330 results about "Dual wavelength laser" patented technology

The invention discloses a screen-vision mouse system and a realizing method thereof, belonging to the technical field of computer input equipment. The screen-vision mouse system comprises a laser control pen and an integrate receiving device, wherein the laser control pen is provided with function buttons, a radio-frequency emission module and a double-wavelength laser emission module; the integrate receiving device comprises a camera module group, a radio-frequency receiving module and a signal processing module for processing information acquired by the camera module and the radio-frequencyreceiving module, an output end of the signal processing module is provided with a connector which is used for communicating with a computer mainframe; and a plurality of infrared receiving tubes arearranged around a nib of the laser control pen, and the infrared receiving tubes are connected with the radio-frequency emission module. The screen-vision mouse system and the realizing method thereof provided by the invention are simple in structure and low in cost, can realize both the remote non-contact control and the close-range screen direct input, and also can magnify object images on the screen.

The invention discloses a double-frequency coherent wind lidar based on single-frequency continuous light EOM modulation. The double-frequency coherent wind lidar adopts dual-wavelength laser as a light source, and detects difference of dual-wavelength Doppler frequency shifts through coherent beat frequency to invert speed; and meanwhile, Doppler frequency shift information is extracted by adopting a microwave signal, thereby reducing speckle noise due to detection object unevenness and atmosphere turbulence. Besides, two side frequencies are generated through a single-frequency continuous wave EOM modulation method; double-frequency laser is generated through a method of utilizing a filter to filter center light frequency and filter out the two side frequencies; and the double-frequency laser generation method improves stability of a double-frequency gap, and the double-frequency gap can be controlled flexibly by adjusting trigger signals of modulators. According to the scheme, the dual-wavelength laser is obtained through single-frequency continuous wave EOM modulation, the speed is extracted through a microwave mode, and atmosphere wind speed information is inverted; the stability of the double-frequency gap is improved; and the double-frequency coherent wind lidar has the advantages of high detection precision, anti-electromagnetic interference and compact structure and the like.

The number and type of quantum wells in a multi-layer gain structure of an external cavity surface emitting laser (VECSEL) are controlled to provide output light of more than one coherent wavelength. The number and type of layers in a multiplayer mirror provides a dual wavelength reflector.

This invention discloses dual field view dual-wavelength laser radar scattering meters structure and detection methods, including laser launch unit echo signal receiver modules, the follow-up optical modules, signal detection and acquisition module and control unit; The laser launch unit using Nd: YAG laser, launching 532 nm and 1064 nm wavelength of the laser pulse at the same time and received by the diameters of 400 mm and 200 mm telescope. Two receiving optical telescope module are follow-up optical module. Optical signal from the follow-up optical module are received by the detection and acquisition module and control unit. atmospheric aerosol extinction coefficient of the vertical profile and continuous distribution, and extinction coefficient level of continuous distribution, can be analyzed through the various atmospheric aerosol optical parameters.

A system and method are disclosed for the simultaneous optical disinfection and detection of biological particles in a flowing fluid, such as air or water, medium. A light source for irradiating the flowing medium is a dual wavelength laser element simultaneously emitting a visible laser beam and an ultraviolet laser beam. In particular, a laser diode may generate a first visible laser light beam, and a second ultraviolet laser light beam may be generated by passing the first laser light beam through a frequency doubling crystal. Optical detectors measure scattering, fluorescence and/or transmission of the laser light beams from the air or water medium to determine the presence of biological particles in real-time.

An invasive laser acupuncture includes a first semiconductor laser connected to a first optical fiber acupuncture and providing red-based laser beam with the first optical fiber acupuncture; a second semiconductor laser connected to a second optical fiber acupuncture and providing a green-based laser beam with the second optical fiber acupuncture; and a driving circuit independently driving the first semiconductor laser and the second semiconductor laser in a continuous mode or a pulse mode by a switching operation. Since red and green lasers can independently be driven in the continuous mode and the pulse mode, the red and green laser can easily be adopted in a reinforcing and reducing treatment method in traditional oriental medicine. In addition, by using a metal-coated optical fiber acupuncture, the optical fiber acupuncture is injected directly into meridian pathways provided under an epidermal layer, such that it is possible to efficiently transmit a laser beam without loss.

Dual wavelength laser energy in the near infrared electromagnetic spectrum is described as destroying bacteria via photo-damage optical interactions through direct selective absorption of optical energy by intracellular bacterial chromophores. Use of various dual wave length laser systems include use of optical assembly including two distinct diode laser ranges (including 870 nm and 930 nm) that can be emitted to achieve maximal bacterial elimination without intolerable heat deposition. Related processes for medical procedures are also described.

Provided are a frequency tunable terahertz transceiver and a method of manufacturing a dual wavelength laser. The frequency tunable terahertz transceiver includes: a dual wavelength laser including two distributed feedback lasers that are manufactured in one substrate and output optical signals of respectively different wavelengths; and an optical device receiving the outputted optical signals to generate a terahertz wave.

The invention relates to a Raman spectrum detection device based on a fibrescope and an implementation method of the detection device. The detection device comprises a dual-wavelength laser device, a fiber optical Raman probe, the fibrescope, a white-light cold light source, an image pick-up device, a Raman spectrometer and a display device, wherein the white-light cold light source is connected to an optical interface of the fibrescope; the image pick-up device is arranged at the upper part of the fibrescope and is used for collecting images in the fibrescope; an output end of the image pick-up device is connected to the display device and is used for displaying the images in the fibrescope; an output end of the dual-wavelength laser device is connected to an input end of the fiber optical Raman probe; and an output end of the fiber optical Raman probe is connected to the Raman spectrometer and a detector thereof. The detection device disclosed by the invention is applicable to real-time Raman spectrum detection and analysis on living bodies of intra-luminal tissues of a human body.

The invention relates to a device and a method for measuring a damage threshold value of an optical thin film irradiated by dual-wavelength laser simultaneously. In the measuring device, the energy and spot size of the laser with different wave lengths are controlled respectively by adopting two different groups of optical paths and the measuring device ensures the consistency of the time of the dual-wavelength laser reaching the surface of a sample to be tested by an optical path delay method. The damage threshold value of the sample to be tested which is acted by the dual-wavelength laser lambda 1 and lambda 2 simultaneously is measured by a method for fixedly selecting the energy density of the laser with a certain wave length lambda 1; and the contribution of the laser with different wave lengths to the damage of the optical thin film is judged by a threshold value difference comparison method. Through the device and the method, the damage threshold value of the optical thin film irradiated by the dual-wavelength laser simultaneously can be obtained; and the contribution of the laser with a certain wave length to the damage can be evaluated.

The invention provides a portable all solid state dual wavelength laser cleaner, which comprises a system controller (1), a dual wavelength all solid state laser (2), a reflective optical system (3), a high speed micro-vibration mirror A (4), a high speed micro-vibration mirror B (5), a scanning field lens (6) and a temperature controller (7). A semiconductor end-pumped dual wavelength laser is used as a cleaning light source. The quality of beam of laser is good, the power density is high and the volume is small and semiconductor refrigeration is employed. The device can simultaneously output a 1064nm laser wavelength and a 532nm laser wavelength, guarantee good cleaning effect and wide application range, be convenient to carry and suitable for mobile cleaning, and can be used for effectively cleaning and removing the smudge on the surface of articles. Simultaneously, the device can also be used to clean the surfaces of optical elements, microelectronic devices, electronic circuit boards, silicon chips, dies and various devices and the like. When the device is used to clean nanoscale particles, the cleanliness is higher than 95 percent with the cleaning efficiency doubled.

The invention discloses a device for outputting dual wavelength laser and terahertz wave based on a single periodical and polarized crystal, which comprises a full reflecting mirror (1), a side pump laser head (2), an acousto-optic Q switch (3), a flat concave mirror (4), a periodical and polarized crystal (5), a temperature control furnace (6) and a plane output mirror (7), wherein the temperature control furnace (6) is used for controlling the work temperature of the periodical and polarized crystal (5); the side pump laser head (2), the acousto-optic Q switch (3), the flat concave mirror (4), the periodical and polarized crystal (5) and the plane output mirror (7) are sequentially arranged on the same optical route; the plane S1 of the flat concave mirror (4) faces to the acousto-opticQ switch (3); and concave surface S2 of the flat concave mirror (4) faces the periodical and polarized crystal (5). With the single periodical and polarized crystal, the device can simultaneously realize the infrared laser output and the terahertz radiation in dual wavelength, is simple and compact in structure, is easy to adjust the optical route, and has high terahertz radiation converting efficiency.

The invention provides a vacuum squeezed type light field generator, which comprises a single-frequency dual-wavelength laser (1), a mold cleaner (2), an optical parametric amplifier (3), a cavity length locking system (4) and a balance homodyne detection system (5); wherein the mold cleaner (2), the optical parametric amplifier (3), the cavity length locking system (4) and the balance homodyne detection system (5) are arranged on an optical base; and the mold cleaner (2) consists of a first lens (6), a half-wave plate (7), a polarization beam splitter (8), a second lens (9), an optical input head (10), a single-mode polarization maintaining fiber (11) and an optical output head (12) arranged on an optical axis in sequence. The invention has the advantages of compact structure, convenient regulation, high stability and high reliability, and has important application value.

A two-wavelength laser interferometer includes: a two-wavelength laser light source that emits two laser beams having different wavelengths; a two-wavelength polarizing beam splitter that includes a beam splitter and a beam superposer, the beam splitter splitting each of the two laser beams having the different wavelengths into a reference beam and a measurement beam, the beam superposer superposing the reference beam and the measurement beam reflected by a reference surface and a target measurement surface together; and a calculator that obtains a displacement amount of the target measurement surface per wavelength from the beams superposed together and obtains a displacement amount of the target measurement surface applied with atmospheric refractive index correction through a calculation in which the displacement amount obtained per wavelength is used. In the two-wavelength laser interferometer, an optical-axis superposer is provided between the two-wavelength laser light source and the beam splitter. The optical-axis superposer initially separates the two laser beams having the different wavelengths emitted from the two-wavelength laser light source and subsequently superposes optical axes of the two laser beams together.

The invention discloses laser radar of double-wavelength for an adaptive range gate. The laser radar comprises a laser source (1) of double-wavelength, an optical delay (2), a transceiver optical system (3), a beam splitter (4), a linear detector (5), a double -mode signal processing module (6), and gating circuit (7), single photon surface array detector (8), and three-dimensional image processing module (9). According to the laser radar of double-wavelength for an adaptive range gate, the effects of dual modes of linear detection and single photon detection are mutually complementary. Targetdistance information is rapidly acquired by the linear detection as an opening signal of the real-time adaptive range gate of the single photon surface array detector, and the range gate changes withthe target, so that the influence of backward scattering and background noise is reduced, and the efficiency of the single photon surface array detection and the working efficiency of the radar system are improved. The double-wavelength data is fused so as to improve point cloud precision and target identification and classification capability.

The invention relates to a device utilizing a single longitudinal mode dual wavelength fibre laser to generate a microwave and a millimeter wave and a working method thereof. The device comprises a pump laser, a wavelength division multiplex optical coupler, an ultrashort linear cavity resonator, an optoisolator and a high-speed photodetector which are sequentially connected to form the device, wherein the ultrashort linear cavity resonator comprises a low reflectivity fiber grating, an active optical fibre and a high reflectivity fiber grating which are sequentially connected to form the device. The device uses the two fiber gratings as reflecting mirrors of the laser, and selects the active optical fibre with proper length as a gain medium for the laser, so as to form the ultrashort linear cavity resonator by combination; the frequency-selective property of the ultrashort linear cavity resonator and the wavelength-selective property of the fiber gratings are utilized for realizing the single longitudinal mode dual wavelength output of lasers; and the single longitudinal mode dual wavelength lasers are coupled into a high-speed photodetector, and microwave signals and millimeter wave signals are generated by frequency beating. The method has the characteristics of simple structure, low cost, narrow microwave and millimeter wave signal bandwidth, low noise, etc.

The invention discloses a compact type optical difference-frequency THz source, which comprises a dual-wavelength laser and a difference-frequency device, wherein the dual-wavelength laser and the difference-frequency device are sequentially arranged. The dual-wavelength laser comprises a pump source, a laser reflective mirror, a laser crystal, a Q switch and a laser output mirror, wherein the above parts are arranged in turn. The difference-frequency device comprises a laser focusing lens and a difference frequency crystal, wherein the laser focusing lens and the difference frequency crystal are arranged in turn. The pump laser emitted by the pump source is injected into the laser crystal. Through the energy level transition process, activated particles inside the laser crystal are transited into the upper level to generate the laser oscillation inside an oscillation cavity formed by the laser reflective mirror and the laser output mirror. The laser crystal is composed of two crystals used for generating the laser oscillation at two wavelengths. By means of the Q switch, the loss of the oscillation cavity is adjusted, so that the pulse laser can be outputted. The outputted laser is injected into the difference frequency crystal after being focused through the laser focusing lens to generate the difference frequency effect, generate and output terahertz waves. The compact type optical difference-frequency THz source is compact in structure, and can be applied to small-cost, miniaturized and portable demand scenarios.

The invention relates to a dual-wavelength laser based on dual-simulated Raman scattering media. The dual-wavelength laser comprises a pumped source, a first diaphragm, a beam compressing system, a second diaphragm and a first attenuation system which are successively arranged along an optical path. The dual-wavelength laser further comprises a Raman medium I, a Raman medium II and a first filtering sheet which are different in Raman displacement. A pumped laser or frequency-converted light thereof is split and then is emitted to the simulated Raman scattering media arranged in parallel or is emitted to the serially-arranged simulated Raman scattering media in sequence, so that a dual-wavelength laser is output. A plurality of selections are available to the pumped light of the Raman media, the Raman media can be freely selected and combined, and a plurality of kinds of dual-wavelength lasers can be obtained. The dual-wavelength laser is simple in structure, high in stability and large in output energy, so that the dual-wavelength laser has a great application value in the fields of laser range finding, laser communication, difference absorption laser radars, laser medicine, fine laser spectrums, terahertz wave generation by a difference frequency method and the like.

The invention discloses a dispersion compensation fiber-based dissipative soliton and soliton dual-wavelength laser, which comprises a laser light diode, a beam combiner, a gain fiber, a coupled output element, a polarization independent isolator, a polarization maintaining fiber, a carbon nano tube, a dispersion compensation fiber, a polarizer, a first polarization controller and a second polarization controller, wherein the beam combiner, the gain fiber, the coupled output element, the polarization independent isolator, the dispersion compensation fiber, the polarization maintaining fiber, the carbon nano tube, the first polarization controller, the polarizer and the second polarization controller are connected according to a fiber order to form an all-fiber ring cavity; and the laser light diode is connected with the beam combiner as a pump light source of the laser. By the dispersion compensation fiber-based dissipative soliton and soliton dual-wavelength laser, 2micron-waveband traditional soliton and dissipative soliton dual-wavelength laser light output can be achieved; the structure is simpler; the cost is lower; and dual-wavelength output mode conversion can be simply and conveniently achieved.

The invention provides an intermediate infrared super-continuum spectrum laser light source. The intermediate infrared super-continuum spectrum laser light source includes a first laser seed source, a second laser seed source, a first laser pumping source, a second laser pumping source, a firs pump combiner, a second pump combiner, an erbium-doped gain optical fiber, a thulium-doped gain optical fiber, a coupler and a sulfide photonic crystal optical fiber; the firs pump combiner combines light outputted by the first laser seed source and the first laser pumping source into pulsed laser which is amplified by the erbium-doped gain optical fiber; the second pump combiner combines light outputted by the second laser seed source and the second laser pumping source into pulsed laser which is amplified by the erbium-doped gain optical fiber; the coupler combines the two beams of pulsed laser into dual-wavelength laser and couples the dual-wavelength laser into the sulfide photonic crystal optical fiber, so that intermediate infrared super-continuum spectrum laser can be outputted; and the sulfide photonic crystal optical fiber includes an annular wrapping layer and a fiber core arranged at the center of the annular wrapping layer, wherein the fiber core is connected with the annular wrapping layer through supporting arms. With the intermediate infrared super-continuum spectrum laser light source of the invention adopted, the spectral range of the intermediate infrared super-continuum spectrum laser can be extended.

The invention discloses an optical fiber acoustic sensor and an optical fiber acoustic detection method. The optical fiber acoustic sensor comprises a first optical fiber grating, a sensing unit, a coupler, a second optical fiber grating, a tunable attenuator, a pumping source, a wavelength division multiplexer, gain optical fibers and a reflector. The coupler comprises four ports, wherein the first port is connected with the first optical fiber grating through the sensing unit, the second port is connected with the second optical fiber grating through the tunable attenuator, the third port is connected with reflector through the wavelength division multiplexer and the gain optical fibers, the pumping source is connected with the wavelength division multiplexer, and the fourth port is connected with an external signal demodulation device. The dual laser gain competitive effect and the two-channel difference signal processing method are utilized to lower noise and improve flexibility. The optical fiber acoustic sensor has the advantages of being high in flexibility, simple in structure, firm, low in cost, high product success rate, stable in work, not flexible to environment temperature, an the like.

The invention relates to a method and devices for optically generating high-frequency microwave signals. The method comprises the following steps of: respectively carving Fiber Bragg Grating with matched wavelength and same period at the two end parts of high-gain polarization-maintaining optical fiber, generating dual-wavelength laser in orthogonality with polarization state by utilizing different index of refraction of the core layer of the high-gain polarization-maintaining optical fiber along the directions of a fast axis and a slow axis, and leading the dual-wavelength laser to have the same polarization state after passing through a polarizer by adjusting a polarization controller, thus obtaining the high-frequency microwave signals. The devices for realizing the method comprise a laser pumping source with the wavelength of 980nm, a 980nm/1550nm optical wavelength-division multiplex, the polarization controller, the polarizer, a photodetector and the high-gain polarization-maintaining optical fiber; and the two end parts of the high-gain polarization-maintaining optical fiber are respectively carved with Fiber Bragg Grating with matched wavelength and same period. The invention can generate microwave signals with high quality and high frequency, has the advantages of simple structure, easy realization, low cost and the like, and is applicable for the fields of research and application such as microwave communication, ROF and the like.

The invention discloses a fluorescence imaging method, which combines two fluorescent materials to prepare a composite fluorescent material. The composite fluorescent material generates two fluorescent signals with misaligned main parts under the excitation of dual-wavelength laser. During imaging, lasers of corresponding wavelengths are respectively employed to excite the composite fluorescent material to emit fluorescence of corresponding waveband. According to the fluorescence imaging method, real-time fluorescence differential super-resolution microscopic imaging can be carried out. According to the invention, two beams of wavelength lasers are modulated to form Gauss light and hollow light respectively, a laser scanning microscopic device is utilized to excite two parts of different fluorescence signals of the same composite fluorescent material respectively, further two detection channels are employed to record two pattern images, and then two channel fluorescence signals are directly subtracted to obtain a super-resolution image. According to the invention, control of light beam switching is unnecessary, super-resolution microscopic imaging can be realized only by single scanning, and the defects of high power loss of light in existing STED technology and two scanning in FED technology can be solved.

On a first region that is a part of one main face of a semiconductor substrate 1, a first semiconductor laser structure 10 is formed so as to have a first lower cladding layer 3, a first active layer 4 with a first quantum well structure and first upper cladding layers 5, 7, which are layered in this order from the semiconductor substrate side, thereby forming a first resonator. On a second region that is different from the first region, a second semiconductor laser structure 20 is formed so as to have a second lower cladding layer 13, a second active layer 14 with a second quantum well structure and a second upper cladding layer 15, 17, which are layered in this order, thereby forming a second resonator. End face coating films 31, 32 are formed on facets of the first and the second resonators, and a nitrogen-containing layer 30 is formed between the facets of the first and the second resonators and the facet coating film. In the semiconductor laser device provided with a high-output dual-wavelength lasers that are formed monolithically, the decrease of the COD level during the high-output operation of the laser can be suppressed.