435 results about "Raman laser" patented technology

A pulsed cascaded Raman laser (10) includes a pulsed light source (102) for generating a pulsed light (104) having an optical spectrum centered at a source wavelength. A non-linear Raman conversion fiber (106) is coupled to the pulsed light source (102). The pulsed light (104) traverses the nonlinear Raman conversion fiber (106) and the source power at the source wavelength is converted to a power output of an output signal (108) having an output wavelength longer than the source wavelength by a cascaded Stimulated Raman Scattering process, such that most of the source power is converted to the power of the last Stokes order in a single pass through the non-linear Raman conversion fiber (106).

A ring laser includes a large-core rare-earth-doped fiber ring-connected with a free-space path having an electro-optic switch, output coupler, and intracavity band-pass filter to enforce lasing operation in narrow wavelength range. In some cavity-dumped modes, the laser is configured in a similar manner, except that an output coupler is omitted since the optical power is extracted from the laser cavity by the electro-optic switch itself. The same laser can be configured to operate in Q-switched and/or cavity-dumping modes as well as in hybrid modes (e.g., partial Q-switch, followed by cavity dumping, or even CW). In some embodiments, the laser can be used as, or inject laser light into, a regenerative solid-state amplifier, or a Raman laser, or can be also used to generate visible, ultra-violet, mid-infrared, and far-infrared (THz) radiation via nonlinear wavelength conversion processes. The various embodiments can use a power oscillator or seed-plus-amplifier MOPA configuration.

A solid state Raman laser includes a laser pump for producing a first radiation at a high power and at a first wavelength along an optical path, a solid Raman active medium in the optical path of the first radiation, the medium including single crystal diamond having a first surface and a second surface, where the first radiation at a high power produces stimulated Raman scattering in the medium and the medium generates a second radiation at a second wavelength, a first optical element in the optical path of the first radiation, wherein the first optical element allows the first wavelength to be transmitted and allows the second wavelength to be reflected, and a second optical element in the optical path of the first radiation, wherein the second optical element allows the first wavelength to be transmitted and allows the second wavelength to be reflected.

The present invention relates to a stable solid-state Raman laser (1), the solid-state Raman laser including: (a) a resonator cavity defined by at least two reflectors (M1 and M2), (b) a laser material (2A) located in the resonator cavity and capable of generating a cavity laser beam which propagates within the resonator cavity, (c) a solid Raman medium (7) located in the resonator cavity for shifting the frequency of the cavity laser beam to produce a Raman laser beam which propagates within the resonator cavity; and (d) an output coupler (M2) for coupling and outputting the Raman laser beam from the resonator cavity, wherein at least one parameter selected from the group consisting of (i) the position of the laser material (2A) relative to the position of the Raman medium (7) in the cavity, (ii) the length of the cavity and (iii) the curvature of at least one of the reflectors (M1 or M2), is selected such that changes in the focal lengths of both the laser material (2A) and the Raman medium (7) as a result of thermal effects in the laser material (2A) and the Raman medium (7) during operation of the laser do not substantially cause instability in the power of the output Raman laser beam. A method of maintaining stable operation of a solid state Raman laser is also described.

The invention discloses a single-wavelength four-Raman laser radar detection system and a detection method. The system combines three laser radar technologies of atmospheric temperature measurement via pure-rotation Raman scattering, vapor measurement via vibration Raman scattering, and measurement of atmosphere aerosol optical characteristics via Raman Mie scattering and an inversion method. The laser radar system employs 355 nm single-wavelength pulse laser as a detection light source and a large-diameter optical reception telescope with high transmittance for measuring the wavelength to collect atmospheric back scattering light signals, four wavelength atmospheric Raman scattering light signals and Mie scattering echo light signals of 353 nm, 354 nm, 355 nm, 386 nm, and 407 nm are mutually separated via an angle separation method of color separation filters and interference filters by a following optical path, the above five-wavelength scattering light signals are gated via narrowband interference filters, photoelectric conversion of photomultipliers of the same type is accomplished, and data acquisition is accomplished by a five-channel data collector.

The invention discloses an optical fiber Brillouin optical time domain analyzer, which is made based on optical fiber broadband nonlinear light amplification effect and strain, temperature effect and optical light domain analysis principle of coherent amplified Brillouin scattering. The optical fiber Brillouin optical time domain analyzer comprises a narrowband single-frequency fiber laser, a fiber beam splitter, a pulse modulator, two optical fiber circulators, a heterodyne receiver, a digital signal processor, a fiber-grating filter, a monomode fiber and a continuous-operating fiber Raman pump laser. The continuous-operating high-power fiber Raman pump laser is used as the pump light source of the Brillouin optical time domain analyzer, which can overcome the difficulty in strictly locking the frequency of a detection laser and the pump laser of the Brillouin optical time domain analyzer; and boardband fiber nonlinear scattering amplification is used for substituting for narrowband Brillouin amplification to increase the gain of stimulated Brillouin scattering with back amplification, thus improving the S/N ratio of the system, increasing the measurement length, and improving the accuracy for simultaneous measurement of stain and temperature.

The invention discloses a vertical gravity gradient measuring sensor based on an atom interference effect, and belongs to the technical field of gravity surveying. The sensor comprises a first unit device (A) and a second unit device (B) of the same structures, and is characterized in that a first vacuum container (1.1) and a second vacuum container (1.2) are connected end to end in the mode that central axes are overlapped in the gravity direction to form a vacuum container (1), and the hollow part inside the first vacuum container (1.1) and the hollow part inside the second vacuum container (1.2) are communicated into a whole; two Raman laser beam emitters (7) are respectively arranged on the vacuum container (1) along the central axis of the gravity field direction, and the Raman laser beam emitters (7) carry out opposite emitting and point to the preparation regions of cold atomic groups (c), and the two unit devices share the pair of Raman laser beam emitters (7). The vertical gravity gradient measuring sensor enables noise and deviation from environment and Raman laser phase positions to be offset in a common-mode mode, and reduces the complexity, the size, the mass and the power consumption of a physical system.

A mid- to far-infrared solid state Raman laser system comprising a resonator cavity comprising: an input reflector adapted to be highly transmissive for light with a first wavelength in the range of about 3 to about 7.5 micrometers for admitting the first beam to the resonator cavity; and an output reflector adapted to be partially transmissive for light with a second wave-length greater than about 5.5 micrometers for resonating the second wavelength in the resonator and for outputting an output beam, the input reflector further being adapted to be highly reflective at the second wavelength for resonating the second wave-length in the resonator; and a solid state diamond Raman material located in the resonator cavity for Raman shifting the pump beam and generating the second wavelength.

A Raman laser system, the system comprising a resonator cavity comprising a plurality of reflectors, wherein at least one reflector is an output reflector adapted for outputting a pulsed output beam from the resonator cavity at a frequency corresponding to a Raman shifted frequency of the pump beam, wherein the output reflector is partially transmitting at the Raman-converted frequency; a solid state Raman-active medium located in the resonator cavity to be pumped by a pulsed pump beam having a pump repetition rate and for Raman-converting a pump pulse incident on the Raman-active medium to a resonating pulse at a Raman-converted frequency resonating in the resonator cavity; a resonator adjuster for adjusting the optical length of the resonator to match the round-trip time of the resonating Raman-converted pulse with the pump beam repetition rate such that the resonating pulse is coincident both temporally and spatially with a pump pulse in the Raman-active medium on each round trip, to Raman amplify the resonating pulse at the Raman-converted frequency in the Raman-active medium. Also a multiwavelength Raman laser system further comprising a dispersive element and a plurality of coupled resonator cavities. Also, methods for providing ultrafast pulsed Raman laser operation.

Silica sol gel micro-lasers and methods of fabricating micro-lasers on a chip or a wafer. A silica sol gel micro-laser includes a silica sol gel optical micro-cavity, a substrate, and a support member or pillar that extends between the micro-cavity and the substrate. An outer surface or periphery of the micro-cavity extends beyond a top of the sol gel support member or is overhanging with respect to the underlying support member. Optical energy travels along an inner surface of the silica sol gel micro-cavity. Undoped silica sol gel micro-cavities can be used for Raman lasers. Sol gel micro-cavities can be doped with, for example, erbium, and can be used for erbium-doped micro-lasers that have ultra narrow line widths, for example, less than 100 Hz. Undoped and doped silica sol gel micro-lasers can have Q factors greater than 10⁷.

The invention discloses an automatic compensation device of a phase noise of a Raman laser system based on closed loop feedback and a method thereof. The device comprises a laser source, a beam splitter, an electrooptical modulator, an acoustic optical modulator, a beam combiner, a half-transparent half-reflecting mirror, a phase modulator, a polarizer, a photoelectric detector, a low noise microwave amplifier, a frequency mixer, a low pass filter, an analog-digital converter, an FPGA, a digital-to-analog converter, a low frequency amplifier and a phase shifter. The automatic compensation device and method provided by the invention are capable of automatically adjusting and compensating a phase difference in the Raman laser system and reducing the phase noise caused by the vibration of a light path of the Raman laser system. By adopting the circuit control mode, the advantages of integration, modularization and easy debugging of a control system are achieved.

The invention discloses an optical fiber type tunable gas Raman laser light source based on hollow-core photonic crystal fiber, wherein a pulse-type tunable single mode Yb-doped fiber laser is used as the excitation source and is connected with one end of the hollow-core photonic crystal fiber filled with high pressure hydrogen (H2) through single mode fiber, and the other end of the hollow-core photonic crystal fiber is connected with the single mode fiber and is used as the output end. Compared with the traditional optical fiber laser, the invention has lower threshold, more flexible wavelength selection and wider spectral range, and can be used as an important means for expanding the wavelength of laser and can obtain the laser which can not be obtained by the conventional laser in some important wave bands.

The present invention relates to an all-optical-fibre adjustable bandwidth continuous spectrum laser pump source (FBCSL) for ultraflat wideband Raman amplification, belonging to the field of high-speed wideband optical fibre communication technology. It adopts a high optical non-linear optical fibre (HNL-DSF) with approaching flat zero dispersion characteristics at Raman laser wavelength place as gain medium, and on the two ends of the above-mentioned HNL-DSF) a wideband reflector can be connected to form all the optical fibre Fabry-Perot (F-P) adjustable bandwidth continuous spectrum Raman laser or a wideband wavelength division multiplexing optical fibre coupler is connected to form all-optical-fibre circular cavity adjustable bandwidth continuous spectrum Raman laser.

The invention discloses a laser radar is based upon lame light source difference absorption process to test thickness of NO2 in the atmosphere, it includes lame light source, light incept and spectrum components, photo-detection and control transaction components, the characteristic is that the light incept and spectrum components accepts the scattered light from atmosphere backward by telescope tube of incept light, after coupling of light fiber, making the light to lay in the focal plane of lens, ripping into the raster by collimation lens, after section out the wave length of light 354.71nm and 360.00nm,recepted by the two emergent light fiber on the focal plane of lens. The raster is blazed grating, it has definite included angle with lens; the photo-detection and control transaction part includes microcomputer, data acquisition card, chronotron, enlarge shaping circuit, photomultiplier and photo-electricity probe. The invention has the beneficial purpose of easy structure, low cost, high diffraction efficiency, good flexibility, convenient using and vindicate etc.

The invention discloses a cold atom interferometry principle-based inertia measuring device. The cold atom interferometry principle-based inertia measuring device comprises three inertia measuring units, a Raman laser, and a light dividing device with adjustable splitting ratio; each inertia measuring unit comprises a single-mode narrow linewidth laser, an interferometic cavity, a optical fiber beam splitter, four acoustic optical modulators (AOM), and one electrooptical modulator (EOM); the interferometic cavities are filled with rubidium atomic vapor; Raman laser light send by the Raman laser can be divided into three beams of Raman laser light via the light dividing device with adjustable splitting ratio, and the three beams of Raman laser light are send to the three inertia measuring units; wherein the incidence directions of the three beams of Raman laser light are orthogonal to each other. According to the cold atom interferometry principle-based inertia measuring device, a reasonable structure scheme is adopted; three atom interferometers are arranged in a pyramid mode, so that sensitive acceleration directions of the atom interferometers are orthogonal to each other, and sensitive angular velocity directions are orthogonal to each other. One set of laser system is shared by the three atom interferometers, so that synchronization of atom interference process is realized, and the atom interferometer-based inertia measuring units are sensitive to inertial parameters with six degrees of freedom simultaneously.

The invention provides a vacuum device for atomic interference gravity measurement, which comprises a two-dimensional magneto-optical trap component, a three-dimensional magneto-optical trap component, an interference component, a detection component and an optical component, wherein the two-dimensional magneto-optical trap is used for atom two-dimensional cooling; the three-dimensional magneto-optical trap component is a tetrakaidecahedron after eight vertex angles are cut from a cube for three-dimensional cooling for atoms after two-dimensional cooling and tossing cooled atoms; the interference component is a cylindrical hollow pipeline for Raman laser incidence; the interference component enables interference to happen to the atoms under mutual effects of stimulated Raman transition laser and tossed atoms; the detection component is cubic for detecting the transition probability of atoms after interference; and the optical component is used for reflecting the incident Raman laser, and together with incident laser, a stimulated Raman transition laser pair is formed. The device height is greatly reduced, the weight of the device is lessened, the device is more flexible, and the stability is greatly enhanced.

A pulsed laser system may include a Raman fiber that is configured to act as multiple wavelength Raman laser. The fiber is configured to receive a pulsed input beam from an input source and convert the input beam to an output beam having narrow band outputs at first and second frequencies v₁ and v₂.