Biomedical subjects

Daniela Dragoman

Publications and source records attributed to Daniela Dragoman.

5 recordsLinked to original sources

PubMed2003

Correlation-based phase space beam characterization.

A generalized correlation-based definition for moments of arbitrary order is introduced that can also accommodate mixed spatial and angular moment. Moreover, a transformation law forthese moments for propagation through linear optical systems is derived. This law has the same form as the corresponding propagation law of the moments defined in terms of the Wigner distribution function. The correlation-based moments can be used to fully characterize beams of arbitrary states of coherence.

Journal Article↗

PubMed2003

Redundancy of phase-space distribution functions in complex field recovery problems.

Shows that the amplitude and phase of an optical field can be recovered from only a section of phase-space distribution functions, the information contained in other sections being redundant. Experimental implications of this result are discussed, and a physical interpretation of it is offered. In particular the sampling problem in tomography is solved for any field distribution.

Journal Article↗

PubMed2003

Biased micromechanical cantilever arrays as optical image memory.

We show that an array of optically actuated biased cantilevers can work as an optical data storage, able to encode data stored as arrays of optical pixels (images). Each of these optical pixels can, in addition, have a predetermined pixel depth, expressed as a certain number of gray levels. This new optical memory is able to work at a data rate of approximately 7 GB/s for an image with 128 x 128 pixels.

Journal Article↗

PubMed2003

Unambiguous coherence retrieval from intensity measurements.

It is demonstrated that the members of different classes of two-dimensional fields that have the same intensity distributions everywhere in free space but different coherence properties can be identified by measuring the fields' intensities after passing the fields through an anamorphic optical system, such as a cylindrical lens. In this way the ambiguity in coherence determination from intensity measurements alone, present for the case of two-dimensional fields, is removed.

Journal Article↗

PubMed2002

Amplitude and phase recovery of rotationally symmetric beams.

Two methods are presented for the amplitude and phase recovery of optical beams with rotational symmetry. These are the tomographic method based on the ambiguity function and the one-step wavefront recovery based on the measurement of a phase-space distribution closely related to the Wigner distribution function. The results obtained from these two methods are compared, and the appropriateness of using either one of them for specific situations is discussed.

Journal Article↗