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Patents

Method and System for Optical Figuring by Imagewise Heating of a Solvent
Michael C. Rushford

U.S. Patent 6,936,182 B2
August 30, 2005
This system provides a method for imagewise etching the surface of a substrate, such as thin glass, in a parallel process. When the substrate surface is placed in contact with an etching solution, the etch rate increases with increasing temperature. Local thermal gradients are then generated individually in different regions of the solution’s boundary layer to imagewise etch the substrate surface in a parallel process. In one configuration, a local heating gradient is produced at selected locations chosen from an indexed array of addresses. A computer processor can then activate each address independently and specify the etching rate for each region. An interferometer can also be included to monitor the system’s progress in real time over the entire surface area and deterministically control the computer processor.

Tapered Laser Rods as a Means of Minimizing the Path Length of Trapped Barrel Mode Rays
Raymond J. Beach, Eric C. Honea, Stephen A. Payne, Ian Mercer, Michael D. Perry
U.S. Patent 6,937,636 B1
August 30, 2005
The maximum trapped path length of a barrel mode can be dramatically reduced by tapering the diameter of a flanged barrel laser rod over its length. This design limits the ability of the trapped spontaneous emission to negatively affect laser performance through amplified spontaneous emission. Laser rods with polished barrels and flanged end caps are being used in diode-array end-pumped laser systems to confine diode-array pump light. In these systems, the pump light can be introduced into one or both ends of the laser rod and ducted down the length of the rod via the total internal reflections that occur when the light strikes the rod’s barrel. However, such rods are susceptible to barrel mode paths that can trap spontaneous emission over long path lengths. If this trapped spontaneous emission is then amplified through stimulated emission, the stored energy available to the desired lasing mode can be effectively depleted, which will affect the laser’s performance. The trapped spontaneous emission can be reduced by introducing a taper onto the laser rod.

Creating Ensembles of Decision Trees through Sampling
Chandrika Kamath, Erick Cantu-Paz
U.S. Patent 6,938,049 B2
August 30, 2005
This system for decision-tree ensembles includes modules to read and sort data, evaluate a potential data split according to some criterion using a random sample of the data, split the data, and combine multiple decision trees in ensembles. The decision-tree method is based on statistical sampling techniques and includes the steps for each module.

Carbon Nanotube Array Based Sensor
Christopher L. Lee, Aleksandr Noy, Stephan P. Swierkowski, Karl A. Fisher, Bruce W. Woods
U.S. Patent 6,946,851 B2
September 20, 2005
This sensor system has an electrode with an array of carbon nanotubes and a second electrode, both of which are positioned with an air gap between them. A measuring device senses changes in electrical capacitance between the first electrode, which has the carbon nanotube array, and second electrode.

High Stroke Pixel for a Deformable Mirror
Robin R. Miles, Alexandros P. Papavasiliou
U.S. Patent 6,947,188 B2
September 20, 2005
This mirror pixel can be fabricated using standard microelectromechanical systems–based methods for a deformable mirror. The pixel is electrostatically actuated and is capable of the high deflections needed for spaced-based mirror applications. In one configuration, the mirror has three layers: a top mirror layer, a middle layer consisting of flexures, and a comb-drive layer. The flexures of the middle layer are attached to the mirror and comb-drive layers, and the comb drives are attached to a frame via spring flexures. Several mirror pixels can be used to construct a large mirror assembly. The actuator for the mirror pixel may be configured as a crenellated beam with one end secure or as a scissor jack. The mirror pixels may be used in various applications requiring high-stroke adaptive optics.

Cylindrical Microlens with an Internally Reflecting Surface and a Method of Fabrication
Raymond J. Beach, Barry L. Freitas
U.S. Patent 6,948,341 B2
September 27, 2005
This high-numerical-aperture cylindrical microlens, which includes an internally reflective surface, will deviate light from its original propagation direction. The fast microlens can be used in optically conditioning laser diodes, laser diode arrays, and laser diode bars.

Biomedical Nuclear and X-Ray Imager Using High-Energy Grazing Incidence Mirrors
Klaus-Peter Ziock, William W. Craig, Bruce Hasegawa, Michael J. Pivovaroff
U.S. Patent 6,949,748 B2
September 27, 2005
This approach for imaging radiation sources located in a subject is being considered for various medical applications. The approach uses grazing-incidence optics to form images of radiopharmaceuticals administered to a subject. These are true-focusing optics; that is, they project a real and inverted image of the radiation source onto a detector possessing spatial and energy resolution.



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UCRL-52000-05-12 | December 14, 2005