| Patent application number | Description | Published |
|---|
| 20080279231 | Optical limiter - An optical power limiter comprises an input optical transmission element, an output optical transmission element, and a power-limiting element disposed between the input and output elements for transmitting optical signals from the input element to the output element. The power-limiting element comprises an optical-limiting solid mixture containing particles of at least one material that produces reversible thermal changes in response to light above a predetermined optical power level, thereby changing the optical transmission properties of the power-limiting element. | 11-13-2008 |
| 20090073053 | OPTICALLY DRIVEN ANTENNA - There is provided an optically driven, transmitting and receiving antenna transformable into an electrically invisible antenna when inactive, including a light source, a semiconductor wafer illuminatable by the light source and a microwave source or sensor. The wafer has a surface for forming optically induced plasma or electron hole concentration, assuming a spatial and temporal pattern defined by a light beam impinging thereon. Upon the wafer being exposed to the light beam having a power level sufficient for creating a dense plasma or electron hole concentration in the wafer, the wafer becomes reflective to microwaves, and returns to transparency when light from the light source is turned off. | 03-19-2009 |
| 20090122298 | Optical Screen, Systems and Methods For Producing and Operating Same - There is provided a system for forming an optical screen, including a continuous wave or pulsed laser transmitter for transmitting a beam of radiation at a predetermined wavelength and forming a planar or curved surface to be traversed by a moving object, at least one receiver including an array of detectors for receiving reflected or scattered beam radiation from the object and directing it towards the detectors for producing a signal, and a detection logic receiving the signal and determining parameters selected from the group of spatial position, velocity and direction of propulsion of the moving object. A method for detecting a moving object is also provided. | 05-14-2009 |
| 20090207478 | Optical power limiting and switching combined device and a method for protecting imaging and non-imaging sensors - An optical power limiting and switching device comprises at least one plate made of transparent dielectric material, and a thin limiting solid mixture coated on one side of the plate. Upon being exposed to an optical power beam having a power level exceeding a predetermined limit power, the layer of solid mixture limits the power transmission by scattering out part of the impinging energy. When the power increases to the damage threshold, the solid mixture forms a plasma or catastrophic breakdown, damaging the solid mixture material and thereby rendering the portion of the plate surface under the impinging beam opaque to light. | 08-20-2009 |
| 20090304040 | DIODE-PUMPED CAVITY - A side-pumped, diode-pumped solid-state laser cavity includes a conductively cooled housing having an opening O for pump radiation from a diode array in close proximity to a laser rod. The pump light is absorbed by the rod and excites the laser ions. The cavity includes a thin, diffuse reflector encircling the rod, having a shaped opening for the collection and redirection of the pump light into the rod, and a good heat conductor as the heat sink and heat conductor. A split heat sink inhibits the flow of heat from the pump diodes into the laser rod, and pre-formed air spacings are designed to provide uniform temperature distribution around the laser rod. | 12-10-2009 |
| 20100061680 | RESETTABLE OPTICAL FUSE - A resettable optical energy switching device comprises a waveguide forming an optical path between an input end and an output end, and an optical energy diverting material located in said optical path for diverting optical energy propagation away from said output end when said optical energy exceeds a predetermined threshold. The optical energy diverting material does not divert optical energy propagation away from the output end when the optical energy propagation drops below the predetermined threshold, and thus propagation of optical energy to the output end is automatically resumed when the optical energy drops below the predetermined threshold. In one implementation, the optical energy diverting material comprises a light-absorbing material having an index of refraction that decreases as light is absorbed by the material. | 03-11-2010 |
| 20100084383 | METHOD FOR LASER INDUCED FUSION PIGTAILING OF OPTICAL FIBER TO OPTICAL WAVEGUIDE - A method for instant splicing of an optical fiber to an optical waveguide or bulk material comprises forming a nanometric conductive layer at the interface between the optical fiber and the optical waveguide or bulk material to be spliced, and applying laser radiation to the interface through the fiber optical internally or through the bulk material externally, to produce an arc discharge due to the laser light electric field. The arc discharge melts and diffuses the conductive layer to produce a permanent splice having a low optical loss. | 04-08-2010 |
| 20100145417 | LICE EXTERMINATION SYSTEM AND METHOD - Apparatus is provided for treating an infested area ( | 06-10-2010 |
| 20100166368 | GRATING LIKE OPTICAL LIMITER - A reversible optical energy limiting device comprises a waveguide forming an optical path between an input end and an output end, and an optical energy responsive material located in the optical path for reflecting at least a portion of optical energy received from the input end back toward the input end when the optical energy exceeds a predetermined threshold. The optical energy responsive material does not reflect optical energy when it drops below the predetermined threshold, and thus propagation of optical energy from the input end to the output end is automatically resumed when the optical energy drops below the predetermined threshold. The optical energy responsive material may extend across the optical path an acute angle relative to the longitudinal axis of the optical path so that back-reflected light does not re-enter the optical system. | 07-01-2010 |
| 20110051231 | LIGHT EXCITED LIMITING WINDOW - An optical power limiter comprises an input optical transmission element, an output optical transmission element, and a power-limiting element disposed between the input and output elements for transmitting optical signals from the input element to the output element. The power-limiting element comprises an optical-limiting solid mixture containing particles of at least one material that produces reversible thermal changes in response to light above a predetermined optical power level, thereby changing the optical transmission properties of the power-limiting element. | 03-03-2011 |
| 20110164240 | SEA CLUTTER IDENTIFICATION WITH A LASER SENSOR FOR DETECTING A DISTANT SEABORNE TARGET - There is provided a system for detecting distant seaborne objects by an airborne vehicle, including a seeker head having an axis in the direction of flight, a sensor mounted on the seeker's head, the sensor being operative to transmit towards the sea surface a laser radiation beam of selected wavelength and to receive from the sea water surface radiation reflected from the sea water surface and from a seaborne object, and a computing unit for differentiating between the reflection received from the sea water surface and from the seaborne object. A method for detecting distant seaborne objects by an airborne vehicle is also provided. | 07-07-2011 |
