82results 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 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.

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.

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.

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.

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.

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.

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.

A Raman amplifier includes a first light source that outputs a primary pumping light, which propagates in a same direction as a propagation direction of a signal light, to an optical transmission line for Raman amplification, a second light source that outputs a secondary pumping light, which pumps and amplifies the primary pumping light and propagates in the same direction as the propagation direction, to the optical transmission line, and a control unit that controls a gain for the signal light by adjusting power of the secondary pumping light.

The present invention provides laser systems and methods for nuclear fusion energy, as well as related methods, and more specifically, techniques for damping lasers from cavity regions. [Solution] The laser system includes a laser source (CBC, etc.), which is coupled to a first mirror device facing a second mirror device and configured to generate a resonant laser beam between the first mirror and the second mirror. In one example, the system includes a piezoelectric device, which is provided in the second mirror device and characterized by its refractive index, and by applying energy to the piezoelectric device, one or more air gaps are changed to cause a change in the refractive index value (to a value greater than 0.0001, etc.), allowing a resonant laser beam or a portion of the resonant laser to pass through a portion of the second mirror device.

To provide a terahertz wave generator and a terahertz wave generation method that can generate terahertz waves with high efficiency. [Solution] The terahertz wave generator 1 comprises an oscillator 2 that oscillates ultrashort pulse light L, a fiber amplifier 3 that broadens the spectrum of the ultrashort pulse light L oscillated by the oscillator 2, a soliton shift fiber 6 that modulates the wavelength of the ultrashort pulse light L whose spectrum has been broadened by the fiber amplifier 3 using soliton self-frequency shift, and an organic crystal 9 that generates terahertz waves when irradiated with the ultrashort pulse light L modulated by the soliton shift fiber 6.

This invention provides a device and method for achieving 9.2 μm mid-infrared laser output via stimulated Raman scattering, belonging to the field of mid-infrared laser source technology. In this invention, the pump laser output from the pump laser is input into a Raman cell filled with Raman medium gas to achieve a 1.9 μm wavelength laser output. It is then focused by a focusing lens into a second Raman cell filled with Raman medium gas, and finally output from the Raman cell after multiple reflections by a Herroitt concave mirror. The laser undergoes multiple focusing processes within the Raman cell. This invention utilizes an existing high-pulse-energy Nd:YAG fundamental frequency laser as the pump source to pump the Raman medium, generating a 9.2 μm wavelength second-order Raman laser through hydrogen stimulated Raman scattering. Compared to other methods, this invention can achieve a relatively high pulse peak power and a relatively high laser pulse energy at 9.2 μm.

The application discloses a Kerr-Briou high signal-to-noise ratio narrow line width optical comb generation method. First, a Kerr single soliton optical comb tooth is obtained by pumping laser and auxiliary laser on the output of an optical microcavity. Then, any number of continuous distribution comb teeth with power reaching an erbium-doped fiber amplifier amplification threshold are selected and shaped to make the comb tooth power consistent. Finally, the selected and shaped Kerr single soliton optical comb tooth is power amplified and then input into a fiber ring cavity to excite a Briou effect, so that a comb tooth with higher signal-to-noise ratio, narrower line width and lower frequency noise, i.e. a Kerr-Briou high signal-to-noise ratio narrow line width optical comb, is obtained.

Disclosed are a control method and an optical fiber amplifier. The optical fiber amplifier is configured to execute the control method. The method comprises: initially adjusting a target gain on the basis of a first offset gain to obtain the post-initial-adjustment target gain; when the actual power of the pump laser reaches target power determined on the basis of the post-initial-adjustment target gain, obtaining, on the basis of a first signal optical power and a second signal optical power, a second offset gain and a first offset slope through calculation; adjusting again the post-initial-adjustment target gain according to the second offset gain to obtain a adjusted target gain; and adjusting a target slope according to the first offset slope to obtain a adjusted target slope. This solution can provide high precision control for the gain and the slope of the optical fiber amplifier.

The invention relates to a method for generating a supercontinuum, the method comprising the following steps: a) radiating a carrier laser pulse (1) having a first temporal width (Δτ1) onto a first non-linear material (2); b) at the same time, radiating a second shorter laser pulse (3) having a second temporal width (Δτ2) onto the first non-linear material (2), thereby changing the non-linear properties of the first non-linear material and imprinting a ghost pulse (5) having a third temporal width (Δτ3) into the carrier pulse (1); the second temporal width (Δτ2) being at least two times shorter than the first temporal width (Δτ1), and c) radiating the carrier pulse (1') with imprinted ghost pulse (5) onto the first non-linear material (2) or a second non-linear material (8) and generating, by self-phase modulating, a supercontinuum (9) around the center frequency of the carrier pulse (1).

Example optical amplification apparatuses and example signal amplification methods are provided. One example optical amplification apparatus is connected to an optical fiber. The optical amplification apparatus includes a first pump laser and a first gain medium. The first pump laser is configured to emit first pump light. The first gain medium is configured to receive the first pump light and first multi-channel optical signals from the optical fiber; and perform gain amplification on the first multi-channel optical signals based on the first pump light, where the first pump light overlaps each of the first multi-channel optical signals in the first gain medium.

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.　

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.

In some implementations, a fiber amplifier system includes a fiber oscillator and a fiber amplifier coupled to an output end of the fiber oscillator. The fiber oscillator may include an active fiber having a first end and a second end, where the active fiber is to receive pump light from one or more optical sources; one or more high-reflectivity mirrors coupled to the first end of the active fiber; and multiple output coupler mirrors coupled to the second end of the active fiber. The one or more high-reflectivity mirrors and the multiple output coupler mirrors may form an optical cavity with the active fiber for generating laser light. The multiple output coupler mirrors may have respective center wavelengths that are different. The multiple output coupler mirrors may have respective reflection spectrums that are different.