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30results about How to "Gain Spectral Width" patented technology
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Wideband chaotic signal generation device with tunable central wavelength
ActiveCN107086904AGain Spectral WidthLongitudinal mode spacing is smallCladded optical fibreWavelength-division multiplex systemsFiber couplerSpectrum analyzer
The invention provides a wideband chaotic signal generation device with the tunable central wavelength. According to the generation device, the output of a weak resonant cavity Fabry-Perot laser WRC-FPLD firstly passes a first optical circulator OC1, and then is divided into two parts by a first optical coupler FC1; after being amplified by an erbium-doped fiber amplifier, one part is reflected by a tunable fiber bragg grating TFBG; the reflection light passes a polarization controller PC, a tunable attenuator VA, a second fiber coupler FC2 and the first optical circulator OC1, and then fed back to the weak resonant cavity Fabry-Perot laser WRC-FPLD; and the output of another part enters a detection system, wherein the detection system comprises a photoelectric detector FD, an electric spectrum analyzer and a spectrum analyzer. The polarization controller PC is used for controlling polarization states of feedback light, the variable attenuator VA is used for adjusting the feedback power of the feedback light and the power meter PM is used for detecting optical power of the feedback light.
Owner:SOUTHWEST UNIVERSITY
Broadband chaotic laser-based distributed optical fiber dynamic strain sensing device and method
ActiveCN108827175AImprove spatial resolutionAvoid crosstalkUsing optical meansData acquisitionPolarizer
The invention discloses a broadband chaotic laser-based distributed optical fiber dynamic strain sensing device, which comprises a broadband chaotic laser source (1), a 1*2 optical fiber coupler (2),a first polarization controller (3), a high-speed electro-optic modulator (4), a programmable optical delay generator (5), a first optical amplifier (6), an optical polarizer (7), an optical isolator(8), a sensing optical fiber (9), an optical circulator (10), a second optical amplifier (11), a semiconductor optical amplifier (12), a second polarization controller (13), a pulse signal generator (14), a broadband microwave signal source (15), a high speed data acquisition and analysis system (16), a photoelectric detector (17), and a tunable optical filter (18). The pulse signal generator is used to generate high speed pulse signals, synchronous control on the broadband microwave signal source, the semiconductor optical amplifier and the high speed data acquisition and analysis system is realized, and the measurement accuracy and the real-time performance of the sensing system are ensured.
Owner:TAIYUAN UNIV OF TECH
Quantum dot tunable external cavity laser (QD-TEC laser)
InactiveUS6862312B2Easy to controlGain Spectral WidthLaser optical resonator constructionLaser active region structureExternal cavity laserQuantum dot
A laser system includes a laser diode with a low dimensional nanostructure, such as quantum dots or quantum wires, for emitting light over a wide range of wavelengths. An external cavity is used to generate laser light at a wavelength selected by a wavelength-selective element. The system provides a compact and efficient laser tunable over a wide range of wavelengths.
Owner:NAT RES COUNCIL OF CANADA
High-concentration erbium aluminum co-doped amplifying optical fiber based on atomic layer deposition technology and manufacturing method thereof
InactiveCN102253446AImprove uniformityGood dispersionOptical fibre with multilayer core/claddingChemical vapor deposition coatingHigh concentrationOptical fiber amplifiers
The invention relates to a high-concentration erbium aluminum co-doped amplifying optical fiber based on an atomic layer deposition technology and a manufacturing method thereof, and belongs to the technical field of optical fibers. The amplifying optical fiber provided by the invention consists of a fiber core and a cladding, wherein an erbium aluminum mixed film deposited in an atomic layer is positioned in a fiber core structure. In the manufacturing method, the cladding and the partial fiber core material pure silica loose layer are deposited on a special modified chemical vapor deposition (MCVD) bar machine by adopting a chemical vapor deposition method; then Er2O3 and Al2O3 films are alternately deposited on the silica loose layer by utilizing the atomic layer deposition technology, so that an optical fiber preform is obtained; and finally, the optical fiber is drawn. The high-concentration erbium aluminum co-doped amplifying optical fiber based on the atomic layer deposition technology in the invention has the characteristics of good uniformity, high dispersivity, high doping concentration, wide gain spectrum, high amplifying efficiency, simple structure, low cost, easiness for industrial production and the like, and can be used for constructing an optical fiber laser, an optical fiber amplifier, an optical fiber sensor and the like.
Owner:SHANGHAI UNIV
Highly Power-efficient and Broadband Quantum Cascade Lasers
InactiveUS20110080930A1Gain Spectral WidthLarge gain spectrum widthLaser detailsLaser active region structurePower efficientBroadband
Owner:THE JOHN HOPKINS UNIV SCHOOL OF MEDICINE +1
Structure of wide gain spectrum quantum dot material for semiconductor optical amplifier
The invention discloses a structure of a wide gain spectrum quantum dot material for a semiconductor optical amplifier. The structure comprises an N-type gallium arsenide substrate, an N-type gallium arsenide buffer layer which grows on the N-type gallium arsenide substrate and is used for isolating defects on the substrate, an N-type gallium aluminum arsenide optical lower limiting layer which grows on the N-type gallium arsenide buffer layer and is used for limiting optical modes and current carriers, a self-organizing quantum dot active layer with multiple layers and different periods which grows on the N-type gallium aluminum arsenide optical lower limiting layer, a P-type gallium aluminum arsenide optical upper limiting layer which grows on the quantum dot active layer and is used for limiting the optical modes and current carriers, and a P-type gallium arsenide cap layer which grows on the P-type gallium aluminum arsenide optical upper limiting layer and is used for contacting an electrode. The wide gain spectrum is obtained by using inhomogeneous broadening characteristic of quantum dots with multiple layers and different sizes in the structure.
Owner:INST OF SEMICONDUCTORS - CHINESE ACAD OF SCI
GaN-based vertical cavity surface emitting light source with tunable light emitting wavelength
InactiveCN107863688AIncrease tuning rangeSimplify manufacturing difficultyLaser detailsLaser active region structureLight emitting deviceLarge range
The invention discloses a GaN-based vertical cavity surface emitting light source with tunable light emitting wavelength, and relates to an emitting light source. The vertical cavity surface emittinglight source is provided with an epitaxial layer; the epitaxial layer comprises a substrate, a lower dielectric film distributed Bragg reflector, an ITO current expansion layer, a p type Cr / Au electrode, an SiO<2> current limiting layer, p type GaN, a quantum dot active layer, n type GaN, an n type Cr / Au electrode and an upper dielectric film distributed Bragg reflector from the bottom up in sequence. By taking quantum dots of different dimensions as the active layer, the tunable gain characteristic is obtained; by combination with a resonance cavity effect, the output characteristic of the light emitting wavelengths tunable between strong coupling modes can be obtained; the light emitting wavelength tuning ranges range from green-yellow light to purple light, so that large-range tuning isrealized; and compared with the conventional method for manufacturing a tunable light emitting device, complex material growth and period manufacturing process are not needed in the invention, so that the technological process and the device manufacturing difficulty are greatly simplified, and the tuning range of the light emitting wavelengths is expanded.
Owner:XIAMEN UNIV
Optical waveguide article including a fluorine-containing zone
InactiveCN1628080AHigh gainHigh Rare Earth Ion ConcentrationGlass making apparatusOptical fibre with multilayer core/claddingHigh concentrationSilicate glass
An optical article including a core; at least one cladding layer; and a narrow fluorine reservoir between the core and the cladding layer. The fluorine reservoir has a higher concentration of fluorine than either the cladding layer or the core. One particular embodiment includes a core including a halide-doped silicate glass that comprises approximately the following in cation-plus-halide mole percent 0.25-5 mol % Al2O3, 0.05-1.5 mol % La2O3, 0.0005-0.75 mol % Er2O3, 0.5-6 mol % F, 0-1 mol % Cl.
Owner:3M INNOVATIVE PROPERTIES CO
Precise length matching method in optical fiber interference optical paths
InactiveCN102980599AIncrease spectral widthReduce the impactCoupling light guidesConverting sensor output opticallyOptical pathSignal-to-noise ratio (imaging)
The invention discloses a precise length matching method in optical fiber interference optical paths. The method is suitable for a Michelson type interference optical path and an M-Z type interference optical path. The Michelson type interference optical path or the M-Z type interference optical path is connected with light sources with filters with different spectral widths, interference fringes are observed through a charge coupled device (CCD), preliminary judgment is carried out, differences of optical lengths of the two optical paths are reduced, the interference contrast ratios of the two optical paths are detected through a photoelectric detector, by means of comparison of the contrast ratios, the relative length of the optical lengths of the two optical paths is precisely judged, and the optical lengths of the two optical paths are matched in the method of abrading the tail ends of optical fibers of the optical paths. According to the method, the two optical paths are precisely matched with each other in a micron-sized mode, the spectral widths of usable light sources in the interference optical paths are widened, phase noise of the light sources and influences of the noise in the optical paths on the whole interference system are reduced, and the signal-to-noise ration and sensitivity of an interference-type optical sensing system are significantly improved.
Owner:ZHEJIANG UNIV
Random distributed feedback fiber laser based on semiconductor optical amplifier
InactiveCN103825170AImprove conversion efficiencyShorten the lengthActive medium shape and constructionRayleigh scatteringGrating
The invention relates to a random distributed feedback fiber laser based on a semiconductor optical amplifier, belonging to the technical field of fiber lasers. The random distributed feedback fiber laser comprises an FC / APC (Ferrule Connector / Angled Polished Connector) optical fiber connector A, a fiber bragg grating, a semiconductor optical amplifier, a long-distance single mode fiber and an FC / APC optical fiber connector B, wherein the fiber bragg grating is used for providing strong feedback, the long-distance single mode fiber is used for providing random distributed rayleigh scattering feedback, and the semiconductor optical amplifier is used for providing gain amplification; and when the overall gain in the laser can counteract the total loss, the pumping threshold is reached and the random laser output is realized; and the driving current of the semiconductor optical amplifier is increased continuously to obtain stable laser output finally. The random distributed feedback fiber laser has the characteristics of low pumping threshold value, high conversion efficiency, simple structure and convenient operation, and can be suitable in the fields such as non-linear optics, remote optical fiber sensing, telecommunication and the like.
Owner:HANGZHOU GUANGLUO TECH
Semiconductor film inner packing layer enlarging optical fiber and its premade rod manufacturing method
ActiveCN1785860AHigh degree of inversionReduce decompositionGlass making apparatusBand gapDeposition process
The present invention relates to a semiconductor film internal cladding amplification optical fibre and its perform manufacture method. Said perform is formed from core rod, internal cladding and external cladding, the internal cladding is sandwiched between core rod and external cladding, the core rod is made up by using GeO2 doped quartz material, its refractive index is greater than that of pure quartz material of external cladding; the internal cladding is a film cladding and is made up by using active semiconductor direct band-gap material with amplification function, and the external cladding is made up by using pure quartz material. The manufacture method of perform includes the following steps: (a) adopting improved chemical gas-phase deposition process to make core rod; (b) making external cladding; (c) making film internal cladding; (d) adopting rod-inserting technique to make assembly and (e) reducing rod.
Owner:SHANGHAI UNIV
Ultra-wideband fluorescent quantum dot doped quartz amplification optical fiber and preparation method thereof
PendingCN113402161AReduced scattering lossLow insertion lossGlass making apparatusUltra-widebandRefractive index
The invention discloses an ultra-wideband fluorescent quantum dot doped quartz amplification optical fiber and a preparation method thereof, wherein a fiber core comprises an outer silicon dioxide loose layer and a middle doped layer, the silicon dioxide loose layer is made of high-purity silicon dioxide or a silicon dioxide material doped with certain concentration of high-refractive index GeO2, one or more quantum dots of PbS, PbSe and PbTe are doped in the doped layer, and Al2O3 and GeO2 are further doped in the doped layer. According to the invention, by utilizing the advantages of combination of an atomic layer deposition (ALD) technology and an in-situ annealing technology, semiconductor quantum dot materials of different sizes are combined with optical fiber preparation, so that the size of the quantum dots can be accurately regulated and controlled, and the deposited quantum dot materials are better in uniformity, high in density, controllable in concentration, good in dispersity and few in material defect; and the ultra-wideband fluorescent quantum dot doped quartz amplification optical fiber has the characteristics of wide fluorescence coverage, wide gain spectrum width, low overall loss, low noise coefficient and the like.
Owner:SHANGHAI UNIV
Tuning fork resonance enhanced double-optical comb multi-component gas detection system
PendingCN114018829AGain Spectral WidthHigh detection sensitivityMaterial analysis by optical meansSpectrographEngineering
The invention provides a tuning fork resonance enhanced double-optical comb multi-component gas detection system which comprises two optical comb laser sources, a polarization controller, a beam combiner, a half-wave plate, a photoacoustic gas cell, a focusing lens, a tuning fork receiver group, a multi-channel ADC (Analog to Digital Converter) unit and a frequency spectrograph. The invention discloses a tuning fork resonance enhanced double-optical comb multi-component gas detection method. The method comprises the steps that a coherent optical comb source with stable time frequency is adopted as a wide-band excitation source to excite various gas molecules to generate different photoacoustic signals; the frequency of the photoacoustic signals are determined by the beat frequency between the comb teeth of the two optical combs; different photoacoustic signals are subjected to resonance enhancement by using tuning forks with different characteristic frequencies in the tuning fork group, so that the purpose of improving the spectrum detection sensitivity of the double optical combs is finally achieved, and the problem of a non-contact gas detection technology in the aspect of high-sensitivity multi-component gas spectrum testing is solved.
Owner:STATE GRID SICHUAN ELECTRIC POWER CORP ELECTRIC POWER RES INST +2
Highly power-efficient and broadband quantum cascade lasers
InactiveUS8644358B2Gain Spectral WidthLarge gain spectrum widthLaser detailsLaser active region structurePower efficientStrong coupling
Owner:THE JOHN HOPKINS UNIV SCHOOL OF MEDICINE +1
Fiber laser and laser marking machine
InactiveCN105846296AReduce gainImprove stabilityActive medium shape and constructionPrintingResonant cavityOptoelectronics
The invention relates to the technical field of laser marking, and discloses a fiber laser, which at least includes a resonant cavity or a seed source connected in sequence, a primary optical path and a secondary optical path; the output isolator in the secondary optical path The return optical loss is greater than or equal to a predetermined return loss threshold; and / or the gain of the primary optical path is greater than or equal to a predetermined first gain threshold, and the gain of the secondary optical path is less than or equal to a predetermined second gain threshold . The present invention also provides a laser marking machine including the above laser. Thereby, the present invention can solve the problem of missing marking of the laser at high and low temperature, and can improve the stability and reliability of the machine at the same time.
Owner:MAXPHOTONICS CORP
Ultra-sensitive SF6 gas decomposition component detection method based on broadband dual-optical comb spectrum
ActiveCN112710628AIncrease the difficulty of simultaneous measurement of multiple absorption peaksGain Spectral WidthColor/spectral properties measurementsFrequency spectrumData acquisition
The invention provides an ultra-sensitive SF6 gas decomposition component detection system based on a broadband double-optical-comb spectrum. The ultra-sensitive SF6 gas decomposition component detection system comprises two optical combs, a beam combiner, an enhanced gas sample pool, a lens, a hollow optical fiber, a microphone, an audio amplifier and a data acquisition card. The invention discloses an ultra-sensitive SF6 gas decomposition component detection method based on a broadband double-optical comb spectrum. According to the system and method, the simultaneous measurement of a plurality of molecular absorption peaks can be realized through a double-optical comb beat frequency modulation mode on the basis of the characteristic of optical comb wide spectrum coverage, and the problem of point-by-point sweep frequency spectrum measurement of a traditional photoacoustic spectrum is solved; a photoacoustic effect and a hollow-core optical fiber are combined, so that the effective optical path and the action cross section of the interaction of light and molecules are increased, and the problem of low sensitivity of the traditional spectrum detection technology is solved; the method and system can be applied to SF6 gas decomposition component detection, and the detection capability of a power equipment fault gas detection device on complex multi-component gas can be effectively improved.
Owner:STATE GRID ELECTRIC POWER RES INST +1
Passive wavelength division multiplexing network optical fiber fault detection system and detection method thereof
ActiveCN110635842AGain Spectral WidthIdentify breakpointsMultiplex system selection arrangementsWavelength-division multiplex systemsVIT signalsPhase modulation
The invention discloses a passive wavelength division multiplexing network optical fiber fault detection system and a detection method thereof, and belongs to the technical field of passive wavelengthdivision multiplexing network optical fiber fault detection systems. The technical problem to be solved is to provide an improvement of the passive wavelength division multiplexing network optical fiber fault detection system structure and a detection method thereof. According to the adopted technical scheme solving the technical problems, the passive wavelength division multiplexing network optical fiber fault detection system structure comprises a chaotic laser generator, the signal output end of the chaotic laser generator is connected with the second input end of a first optical circulator, and the signal output end of the first optical circulator is connected with an optical isolator in series and then connected with the input end of a first optical fiber coupler; the first output end of the first optical fiber coupler is sequentially connected with a polarization controller and an optical attenuator in series and then is connected with the input end of a phase modulator, and theoutput end of the phase modulator is connected with the first input end of a first optical circulator; and the modulation interface of the phase modulator is also connected with a random signal generator. The system and the method are applied to optical fiber fault detection.
Owner:TAIYUAN UNIV OF TECH
Semiconductive thin film inner cladding amplifying optical fiber and manufacturing method thereof
InactiveCN1257429CConducive to the miniaturization of the structureEasy to useGlass making apparatusOptical light guidesFiberSemiconductor thin films
The invention relates to a novel nano-semiconductor film inner-clad amplifying optical fiber and a manufacturing method thereof, belonging to the technical field of optical fibers. The semiconductor film inner cladding amplifying optical fiber of the present invention is composed of a core, a film inner cladding and an outer cladding, and the semiconductor thin film inner cladding is sandwiched between the core and the outer cladding. The invention provides that the optical fiber prefabricated rod with outer cladding deposition, semiconductor thin film inner cladding deposition and fiber core deposition is directly manufactured on a special MCVD rod making machine by vapor deposition method, and then the optical fiber is drawn. The amplifier made of the nano-semiconductor thin film inner cladding amplifying fiber of the invention has the characteristics of strong integration, wide frequency, high gain, simple structure and the like.
Owner:SHANGHAI UNIV
Quantum wire laser and its preparation method
InactiveCN111276868BOvercoming the problem of only lasing a single wavelengthGain Spectral WidthLaser detailsLaser active region structureIndiumIndium arsenide
The invention belongs to the technical field of lasers, and in particular relates to a quantum wire laser and a preparation method thereof. The quantum wire laser of the present invention includes: a substrate, a buffer layer disposed on the substrate, an active region disposed on the buffer layer, and a top electrode disposed on the active region; wherein, the active region includes N+1 layer intervals layer and N layers of indium arsenide quantum wire layers, and the spacer layer and the indium arsenide quantum wire layer are arranged alternately; N is an integer greater than or equal to 1. Since the size distribution of the indium arsenide quantum wires arranged in the active region of the present invention is uneven, the energy level distribution of the indium arsenide quantum wires is also uneven, and the excited state of the larger size indium arsenide quantum wires is different from that of the smaller size ones. The ground state of the indium arsenide quantum wire overlaps, so that the obtained quantum wire laser has a very wide gain spectrum, and the simultaneous lasing effect of multiple wavelengths can be realized under the current injection drive.
Owner:SHENZHEN INSTITUTE OF INFORMATION TECHNOLOGY
A passive wave division replication network optical fiber failure detection system and its detection method
ActiveCN110635842BImplement fault detectionRealize fault discriminationMultiplex system selection arrangementsWavelength-division multiplex systemsFiber couplerIsolator
The present invention is a passive wavelength division multiplexing network optical fiber fault detection system and a detection method thereof, belonging to the technical field of passive wavelength division multiplexing network optical fiber fault detection systems; the technical problem to be solved is: to provide a passive wavelength division multiplexing network optical fiber fault detection system. The improvement of the structure of the optical fiber fault detection system and the detection method using the network; the technical scheme adopted to solve the technical problem is: including a chaotic laser generator, the signal output end of the chaotic laser generator is connected with the second input end of the first optical circulator The signal output end of the first optical circulator is connected in series with the optical isolator and then connected with the input end of the first fiber coupler; The input end of the modulator is connected, the output end of the phase modulator is connected with the first input end of the first optical circulator; the modulation interface of the phase modulator is also connected with a random signal generator; the invention is applied to optical fiber fault detection.
Owner:TAIYUAN UNIV OF TECH
Semiconductor film inner packing layer enlarging optical fiber and its premade rod manufacturing method
ActiveCN100357204CHigh degree of inversionReduce decompositionGlass making apparatusGas phaseRefractive index
The present invention relates to a semiconductor film internal cladding amplification optical fibre and its perform manufacture method. Said perform is formed from core rod, internal cladding and external cladding, the internal cladding is sandwiched between core rod and external cladding, the core rod is made up by using GeO2 doped quartz material, its refractive index is greater than that of pure quartz material of external cladding; the internal cladding is a film cladding and is made up by using active semiconductor direct band-gap material with amplification function, and the external cladding is made up by using pure quartz material. The manufacture method of perform includes the following steps: (a) adopting improved chemical gas-phase deposition process to make core rod; (b) making external cladding; (c) making film internal cladding; (d) adopting rod-inserting technique to make assembly and (e) reducing rod.
Owner:SHANGHAI UNIV
Distributed optical fiber dynamic strain sensing device and method based on broadband chaotic laser
The invention discloses a broadband chaotic laser-based distributed optical fiber dynamic strain sensing device, which comprises a broadband chaotic laser source (1), a 1*2 optical fiber coupler (2),a first polarization controller (3), a high-speed electro-optic modulator (4), a programmable optical delay generator (5), a first optical amplifier (6), an optical polarizer (7), an optical isolator(8), a sensing optical fiber (9), an optical circulator (10), a second optical amplifier (11), a semiconductor optical amplifier (12), a second polarization controller (13), a pulse signal generator (14), a broadband microwave signal source (15), a high speed data acquisition and analysis system (16), a photoelectric detector (17), and a tunable optical filter (18). The pulse signal generator is used to generate high speed pulse signals, synchronous control on the broadband microwave signal source, the semiconductor optical amplifier and the high speed data acquisition and analysis system is realized, and the measurement accuracy and the real-time performance of the sensing system are ensured.
Owner:TAIYUAN UNIV OF TECH
Quantum wire laser and preparation method thereof
InactiveCN111276868AOvercoming the problem of only lasing a single wavelengthGain Spectral WidthLaser detailsLaser active region structureIndiumIndium arsenide
The invention belongs to the technical field of lasers, and particularly relates to a quantum wire laser and a preparation method thereof. The quantum wire laser comprises a substrate, a buffer layerarranged on the substrate, an active region arranged on the buffer layer and a top electrode arranged on the active region, wherein the active region comprises N+1 spacer layers and N indium arsenidequantum wire layers, and the spacer layers and the indium arsenide quantum wire layers are alternately arranged; wherein N is an integer greater than or equal to 1. According to the invention, the indium arsenide quantum lines arranged in the active region are non-uniform in size distribution; according to the quantum wire laser, the excitation state of the indium arsenide quantum wire with a larger size is overlapped with the ground state of the indium arsenide quantum wire with a smaller size, so that the obtained quantum wire laser has a very wide gain spectrum, and the effect of simultaneous lasing of multiple wavelengths can be realized under the drive of current injection.
Owner:SHENZHEN INSTITUTE OF INFORMATION TECHNOLOGY
A Dissipative Soliton Laser in the 2 Micron Band
The invention discloses a dissipative soliton laser in 2 micron wave band, including pumping sources, wavelength division multiplexer, isolator, spectral filter, gain fiber, optical fiber polarizationcontroller, fiber polarization beam splitter and micro-nano fiber, the wavelength division multiplexer, isolator, spectral filter, gain fiber, optical fiber polarization controller, A lase resonant cavity is formed by connecte that optical fiber polarization beam splitter and the micro-nano optical fib in series, wherein the micro-nano optical fiber in the loop is more than one section, the diameter of the waist section of at least one section of the micro-nano optical fiber is 800 nm to 1600 nm, the length is 5 mm to 1 m, and the length of the waist section of the at least one section of themicro-nano optical fiber satisfies L1: (L-L1) = 1: 3.5 to 50. Where L1 denotes the length of the waist portion of the micro-nano optical fiber and L denotes the sum of the lengths of all the opticalfibers in the loop. The output spectrum of the invention has a wide spectrum of tens of nanometers and a flat spectrum, and solves the technical problem that the prior art has not solved for a long time.
Owner:ZHEJIANG UNIV
Brillouin microwave photon filter bandwidth expansion method and system
ActiveCN114095091AGain Spectral WidthWaveform controllableElectromagnetic transmissionBrillouin gainIntensity modulation
The invention provides a Brillouin microwave photon filter bandwidth expansion method and system, and the method comprises the following steps: generating a plurality of optical carriers which are respectively used as the carriers of a plurality of Brillouin shunt pump light; taking the plurality of electric signals as external modulation driving electric signals for broadening the plurality of Brillouin shunt pump light; converting the plurality of electric signals into a plurality of optical signals; combining multiple paths of pump light signals into one path through a coupler; outputting an electric signal within the frequency range of the Brillouin filter, and performing intensity modulation to obtain a sweep-frequency optical signal to be measured; S6, enabling the combined pump light signal to pass through a section of gain optical fiber to generate a Brillouin gain spectrum after bandwidth expansion, and carrying out amplification and filtering processing on the signal in a bandwidth range; detecting the electric signal when the pump light signal exists or not to obtain the waveform of the Brillouin microwave photon filter; and optimizing the waveform of the Brillouin microwave photon filter. According to the invention, the Brillouin microwave photon filter with adjustable bandwidth in a large range can be realized.
Owner:SHANGHAI JIAO TONG UNIV
Scaling high-energy pulsed solid-state lasers to high average power
ActiveUS20200076150A1Reduced amplifier gainReducing laser pulse energyActive medium materialOptical devices for laserFluorescenceEngineering
Techniques are provided for scaling the average power of high-energy solid-state lasers to high values of average output power while maintaining high efficiency. An exemplary technique combines a gas-cooled-slab amplifier architecture with a pattern of amplifier pumping and extraction in which pumping is continuous and in which only a small fraction of the energy stored in the amplifier is extracted on any one pulse. Efficient operation is achieved by propagating many pulses through the amplifier during each period equal to the fluorescence decay time of the gain medium, so that the preponderance of the energy cycled through the upper laser level decays through extraction by the amplified pulses rather than through fluorescence decay.
Owner:LAWRENCE LIVERMORE NAT SECURITY LLC
Structure design of active region of a multi-wavelength gan-based vertical cavity surface emitting laser
ActiveCN107645123BEasy to detectGain Spectral WidthLaser detailsLaser active region structureVertical-cavity surface-emitting laserResonant cavity
The invention relates to the field of nitride semiconductor vertical-cavity surface-emitting lasers, and discloses an active region structural design method of a multi-wavelength GaN-based vertical-cavity surface-emitting laser. The active region structural design method comprises the step of designing laser cavity length, quantum dot positions and quantum dot sizes. Through the precise design ofthe sizes of multi-layer quantum dots and spatial positions thereof in a resonant cavity, the maximum coupling between light emitting of the quantum dots of different sizes and corresponding cavity modes and a standing wave optical field in the cavity is realized, thus a plurality of laser modes can obtain large enough gain simultaneously and stable multi-wavelength laser output is realized finally. Meanwhile, the invention further provides a specific device structure of the multi-wavelength GaN-based vertical-cavity surface-emitting laser manufactured by adopting the active region, and application thereof.
Owner:EAST CHINA NORMAL UNIV
Structure of wide gain spectrum quantum dot material for semiconductor optical amplifier
The invention discloses a structure of a wide gain spectrum quantum dot material for a semiconductor optical amplifier. The structure comprises an N-type gallium arsenide substrate, an N-type gallium arsenide buffer layer which grows on the N-type gallium arsenide substrate and is used for isolating defects on the substrate, an N-type gallium aluminum arsenide optical lower limiting layer which grows on the N-type gallium arsenide buffer layer and is used for limiting optical modes and current carriers, a self-organizing quantum dot active layer with multiple layers and different periods which grows on the N-type gallium aluminum arsenide optical lower limiting layer, a P-type gallium aluminum arsenide optical upper limiting layer which grows on the quantum dot active layer and is used for limiting the optical modes and current carriers, and a P-type gallium arsenide cap layer which grows on the P-type gallium aluminum arsenide optical upper limiting layer and is used for contacting an electrode. The wide gain spectrum is obtained by using inhomogeneous broadening characteristic of quantum dots with multiple layers and different sizes in the structure.
Owner:INST OF SEMICONDUCTORS - CHINESE ACAD OF SCI
Precise length matching method in optical fiber interference optical paths
InactiveCN102980599BGain Spectral WidthImprove signal-to-noise ratioCoupling light guidesConverting sensor output opticallyPhase noiseOptical path length
Owner:ZHEJIANG UNIV
Scaling high-energy pulsed solid-state lasers to high average power
ActiveUS11296478B2High value of saturation fluenceIncrease valueLaser arrangementsActive medium materialFluorescenceComputational physics
Techniques are provided for scaling the average power of high-energy solid-state lasers to high values of average output power while maintaining high efficiency. An exemplary technique combines a gas-cooled-slab amplifier architecture with a pattern of amplifier pumping and extraction in which pumping is continuous and in which only a small fraction of the energy stored in the amplifier is extracted on any one pulse. Efficient operation is achieved by propagating many pulses through the amplifier during each period equal to the fluorescence decay time of the gain medium, so that the preponderance of the energy cycled through the upper laser level decays through extraction by the amplified pulses rather than through fluorescence decay.
Owner:LAWRENCE LIVERMORE NAT SECURITY LLC
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