponding images in different time slots. The various encoded images are recorded on a digital hologram with a computer. A digital reconstruction, which includes demodulation of the carrier beam and then a proper decoding algorithm, yields resolved images. The principle is demonstrated by recording image-plane digital holograms. Combining the suggested approach with the first-arriving light technique may further improve the results.

Optical implementation of code division multiplexing for super resolution. Part II. Temporal method

In this paper the resolving ability of an imaging system is improved by using temporal orthonormal coding of information. In this technique each one of the spectral-spatial bands of the input is coded with orthonormal temporal codes. The paper presents computer simulations that validate the theory.

Information optics concepts applied to image formation in highly scattering media

We describe a number of methods for imaging into and through highly scattering media, all based in optical imaging processing methods. We describe methods that describe image formation in scattering media in new ways that complement transport theory and other traditional ways.

Electronic channel fringe holography for depth and delay measurements

Electronic spectral holography in the form developed by Shih [Ph.D. dissertation, University Microfilms, Ann Arbor, Mich. (1995)] is adapted to various applications, including optical coherence tomography in scattering media, contouring of surfaces, and optical fiber mode examination.

Generalization of the theory of holographic coherence confocal imaging

The theory of optical sectioning of holographic image plane coherence methods is developed, with emphasis on the use of broad spectrum holographic methods to enhance the process.

Broad-source holographic reconstruction by use of wavelet encoding

Reconstructing a hologram with spatially incoherent illumination smears the obtained image. We propose a wavelet based holographic recording process which uses the smearing to obtain a reconstruction with improved spatial resolution when incoherent illumination is applied.