Patent application number | Description | Published |
20150051517 | COORDINATE TRANSFORMATION OF GRAPHICAL OBJECTS REGISTERED TO A MAGNETIC RESONANCE IMAGE - A method of using a medical instrument (300, 400) comprising a magnetic resonance imaging (MRI) system (302). The MRI system acquires (100, 202) first magnetic resonance data (342) and reconstructs (102, 204) a first magnetic resonance image (344, 502). A registration (352) of multiple graphical objects (346, 510, 512) to the first magnetic resonance image is received which defines spatial positions of the multiple graphical objects in the first magnetic resonance image. The method further comprises repeatedly: acquiring (106, 210) second magnetic resonance data (354); reconstructing (108, 212) a second magnetic resonance image (356, 502′); receiving (110, 214) repositioning coordinates (358, 700) in the second magnetic resonance image for a first group (348, 510) selected from the multiple graphical objects; and determining (112, 216) a coordinate transformation (359, 702) of a second group (350, 512) selected from the multiple graphical objects by applying a coordinate transformation model (364) to the repositioning coordinates. | 02-19-2015 |
20150073261 | MODIFICATION OF A TREATMENT PLAN USING MAGNETIC RESONANCE DATA ACQUIRED DURING A COOLING PERIOD - A medical apparatus ( | 03-12-2015 |
20150224341 | MAGNETIC RESONANCE GUIDED LINAC - The invention provides for a medical instrument ( | 08-13-2015 |
Patent application number | Description | Published |
20090285542 | SILICA-ON-SILICON WAVEGUIDES AND RELATED FABRICATION METHODS - True time delay silica waveguides and related fabrication methods are disclosed. Also disclosed are true time delay silica waveguides comprising wedged silica structures. | 11-19-2009 |
20120320448 | CHIP-BASED FREQUENCY COMB GENERATOR WITH MICROWAVE REPETITION RATE - A frequency comb generator fabricated on a chip with elimination of a disadvantageous reflow process, includes an ultra-high Q disk resonator having a waveguide that is a part of a wedge structure fabricated from a silicon dioxide layer of the chip. The disk resonator allows generation of a frequency comb with a mode spacing as low as 2.6 GHz and up to 220 GHz. A surface-loss-limited behavior of the disk resonator decouples a strong dependence of pumping threshold on repetition rate. | 12-20-2012 |
20120321245 | SILICA-ON-SILICON WAVEGUIDES AND RELATED FABRICATION METHODS - A method of manufacturing a waveguide eliminates a prior art reflow step and introduces certain new steps that permit fabricating of an ultra-low loss waveguide element on a silicon chip. The ultra-low loss waveguide element may be adapted to fabricate a number of devices, including a wedge resonator and a ultra-low loss optical delay line having an extended waveguide length. | 12-20-2012 |
20140105232 | ON-CHIP OPTICAL REFERENCE CAVITY EXHIBITING REDUCED RESONANCE CENTER FREQUENCY FLUCTUATIONS - An optical apparatus comprises a waveguide substrate and an optical reference cavity. The optical reference cavity comprises an optical waveguide formed on the waveguide substrate and arranged to form a closed loop greater than or about equal to 10 cm in length. The RMS resonance frequency fluctuation is less than or about equal to 100 Hz. The Q-factor can be greater than or about equal to 10 | 04-17-2014 |
20140192830 | WAVELENGTH LOCKING OF A LASER DEVICE - There is discussed an optical system comprising a laser device that outputs a divergent light beam. A first portion of the divergent light beam, including a central portion, passes through an etalon device, which acts as a wavelength discriminator, and then the central portion is incident on a first monitor photodiode, which generates a wavelength-dependent detection signal. A second portion of the divergent light beam is incident on a second monitor photodetector, without passing through the etalon device, to generate a wavelength-independent detection signal. A processor processes the wavelength-dependent detection signal and the wavelength-independent detection signal to determine a control signal for controlling the wavelength of the laser device. By accurately positioning a photodetector at the central fringe of the divergent light beam following transmission through the etalon device, a compact and cost-effective wavelength locking arrangement is provided. | 07-10-2014 |
20140270788 | METHOD OF FABRICATING AND OPERATING AN OPTICAL MODULATOR - A method of making an optical modulator by determining the material composition of the quantum well region in the waveguide portion of the modulator so that the modulator is transparent at a gain peak wavelength that is greater than the predetermined wavelength by a predetermined amount, and fabricating the modulator with the determined material composition. | 09-18-2014 |
20150029579 | CHIP-BASED FREQUENCY COMB GENERATOR WITH MICROWAVE REPETITION RATE - A frequency comb generator fabricated on a chip with elimination of a disadvantageous reflow process, includes an ultra-high Q disk resonator having a waveguide that is a part of a wedge structure fabricated from a silicon dioxide layer of the chip. The disk resonator allows generation of a frequency comb with a mode spacing as low as 2.6 GHz and up to 220 GHz. A surface-loss-limited behavior of the disk resonator decouples a strong dependence of pumping threshold on repetition rate. | 01-29-2015 |
20150092808 | CHIP-BASED LASER RESONATOR DEVICE FOR HIGHLY COHERENT LASER GENERATION - A highly-coherent chip-based laser generating system includes a disk resonator incorporating a wedge structure fabricated from a silicon dioxide layer of a chip. The disk resonator is operable to generate a highly-coherent laser from a low-coherence optical pump input provided at an optical power level as low as 60 μW. The disk resonator is fabricated with sub-micron cavity size control that allows generation of a highly-coherent laser using a controllable Stimulated Brillouin Scattering process that includes matching of a cavity free-spectral-range to a Brillouin shift frequency in silica. While providing several advantages due to fabrication on a chip, the highly-coherent laser produced by the disk resonator may feature a Schawlow-Townes noise level as low as 0.06 Hz | 04-02-2015 |
20150155683 | METHOD OF FABRICATING AND OPERATING AN OPTICAL MODULATOR - A semiconductor device comprising a substrate; a monolithic gain region disposed on the substrate and operable to produce optical gain in response to current injection, including a first electrode over a first portion of the gain region having a first length L | 06-04-2015 |
20150236784 | STABILIZED MICROWAVE-FREQUENCY SOURCE - A microwave-frequency source at frequency f | 08-20-2015 |
20150236789 | DUAL-FREQUENCY OPTICAL SOURCE - A dual-frequency optical source comprises: (a) first and second pump laser sources arranged to generate optical pump power at respective first and second pump laser frequencies v | 08-20-2015 |
20150311662 | STABLE MICROWAVE-FREQUENCY SOURCE BASED ON CASCADED BRILLOUIN LASERS - A microwave-frequency source, generating an output electrical signal at an output frequency f | 10-29-2015 |
Patent application number | Description | Published |
20080203052 | METHOD OF FABRICATING A MICRORESONATOR - A method of fabricating a microresonator is disclosed. Initially, silica is deposited on a substrate, and the substrate is etched to form a pillar, the top portion of which supports the silica. The microresonator is then formed from the silica. Next, the pillar is etched to reduce the overall diameter of the top portion of the pillar so that the microresonator can be disengaged from the pillar. | 08-28-2008 |
20090263137 | PHOTONIC RF DOWN-CONVERTER BASED ON OPTOMECHANICAL OSCILLATION - An all optical radio frequency converter. The invention relates to a microtoroid optomechanical oscillator that can provide a local oscillation frequency and a mixing functionality. The microtoroid optomechanical oscillator can be fabricated from a silica-on-silicon wafer. When an input optical signal having an optical carrier frequency carrying a modulated RF signal representing information is applied to the microtoroid optomechanical oscillator, a signal including the baseband information modulated on the optical carrier is provided as output. The output signal can be detected with a photodetector. Information carried by the optical signal can be recorded and/or displayed to a user. Injection locking of the microtoroid optomechanical oscillator can be accomplished by providing a signal of suitable frequency. The frequency and the phase of operation of the microtoroid optomechanical oscillator can be locked to the respective frequency and phase of the injected locking signal. | 10-22-2009 |
20100085573 | SPLIT FREQUENCY SENSING METHODS AND SYSTEMS - Resonant sensors and molecule detection methods utilizing split frequency. Optical energy is introduced into a microcavity, such as a toroid-shaped or spherical microcavity. A portion of the optical energy is backscattered and interacts with the introduced optical energy to form first and second modes of optical energy at respective first and second frequencies, also referred to as split frequency or mode doublets. One or more molecules bind to an outer surface of the microcavity and interact with an evanescent field of optical energy resonating within the microcavity. Binding of one or more molecules to the outer surface is detected based at least in part upon a change of the split frequency relative to a baseline split frequency. | 04-08-2010 |
Patent application number | Description | Published |
20080226224 | OPTICAL JUNCTION APPARATUS AND METHODS EMPLOYING OPTICAL POWER TRANSVERSE-TRANSFER - An optical apparatus comprises an optical device formed on a device substrate, a first optical waveguide formed on the substrate or on the optical device, and a second, mechanically discrete optical waveguide assembled with the device substrate, optical device, or first optical waveguide. The first optical waveguide is arranged for transferring an optical signal between the optical device and the first optical waveguide. The first and second optical waveguides are arranged, when the second optical waveguide is assembled with the device substrate, optical device, or first optical waveguide, for transferring the optical signal therebetween via optical transverse coupling. | 09-18-2008 |
20100024192 | OPTICAL JUNCTION APPARATUS AND METHODS EMPLOYING OPTICAL POWER TRANSVERSE-TRANSFER - A method comprises: forming an optical device on a device substrate; forming a first optical waveguide on the device or device substrate; forming a second, structurally discrete optical waveguide on a structurally discrete waveguide substrate; and assembling the optical device, first waveguide, or device substrate with the second waveguide or waveguide substrate. The device and first waveguide are arranged for transferring an optical signal between the device and the first waveguide. Upon assembly the first and second waveguides are positioned between the device and waveguide substrates and are relatively positioned for transferring the optical signal therebetween via optical transverse coupling. The first or second optical waveguide is arranged for transferring the optical signal therebetween via substantially adiabatic optical transverse coupling with the first and second waveguides so positioned. | 02-04-2010 |
20100314027 | OPTICAL JUNCTION APPARATUS AND METHODS EMPLOYING OPTICAL POWER TRANSVERSE-TRANSFER - A method comprises: (i) forming a first optical waveguide on a first substrate; (ii) forming a second, structurally discrete optical waveguide on a structurally discrete second substrate; (iii) assembling the second substrate or second optical waveguide with the first substrate or first optical waveguide so that the first and second optical waveguides are positioned between the first and second substrates and are relatively positioned for transferring the optical signal therebetween via optical transverse coupling; and (iv) arranging the first or second optical waveguide for transferring the optical signal therebetween via substantially adiabatic optical transverse coupling with the first and second waveguides so positioned. | 12-16-2010 |