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Reduction of Damage Initiation Density in Fused Silica Optics Via UV Laser Conditioning
John E. Peterson, Stephen M. Maricle, Raymond M. Brusasco, Bernardino M. Penetrante
U.S. Patent 6,705,125 B2
March 16, 2004
This invention provides a method for reducing the density of sites on the surface of fused silica optics that are prone to laser-induced damage. As a result, optics have far fewer catastrophic defects and can better resist optical deterioration when exposed for a long time period to a high-power laser beam with a wavelength of about 360 nanometers or less. The initiation of laser-induced damage is reduced by conditioning the optic at fluences below those levels that normally lead to catastrophic growth or damage. When the optic is then irradiated at its high fluence design limit, the concentration of catastrophic damage sites that form on the optic surface is greatly reduced.

Cylindrical Microlens with an Internally Reflecting Surface and a Method of Fabrication
Raymond J. Beach, Barry L. Freitas
U.S. Patent 6,710,926 B2
March 23, 2004
A fast (high-numerical-aperture) cylindrical microlens, which includes an internally reflective surface, deviates the direction of the light entering the lens from its original propagation direction. This microlens is used in optically conditioning laser diodes, laser-diode arrays, and laser-diode bars.

System and Method for Characterizing Voiced Excitations of Speech and Acoustic Signals, Removing Acoustic Noise from Speech, and Synthesizing Speech
Greg C. Burnett, John F. Holzrichter, Lawrence C. Ng
U.S. Patent 6,711,539 B2
March 23, 2004
This invention is a system and method for characterizing human (or animate) speech voiced excitation functions and acoustic signals, for removing unwanted acoustic noise that often occurs when a speaker uses a microphone in common environments, and for synthesizing personalized or modified human (or other animate) speech on command from a controller. A low-power electromagnetic (EM) sensor is used to detect the motions of windpipe tissues in the glottal region of the human speech system before, during, and after voiced speech is produced by a user. A voiced excitation function can be derived from these tissue motion measurements. The excitation function also provides speech production information to enhance noise removal from human speech, and it enables accurate transfer functions of speech to be obtained. Previously stored excitation and transfer functions can be used for synthesizing personalized or modified human speech. Configurations of EM sensor and acoustic microphone systems are described to enhance noise cancellation and to enable multiple articulator measurements.

Inorganic Metal Oxide/Organic Polymer Nanocomposites and Method Thereof
Alexander E. Gash, Joe H. Satcher, Randy Simpson
U.S. Patent 6,712,917 B2
March 30, 2004
This synthetic method for preparing hybrid inorganic and organic energetic nanocomposites uses stable metal inorganic salts, organic solvents, and an organic polymer with good solubility to produce novel nanocomposite energetic materials. Fuel metal powders, particularly those that are oxophillic, can also be added to the composition. These materials have been characterized by thermal methods, energy-filtered transmission electron microscopy, adsorption and desorption methods, and Fourier-transform infrared spectroscopy. The characterization results indicate that the organic polymer phase fills the nanopores of the composite material, providing superb mixing of the component phases in the energetic nanocomposite.

Microchannel Cross Load Array with Dense Parallel Input
Stefan P. Swierkowski
U.S. Patent 6,716,328 B1
April 6, 2004
An architecture or layout for microchannel arrays uses T or cross (+) loading for electrophoresis or other injection and separation chemistry performed in microfluidic configurations. This architecture enables a dense layout of arrays of functionally identical shaped channels, and it solves the problem of simultaneously enabling efficient parallel shapes and biasing of the input wells, waste wells, and bias wells at the input end of the separation columns. One T-load architecture uses circular holes with common rows, but not columns, so the flow paths for each channel are identical in shape, using multiple mirror image pieces. Another Tload architecture enables the access hole array to be formed on a biaxial, collinear grid suitable for electrical discharge micromachining (square holes) with common rows and columns.

Programmable Phase Plate for Tool Modification in Laser Machining Applications
Charles A. Thompson, Jr., Michael W. Kartz, James M. Brase, Deanna Pennington, Michael D. Perry
U.S. Patent 6,717,104 B2
April 6, 2004
This system for laser machining includes a laser source for propagating a laser beam toward a target location and a spatial light modulator with individual controllable elements. The system can thus modify a phase profile of the laser beam to produce a corresponding irradiance pattern on the target location. The system also includes a controller, operably connected to the spatial light modulator, for manipulating the individual controllable elements. When these elements are controlled, the phase profile of the laser beam may be modified as desired to produce a corresponding irradiance pattern on the target location, thus allowing a machining operation to be performed on the target location.

Fibers and Fabrics with Insulating, Water-Proofing, and Flame-Resistant Properties
Lawrence W. Hrubesh, John F. Poco, Paul R. Coronado
U.S. Patent 6,723,378 B2
April 20, 2004
Fibers and fabrics produced from the fibers are made water repellent, fire retardant, or thermally insulating by filling void spaces in the fibers or fabrics with a powdered material. When the powder is sufficiently finely divided, it clings tenaciously to the fabric’s fiber and to itself, resisting the tendency to be removed from the fabric.

Femtosecond Laser-Electron X-Ray Source
Frederic V. Hartemann, Hector A. Baldis, Chris P. J. Barty, David J. Gibson, Bernhard Rupp
U.S. Patent 6,724,782 B2
April 20, 2004
This femtosecond laser-electron x-ray source includes a high-intracavity-power, mode-locked laser and an x-ray optics system. A high-brightness relativistic electron injector produces an electron-beam pulse train. A system then accelerates the pulse train.

Ultrashort-Pulse Laser Machining System Employing a Parametric Amplifier
Michael D. Perry
U.S. Patent 6,728,273 B2
April 27, 2004
A method and apparatus are provided for increasing the energy of chirped laser pulses to an output ranging from 0.001 to more than 10 millijoules at a repetition rate of 0.010 to 100 kilohertz. A two-stage optical parametric amplifier is used with a bulk nonlinear crystal so the pump and signal beam size can be independently adjusted in each stage.

Three Dimensional Separation Trap Based on Dielectrophoresis and Use Thereof
Raymond P. Mariella, Jr.
U.S. Patent 6,730,204 B2
May 4, 2004
An apparatus is adapted to separate target materials from other materials in a flow that contains both. A dielectrophoretic trap with at least one electrode system is adapted to receive the materials. The electrode system has a three-dimensional configuration that includes a first and second electrode. The two electrodes are shaped and positioned so that an electrical voltage applied to them creates a dielectrophoretic force that does not reach zero between the two electrodes.

Magnetohydrodynamic (MHD) Driven Droplet Mixer
Abraham P. Lee, Asuncion V. Lemoff, Robin R. Miles
U.S. Patent 6,733,172 B2
May 11, 2004
A magnetohydrodynamic fluidic system with three substrate sections mixes two substances. Each substrate section includes a flow channel with a plurality of pairs of spaced electrodes connected to it. A magnetic section and a control section are then connected to the spaced electrodes. The mixer moves two substances—one through the first flow channel and another through the second flow channel—into the third flow channel, where they are mixed.

Stable Glow Discharge Detector
Jackson C. Koo, Conrad M. Yu
U.S. Patent 6,736,000 B2
May 18, 2004
A highly sensitive electronic ion cell uses glow discharge to measure trace elements in a helium carrier gas. A constant wave stable glow discharge detector, which is controlled through a biased resistor, can detect the change of electron density caused by impurities in the helium carrier gas by many orders of magnitude larger than that caused by direct ionization or electron capture. The detector uses a floating pseudo-electrode to form a probe in or near the plasma and a solid rod electrode. This probe directly measures the large variation of electron density due to trace amounts of impurities. The solid rod electrode provides greater stability and thus easier alignment.

Wireless, Relative-Motion Computer Input Device
John F. Holzrichter, Erwin T. Rosenbury
U.S. Patent 6,738,044 B2
May 18, 2004
This invention provides a system for controlling a computer display in a workspace using an input unit and output unit. Electromagnetic (EM) waves are sent to flood the workspace and are reflected from the input and output units. A relative-distance-moved information signal is created using the reflected EM waves. Algorithms convert this signal to a display signal, which controls the computer display.


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UCRL-52000-04-7/8 | July 12, 2004