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70 results about "Gaussian mode" patented technology
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The intensity distribution of such a mode (Figure 1) has n nodes in the horizontal direction and m nodes in the vertical direction. For n = m = 0, a Gaussian beam is obtained. This mode is called the fundamental mode or axial mode, and it has the highest beam quality with an M2 factor of 1.
Optical phase conjugation laser diode
A phase-conjugating resonator that includes a semiconductor laser diode apparatus that comprises a phase-conjugating array of retro-reflecting hexagon apertured hexahedral shaped corner-cube prisms, an electrically and / or optically pumped gain-region, a distributed bragg reflecting mirror-stack, a gaussian mode providing hemispherical shaped laser-emission-output metalized mirror. Wherein, optical phase conjugation is used to neutralize the phase perturbating contribution of spontaneous-emission, acoustic phonons, quantum-noise, gain-saturation, diffraction, and other intracavity aberrations and distortions that typically destabilize any stimulated-emission made to undergo amplifying oscillation within the inventions phase-conjugating resonator. Resulting in stablized high-power laser-emission-output into a single low-order fundamental transverse cavity mode and reversal of intra-cavity chirp that provides for high-speed internal modulation capable of transmitting data at around 20-Gigabits / ps.
Owner:HENRICHS JOSEPH REID
Laser with a tailored axially symmetric pump beam profile by mode conversion a waveguide
InactiveUS20140044143A1Fibre with gratingsOptical devices for laserResonant cavityUltimate tensile strength
A laser device comprising a pump source (10) operable to generate a pump beam (11) for a resonant cavity in which a laser medium (74) is arranged. A beam-shaping waveguide element (18) is arranged between the pump source and the resonant cavity. Shaping of the pump beam is achieved by tailoring the refractive index profile of the waveguide element (18) so that it yields an intensity distribution which spatially overlaps a desired ring-shaped Laguerre-Gaussian mode of the resonant cavity sufficiently well to achieve laser oscillation on said desired Laguerre-Gaussian mode. A ring-shaped or doughnut-shaped laser beam profile can thus be generated. It is further possible to design the refractive index profile (76) so that the pump beam's intensity distribution also spatially overlaps the fundamental mode of the resonant cavity sufficiently well to achieve laser oscillation also on said fundamental mode. The laser will then lase on both the fundamental mode and the selected Laguerre-Gaussian mode. This is useful for producing a variety of beam profiles based on mixing a Gaussian profile with a ring-shaped profile. A top-hat beam profile can be achieved by such mixing.
Owner:UNIV OF SOUTHAMPTON
Apparatus and method for a waveguide with an index profile manifesting a central dip for better energy extraction
InactiveUS7400807B2Laser detailsOptical fibre with graded refractive index core/claddingFiberHigh index
A method and apparatus is described that use an index-of-refraction profile having a significant central dip in refractive index (or another tailored index profile) within the core of a gain fiber or a gain waveguide on a substrate. The benefits of this central dip (more power with a given mode structure) are apparent when an input beam is akin to that of a Gaussian mode. In some embodiments, the invention provides a fiber or a substrate waveguide having an index profile with a central dip, but wherein the device has no doping. Some embodiments use a central dip surrounded by a higher-index ring in the index of refraction of the core of the fiber, while other embodiments use a trench between an intermediate-index central core portion and the ring, or use a plurality of rings and / or trenches. Some embodiments use an absorber in at least one core ring.
Owner:LOCKHEED MARTIN CORP
Apparatus and method for a waveguide with an index profile manifesting a central dip for better energy extraction
InactiveUS20070206912A1Increase the cross-sectional areaKeep energy smallLaser detailsOptical fibre with graded refractive index core/claddingPhysicsGaussian mode
A method and apparatus is described that use an index-of-refraction profile having a significant central dip in refractive index (or another tailored index profile) within the core of a gain fiber or a gain waveguide on a substrate. The benefits of this central dip (more power with a given mode structure) are apparent when an input beam is akin to that of a Gaussian mode. In some embodiments, the invention provides a fiber or a substrate waveguide having an index profile with a central dip, but wherein the device has no doping. Some embodiments use a central dip surrounded by a higher-index ring in the index of refraction of the core of the fiber, while other embodiments use a trench between an intermediate-index central core portion and the ring, or use a plurality of rings and / or trenches. Some embodiments use an absorber in at least one core ring.
Owner:LOCKHEED MARTIN CORP
Laser with hybrid-unstable ring resonator
InactiveUS20070019701A1Reduce sensitivityReduced passive power lossOptical resonator shape and constructionActive medium materialRing laserHigh intensity
A unidirectional ring laser oscillator has a travelling wave unstable mode in one transverse dimension and either a waveguide or freespace Gaussian mode in the orthogonal transverse dimension for coupling to large volumes of asymmetric cross section laser gain media. This device concept is shown to have unique and innovative features such as an exchange of left for right in the intracavity radiation profile without having to employ concave optics. Also, a high insensitivity to misalignment of one of the intracavity ring optics is achieved without having to suffer any deleterious effects associated with the high intensity of radiation normally encountered at an intracavity focal plane. Unidirectional operation of the laser is achieved using both intracavity and extracavity optical techniques.
Owner:PRIMA IND
Health degree assessment method and system for equipment under multiple modes based on cross entropy method
ActiveCN106934242APrevent overfittingHealth assessment implementationInformaticsSpecial data processing applicationsFeature extractionMultiple modes
The invention provides a health degree assessment method and system for equipment under multiple modes based on a cross entropy method. The method comprises the steps that health data and operating data of the equipment or a component in the equipment are acquired; feature extraction is performed on the acquired health data and operating data to form a health feature database and an operating feature database; the number of Gaussian modes in a Gaussian mixed model is determined by the adoption of the cross entropy method according to the data in the health feature database; a health Gaussian mixed model is established according to the data in the health feature database and the determined number of Gaussian modes, and an operating Gaussian mixed model is established according to the operating feature database and the determined number of Gaussian modes; the coincidence degree of the health Gaussian mixed model and the operating Gaussian mixed model under multiple modes is calculated; and the health degree of the equipment or the component is assessed according to the coincidence degree obtained through calculation.
Owner:HANGZHOU ANMAISHENG INTELLIGENT TECH CO LTD
Fiber integrated Gaussian-ring-shaped mode field adaptor
ActiveCN109799572AImprove coupling efficiencyEasy to makeOptical fibre with multilayer core/claddingCoupling light guidesFiberDouble-clad fiber
The invention provides a fiber integrated Gaussian-ring-shaped mode field adaptor. The fiber integrated Gaussian-ring-shaped mode field adaptor is characterized by comprising a single mode fiber 1, adouble-clad fiber 2 and a ring-shaped mode field fiber 3 which are connected, wherein the double-clad fiber 2 with the length at a centimeter scale is arranged between the single mode fiber 1 and thering-shaped mode field fiber 3, and both ends of the double-clad fiber 2 are welded; thermal diffusion is applied to the welded point 12 of the double-clad fiber 2 and the ring-shaped mode field fiberto form a refractive index gradient area inside a thermal diffusion area 13 so that the fundamental mode of the double-clad fiber 2 can converted in a thermally insulated mode into the fundamental mode of the ring-shaped mode field fiber 3. The fiber integrated Gaussian-ring-shaped mode field adaptor can be applied to high-coupling-efficient mold field adaption between Gaussian mode field fibersand ring-shaped mode field fibers and accordingly can be widely applied to various applications based on the ring-shaped mode field fibers and the fields of ring-shaped mode field-based fiber integrated devices, laser devices, sensors and the like.
Owner:GUILIN UNIV OF ELECTRONIC TECH
Optical fiber eigenmode multiplexing communication method and system
ActiveCN107171731AImprove spectral efficiencyIncrease capacityOptical mode multiplex systemsMultimode transmissionDigital signal processingMultiplexing
The invention discloses an optical fiber eigenmode multiplexing communication method and system. The method comprises the following steps: directly taking optical fiber eigenmode as an information carrier, and then performing low-crosstalk multiplexing transmission on multiple optical fiber eigenmodes in the eigenmode separated multi-model optical fiber. The system comprises a transmitting end, a multichannel eigenmode multiplexer, the eigenmode separated multimode optical fiber, the eigenmode separated optical amplifier, a multichannel eigenmode de-multiplexer and a receiving end; the effective refractive index difference between the multichannel optical fiber eigenmodes supported by the eigenmode separated multimode optical fiber is large and the crosstalk is low; the multichannel eigenmode multiplexer realizes the conversion and the multiplexing to the optical fiber eigenmode from the multichannel Gaussian mode; the multichannel eigenmode multiplexer realizes the conversion and de-multiplexing to the Gaussian mode from the multichannel optical fiber eigenmode; the multiplexing and the de-multiplexing are extensible and provide the single mode optical fiber interface. The optical fiber eigenmode multiplexing communication method disclosed by the invention supports the low-crosstalk multiplexing communication of the multichannel optical fiber eigenmode, the multi-in and multi-out digital signal processing is unnecessary, the single model optical fiber is compatible, and the communication capacity and the spectrum efficiency can be effectively improved.
Owner:HUAZHONG UNIV OF SCI & TECH
Method of distribution of absorption of laser crystal radial-direction non-uniform doping control pump light
InactiveCN103490278AAvoid the risk of falling off or even end face burstingImprove conversion efficiencyLaser output parameters controlActive medium materialPlane mirrorThin lens
The invention relates to a method of distribution of absorption of laser crystal radial-direction non-uniform doping control pump light. The method is characterized in that after the pump light output by an optical fiber coupling laser diode optical fiber output end is gathered by a coupling system, the light field of the pump light is distributed in a Gaussian mode or flat Gaussian mode; a pump light anti-reflection film and an oscillating high-reflection film are plated on the pump end face of a radial-direction non-uniform doping crystal, an output mirror is a plane mirror, and the output mirror and the oscillating light high-reflection film on the pump end face of the crystal form a flat resonant cavity; in the working process, a thermal lens formed in the crystal can be simply equivalent to a thin lens on the pump end face of the radial-direction non-uniform doping crystal, and the resonant cavity becomes a stable cavity through the gather effect of the thermal lens; under the condition that a pump light distribution area and an oscillating light distribution area are determined, the spatial overlapping of the pump light distribution area and the oscillating light distribution area are achieved through the radial-direction non-uniform doping optimization design of the laser crystal. According to the method, ideal space coupling efficiency and ideal beam quality can be achieved.
Owner:XIDIAN UNIV
Intra-cavity non-degenerate laguerre mode generator
ActiveUS20100020833A1Optical resonator shape and constructionActive medium shape and constructionPrismSolid-state laser
A lasing method including the steps of providing a laser resonator; utilizing birefringence compensation in said resonator whereby said resonator is induced to operate in a Laguerre-Gaussian higher order mode; and utilizing polarized outcoupling of lasing energy at said higher order mode from said resonator. In the illustrative application, the laser resonator is a high-power, solid-state laser resonator. In the specific embodiment, the inventive method further includes the step of changing an outcoupling preference for a non-degenerate high-order Laguerre-Gaussian mode. In one embodiment, the step of changing outcoupling preference includes the step of changing an outcoupling polarization. In another embodiment, the step of changing outcoupling preference includes the step of changing an orientation of a roof edge of a prism in the laser resonator. Lower order Laguerre modes are discouraged from appearing in an output of the resonator by adding loss at the center of the rod aperture of the resonator or detuning the orientation of a first or a second quarter-wave plate. In the illustrative embodiment, the gain lifetime of the resonator is longer than an interpulse period thereof.
Owner:OL SECURITY LIABILITY CO
A method for judging topological charges by using phase singularities
The invention discloses a method for judging topological charges by using phase singularities. The method comprises the steps of: step 1, selecting n beams of vortex beams in an arithmetic progressionand setting an equaldifference as Delta; step 2, performing a superposition of Laguerre-Gaussian mode for the distributed n beams of the vortex beams in the arithmetic progression to produce a composite vortex; step 3, simulating the composite vortex of the arithmetic progression to obtain a simulation diagram; and step 4, judging the topological charges of the composite vortex according to lightintensity distribution of the composite vortex simulation diagram obtained in step 3. According to the method for judging the topological charges by using the phase singularities, a number and a position of the phase singularity of the composite vortex beams after the multi-vortex superposition of the topological charges inarithmetic series is obtained; the topological charges in arithmetic series are acurately judged by phase distribution and an evolution principle of singularity feature, thereby providing a new idea for vortex beams detection.
Owner:XIAN UNIV OF TECH
System for realizing terahertz wave beam transmission and bunching
InactiveCN107271470AReduce lossImprove transmission efficiencyAnalysis using nuclear magnetic resonancePhase correctionPhase difference
The invention discloses a system for realizing terahertz wave beam transmission and bunching. The system comprises a corrugated waveguide input / output window, a rotating parabolic reflector and a phase position correcting mirror. A quasi-Gaussian mode is transmitted through mode corrugated waveguide and is radiated to a free space through a corrugated waveguide input end. The rotating parabolic reflector receives the quasi-Gaussian wave beam. After focusing and reflection, the wave beam irradiates the phase position correcting mirror, phase distribution is adjusted and the phase difference of the wave beam cross section is eliminated so that the wave beam satisfies Gaussian distribution in the phase and field strength and can be well coupled to the corrugated waveguide corresponding to the output window.
Owner:UNIV OF ELECTRONICS SCI & TECH OF CHINA
Gaussian beam filter with diagonal horn structure and implementation method thereof
ActiveCN107528106AHigh puritySolve the problem that is not idealWaveguide type devicesGaussian beamEngineering
The present invention discloses a Gaussian beam mode filter with a diagonal horn structure and an implementation method thereof. The Gaussian beam mode filter with the diagonal horn structure is designed on the basis of a characteristic that a corrugated horn can generate high-purity hybrid HE11 modes and the principle of antenna reciprocity; when undesired Gaussian beams radiated from an gyrotron output window pass through a first corrugated horn, only a single TE11 mode passes the first corrugated horn; the TE11 mode is subjected to mode conversion of a second corrugated horn, so that highly-pure mixed HE11 modes are generated; and the highly-pure mixed HE11 modes are finally fed into an overmoded waveguide transmission line. With the Gaussian beam mode filter with the diagonal horn structure and the implementation method thereof of the invention adopted, the problem of undesired Gaussian modes of quasi-optical transmission can be solved, the purity of Gaussian modes fed into the transmission line can be effectively improved, and therefore, the high-efficiency transmission of terahertz waves can be realized.
Owner:PEKING UNIV
Etching device adopting square light spot to etch double faced ITO glass
InactiveCN103658977ASolve the problem of uneven and cleanEnsure complete removalWelding/soldering/cutting articlesLaser beam welding apparatusLight spotLight beam
The invention discloses an etching device adopting a square light spot to etch double faced ITO glass. A laser beam energy distribution mode can be converted from a Gaussian mode into an equipower distribution mode. A film at the irradiated portion can be evenly removed by shaped laser beams, namely the removed film thickness is consistent. The etching device comprises a support mechanism and equipower distribution shaping laser path mechanisms. The support mechanism comprises an upper support device and a lower support device which respectively comprise an equipower distribution shaping laser path mechanism used for providing equipower laser beams. In the Gaussian mode, energy distribution is large in middle and small in periphery in the use process of the laser beams, residues are retained on the machining edge of the double faced ITO glass in the etching process, and product machining problems are caused. The equipower laser beams can well solve the problems.
Owner:KUNSHAN THETA MICRO
Dolphin bionic active pulse signal modeling method
InactiveCN106405529AWith broadbandGood detection waveformWave based measurement systemsFrequency spectrumWeight coefficient
The invention relates to a dolphin bionic active pulse signal modeling method. The method comprises the following steps: 1, selecting pulse seed signals, i.e., according to a task target, selecting one or more pulses from single frequency, linear frequency modulation, hyperbolic linear frequency modulation and Rayleigh pulses as component seed signals; 2, determining a component quantity and frequency spectrum distribution of bionic signals, wherein there can be components in any quantities, two to three components are taken for the sake of simplicity, in terms of energy distribution of spectra, whether target detection focuses on a low-frequency portion or a high-frequency portion is mainly considered, and proper weights are given; 3, performing linear superposition after each component is delayed and weighed; and 4, enveloping a superposition result through a Gaussian mode. According to the invention, output spectrum distribution of synthetic signals can be obtained through adjusting weight coefficients and time delays, a certain adaptive mechanism is employed so that optimal detection waveforms can be obtained, and the defect of variation of detection performance due to restrictions of environment and targets under a conventional fixed detection mode can be effectively improved.
Owner:HARBIN ENG UNIV
Arrayed waveguide grating spectrum planarization method
InactiveCN105137538ASimple planEasy to implementOptical waveguide light guideMulti inputManufacturing technology
The invention discloses an arrayed waveguide grating spectrum planarization method. The method is based on a planar optical waveguide technology and has an effect of improving channel bandwidth of arrayed waveguide grating. The method comprises the steps that a transition region (a preview width region) which has a porous structure (7) and is used for transition of strip waveguide (or ridge waveguide) and slab waveguide is designed and manufactured at the connecting part (6) of the ridge or strip waveguide (including input waveguide, output waveguide and waveguide arrays) and the slab waveguide of the arrayed waveguide grating so that an effect of mode field preview width can be achieved. When an optical mode field reaches the boundary of the slab waveguide through waveguide transmission and the porous structure, an original Gaussian mode field is transformed into optical mode field distribution similar to a rectangle so that flat spectrum response can be obtained. The method is easy and feasible and is suitable for large-scale multi-input multi-output arrayed waveguide grating and can be completed only by a standard planar waveguide manufacturing technology.
Owner:INST OF SEMICONDUCTORS - CHINESE ACAD OF SCI +1
Generation of high-power spatially-restructurable spectrally-tunable beams in a multi-arm-cavity vecsel-based laser system
ActiveUS20190312408A1Laser optical resonator constructionExcitation process/apparatusLight beamTransverse mode
A collinear T-cavity VECSEL system generating intracavity Hermite-Gaussian modes at multiple wavelengths, configured to vary each of these wavelengths individually and independently. A mode converter element and / or an astigmatic mode converter is / are aligned intracavity to reversibly convert the Gaussian modes to HG modes to Laguerre-Gaussian modes, the latter forming the system output having any of the wavelengths provided by the spectrum resulting from nonlinear frequency-mixing intracavity (including generation of UV, visible, mid-IR light). The laser system delivers Watt-level output power in tunable high-order transverse mode distribution.
Owner:THE ARIZONA BOARD OF REGENTS ON BEHALF OF THE UNIV OF ARIZONA
Generation of high-power spatially-restructurable spectrally-tunable beams in a multi-arm-cavity VECSEL-based laser system
ActiveUS10511145B2Laser optical resonator constructionExcitation process/apparatusLight beamTransverse mode
A collinear T-cavity VECSEL system generating intracavity Hermite-Gaussian modes at multiple wavelengths, configured to vary each of these wavelengths individually and independently. A mode converter element and / or an astigmatic mode converter is / are aligned intracavity to reversibly convert the Gaussian modes to HG modes to Laguerre-Gaussian modes, the latter forming the system output having any of the wavelengths provided by the spectrum resulting from nonlinear frequency-mixing intracavity (including generation of UV, visible, mid-IR light). The laser system delivers Watt-level output power in tunable high-order transverse mode distribution.
Owner:THE ARIZONA BOARD OF REGENTS ON BEHALF OF THE UNIV OF ARIZONA
High-power laser Donut mode shaping device and shaping lens
The invention discloses a high-power laser Donut mode shaping device and a shaping lens. A reflecting surface of the shaping lens is in a shape with a protrusion at the middle part and a recess at theperiphery in whole; the reflecting surface is formed by rotating around a vertical straight line through a first bus; the first bus is a section of arc line; the curvature radius of the first bus is4200 mm; the vertical straight line penetrates through the lower end point of the first bus; a vertical distance between the upper end point of the first bus and the upper end point of the first bus is 0.00625 mm; and the central angle of the first bus is 0.04 degree. The Donut mode shaping device comprises the shaping lens and a high-power radio frequency slab CO2 laser, wherein the high-power radio frequency slab CO2 laser is used for outputting a light beam with a Gaussian mode, and the light beam is input into the shaping lens. The high-power laser Donut mode shaping device and the shapinglens are suitable for occasions with the wider weld width.
Owner:佛山根固激光科技有限公司
High-speed receiver architecture
ActiveUS8831074B2Lower latencyIncrease loop bandwidthModulated-carrier systemsOther decoding techniquesPattern recognitionTransceiver
A receiver (or transceiver) is selectable between a Gaussian mode and a non-Gaussian mode. In the non-Gaussian mode, a transformation block applies a non-linear transformation to signal samples to convert non-Gaussian noise in the signal samples to Gaussian or approximately Gaussian noise. In the Gaussian mode, the transformation block is bypassed. Samples are equalized using an equalizer configured to operate with a Gaussian or approximately Gaussian channel.
Owner:MARVELL ASIA PTE LTD
Fiber integrated Gaussian mode field beam splitter/combiner
ActiveCN111308608AEasy to makeRealize Gaussian mode field transformationCoupling light guidesMulticore optical fibreDouble-clad fiberBeam splitter
The invention provides a fiber integrated Gaussian mode field beam splitter / combiner. The optical fiber is characterized by being formed by connecting a single-mode optical fiber 1, a double-clad optical fiber 2 and a multi-core optical fiber 3, wherein the double-clad optical fiber 2 with the length of more than centimeter in the Gaussian mode field beam splitter / combiner is positioned between the single-mode optical fiber 1 and the multi-core Gaussian mode field optical fiber 3, and two ends of the double-clad optical fiber 2 are respectively welded. The Gaussian mode field beam splitter / combiner applies thermal diffusion at a welding point 12 of a double-clad optical fiber 2 and a multi-core Gaussian mode field optical fiber 3, and the purpose of thermal diffusion is to form a refractive index gradient region in a thermal diffusion region 13, so that a fundamental mode of the double-clad optical fiber 2 can be adiabatically converted into a fundamental mode of the multi-core Gaussian mode field optical fiber 3. The method can be used for Gaussian mode field conversion with high coupling efficiency between a single-core Gaussian mode field and a multi-core Gaussian mode field, and can be widely applied to the fields of multi-core optical fiber-based applications, multi-core optical fiber-based optical fiber integrated devices, optical fiber sensors, optical fiber lasers and the like.
Owner:GUILIN UNIV OF ELECTRONIC TECH
THz wave transmission beaming system realizing large angle adjustability of output direction
ActiveCN107655923AImprove efficiencyGood Gaussian compositionAnalysis using nuclear magnetic resonanceMeasurements using NMRPhase correctionPhase difference
The invention discloses a THz wave transmission beaming system realizing large angle adjustability of output direction. The system is characterized by being composed of a corrugated waveguide input / output window, a rotating parabolic reflector and an angle-adjustable phase correction mirror, a transmission system with output field angle adjustable along with output window direction is designed, and high transmission efficiency is maintained within a large angle changing range. A quasi-Gaussian mode is input into the system through over-mode corrugated waveguide and radiated to free space, therotating parabolic reflector receives this quasi-Gaussian wave beam, and angle of the wave beam is changed after reflection while beaming is realized. At the moment, angle of the phase correcting mirror is adjusted correspondingly according to angle of the corrugated waveguide input / output window. The wave beam enters the phase correcting mirror, and phase difference of the section of the wave beam is eliminated, so that a wave beam capable of meeting Gaussian distribution in two aspects of both phase and field intensity is formed and can be well coupled into corrugated waveguide correspondingto the output window.
Owner:UNIV OF ELECTRONICS SCI & TECH OF CHINA
Hermite-Gaussian mode beam splitter
ActiveCN109633920ANo diffraction involvedGet rid of immutable constraintsOptical elementsBeam splitterPhase difference
The invention relates to a Hermite-Gaussian mode beam splitter. The Hermite-Gaussian mode beam splitter comprises a phase converter and an interference device; the phase converter is added to the interference device; the interference device splits a light beam into a light beam A and a light beam B; the light beam A passes through the phase converter, and the light beam B does not pass through thephase converter; and the two light beams are combined again at the exits of the interference device. Phase values introduced by the phase converter and the arrangement mode of the phase converter arechanged, so that different phase differences are correspondingly generated at the two exits, and are related to a Hermite-Gaussian mode horizontal parameter m or vertical parameter n; a finally-inputted mode emerges at different exits, and therefore, Hermite-Gaussian mode beam splitting is realized. The Hermite-Gaussian mode beam splitter of the invention is based on two feature parameters, namely, the Hermite-Gaussian mode horizontal parameter and vertical parameter, any mode conversion does not occur, and the beam is split under a mode undamaged condition; a whole process does not involve diffraction, and the light directly transmits through the device, or is reflected, and therefore, the Hermite-Gaussian mode beam splitter can be considered as a general transmissive or reflective opticdevice.
Owner:XI AN JIAOTONG UNIV
Reverse design method of photon orbital angular momentum mode multiplexer/demultiplexer
ActiveCN111211843AImprove performanceHigh bandwidthPhotonic quantum communicationOptical elementsPhase shiftedEngineering
The invention discloses a reverse design method of a photon orbital angular momentum mode multiplexer / demultiplexer. The method comprises the following steps: setting a plurality of phase plates separated by free space, marking one phase plate as Le, and fixing the phase plate as an equivalent form of an elliptical lens; calculating an inclined plane wave mode formed by reversely propagating an output Gaussian mode to Le and carrying out Le phase modulation, and optimizing the first phase plate to Le by using a wavefront matching method from an OAM mode to the inclined plane wave mode until convergence; releasing restrictions on the phase plates fixed as the elliptical lens, and optimizing all the phase plates by using a wavefront matching method from an OAM mode to a Gaussian mode until convergence; taking the phase shift value phi i of each pixel of all the phase plates as a parameter, taking the weighted average of crosstalk of adjacent orders as an objective function, minimizing the objective function through a steepest descent method, and stopping iteration of the steepest descent method until the maximum crosstalk of the adjacent orders is smaller than or equal to the maximumcrosstalk of non-adjacent orders.
Owner:SUN YAT SEN UNIV
Gaussian light comprehensive experiment teaching system and experiment method thereof
ActiveCN111028641AEasy to understandMake up for the lack of cutting-edge experimentsEducational modelsSpatial light modulatorLight spot
The invention discloses a Gaussian light comprehensive experiment teaching system and an experiment method thereof. The system comprises a Gaussian mode generation module I, a mode mutual conversion module II and a mode acquisition module III. The Gaussian mode generation module I comprises a laser, an attenuation sheet, a beam expanding system, a non-polarization beam splitter and the like; the mode mutual conversion module II comprises an integrated Gaussian light mode converter and the like; the mode acquisition module III is a charge-coupled device image sensor; the laser is used for generating fundamental mode Gaussian light, then the light intensity is weakened by an attenuation sheet, the size of a light spot is increased by the beam expanding system, the polarization component of the light beam is adjusted by a half-wave plate, and the light beam can uniformly and vertically enters a spatial light modulator after passing through a non-polarization beam splitter, finally the selected first-stage diffracted light is a finally generated Gaussian mode after passing through an optical 4F system combined with a small hole; after being reflected by the reflector, the first-stage diffraction light sequentially passes through the adjusting lens and the integrated Gaussian light mode converter and finally enters the charge-coupled device image sensor.
Owner:XI AN JIAOTONG UNIV
Efficient generation of spatially-restructurable high-order hg-modes in a laser cavity
ActiveUS20220045480A1Laser optical resonator constructionExcitation process/apparatusConvertersEngineering
A vertical external cavity surface emitting laser (VECSEL) based system in a linear single cavity configuration is configured to deliver light in higher-order Hermite-Gaussian transverse modes with Watt-level output power. Simultaneous and independent lasing of spatially-restructurable multiple high-order transverse modes that are collinearly-propagating at the output of such laser cavity is facilitated with the use of an optical pumping scheme devised to control positions of location at which the gain medium of the system is pumped (e.g., locations of focal spots of multiple pump beams on the gain-medium chip). An external astigmatic mode converter is utilized to convert such high-order Hermite-Gaussian modes into corresponding Laguerre-Gaussian modes.
Owner:THE ARIZONA BOARD OF REGENTS ON BEHALF OF THE UNIV OF ARIZONA
A Hermitian-Gaussian mode beam splitter
ActiveCN109633920BNo diffraction involvedGet rid of immutable constraintsOptical elementsConvertersBeam splitter
Owner:XI AN JIAOTONG UNIV
A Device for Directly Generating Narrow Linewidth Vortex Lasers
Owner:HUAZHONG UNIV OF SCI & TECH
Non-linear coupling method for achieving intermediate infrared wave band laser source tertiary cascade efficient frequency conversion
The invention discloses a non-linear coupling method for achieving intermediate infrared wave band laser source tertiary cascade efficient frequency conversion. The method includes the steps that firstly, a laser source and PPLN crystal are selected; secondly, the PPLN crystal is processed to achieve quasi-phase matching when light waves are transmitted in the PPLN crystal; thirdly, the forward and reverse domain widths of the PPLN crystal are set to modulate the constant-volume leap-type coupling strength k12, k23 and k34; fourthly, the coupling strength k12, k23 and k34 are modulated in a Gaussian mode; fifthly, the light waves are converted, and a signal light source is converted into intermediate infrared wave band wavelength. By means of the method, a design modulation method of the coupling strength of tertiary cascade non-linear efficient frequency conversion is provided, the problem of multi-quasi-phase matching can be solved, and an intermediate infrared wave band laser source with high application value can be obtained.
Owner:SOUTH CHINA NORMAL UNIVERSITY
Hermite-Gauss mode beam splitter based on single polarization modulation device
The invention discloses an Hermite-Gauss mode beam splitter based on a single polarization modulation device. The splitter comprises a single polarization phase converter and a common-path polarization interference system, wherein the single polarization phase converter consists of two single polarization cylindrical lenses and only performs phase modulation on one of orthogonal polarization states. The planes of the two single-polarization cylindrical lenses are opposite and coaxially arranged, the curved surfaces of the lenses can be placed in a horizontal mode or a vertical mode, and the distance between the lenses meets the formula that d = 2sin (theta / 2) f. According to the common-path polarization interference system, two orthogonal polarization substrates are used for replacing twopaths of a traditional interferometer, and polarization projection is used for replacing path beam combination at an outlet. By changing the phase value and the placement mode of the single polarization phase converter, a phase difference directly related to horizontal or vertical parameters of the Hermite-Gauss mode is generated between two polarization components, different input modes finally appear from different channels by means of a common-path polarization interference system, and the purpose of distinguishing the HG modes is achieved.
Owner:XI AN JIAOTONG UNIV
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