117 results about "Supercontinuum" patented technology

The invention discloses an underwater navigation positioning method and system based on supercontinuum laser intensity correlation. The system comprises a master control system, a transmitting end underwater base station and a receiving end underwater carrier. The method comprises the following steps: firstly, a main control system generates a super-continuum laser signal with pseudo-random code information, the super-continuum laser signal is separated into optical signals of different wavelength channels through a light splitting module, and the optical signals are respectively sent to underwater base stations uniquely corresponding to the wavelength channels and are emitted; then the underwater carrier receives optical signals from a plurality of base stations, identifies a signal source base station according to wavelength identification, performs correlation operation with a locally copied pseudo-random code sequence, determines signal arrival time TOA and calculates a pseudo-range; and finally, resolving the three-dimensional coordinate and local clock error result of the underwater carrier by combining the pseudo-ranges, absolute positions and transmission delays of the underwater carrier and the at least four base stations. According to the invention, high-precision and high-robustness absolute positioning of the underwater environment is realized, and the reliability of long-time positioning and navigation of the underwater robot is enhanced.

A system for generating a supercontinuum comprising a frequency comb generator and a waveguide structure coupled to the frequency comb generator. The waveguide structure comprises distinct sections: an untapered input section with specified first cross-sectional outer dimensions, a down-taper transition section leading to a taper waist section with second cross-sectional outer dimensions that are smaller than the first cross-sectional outer dimensions, followed by an up-taper transition section extending to an untapered output section which reverts to third cross-sectional outer dimensions that are larger than the second cross-sectional outer dimensions.

A microstructured optical fiber including a core region and a cladding region which surrounds the core region. The cladding region includes a plurality of cladding features within a cladding background material, wherein the cladding region includes an inner cladding region with at least one inner ring of cladding features and an outer cladding region with at least three outer cladding rings of outer cladding features. The inner cladding features have a first characteristic diameter and the outer cladding region includes a plurality of outer cladding features having a characteristic diameter smaller than the first characteristic diameter. The first characteristic diameter is at least about 10% larger than an average diameter of the outer cladding features and the core region has a diameter of at least about 2 μm. A cascade optical fiber with at least one fiber as described, as well as a source of optical supercontinuum generation.

A system for generating a visible-to-mid-infrared frequency comb, including an all polarization-maintaining fiber-based frequency comb module and an optical frequency comb spectral expansion module. The all polarization-maintaining fiber-based frequency comb module is configured to generate a laser with evenly spaced and coherent frequencies and spectral lines. The optical frequency comb spectral expansion module is configured to perform spectral expansion on the laser to output the visible-to-mid-infrared frequency comb. The optical frequency comb spectral expansion module includes an amplifier, a 90:10 beam splitter, a first all polarization-maintaining compression fiber, a second all polarization-maintaining compression fiber, a 1100 nm-2350 nm supercontinuum unit and a 500 nm-1100 nm supercontinuum unit. A circuit of a semiconductor laser diode unit is configured to control output of the 1100 nm-2350 nm laser.

The invention discloses a near-infrared wide-spectrum pulse light source generator, belongs to the technical field of laser light source manufacturing, and aims to solve the problems of complex system structure and high cost due to the fact that a supercontinuum laser generates supercontinuum through multi-stage power amplification in the prior art. The device is composed of a first semiconductor pump laser, a first wavelength division multiplexer, a first gain optical fiber, a first filter, a first dispersion compensation optical fiber, a first high-nonlinearity optical fiber, a first isolator, an optical fiber coupler, a second semiconductor pump laser, a second wavelength division multiplexer, a second gain optical fiber, a second filter, a second dispersion compensation optical fiber, a second high-nonlinearity optical fiber and a second isolator. According to the invention, the characteristic of high mode-locked pulse energy of the Mmyshev oscillator is utilized, multi-stage power amplification is not needed, and the super-continuum spectrum can be directly generated, so that the system structure is simplified, and the cost is reduced; the laser light source can be applied to multiple fields of laser sensing, photoelectric countermeasure, remote sensing detection, optical imaging and the like.

A light source includes a mode-locked laser; a beam splitter that branches the femtosecond optical pulse train; a CW solid-state laser; a first beam combiner that outputs one side of the femtosecond optical pulse train on the same axis; a secondary nonlinear optical element that outputs a difference frequency generation and conversion optical pulse train from either a continuous wave or a femtosecond optical pulse train; an amplifier that amplifies the difference frequency generation and conversion optical pulse train; a polarization-maintaining all normal dispersion high nonlinear fiber that converts the other femtosecond optical pulse train into a supercontinuum optical pulse train; a first dispersion medium that converts the supercontinuum optical pulse train into a pulse width that is approximately the same as the difference frequency generation and conversion optical pulse train; and a second beam combiner that multiplexes and outputs the difference frequency generation and conversion optical pulse train and the supercontinuum optical pulse train.

The present invention discloses a device for generating an ultraviolet supercontinuum light source based on a subwavelength optical fiber, comprising: a pump light source, a first optical fiber coupler, and a subwavelength optical fiber sequentially arranged on the same optical path; the subwavelength optical fiber outputs an ultraviolet supercontinuum. The present invention also discloses a method for generating an ultraviolet supercontinuum light source based on a subwavelength optical fiber, comprising: emitting an optical pulse with a non-chirped sech-shaped waveform, a central wavelength of 400 nm, an initial pulse width ranging from 250 to 450 fs, and a pulse peak power of kilowatt level through a pump light source; the optical pulse is incident on the subwavelength optical fiber through the first optical fiber coupler for dispersion and nonlinear effects, and the subwavelength optical fiber outputs an ultraviolet supercontinuum. The present invention can generate an ultraviolet supercontinuum light source, solving the technical problem that it is difficult to extend the supercontinuum to the short wavelength band.

This invention relates to the field of spectroscopic measurement technology, and particularly to a measurement system and method for measuring the concentration of high-temperature combustion gases in aero-engines. The measurement system includes a supercontinuum laser source, a first collimating mirror, a second collimating mirror, a spectrometer, and a computer. The measurement method includes acquiring the actual transmittance spectrum of the high-temperature combustion gases; calculating the theoretical transmittance spectrum of the high-temperature combustion gases; constructing constraints; fitting the actual transmittance spectrum and the theoretical transmittance spectrum into the constraints; and calculating the concentration of the high-temperature combustion gases. The measurement system has a lightweight structure, requiring only holes for mounting the laser emission and absorption devices on the inner wall of the aero-engine casing. The measurement method uses a supercontinuum laser source, which, compared to ordinary lasers used in active gas detection, offers better spatial coherence, a wider spectral adjustment range, and higher intensity, enabling the detection of more types of gases. The method uses a multi-band combustion gas absorption model to solve for the temperature of the high-temperature combustion gases, improving the accuracy of the concentration calculation.

The invention discloses an on-chip super-continuum spectrum light source based on a cascaded polarized ferroelectric material and a design method thereof. The pump light source is used for providing pump light; the pump light enters the super-continuum spectrum generation waveguide; the super-continuum spectrum generation waveguide meets the requirements that the group velocity dispersion is close to 0 under the wavelength of the pump light, the group velocity mismatch of the wavelength of the pump light and the wavelength of the frequency doubling light is close to 0, and the polarization period of the super-continuum spectrum generation waveguide meets the phase matching of frequency doubling. The polarization period of the super-continuum spectrum expansion waveguide changes along the propagation direction, and the super-continuum spectrum expansion waveguide outputs a super-continuum spectrum; the conical transition waveguide is used for connecting the super-continuum spectrum generation waveguide and the super-continuum spectrum expansion waveguide and eliminating mode mismatch between the super-continuum spectrum generation waveguide and the super-continuum spectrum expansion waveguide. The system has the advantages of low cost, high integration level and wide spectrum coverage, and is suitable for the fields of environmental monitoring, medical diagnosis, spectral analysis and the like.

The present disclosure relates to a supercontinuum generation system, device and equipment, the supercontinuum generation system comprising: a femtosecond pulse generation module and a spectrum expansion module. The input end of the femtosecond pulse generation module is used to receive a femtosecond seed pulse, and the femtosecond pulse generation module is used to perform time domain shaping, amplification or reduction and compression on the femtosecond seed pulse to generate a femtosecond pulse. The spectrum expansion module comprises a first optical fiber segment, a second optical fiber segment and a self-reference interference unit. The first optical fiber segment is used to perform high-order soliton self-compression on the femtosecond pulse. The second optical fiber segment is used to broaden the spectrum of the femtosecond pulse under near-zero dispersion conditions to generate a first supercontinuum by frequency doubling. The self-reference interference unit is used to align the first long wave and the first short wave of the first supercontinuum in the time domain. After the first short wave is coaxial with the first long wave after frequency doubling, the self-reference interference unit outputs a target supercontinuum. Thus, the present disclosure realizes that the output supercontinuum has high flatness and high coherence.

A kind of mid-infrared supercontinuum light source of spatial light structure, comprising: pump source, for generating pump light;Collimating lens, for collimating pump light, output parallel light;Grating pair, by two grating parallel placement, for according to frequency to the light input to grating pair Spectral splitting is realized and the optical path of each frequency light is changed, output transmission light to roof prism;It is also used for the light that returns to grating pair from roof prism by original road to be compounded and pulse compression is realized, output compressed light to reflector;Roof prism, for the light that transmits grating pair is reflected again and transmits grating pair;Reflector, for reflecting the compressed light;Focusing lens, for focusing the compressed light reflected by the reflector;Fluoride fiber, the compressed light after focusing of focusing lens is spatially coupled into fluoride fiber at focal point, output mid-infrared supercontinuum laser.The utility model discloses in spatial light coupling system using grating pair compression pulse, the further widening of supercontinuum is realized.

Disclosed is an all-normal-dispersion (ANDi) based supercontinuum (SC) system, comprising a pulsed light-source-device configured to generate a first train of light-pulses, wherein each of the light pulses is defined in a first frequency-domain, and wherein each of the light-pulses of the first train of light-pulses is defined by a first center-wavelength, the ANDi-based SC system further comprising an ANDi-fiber optically coupled to the pulsed light-source-device and configured to receive the light-pulses of the first train of light-pulses, wherein the ANDi-fiber is a hollow core fiber having only normal dispersion between an absolute value of 0 ps / nm / km and 1500 ps / nm / km in an ANDi-wavelength range, whereby the hollow core fiber is configured to generate a SC spectrum based on only the normal dispersion of the hollow core fiber.

The utility model discloses a pulse modulation circuit of an ultra-wideband super-continuum fiber laser, belongs to the technical field of ultra-wideband super-continuum fiber lasers, and solves the problem that the phase noise floor of a clock circuit is directly lifted due to the fact that power supply ripple coupling and LDO filter network efficiency is insufficient, for example, the output capacitance ESR is too high or a pi-type filter is missing. Comprising an input filtering module, a low dropout linear regulator module, a pi-type filter module, a clock power supply distribution module and a grounding system module. According to the utility model, high-frequency ripple filtering, voltage ripple depth suppression and residual noise absorption are carried out on power supply output through a three-stage sequential filtering framework, and finally, super-stable power supply with a phase noise base lower than-152dBc / Hz and 1kHz offset is provided for the clock circuit, so that the time sequence precision of super-continuum spectrum laser pulses is ensured.

A photonic platform (e.g., a photonic chip) is described which can include integrated components such as laser cavities, modulators, optical multiplexers / demultiplexers, photodiodes, and supercontinuum generators that are connected using optical waveguides and splitters / combiners to perform two-way optical time transfer. Integrating various combinations of these optical components onto the same photonic chip (e.g., photonic integrated circuit (PIC)) can reduce the size of the device, reduce noise, improve assembly by reducing the amount of fiber connections, and the like. A digital processing system is also described for performing two-way optical time transfer.

The application discloses a cold molecule optical association device based on supercontinuum fiber, and relates to the technical field of laser physics, which comprises the following components: an optical dipole trap laser (1) is used for outputting high-power laser to form an optical dipole trap; the laser is shot into a first double-color mirror (9); a titanium-sapphire laser (2) and a semiconductor laser (3) are used for emitting different molecular association beams; the association beams are combined by a polarization beam splitter (4) and then combined with a detection laser (5) to form a detection light beam; the four light beams are combined by the first double-color mirror (9) and then coupled into the same supercontinuum fiber (7) through an aspheric mirror (6); the four light beams output by the supercontinuum fiber (7) are expanded by a set of lens groups (10) and then focused on an atomic group (12) in a vacuum cavity (8) through an achromatic lens (11); and the number of atoms is obtained. The application can not only ensure complete coincidence of two light beams but also realize coincidence of multiple light beams, and the experimental operation is simple. The application further solves the above technical problems in the prior art.

An imaging system (400) includes an imager (410) having first and second light sensors (465, 467), the first light sensor (465) being configured to record light in a first wavelength range and the second light sensor (467) being configured to record light in a second wavelength range, an alignment mechanism (440) configured to be attached to the imager (410), an illumination source (450) configured to generate a supercontinuum light beam, and a light shaping mechanism (452) configured to transform the supercontinuum light beam into a linear strip of light (450B). The alignment mechanism (440) is configured to adjust a position of the light shaping mechanism (452) so that a back scattered light (710), resulting from a scattering of the linear strip of light (450B) from a target (620), has an intensity above a given minimum for each of the first and second light sensors (465, 467).

The discovery of a clear correlation between the Anderson localization length and the dispersion properties of highly localized TALOF modes allowed us to demonstrate that the zero dispersion wavelength can be tuned over more than 300 nm within the same fiber by selected excitation of specific modes. This enabled apparatus and methods for generating tunable, multi-octave-spanning supercontinuum (SC) spectra in a bandwidth from 460 nm to 1750 nm. Associated applications are also presented.

The invention provides a cross-octave on-chip super-continuum spectrum generation method for near-zero dispersion engineering, and the method employs the excellent third-order nonlinear characteristic of a Z-cut film lithium niobate material doped with 5% MgO, achieves the integrated dispersion characteristic of near-zero distribution through the optimization design of the geometric dimension of an optical waveguide. Secondly, by means of a low energy barrier between the pump wave and the dispersion wave, cross-octave super-continuum spectrum broadening and flat broadband short-wave band dispersion wave can be achieved no matter whether the pump wavelength is in a normal group velocity dispersion condition or an abnormal group velocity dispersion condition; finally, the experimental test result further verifies the effectiveness of the designed waveguide structure, and an on-chip super-continuum spectrum of which the 30dB spectral range covers one octave and flat short-wave band dispersion waves of which the 3dB spectral bandwidth reaches 70.1 THz and 77.3 THz are respectively obtained.

The application discloses a device and method for detecting energy carrier dissipation behavior in thermal insulation materials, which comprises: a laser emission module for emitting a laser beam; a first filter for separating the laser beam; a supercontinuum beam forming device for processing the second laser beam; a phase delay line for phase delaying the first laser beam; the wavelength range of the supercontinuum beam is wider than that of the pump beam; a second filter for combining the supercontinuum beam and the pump beam, and then irradiating the surface of the sample and being transmitted by the sample; a photodetector collects the transmitted beam; a controller controls the delay time change of the phase delay line once, receives the transmitted beam once, processes each transmitted beam, obtains the corresponding time-resolved broadband spectral coherent anti-Stokes shift, and extracts the longitudinal optical phonon dephasing process of the sample according to the anti-Stokes shift. Multimodal coherent phonon detection of the sample is realized.

The invention discloses a high-efficiency visible light super-continuum spectrum generation method and device based on a green light pumping gradient refractive index multimode fiber, and belongs to the technical field of fiber laser. According to the method, a pulse green laser is adopted as a pumping source, the pulse green laser is coupled into a parameter-optimized multimode optical fiber with the gradient refractive index, and the gradient refractive index is obtained by exciting the synergistic effect of nonlinear effects such as geometric parameter instability and light beam self-cleaning which are unique in the optical fiber. And the high-flatness super-continuum spectrum covering the whole visible light wave band is directly and efficiently generated. The defects that a traditional photonic crystal fiber scheme is low in conversion efficiency and poor in flatness in the visible light wave band are overcome, the range and shape of an output spectrum can be accurately regulated and controlled by flexibly designing the fiber core radius, the numerical aperture and the length of the fiber, and meanwhile it is guaranteed that an output light beam is close to the diffraction limit through the light beam self-cleaning effect. According to the scheme, the system is simple in structure and high in robustness, and a novel, reliable and practical way is provided for achieving a high-performance visible light super-continuum spectrum light source.

The present invention belongs to the field of laser measurement, and specifically relates to a system and method for generating an optical frequency comb in the visible to mid-infrared band. The system comprises a fully polarization-maintaining fiber frequency comb module and a comb spectrum expansion module. The fully polarization-maintaining fiber frequency comb module is used to generate a broadband laser with uniform and coherent frequency and spectral line spacing. The comb spectrum expansion module is used to expand the spectrum of the frequency-locked broadband coherent light source to achieve the output of an optical frequency comb in the visible to mid-infrared band. The comb spectrum expansion module comprises an amplifier B, a 90:10 beam splitter, a fully polarization-maintaining compression fiber B, a fully polarization-maintaining compression fiber C, an 1100-2350nm supercontinuum unit, and a 500-1100nm supercontinuum unit. The output and shutoff of the 1100-2350nm near-infrared to mid-infrared laser are achieved by switching the circuit of the semiconductor laser diode unit C.

To provide a system for generating a supercontinuum with a waveguide structure that facilitates efficient light coupling, enables the generation of a flat and broad supercontinuum spectrum, and is robust against damage from high-repetition-rate pump sources.SOLUTION: A system (16) comprises a frequency comb generator (15) and a waveguide structure (9) coupled to the frequency comb generator (15). The waveguide structure (9) comprises different sections: an untapered section (1) which has predetermined first cross-sectional outer diameters (8, 8a, 8b), a down tapered transition section (2) leading to a tapered waist section (3) having second cross-sectional outer diameters (7, 7a, 7b) smaller than the first cross-sectional outer diameters (8, 8a, 8b), Followed by an up-taper transition section (4) extending to an untapered output section (5) which reverts to third cross-sectional outer diameters (6, 6a, 6b) larger than the second cross-sectional outer diameters (7, 7a, 7b).SELECTED DRAWING: Figure 3

The application discloses a kind of multispectral laser imaging radar systems based on APD array and supercontinuum laser, wavelength covering 450~2400nm supercontinuum laser is used as light source, the continuous laser output is collimated after being collimated by laser collimating system, multi-band fast selection is realized by acousto-optic tunable filter, and uniform emission is completed in combination with variable-focus laser emission optical system;Then, large field of view receiving optical system is constructed, and the echo signal is detected by APD array detector to realize multi-pixel parallel detection, the echo intensity data corresponding to different wavelengths are acquired, and the multispectral reflection information of target is formed.Finally, the laser emission time and APD array receiving time are accurately synchronized, based on time-of-flight ranging principle, the high-precision space-time information of target point cloud data and multispectral information is synchronously acquired.The application realizes the high spectral information acquisition accuracy while breaking through the efficiency and resolution limit of traditional single-point imaging mode.

The application discloses a super-surface-based continuous-order-variable perfect vortex beam generator, relates to the technical field of micro-nano optics, and aims at solving the problems of non-continuous multi-order variable order and complex variable order mode in the prior art.The generator comprises a forwardly arranged super-surface one and a super-surface two;the two super-surfaces each comprise a SiO2 substrate and a micro-nano structure array;the micro-nano structure array is composed of a plurality of cylindrical monocrystalline silicon with different diameters, the period of adjacent cylindrical monocrystalline silicon is a subwavelength size, and the layout of the plurality of cylindrical monocrystalline silicon with different diameters is formed by a phase formula.The two super-surfaces can change the relative rotation angle, thereby providing additional vortex phases with different orders for a light beam, and a perfect vortex beam with continuous variable order can be generated by using only two super-surfaces; and the application has simple structure and can increase the stability of the light beam to a certain extent.

A broadband radiation source for generating output broadband radiation is disclosed, comprising a plurality of supercontinuum generating stages arranged in series, each of the supercontinuum generating stages comprising a respective non-linear generating element. The plurality of supercontinuum generation stages includes at least a first supercontinuum generation stage and a second supercontinuum generation stage, the second supercontinuum generation stage after the first supercontinuum generation stage in the series. A damage tolerance of a first non-linear generating element included within the first supercontinuum generating stage is greater than a damage tolerance of at least a second non-linear generating element included within the second supercontinuum generating stage.

The application discloses a kind of optical fiber LMR sensing probe systems based on double film layer structure, by supercontinuum spectrum light source, Y type optical fiber bundle, double film layer optical fiber LMR sensing probe, optical fiber spectrometer and host computer software composition;The double film layer optical fiber LMR sensing probe is sequentially removed by inside to outside cladding large core diameter multimode optical fiber, low refractive index matching layer, loss mode excitation layer, solve the LMR spectrum signal cross talk problem by TE / TM polarized light excitation, on spectrum, as TE / TM polarized light excitation LMR resonance wavelength does not affect each other, thus produce double resonance effect.The double film layer optical fiber LMR sensing probe system proposed in the application not only realizes the substantial improvement of detection precision, and double resonance sensing result can be verified each other, further guarantee the reliability of experimental result.

The application discloses a method for inducing supercontinuum local dispersion wave generation in a waveguide. The method is embedding a grating structure with a limited length in an optical waveguide structure. The grating structure realizes periodic modulation of the effective refractive index of the waveguide, so as to induce supercontinuum local dispersion wave generation. The wavelength and intensity of the dispersion wave can be controlled by changing the period length, modulation depth, period number and other parameters of the grating structure. The method for inducing supercontinuum local dispersion wave generation in a waveguide can accurately control and realize supercontinuum spectrum power promotion at any specified wavelength, so as to provide a wider space for the practical application of the supercontinuum light source.

This invention discloses a high-power, broadband, tunable long-wavelength mid-infrared femtosecond laser generation device and method. The laser beam is split into a first beam and a second beam. The first beam pumps a first YAG crystal to generate a first supercontinuum, from which a signal light of a predetermined wavelength is selected. The signal light undergoes at least two cascaded optical parametric amplification stages to generate a high-power mid-infrared pump light. The second beam pumps a second YAG crystal to generate a second supercontinuum covering the long-wavelength infrared band as a seed light. This seed light is then incident on a BGGSe crystal for optical parametric amplification. Using a 1.5μm high-power femtosecond laser as the pump source, combined with the BGGSe nonlinear crystal for optical parametric amplification, the wide transmission range and high nonlinear coefficient of the BGGSe crystal are effectively utilized. Phase matching in the 6–18μm band can be achieved under 1.5μm pumping conditions, thereby obtaining a broadband, high-power, femtosecond-level laser output covering the long-wavelength mid-infrared band.

A system (12) for generating supercontinuum pulsed emission having a substantially flat spectrum, the system comprising: a fiber mode-locked oscillator (1) comprising a laser cavity (2); an amplifier (10); a non-linear optical fiber (11); the laser cavity comprises a Fiber Bragg Grating element (5) and a Semiconductor Saturable Absorber Mirror (8) configured to act as first and second mirrors respectively, the Fiber Bragg Grating element (5) having: a bandwidth between 3 nm and 15 nm, a reflectivity between 10 – 50%, and a dispersion value such that the total dispersion of the laser cavity is in the anomalous dispersion regime.

The utility model relates to the field of ultrafast lasers, and provides a tunable low-repetition-frequency optical fiber optical frequency comb light source. Comprising an all-polarization-maintaining ultrafast fiber laser seed source, a fiber pre-amplification stage module, a fiber main amplification stage module, a grating pair dispersion matching module, a super-continuum spectrum generation module and an f-2f self-reference detection module which are sequentially arranged along a light path. The full polarization-maintaining ultrafast fiber laser seed source is used for outputting continuously tunable signal light with low repetition frequency; the optical fiber pre-amplification stage module and the optical fiber main amplification stage module are used for carrying out self-similarity amplification and power amplification on the input signal light in sequence; the grating pair dispersion matching module is used for performing dispersion matching on the amplified signal light; the super-continuum spectrum generation module is used for coupling the signal light subjected to dispersion matching into a high-nonlinearity optical fiber to generate a super-continuum spectrum light source; and the f-2f self-reference detection module is used for measuring the super-continuum spectrum light source to obtain a light frequency comb with low repetition frequency.