139results about "Laser using scattering effects" patented technology

Embodiments of the present disclosure comprise an optical amplifier system, with the system comprising an erbium-doped fiber amplifier comprising a C band EDFA configured to generate C band light, and an L band EDFA configured to generate L Band light. A Raman amplifier comprising a fiber span may be pumped using a backward pump light.

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.

A pump light generation unit of an optical amplifier pumping device outputs pump light with a single wavelength or a plurality of wavelengths from a plurality of output ports. A pump light multiplexing unit polarization-multiplexes or wavelength-multiplexes the plurality of pieces of pump light which has been output from the pump light generation unit. A polarization scrambler collectively polarization-scrambles the polarization-multiplexed or wavelength-multiplexed pump light which has been output from the pump light multiplexing unit and outputs the polarization-scrambled pump light to an optical waveguide for pump light. The optical waveguide for pump light inputs the pump light which has been polarization-multiplexed or wavelength-multiplexed by the pump light multiplexing unit to the pump light superimposition unit. A pump light superimposition unit multiplexes the polarization-multiplexed or wavelength-multiplexed pump light and signal light. A pump light output port superimposes the pump light on the signal light by outputting the pump light from the pump light superimposition unit to the gain medium so that the pump light propagates in the same direction as the signal light.

The light source includes a linear accelerator for accelerating electron bunches to relativistic energies. The light source further includes a first grating downstream of the linear accelerator, which is positioned so that electron bunches pass through it to produce a diffraction pattern. The light source further includes an emittance exchange device downstream of the first grating, which rotates the diffraction pattern in a direction substantially parallel to the propagation direction of the electron bunches. The light source further includes a laser that generates light pulses. The light source is configured such that the light pulses from the laser interact with the electron bunches in an overtaking geometry at an interaction point downstream of the emittance exchange device, while the diffraction pattern is substantially parallel to the propagation direction of the electron bunches to produce light via inverse Compton scattering.

Systems and methods for a narrow linewidth squeezed state light generator. In certain embodiments, a system includes a pump optical signal source configured to emit a pump optical signal at a first frequency. Further, the system includes a resonator, wherein the pump optical signal is coupled to propagate in a first direction within the resonator. Additionally, the first frequency is at a first resonant frequency of the resonator and stimulated Brillouin scattering (SBS) within the resonator generates an SBS optical signal having a second frequency at a second resonant frequency of the resonator to propagate in a second direction opposite the first direction within the resonator. Also, the SBS optical signal generates squeezed optical signals through spontaneous four-wave mixing. Moreover, the system includes an output optical transmission media configured to output the squeezed optical signals generated within the resonator.

The invention belongs to the technical field of optics, and relates to a vortex laser capable of regulating spiral chirality. The invention aims to solve the problem that single chiral output cannot be realized due to degeneration of a + / -l topological charge vortex mode in a resonant cavity in the prior art. The vortex laser comprises a pumping source, a gain crystal, a concave mirror, an output coupling mirror and an adjustable scattering sheet arranged in a cavity, a non-periodic SiO2 nano-particle film is arranged on the surface of the scattering sheet, the transverse position of the scattering sheet is adjusted through a two-dimensional translation platform, mode symmetry is broken through differential loss generated by interaction of + l and-l vortex light beams and a random scattering structure, and active, continuous and reversible regulation and control of spiral chirality are achieved. The output coupling mirror is provided with a central micropore to select vortex mode oscillation and output, and astigmatism conversion and CCD detection are matched to accurately judge the chirality of an output light beam. The scheme is compact in structure, high in stability and suitable for the fields of optical tweezers, quantum communication, super-resolution imaging and the like.

A Raman fiber laser includes a pump light source, a reflective end mirror, a wavelength division multiplexer, a Raman gain fiber, and an output end mirror. The output end mirror is an ultra-low reflectance fiber Bragg grating. The reflective end mirror is connected to a reflective end of the wavelength division multiplexer. The pump light source is connected to an input end of the wavelength division multiplexer. One end of the Raman gain fiber is connected to a common end of the wavelength division multiplexer, and the other end of the Raman gain fiber is connected to the ultra-low reflectance fiber Bragg grating. The laser of the present invention can reduce loss of laser light at the reflective end mirror, thereby increasing laser light optical conversion efficiency and output power, and simultaneously achieving high time domain stability and extremely low coherence.

A pulse generation unit generates a driving voltage signal including a pulse signal. A laser oscillation module oscillates a laser beam by carrying out, based on the driving voltage signal, a pulse oscillating operation. When the power command signal has a voltage command value corresponding to a laser power greater than a predetermined laser power during a high period, the pulse generation unit modulates, in a pulsed manner, a voltage value of the high period of the driving voltage signal so as to alternately repeat, for a preset period of time from a rising time of the high period of the driving voltage signal, a high state in which the voltage value is maintained and a low state in which the voltage value is lowered by a predetermined voltage value without being lowered to a voltage value of a low period of the driving voltage signal.

A system and method for generating ultra-short pulses intended to be inserted into a ring laser with a regulator of a pulsed signal of a certain intensity, the system includes an optical attenuator that allows the intensity of the pulsed signal to be adjusted at the input of an optical guide section, and a distributed amplification device inserted in the optical guide that make it possible to manage the power of the signal therein, so that it propagates as solitons or as self-similar pulses without suffering unwanted distortions despite the increase in the length of the laser cavity, increasing the power of the pulsed signal and making it possible to exceed the usual power limits of this type of laser.

In an example, the present invention provides a laser system. The laser system has a source laser (e.g., CBC) coupled to first mirror device opposing a second mirror device and configured to generate a resonating laser beam between the first mirror and the second mirror. In an example, the system has a piezoelectric device configured to the second mirror device and characterized by a refractive e index such that one or more voids is changed by applying an energy to the piezo electric device to cause a change in a value of the refractive index, e.g., by more than 0.0001, to allow the resonating laser beam or a portion of the resonating laser to traverse through a portion of the second mirror device.

The application discloses an SBS phase conjugation mirror capable of displaying a sound wave field in real time, and belongs to the technical field of nonlinear optics.The application comprises the following steps: pump light passes through a half-wave plate and a polarization beam splitter, passes through an optical isolator, changes a polarization state through a quarter-wave plate, is focused through a focusing lens, and then enters an SBS medium pool, stimulated Brillouin scattering occurs, a periodic density modulation is formed in the medium, and an equivalent acousto-optic grating structure is generated.Through introducing an independent probe light beam, the probe light enters the SBS medium pool at an incident angle satisfying the Bragg diffraction condition, and the probe light will be diffracted on the acousto-optic grating formed by the sound wave field.The intensity of the diffracted light changes with the intensity of the sound wave field, so that the real-time measurement of the sound wave field waveform and the life parameter in the SBS process can be realized by detecting the change of the diffracted light intensity with time.

Disclosed herein are assays, methods, and devices for detecting a target ion via ionophore-based ion-selective sensing using Surface Enhanced Raman Spectroscopy (SERS). For example, disclosed herein are assays for detection of a target ion via SERS, the assays comprising: an ionophore, a nanostructured metal, an ion exchanger, and an indicator, wherein the ionophore comprises a binding portion configured to bind with the target ion, wherein the nanostructured metal is configured to enhance a Raman signal of at least a portion of the indicator, wherein the Raman signal changes when the target ion is bound to the ionophore. Also disclosed herein are methods, for example, comprising contacting any of the assays described herein with a liquid sample; subsequently collecting a surface enhanced Raman signal from the liquid sample and the assay; and processing the surface enhanced Raman signal to determine a property of the liquid sample.

A Raman laser conversion device for generating a single longitudinal mode, SLM, laser output is disclosed. The device comprises a Raman medium that exhibits a Stokes emission when subject to pumping by a laser pump input, the laser pump input having a pump linewidth and the Raman medium having a Raman linewidth; wherein the Raman medium is configured to define feedback interfaces of a resonator such that the Stokes emission resonates within the Raman medium; and further wherein the free spectral range, FSR, of the resonator with respect to the pump linewidth and / or the Raman linewidth or a function thereof is such that only one longitudinal mode of the Stokes emission is able to resonate within the Raman medium; whereby the laser conversion device generates a SLM laser output that is frequency shifted with respect to the laser pump input.

This invention relates to the fields of optical fiber communication and microwave photonics. Existing tunable dual-passband microwave photonic filters suffer from poor passband stability and cannot meet practical application requirements. This invention provides a narrow-band tunable dual-passband microwave photonic filter using a Brillouin fiber laser. It generates dual-tone pump light to excite the Brillouin using a tunable laser source and an intensity modulator. Combined with a Brillouin fiber oscillator and a cascaded Fabry-Perot cavity, the Brillouin gain spectrum is narrowed to the kHz level. Simultaneously, the different periodic resonant frequencies of the two ring cavities effectively suppress side modes, filtering out the desired frequency band signal. Furthermore, by synchronously tuning the center frequencies of the two passbands of the filter by changing the pump light wavelength, and simultaneously controlling the output frequency of the signal generator, the frequency interval between the two passbands is changed, ultimately realizing a narrow-linewidth tunable dual-passband microwave photonic filter.

An optical arrangement for adjusting the wavelength of light, comprising: a first light source arranged to generate a first beam of light at a first wavelength; a second light source arranged to generate seed light at a second wavelength; a first Raman shifting medium arranged to receive the light from the first light source in combination with the seed light from the second light source, and to produce, by stimulated Raman scattering, output light at the second wavelength and having temporal properties determined by those of the first beam of light; a third light source arranged to generate seed light at a third wavelength; and a second Raman shifting medium arranged to receive the output light from the first Raman shifting medium in combination with the seed light from the third light source, and to produce, by stimulated Raman scattering, output light at the third wavelength and having temporal properties determined by those of the output light from the first Raman shifting medium; wherein the third wavelength is greater than the second wavelength, and the second wavelength is greater than the first wavelength; wherein the frequency difference between the first beam of light and the seed light from the second light source is a frequency difference where the first Raman shifting medium exhibits Raman gain; and wherein the frequency difference between the output light from the first Raman shifting medium and the seed light from the third light source is a frequency difference where the second Raman shifting medium exhibits Raman gain. Also provided is a corresponding method of adjusting the wavelength of light.

The invention discloses an all-optical microwave oscillator based on a non-polarized radial mode LN-PM birefringence effect, which is used for solving the technical problem that an electronic bottleneck of high frequency and low stability is difficult to break through due to the fact that additional noise is extremely easy to generate due to introduction of an electric signal in a traditional photoelectric oscillator, and belongs to the technical field of optical fiber communication and microwave photonics. The birefringence effect of LN-PM is introduced into the microwave photonic oscillator based on forward Brillouin scattering, the gain and loss coefficient of forward Brillouin are controlled by adjusting a polarization controller, and when the gain coefficient is equal to the loss coefficient and greater than a coupling coefficient, the space time is symmetrically broken to obtain single longitudinal mode microwave photon output. Compared with the prior art, the self-excited pumping source is adopted, electric signal modulation is not needed, a single-frequency microwave photon signal which is high in frequency stability, low in phase noise and high in side-mode rejection ratio can be generated, and the system has the advantages of being simple in structure and higher in adaptability and reliability.

There is provided an ultrafast laser source and a method for fabrication thereof, the system comprising a waveguide module and a compression module, wherein the waveguide module generates pulses of multidimensional solitary states from ultra-short-laser pulses and the compression module compresses the pulses of multidimensional solitary states at the output of the waveguide module, the method comprising generating pulses of multidimensional solitary states from ultrashort laser pulses; and compressing the pulses of multidimensional solitary states.

This excitation light generation device comprises: a first multi-mode laser that outputs first excitation light; a second multi-mode laser that outputs second excitation light; a first excitation current / temperature controller that controls the temperature and excitation current of the first multi-mode laser; a second excitation current / temperature controller that controls the temperature and excitation current of the second multi-mode laser; a first polarization-maintaining variable optical attenuator that adjusts the intensity of light with the polarized state thereof maintained in linear polarization, and outputs the resulting light; a second polarization-maintaining variable optical attenuator that adjusts the intensity of light with the polarized state thereof maintained in linear polarization, and outputs the resulting light; and a polarization-multiplexing circuit that performs polarization-multiplexing and outputs the result. The first and second excitation current / temperature controllers perform control such that the longitudinal modes of the first excitation light and the second excitation light do not overlap. The first and second polarization-maintaining variable optical attenuators perform control so as to provide equal intensities.　

The application belongs to the field of laser frequency conversion, and particularly relates to a gas stimulated Raman frequency conversion device with a double-gas-chamber structure, wherein a pump laser source, a 45-degree mirror and a focusing lens are arranged outside a Raman cell A, two ends of the Raman cell A are respectively provided with a Raman cell window A and a Raman cell window C, the inside of the Raman cell A is provided with a Raman cell B, one end of the Raman cell B is connected with one end of the Raman cell A and shares the Raman cell window A, and the other end of the Raman cell B is provided with a Raman cell window B; one end of the Raman cell A in the length direction is provided with a plane mirror located below the Raman cell B, the other end of the Raman cell A in the length direction is provided with a concave mirror and a plane mirror, and the concave mirror and the plane mirror at the end are arranged in the up-down direction along the height direction of the Raman cell A.

The application discloses a method for generating a dual-wavelength pulsed laser by using a lens array, which comprises the following steps: a laser is used as a pumping light source to emit a laser beam; the laser beam is adjusted by a beam shaping system; the adjusted laser beam is converted into a plurality of sub-beams by a micro-lens array 4f system; the plurality of sub-beams are reflected back and forth in a Fabry-Perot cavity; the reflection of the plurality of sub-beams in the Fabry-Perot cavity is subjected to a laser Raman crystal; and the plurality of sub-beams are emitted from the surface of the Fabry-Perot cavity to become a dual-wavelength pulsed laser source. The application significantly improves the laser frequency conversion efficiency and the power of a new wavelength, and improves the utilization rate of the laser.

The application discloses a high-power single-mode linear polarization Raman fiber laser based on a multimode optical fiber, and is characterized in that: a Raman gain medium of the laser is a single-clad circularly symmetric step-index distribution large-core multimode optical fiber; a base mode diameter of the step-index large-core multimode optical fiber is more than 65% of a core diameter; a Bragg fiber grating is inscribed in the core of the multimode optical fiber by using a femtosecond laser direct writing technology; a long axis of the grating region is coincided with a base mode field supported by the multimode optical fiber in a radial direction in space and length; the grating forms selective optical feedback only to the base mode in the cavity; a grating region with a difference between the long axis and the short axis forms selective feedback to one polarization state of the base mode; thus, the multimode optical fiber Raman laser effectively suppresses generation of mode instability at a high power level through active mode cleaning, and finally realizes near-diffraction-limited single-mode, high linear polarization and high-power Raman fiber laser output.

A fluid filled fiber for a quasi-phase matched generator and a laser incorporating such a fluid filled fiber. The liquid filled fiber has charge transfer molecules dissolved in a solvent. In another embodiment, the liquid of the LF fiber comprises or consists essentially of highly polar liquids and / or charge transfer molecules having relatively high molecular dipole values. The liquid filled fiber is usable with a laser for differential frequency generation.

The utility model discloses a multi-optical-path folding pool SRS (Sounding Reference Signal) ultrashort pulse laser. The device comprises a pump light source, an optical isolator, a beam splitter, an SRS unit, a spectroscope, a reflector, a dichroic mirror and an SRS amplification pool. Initial pump light is generated by the pump light source, one-way propagation is guaranteed through the optical isolator, the pump light is divided into two parts through the beam splitter, one part directly enters the SRS unit to generate Stokes light, the other part passes through the delay line and then is emitted to the dichroic mirror, the spectroscope separates the pump light and the Stokes light, the reflector reflects the Stokes light into the SRS amplification pool, the dichroic mirror reflects the pump light to enter the SRS amplification pool, and the SRS amplification pool emits the SRS light. The SRS amplification pool enables the pump light and the Stokes light to be reflected for multiple times in the pool and to be superposed in optical path, so that the high-power Stokes light is obtained. According to the utility model, through the design of the multi-optical-path folding pool, the energy and power of laser pulses are improved, stable output of high-energy and ultra-short pulses is realized, the energy conversion efficiency is optimized, and the energy utilization effect is improved.

A ring laser includes an optical amplifier, a birefringent resonator, a polarizing beamsplitter, and a bandpass filter forming a ring cavity. The resonator has a first series of resonances corresponding to a first linear polarization and a second series of resonances corresponding to a second linear polarization orthogonal to the first linear polarization. The ring laser generates intracavity pump light having the first linear polarization. The resonator generates stimulated Brillouin laser (SBL) light in response to the pump light coupling to a first resonance of the first series of resonances, the SBL light having the second linear polarization. The resonator generates dissipative Kerr solitons in response to the SBL light coupling to a second resonance of the second series of resonances, the dissipative Kerr solitons having the second linear polarization. The solitons form a frequency comb that is coupled out of the ring cavity via the polarizing beamsplitter.

The invention relates to the technical field of laser output, in particular to a system and method for outputting deep ultraviolet laser through a single optical fiber, and the system comprises a seed laser source, an optical fiber Raman conversion module, a frequency doubling module and a sum frequency module. All modules at the front end of the system can be directly and optically connected through optical fibers, multiple sets of laser sources and frequency locking operation or a complex spatial light path calibration process are not needed, the spatial light path layout is simplified, natural and excellent light beam quality is achieved, the defect that a spatial light path is prone to being interfered by the environment is overcome, and a foundation is laid for the subsequent nonlinear change process; and the optical fiber element can be directly integrated, so that the system integration degree is improved, the heat distribution of the optical fiber element is more uniform, the overall heat management difficulty of the system is reduced, and the stability and the line width consistency of deep ultraviolet laser output are improved.

The invention provides an optical fiber laser module and a Raman optical fiber laser. The optical fiber laser module comprises a seed light source, a first light modulation unit, a pre-amplification unit, a second light modulation unit and a main amplification unit which are sequentially and optically connected. The seed light source is used for emitting continuous seed light, the first light modulation unit is used for modulating the continuous seed light into first pulse light with repetition frequency and narrow bottom width, and the pre-amplification unit is used for pre-amplifying the first pulse light and outputting pre-amplified signal light. The second light modulation unit is used for modulating the pre-amplified signal light into second pulse light with the same waveform as the first pulse light; and the main amplification unit is used for carrying out main amplification on the second pulse light and outputting long pulse square wave signal light with high peak power. According to the invention, the peak power of the output laser reaches a threshold value required by Raman scattering excitation of the Raman fiber laser, key parameters such as repetition frequency and bottom width of the pulse can be accurately controlled, and finally, a high-performance pump light source with strong adaptability is provided for the Raman fiber laser.

The invention discloses a compact tunable narrow-linewidth fiber laser light source, and belongs to the field of fiber lasers. The structure comprises a Brillouin pump and a Brillouin semi-open annular random fiber cavity. The Brillouin pump adopts a tunable laser and provides pump light for the Brillouin semi-open annular random optical fiber cavity. The erbium-doped optical fiber in the cavity serves as a nonlinear Brillouin gain medium and a linear gain medium at the same time, the narrowband gain of Stokes light is achieved through the stimulated Brillouin scattering effect in the optical fiber, laser output of different wavelengths can be achieved by adjusting the wavelength of Brillouin pump light and matching the center wavelength of the tunable filter, and the laser output of different wavelengths can be achieved. Random distributed feedback is introduced through the random fiber bragg grating to form random laser oscillation, the cavity length is greatly shortened, the line width is deeply compressed, and ultra-narrow line width tunable laser output is achieved while it is guaranteed that the structure of the laser light source is compact. According to the invention, the application of the tunable narrow linewidth laser in the aspects of optical fiber communication, biomedical imaging and the like is expanded.

The invention provides a narrow linewidth cascade Raman fiber laser system based on double-grating cooperative feedback, which comprises a pumping module, a Raman gain fiber and an N-order cascade Raman fiber resonant cavity structure, and is characterized in that the N-order cascade Raman fiber resonant cavity structure comprises N-order Raman fiber resonant cavities; wherein the first-order Raman optical fiber resonant cavity to the (N-1) th-order Raman optical fiber resonant cavity are all of asymmetric resonant cavity structures, and each of the first-order Raman optical fiber resonant cavity to the (N-1) th-order Raman optical fiber resonant cavity is composed of two corresponding-order Raman high-reflection gratings and a corresponding-order Raman low-reflection grating; the Nth-order Raman fiber resonant cavity is composed of an N-order Raman high-reflection grating and an N-order Raman low-reflection grating. According to the invention, through the double-Raman high-reflectivity grating in the asymmetric resonant cavity structure, the problem of line width broadening caused by mutual competition of multiple nonlinear effects during high-power operation of a cascaded Raman fiber laser system is solved, and narrow line width output under high power is realized.

A method for amplifying an ultrashort laser pulse includes: a) stretching the ultrashort laser pulse in time, b) amplifying the time-stretched laser pulse, c) compressing the amplified time-stretched laser pulse, with at least one gain phase contribution selected from a group consisting of a gain dynamics phase contribution of the laser pulse that emerges as a change in a nonlinear phase on account of gain dynamics in step b), a gain bandwidth phase contribution of the laser pulse that emerges as a change in the nonlinear phase on account of a gain bandwidth in step b), and a combination thereof, being compensated by virtue of d) an additional phase contribution being imparted on the laser pulse prior to step c) and / or e) a spectrum of the laser pulse being changed, in such a way that the at least one gain phase contribution is compensated after step c).

In an example, the present invention provides a laser system. The laser system has a source laser (e.g., CBC) coupled to first mirror device opposing a second mirror device and configured to generate a resonating laser beam between the first mirror and the second mirror. In an example, the system has a piezoelectric device configured to the second mirror device and characterized by a refractive e index such that one or more voids is changed by applying an energy to the piezo electric device to cause a change in a value of the refractive index, e.g., by more than 0.0001, to allow the resonating laser beam or a portion of the resonating laser to traverse through a portion of the second mirror device.