Class / Patent application number | Description | Number of patent applications / Date published |
372028000 | Frequency | 30 |
20080259977 | Waveguide Structure for Upconversion of Ir Wavelength Laser Radiation - The invention relates to a waveguide structure for upconversion of IR wavelength laser radiation and is characterized in comprising a) at least one base substrate layer made essentially out of a moisture-stable mechanically- and/or temperature-stable material b) at least one active layer made essentially out of a halide glass, preferably a fluoride glass located on the base substrate layer whereby the material of the at least one base substrate layer has a different composition from the material of the at least one active layer. | 10-23-2008 |
20080298404 | Radiation Beam Source Device - For optical data storage applications, for example, for holographic storage applications, a radiation beam ( | 12-04-2008 |
20080298405 | Modulation of terahertz radiation - A method of modulation terahertz radiation comprising: (A) generating Terahertz radiation by pumping nonequilibrium electrons into a Magnon Gain Medium (MGM), wherein propagation of nonequilibrium electrons in the MGM causes generation of nonequilibrium magnons, and wherein interaction between the nonequilibrium magnons causes generation of the Terahertz radiation; and (B) frequency modulating THz radiation generated in the MGM by applying longitudinal AC magnetic field, or by applying AC electrical field bias. | 12-04-2008 |
20080317075 | Determining and Setting the Frequency Modulation Index of a Laser in a Cpt Frequency Standard - A technique for determining the modulation index of a frequency-modulated laser source from the absorption spectrum that is produced when light from the laser passes through an alkali metal vapor cell. The absorption spectrum contains a primary minimum and a number of satellite minima and the modulation index is determined using ratios of the minima. The technique is used to calibrate the laser source of a CPT frequency standard so that it operates at a desired modulation index. Ways are disclosed of using the technique to calibrate the CPT frequency standard either manually or automatically. The calibration may be done when the CPT frequency standard is built, when the frequency standard is initialized, or during normal operation of the CPT frequency standard. | 12-25-2008 |
20080317076 | CONTROLLING OUTPUT WAVELENGTH OF A LIGHT SOURCE - A light source module including: an LD element outputting a laser light; a lens receiving the laser light and outputting a focused light; an optical filter having transmission wavelength characteristics, inputting the focused light, and outputting a transmitted light and a reflected light based on the transmission wavelength characteristics, a light-receiving element detecting the reflected light which passes thorough the lens and generating a detection signal; and a control unit configured to control an output wavelength of the LD element based on the detection signal. | 12-25-2008 |
20090086776 | Optical transmitter providing a plurality of transmitter units each having a thermo-electric cooler connected in series to each other - In a semiconductor laser manufacturing method, a GaN single-crystal substrate is formed by slicing a GaN bulk crystal, grown on a c-plane, parallel to an a-plane which is perpendicular to the c-plane. In this substrate, crystal defects extending parallel to the c-axis direction do not readily exert an influence, and degradation of element characteristics due to crystal defects can be suppressed. Further, because the a-plane is a nonpolar plane, improved light emission efficiency and longer wavelengths can be achieved compared with the c-plane, which is a polar plane. Hence a semiconductor laser manufacturing method of this invention enables further improvement of the element characteristics of the semiconductor laser to be fabricated. | 04-02-2009 |
20090238224 | Directly Modulated Laser with Isolated Modulated Gain Electrode for Improved Frequency Modulation - A DBR laser, such as a semiconductor DBR laser is disclosed having improved frequency modulation performance. The laser includes a split gain electrode and a tuning electrode. A modulating current encoding a data signal is injected into a first section of the gain electrode whereas a substantially DC bias voltage is imposed on a second section of the gain electrode positioned between the first gain electrode and the tuning electrode. The first and second gain electrodes are electrically isolated from each other and the tuning electrode by a large isolation resistance. In some embodiments, the isolation resistance is generated by forming the electrodes on a P+ layer and removing portions of the P+ layer between adjacent electrodes. Capacitors may couple to one or both of the second gain electrode and the tuning electrode. | 09-24-2009 |
20090268765 | Intra-Cavity Phase Modulated Laser Based on Intra-Cavity Depletion-Edge-Translation Lightwave Modulators - Use of depletion edge translation as an in cavity phase modulation mechanism in lasers. Aspects of the invention are especially relevant (without limitation) in transmitters for extended reach comprising an intra cavity phase and amplitude modulated laser for generation of a frequency modulated signal and a passive optical spectrum reshaper element, sometimes referred to as a chirp modulated laser. Such techniques may be carried out as disclose herein by adopting predetermined doping profiles and applying predetermined voltage to the laser cavity, and more preferably to a phase section in or adjoining the laser cavity. | 10-29-2009 |
20110122903 | Wide-Band Wavelength-Variable Laser Device - In a laser apparatus including an excitation light source and a resonator in which a laser medium is disposed between optical paths of a first mirror reflecting light in a desired wavelength band and a second mirror and a first wavelength selecting means is disposed between optical paths of the laser medium and the second mirror, there is provided a wavelength-variable laser apparatus capable of continuously varying the laser oscillation wavelength by using at least a Pr | 05-26-2011 |
20110206076 | SEED SOURCE FOR HIGH POWER OPTICAL FIBER AMPLIFIER - Methods and systems are provided to reduce stimulated Brillouin scattering in high power optical fiber amplifiers. In an embodiment, a seed source includes a narrow linewidth semiconductor laser driven with a current ramp that simultaneously sweeps the optical power and the lasing frequency at a rate fast enough to reduce stimulated Brillouin scattering. | 08-25-2011 |
20110243164 | PHASED LASER ARRAY WITH TAILORED SPECTRAL AND COHERENCE PROPERTIES - Architectures for coherently combining an array of fiber-based lasers are provided. By matching their lengths to within a few integer multiples of a wavelength, the spatial and temporal properties of a single large laser are replicated, while extending the average or peak pulsed power limit. | 10-06-2011 |
20120002689 | METHOD AND SYSTEM FOR NON-MECHANICAL RAPID TUNING OF AN OPTICAL PARAMETRIC OSCILLATOR - An OPO is disclosed capable of rapid frequency tuning by non-mechanical means. The OPO includes a resonant cavity including one or more non-linear crystals in an optical path thereof. A pump laser pulse is transmitted into the resonant cavity simultaneously with a seed beam having a desired wavelength. The output beam from the resonant cavity has the same center wavelength as the seed beam. The wavelength of the seed beam may be modulated at a frequency larger than the pulse rate of the pump laser or larger than the inverse of the pulse duration. The OPO disclosed may be used to perform DIAL analysis wherein intra-pulse modulation of an output beam is used to obtain measurements of absorption at multiple frequencies for each pulse of a pump beam. | 01-05-2012 |
20120063476 | OPTICAL WAVELENGTH COMB GENERATOR DEVICE - The present application relates to comb frequency generator devices generally and more particularly to the use of comb generators for use in fibre optic communications. More particularly, the application provides a frequency comb generator device. The device comprises a laser ( | 03-15-2012 |
20120093181 | Laser device for production of a frequency comb free of CEO - The invention relates to a laser device, comprising a radiation source ( | 04-19-2012 |
20120189027 | SYSTEM AND METHOD FOR PROVIDING CHIRPED ELECTROMAGNETIC RADIATION - A system and method for controllably chirping electromagnetic radiation from a radiation source includes an optical cavity arrangement. The optical cavity arrangement enables electromagnetic radiation to be produced with a substantially linear chirp rate and a configurable period. By selectively injecting electromagnetic radiation into the optical cavity, the electromagnetic radiation may be produced with a single resonant mode that is frequency shifted at the substantially linear chirp rate. Producing the electromagnetic radiation with a single resonant mode may increase the coherence length of the electromagnetic radiation, which may be advantageous when the electromagnetic radiation is implemented in various applications. For example, the electromagnetic radiation produced by the optical cavity arrangement may enhance a range, speed, accuracy, and/or other aspects of a laser radar system. | 07-26-2012 |
20120269215 | Bias circuit of electro-absorption modulated laser and calibration method thereof - A bias circuit of an electro-absorption modulated laser and a calibration method thereof are provided. The bias circuit includes a drive circuit and a direct current bias voltage circuit. The drive circuit is used for providing a forward bias voltage to a laser diode in the electro-absorption modulated laser to generate laser. The direct current bias voltage circuit is connected to a cathode of an electro-absorption modulator in the electro-absorption modulated laser, and provides a positive direct current bias voltage to the cathode to enable the reverse bias voltage of the electro-absorption modulator to fall within the range of modulation. When the reverse bias voltage falls within the range of modulation, the electro-absorption modulator utilizes the laser generated by the laser diode as optical carrier wave, modulates the optical carrier wave with the modulation voltage, and outputs a modulated optical signal. | 10-25-2012 |
20120300800 | PUSH-PULL MODULATED COUPLED VERTICAL-CAVITY SURFACE-EMITTING LASERS AND METHOD - A laser system having separately electrically operable cavities for emitting modulated narrow linewidth light with first, second and third mirror structures separated by a first active region between the first and the second and by a second active region between the second and the third. The second mirror structure has twenty of more periods of mirror pairs. | 11-29-2012 |
20130010821 | LASER SYSTEM - A laser system | 01-10-2013 |
20130100973 | DEVICE FOR PRODUCING HIGH FREQUENCIES BY MEANS OF LIGHT FREQUENCY BEATING - In the field of the production of very high frequencies, for example from 1 gigahertz to several terahertz, by beating the frequencies of two laser beams together, a device includes a resonant optical cavity having very stable dimensions receiving the beams, with for each beam, an interrogation device of the resonant cavity supplying an electrical signal representing the difference in frequency between the light frequency of the beam and a resonance frequency of the resonant cavity. The frequency of each beam is servo controlled to minimize the frequency difference observed. The laser beams are produced by a dual-frequency laser producing two beams of different frequencies and orthogonal polarizations. A polarization separator is used for separate servo control of the beams according to polarization, and a polarizer is placed behind a main output of the resonant cavity producing an electromagnetic beam mixing the two polarizations and amplitude-modulated at the beat frequency. | 04-25-2013 |
20130121354 | OPTICAL INTERCONNECTION SYSTEM - There is provided an optical interconnection system including a plurality of semiconductor integrated devices each including a surface emitting laser array device including a plurality of surface emitting laser devices each emitting an output laser signal light of a different wavelength modulated based on an input modulated signal, a silicon optical waveguide that guides output laser signal lights emitted from the surface emitting laser devices of each of the semiconductor integrated devices to another semiconductor integrated device, a plurality of optical couplers respectively corresponding to the semiconductor integrated devices and guiding the output laser signal lights to the silicon optical waveguide, and a plurality of optical splitters respectively corresponding to the semiconductor integrated devices, receiving the output laser signal lights guided by the silicon optical waveguide, and inputting an input laser signal light to a corresponding one of the semiconductor integrated devices. | 05-16-2013 |
20130128906 | LASER OSCILLATION APPARATUS - Provided is a laser oscillation apparatus capable of stabilizing resonance even when finesse of an optical resonator is increased and generating stronger laser light than that of a traditional apparatus by accumulating laser light in the optical resonator. The laser oscillation apparatus includes a laser light source which generates laser light for excitation, a fiber amplifier which generates laser light with a desired wavelength when the laser light generated at the laser light source for excitation is supplied, an optical resonator, an optical isolator which is interposed between the optical resonator and the fiber amplifier and which guides the laser light from the fiber amplifier to one side of the optical resonator while blocking laser light in the opposite direction, a circulation optical path which accelerates resonance as introducing laser light emitted from the other side of the optical resonator and returning the laser light to the optical resonator via the fiber amplifier and the optical isolator, and a modulator which performs amplitude modulation on the laser light in the circulation optical path. | 05-23-2013 |
20130148675 | LASER DIODE FOR CONTROLLING SPATIAL HOLE BURNING AND OPTICAL PULSE GENERATING METHOD - A high-efficiency laser diode is provided. Since a λ/4 phase-shifted distributed feedback (DFB) laser diode has a great coupling coefficient, mode stability is poor due to spatial hole burning when multiplication of the coupling coefficient by length of a resonator is equal to or greater than 2. In the inventive concept, a region capable of controlling spatial hole burning is inserted into a semiconductor laser diode structure. Thus, an ultrahigh-speed pulse laser diode having a repetition rate in the band ranging from 100 GHz to 300 GHz is obtained. In addition, a single-mode laser diode with improved energy use efficiency is implemented by changing the configuration of a laser diode. | 06-13-2013 |
20130301664 | HIGH SPECTRAL-PURITY CARRIER WAVE GENERATION BY NONLINEAR OPTICAL MIXING - Signal generating systems and methods are described. One signal generation system includes first and second lasers configured to generate first and second laser beams having respective frequencies wherein a difference in the respective frequencies corresponds to an output frequency, a photodetector configured to produce a signal at the output frequency, and first and second electro-optic modulators configured to respectively electro-optically modulate the first and second laser beams using the signal to produce respective first and second modulated optical signals, each of the first and second modulated optical signals having a respective sideband corresponding to the frequency of the other one of the first and second laser beams. The first laser is seeded with the respective sideband of the second modulated optical signal and the second laser is seeded with the respective sideband of the first modulated optical signal to phase-lock the first and second laser beams to each other. | 11-14-2013 |
20140112360 | METHOD FOR GENERATING COHERENT-PHASE LIGHT FIELDS HAVING A PREDEFINABLE VALUE OF THE FREQUENCY THEREOF, AND OPTICAL FREQUENCY SYNTHESIZER - The invention relates to a method for generating coherent-phase light having a predefinable frequency value (ν | 04-24-2014 |
20140219301 | REFLECTIVITY-MODULATED GRATING MIRROR - The invention relates to vertical cavity lasers (VCL) incorporating a reflectivity-modulated grating mirror ( | 08-07-2014 |
20140254619 | METHOD FOR WIDEBAND SPECTRALLY EQUALIZED FREQUENCY COMB GENERATION - The present invention relates to method for spectrally equalized frequency comb generation. In order to carry this method, the following steps are followed: seed laser or lasers are modulated to acquire frequency chirp necessary to enable temporal compression and an increase in peak optical intensity necessary for an efficient nonlinear optical mixing process to occur; the compressed waveform is reshaped by nonlinear-transfer optical element and subsequently used to generate frequency comb in nonlinear waveguide. Ultimately, at the conclusion of these steps, a frequency comb is generated with substantially flat optical spectrum, while retaining variability with respect to the frequency pitch, high coherency and substantially wide spectral band of coverage. | 09-11-2014 |
20140355631 | METHOD FOR OPTICAL FREQUENCY SYNTHESIS - A method for generation of electromagnetic radiation has the following method steps:
| 12-04-2014 |
20140376578 | LASER EMISSION DEVICE WITH INTEGRATED LIGHT MODULATOR - Laser emission device with integrated light modulator comprising: a multilayer waveguide comprising, on a support layer, a first guiding layer, a first doped layer, a second guiding layer of light amplifying material, and a biasing second doped layer opposite the first doped layer, the waveguide comprising a laser amplification section ( | 12-25-2014 |
20160043529 | MONOLITHICALLY INTEGRATED SURFACE EMITTING LASER WITH MODULATOR - A surface emitting laser includes a structure in which a semiconductor substrate, a lower DBR, and an active layer are layered. A VCSEL (vertical cavity surface emitting laser) and an EAM (electro-absorption modulator) are formed adjacent to each other along a first direction defined on the substrate plane such that they are optically coupled. The EAM outputs an emitted light in a direction that is orthogonal to the substrate. The width of a waveguide region of the VCSEL defined in the second direction is narrower than the width of a waveguide region of the EAM. | 02-11-2016 |
20220140569 | DFB WITH WEAK OPTICAL FEEDBACK - A distributed feedback plus reflection (DFB+R) laser includes an active section, a passive section, a low reflection (LR) mirror, and an etalon. The active section includes a distributed feedback (DFB) grating and is configured to operate in a lasing mode. The passive section is coupled end to end with the active section. The LR mirror is formed on or in the passive section. The etalon includes a portion of the DFB grating, the passive section, and the LR mirror. The lasing mode of the active section is aligned to a long wavelength edge of a reflection peak of the etalon. | 05-05-2022 |