Bryngdahl Olof

Bio: Bryngdahl Olof is an academic researcher from Xerox. The author has contributed to research in topics: Image plane & Holography. The author has an hindex of 2, co-authored 2 publications receiving 330 citations.

Geometrical transformations in optics

Abstract: Geometrical image modifications such as coordinate transformations and local translation, inversion, reflection, stretching which require space-variant optical coherent systems are provided by introducing phase filters having a predetermined phase function into optical coherent systems in such a manner that the local phase variations influence light from local object areas. In one embodiment, the object distribution is multiplied by the phase function so that its spectrum at the frequency plane constitutes the desired transformation. In a second embodiment, the aforementioned concept is applied to produce a transformation in an image plane. The phase filters, in a preferred embodiment, comprise computer generated holograms.

Method of storing optical information on a random carrier

Abstract: The present invention relates to the storage of optical information on a random or pseudo-random carrier. Such a carrier is comprised of a pseudo-random distribution of pulses, which distribution is modulated in accordance with the intensity distribution from an illuminated object. Provided that the spatial variation in the pulse parameters is at least on the order of the wavelength of light, a microstructure of the original object is formed which is coded with intensity information from the object. A recording of the microstructure may be made. By illuminating this recording with coherent light, the information stored thereon may be processed for reconstructing an image of the original object or extracting information from the recording.

Orbital angular momentum: origins, behavior and applications

Abstract: As they travel through space, some light beams rotate. Such light beams have angular momentum. There are two particularly important ways in which a light beam can rotate: if every polarization vector rotates, the light has spin; if the phase structure rotates, the light has orbital angular momentum (OAM), which can be many times greater than the spin. Only in the past 20 years has it been realized that beams carrying OAM, which have an optical vortex along the axis, can be easily made in the laboratory. These light beams are able to spin microscopic objects, give rise to rotational frequency shifts, create new forms of imaging systems, and behave within nonlinear material to give new insights into quantum optics.

Position, rotation, and scale invariant optical correlation

Abstract: A new optical transformation that combines geometrical coordinate transformations with the conventional optical Fourier transform is described. The resultant transformations are invariant to both scale and rotational changes in the input object or function. Extensions of these operations to optical pattern recognition and initial experimental demonstrations are also presented.

Efficient separation of the orbital angular momentum eigenstates of light

Abstract: The orbital angular momentum of photons has the potential to dramatically increase data rates and enhance security in quantum optical communications. Here, Mirhosseini et al. demonstrate a scheme that is able to separate photons with different orbital angular momentum with 92% efficiency.

Application of the Wigner distribution function to partially coherent light

Abstract: The paper presents a review of the Wigner distribution function (WDF) and of some of its applications to optical problems, especially in the field of partial coherence. The WDF describes a signal in space and in spatial frequency simultaneously and can be considered the local spatial-frequency spectrum of the signal. Although derived in terms of Fourier optics, the description of an optical signal by means of its WDF closely resembles the ray concept in geometrical optics; the WDF thus presents a link between partial coherence and radiometry. Properties of the WDF and its propagation through linear optical systems are considered; again, the description of systems by WDF’s can be interpreted directly in geometric-optical terms. Some examples are included to show how the WDF can be applied to practical problems that arise in the field of partial coherence.