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Ren Y.,University of Southern California | Huang H.,University of Southern California | Xie G.,University of Southern California | Ahmed N.,University of Southern California | And 10 more authors.
CLEO: Science and Innovations, CLEO_SI 2013 | Year: 2013

Turbulence-induced crosstalk and system penalty for an OAM-multiplexed free space optical communication link is experimentally investigated. The power penalty is found to exceed 10 dB in weak turbulence condition due to severe crosstalk. © 2013 Optical Society of America.


Rodenburg B.,University of Rochester | Malik M.,University of Rochester | O'Sullivan M.,University of Rochester | Mirhosseini M.,University of Rochester | And 4 more authors.
Optics InfoBase Conference Papers | Year: 2012

The effects of thick turbulence on transverse modes of light carrying orbital angular momentum are studied theoretically and experimentally. These results have potentially important implications for free-space quantum communications systems. © 2011 Optical Society of America.


Oesch D.W.,SAIC | Sanchez D.J.,Air Force Research Lab | Gallegos A.L.,SAIC | Holzman J.M.,Air Force Research Lab | And 5 more authors.
Optics InfoBase Conference Papers | Year: 2013

We demonstrate initial results of small scale temporal variability in the photonic orbital angular momentum of an optical beam transferred through the interaction with distributed volume turbulence. © OSA 2013.


Oesch D.W.,SAIC | Sanchez D.J.,Air Force Research Lab | Gallegos A.L.,SAIC | Holzman J.M.,Air Force Research Lab | And 5 more authors.
Optics InfoBase Conference Papers | Year: 2013

We demonstrate the use of optical vortex trails in the identification of photonic orbital angular momentum in wave front sensor measurements of beams propagating through distributed volume turbulence. © OSA 2013.


Brennan T.J.,The Optical science Company
Optics InfoBase Conference Papers | Year: 2013

Methods for extracting important statistical parameters of turbulence and assessing Kolmogorov behavior will be discussed and illustrated with field data from the SOR Turbulence Sensor (SORTS). © 2013 Optical Society of America.


Grant
Agency: National Science Foundation | Branch: | Program: SBIR | Phase: Phase I | Award Amount: 99.94K | Year: 2009

This Small Business Innovative Research (SBIR) Phase I project provides a significant advancement of the state of the art in fast, high-precision calibration and control of deformable mirrors for adaptive optics (AO)applications. This is accomplished by the development of a detailed nonlinear model of deformable mirror performance and fast solvers for the differential equations that describe the situation. Inverse techniques are utilized in the calibration process and fast solvers are used in the control. This approach provides enhanced performance over conventional approaches which assume that the deformable mirror is linear and only approximately solves the differential equations involved in two important ways. The first is that convergence in closed loop operation will be accelerated and the second is that accurate open loop control is available. The two major results of the proposed effort, accurate calibration and high-precision control of deformable mirrors, will be demonstrated by using the appropriate level of analysis and simulation. The team will concentrate in applying these advances to extra solar planet detection. The commercial impact of this work will be significant as it will facilitate the application of AO technology to areas that are unavailable today such as laser communications, biomedical imaging, consumer electronics, surveillance, and solar energy. Although the purpose of the proposed work is to bring this capability to market the scientific merits of this work are significant in their own right. Since this effort develops fast solvers to differential equations and solving an inverse problem that leads to the practical calibration and control of hardware there is little doubt these techniques have scientific merit and will be useful in these areas. This award is funded under the American Recovery and Reinvestment Act of 2009 (Public Law 111-5).


PubMed | The Optical science Company
Type: Journal Article | Journal: Journal of the Optical Society of America. A, Optics, image science, and vision | Year: 2012

This work addresses the physical basis of the measurement process for object-based phasing of an array of telescopes. In this regard an enhanced least-squares estimator that is capable of differentiating among three families of array aberrations in an object-based phasing system is developed. In a system of this nature the system to be phased illuminates the object of interest and the return radiation is detected. Telescope aberrations, atmospheric aberrations, and speckle-induced aberrations are all reported by the estimator to facilitate correction of telescope and atmospheric aberrations. This is accomplished by proper handling of the unobservable modes and recognizing that the five global aberrations-telescope array piston, atmospheric array piston and tilt, and speckle array piston and tilt-cannot be measured accurately so they need to be projected out of the estimated piston commands. Except for these relatively benign array aberrations, the disturbances for all three families of array aberrations are estimated exactly. An interesting feature of the speckle array aberrations is that a synthetic aperture is developed that is almost twice as large as the array of telescopes under consideration.

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