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Kai-Ming Feng - Milpitas CA Jin-Xing Cai - Ocean NJ Alan E. Willner - Los Angeles CA Victor Grubsky - Los Angeles CA Dmitry Starodubov - Los Angeles CA Jack Feinberg - Manhattan Beach CA
Assignee:
University of Southern California - Los Angeles CA
International Classification:
G02B 634
US Classification:
385 37, 385 24, 359130
Abstract:
Techniques and devices based on a wave-guiding element which has a spatial grating pattern that is an oscillatory variation along its optic axis. The wave-guiding element is configured to receive an input optical signal and to produce an output optical signal by reflection within a Bragg reflection band produced by the spatial grating pattern so as to produce time delays of different reflected spectral components as a nonlinear function of spatial positions along said optic axis at which the different reflected spectral components are respectively reflected. Such a wave-guiding element may be a nonlinearly chirped fiber grating A control unit may be engaged to the wave-guiding element and is operable to change a property of the spatial grating pattern along the optic axis to tune at least relative time delays of the different reflected spectral components nonlinearly with respect to wavelength.
Dana Z. Anderson - Boulder CO Jack L. Feinberg - Manhattan Beach CA
International Classification:
G03H 102 G02B 2700
US Classification:
350 364
Abstract:
Changes in an image are detectable by a tracking novelty filter while an incorporated holographic medium is in disequilibrium. A suitably doped single-domain barium titanate crystal can serve as the holographic medium. Image information is imposed on a laser beam in the form of a spatially varying polarization across the beam cross section spatial position. The modulated beam is directed to the crystal, which cooperates with a polarizing beam splitter and a half wave plate to define a polarization conjugator. The conjugated beam is passed through the modulator a second time and then operated on by a beam splitter. When the crystal is in equilibrium with the incident laser light, the beam splitter directs minimal light to a detector. However, when an image change causes a change in the applied modulation, the changed image elements are intensified at the detector while the holographic medium is in disequilibrium. In alternative embodiments, phase is the variable modulated.
Near-Ultra-Violet Formation Of Refractive-Index Grating Using Reflective Phase Mask
Dmitry S. Starodubov - Moscow, RU Jack L. Feinberg - Manhattan Beach CA
Assignee:
D-STAR Technologies, LLC - Los Angeles CA
International Classification:
G02B 634
US Classification:
385 37
Abstract:
A grating is induced in the core of a hydrogen-loaded high-germanium-content optical fiber using near-UV (275 nm-390 nm) laser light. An interference pattern is generated at the core using a molded polymer phase mask with a square wave surface relief pattern. The light is directed through the phase mask, through a protective fiber coating, through the cladding, and into the core. The phase mask generates an interference pattern with a period half that of the surface relief pattern. Index of refraction changes occur at the bright fringes of the interference pattern--thus creating the grating. Advantages over existing mid-UV technology include lower fabrication costs for phase masks, simplified grating induction since fiber coatings do not need to be removed, and reduced infrared absorption caused by grating formation in the fiber.
Mark D. Ewbank - Newbury Park CA Jack Feinberg - Manhattan Beach CA Mohsen Khoshnevisan - Newbury Park CA Pochi A. Yeh - Thousand Oaks CA
Assignee:
Rockwell International Corporation - El Segundo CA
International Classification:
H01S 3098
US Classification:
372 18
Abstract:
Laser energy is combined using dynamic beam splitters that can automatically accommodate changes in the laser cavity mode structure. Nonlinear optical methods and real time holography are employed to achieve phase locking among multiple lasers. A single laser output beam can be produced from a multitude of laser cavities which collectively contribute to the output power. No outside monitoring and servo mechanisms are required, since nonlinear optical processes automatically perform the functions of both monitoring and control. A coupled laser system includes two or more lasers, each laser having a resonant cavity, a laser gain medium in the resonant cavity, and a nonlinear optical element. Each nonlinear optical element is positioned in its respective resonant cavity to diffract laser energy from the cavity to a coupling beam by means of four-wave mixing (phase conjugation). Each cavity is coupled to another resonant cavity within the system by the coupling beams such that nonlinear optical interactions phase lock the outputs of all the lasers.
University of Southern California - Los Angeles CA
International Classification:
H01S 3098 H01S 323 H01S 330
US Classification:
332 751
Abstract:
An apparatus and method of producing a phase conjugate replica of a light beam involves internal reflection of the beam within a body of mixing material which lacks inversion symmetry. The orientation of the body relative to the incoming beam is adjusted such that at least one auxiliary beam splits off from the incoming beam, is internally reflected at least twice by the surface of the material and returns to the incoming beam within the material for scattering as an oppositely directed phase conjugate replica thereof.
Kai-Ming Feng - Alhambra CA Jin-Xing Cai - Los Angeles CA Alan Eli Willner - Los Angeles CA Victor Grubsky - Los Angeles CA Dmtry Starodubov - Los Angeles CA Jack Feinberg - Manhattan Beach CA
Assignee:
University of Southern California - Los Angeles CA
International Classification:
G02B 634
US Classification:
385 37
Abstract:
A nonlinearly chirped fiber grating for achieving tunable dispersion compensation, chirp reduction in directly modulated diode lasers, and optical pulse manipulation. A dynamical dispersion compensation mechanism can be implemented in a fiber communication system based on such a nonlinearly chirped fiber grating.
Hybrid Laser Power Combining And Beam Cleanup System Using Nonlinear And Adaptive Optical Wavefront Compensation
Marvin B. Klein - Pacific Palisades CA David M. Pepper - Malibu CA Ronald R. Stephens - Westlake Village CA Thomas R. O'Meara - Malibu CA David Welch - Menlo Park CA Robert J. Lang - Pleasanton CA Jack L. Feinberg - Manhattan Beach CA Stuart MacCormack - Venice CA
Assignee:
Hughes Electronics - Los Angeles CA SDL, Inc. - San Jose CA
International Classification:
H01S 300 G02B 626
US Classification:
359334
Abstract:
An optical amplification system directs a diffraction-limited signal beam through a series of approximately 90. degree. crossings with a number of non-diffraction-limited pump beams in a photorefractive medium. All of the beams are s-polarized, resulting in an energy transfer from the pumps to the signal beam while leaving the signal beam diffraction-limited. The photorefractive medium is preferably a series of BaTiO. sub. 3 :Rh crystals that receive the pump and signal beams through orthogonal faces, with their C-axes at approximately 45. degree. to both beams. A binary tree optical distribution network is used to minimize waveguide splits in forming a large number of pump beams. The outputs of several amplification modules are combined into a single output beam using adaptive optics, with the outputs from the different modules phase matched to each other by diverting two minor portions of the combined beam, partially overlapping the diverted beams and adjusting the amplification module phases to cancel phase differentials between the overlapped portions. Similarly, sets of combined and phase-matched beams can be combined with each other (again using adaptive optics) to generate still higher powers using a super module approach.
"It's not typical that someone taking LSD would pound on windows or chase people," said Jack Feinberg of the nonprofit Phoenix Houses of Florida, who isn't involved in the case. "The aggressiveness part is something that is just completely foreign. But, of course, drugs are unpredictable, especially
Date: Oct 09, 2012
Category: U.S.
Source: Google
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