Patent application number | Description | Published |
20080212629 | Ultra-low heat laser - An ultra-low heat laser that does not rely on florescence cooling. Generally, the inventive laser includes a pump source operable at a pump frequency and a gain medium disposed to receive energy from the source and lase at a frequency close to the pump frequency. In the illustrative embodiment, the laser is a solid state laser having a gain medium which is resonantly pumped to lase at a frequency within 5% of the pump frequency. However, in the best mode and in accordance with the present teachings, the gain medium lases at a frequency within 1% of the pump frequency. In the illustrative embodiment, the laser gain medium ion has a rich Stark energy level structure and the laser active gain medium has oscillator strengths at transitions wavelengths that allow an ultra-low quantum defect operation. The pump source has a wavelength output centered to correspond to a predetermined pump band and an emission band subtended by an absorption bandwidth thereof. | 09-04-2008 |
20090101842 | STANDOFF BIOAGENT-DETECTION APPARATUS AND METHOD USING MULTI-WAVELENGTH DIFFERENTIAL LASER-INDUCED FLUORESCENCE - A standoff bioagent-detection apparatus and method use a direct ultraviolet source to detect bioagents. In some embodiments, a standoff bioagent-detection apparatus and method use laser-induced fluorescence to determine the presence of a biological agent having an aromatic-protein shell, such as Tryptophan. In some embodiments, multi-wavelength differential laser-induced fluorescence helps reduce false alarm caused by naturally occurring interferants. In some embodiments, a full range of ultraviolet wavelengths is initially simultaneously generated to fluoresce Tryptophan to determine if an ambient level is excessive. When the ambient level is excessive, individual ultraviolet wavelengths may be generated in differential pairs and the detected fluorescence levels may be correlated with atmospheric absorption levels for Tryptophan to determine if a bioagent is highly likely to be present. | 04-23-2009 |
20100150191 | Solid-state suspension laser - A solid-state suspension laser. The novel laser includes a gain medium comprised of a plurality of solid-state gain particles suspended in a fluid. The laser also includes a pump source for pumping the gain particles and a resonator for amplifying and outputting laser light generated by the gain medium. In an illustrative embodiment, the gain medium is adapted to flow, and the pumping of the gain medium occurs outside of the resonator. The flow velocities and the densities of the gain particles in the gain medium can be optimized for optimal absorption efficiency during the pumping and/or for optimal extraction efficiency in the resonator as well as for overall laser performance optimization, including power, efficiency and beam quality scalability. | 06-17-2010 |
20110024612 | QUANTUM DOT BASED RADIATION SOURCE AND RADIOMETRIC CALIBRATOR USING THE SAME - In one embodiment, a quantum dot based radiation source includes a housing having a wall defining a cavity therein, a plurality of quantum dots disposed on an inner surface of the wall of the housing, and a radiation excitation source in optical communication with the housing and configured to output radiation to excite the plurality of quantum dots to emit radiation in a desired wavelength range. The quantum dot based radiation source can be used in a calibration system or calibrator, for example to calibrate a detector. | 02-03-2011 |
20110206084 | LASER BASED ON QUANTUM DOT ACTIVATED MEDIA - A laser gain medium and laser system include a host material, a plurality of quantum dots dispersed throughout the host material, and a plurality of laser active ions surrounding each of the quantum dots. The laser active ions are disposed in close proximity to the quantum dots such that energy absorbed by the quantum dots is transferred to the ions, thereby exciting the ions to produce laser output. In an illustrative embodiment, each quantum dot is surrounded by an external shell doped with the laser active ions. | 08-25-2011 |
20120111148 | Forming Spherical Semiconductive Nanoparticles - In certain embodiments, a material comprising one or more semiconductive substances is vaporized to generate a vapor phase condensate. The vapor phase condensate is allowed to form nanoparticles. The nanoparticles are annealed to yield substantially spherical nanoparticles. | 05-10-2012 |
20140314210 | X-RAY CELLS AND OTHER COMPONENTS HAVING GAS CELLS WITH THERMALLY-INDUCED DENSITY GRADIENTS - A method includes creating a gas flow in a gas cell and cooling a portion of the gas flow to create a thermally-induced temperature gradient in the gas flow. The method also includes directing at least one laser beam through at least a portion of the gas flow with the thermally-induced temperature gradient. The gas flow can be directed axially along a length of the gas cell or transverse to the length of the gas cell, and the at least one laser beam can be directed axially along the length of the gas cell through at least the portion of the gas flow. The gas flow may represent a first gas flow, and the method may further include creating a second gas flow in the gas cell and cooling a portion of the second gas flow to create a thermally-induced temperature gradient in the second gas flow. | 10-23-2014 |
20140322373 | FORMING SPHERICAL SEMICONDUCTIVE NANOPARTICLES - In certain embodiments, a material comprising one or more semiconductive substances is vaporized to generate a vapor phase condensate. The vapor phase condensate is allowed to form nanoparticles. The nanoparticles are annealed to yield substantially spherical nanoparticles. | 10-30-2014 |