39results about How to "Increase laser intensity" patented technology

Laser amplification methods and apparatuses. With the invention, one can increase laser intensity on a target by computing a distance to the target, based upon the distance determining an ultra short laser pulse that will in traveling through a medium compress to approximately a minimum width, and emitting the pulse at the target, whereby an intensity of the pulse is approximately maximized upon contact with the target. One can also amplify and detect a laser return signal by receiving the laser return signal, amplifying the received return signal by optical parametric amplification and detecting the amplified signal. One can further perform spectroscopy by determining an ultra short laser pulse such that the pulse compresses and then expands in traveling through a medium, emitting the pulse at a target, and performing spectroscopic analysis of the pulse after propagation.

Methods of the invention comprise methods for nucleic acid sequence determination. Generally, the invention relates to sequencing a target nucleic acid by exposing the target nucleic acid to a primer and a polymerase. Such methods may involve determining the sequence of a target nucleic acid by using a thermophilic polymerase, such as a variant of said 9° N DNA polymerase.

In a method for multi photon excitation of a sample a laser beam is split into at least two coherent partial beams each having a beam axis and a same intensity distribution about its beam axis. The partial beams are directed from different directions towards a common measuring plane running transversely to the beam axes at an inclination angle <1 between the beam axes of the partial beams; and the partial beams are projected onto the measuring plane by means of a common lens system. Thus, an interference pattern formed by the coherent partial beams within the measuring plane provides areas of maximum light intensity adjacent to areas of minimum light intensity.

The present passively Q-switched laser comprises a condensing optical system for condensing a laser beam emitted from a laser light source onto the surface of the solid-state laser medium. The surface of a solid-state laser medium is disposed off the condensation position of the laser beam produced by the condensing optical system,

A method of removing particles from a membrane reticle by a laser beam or beams. The particles on the bottom of the reticle are knocked off and fall away and particles on the top are removed a short distance from the surface and deposited on or near the strut wall and then released. Alternatively, the particles are dragged or rolled to the vicinity of the strut wall.

The invention provides a laser safety protection device and method applied to a distributed Raman fiber amplifier. The laser safety protection device comprises a pump laser monitoring device, a reverse pump light detection device, an OSC monitor signal detection device, an out-band ASE detection device and an in-band signal detection device. A power detector, a reflection power detector, an OSC detector, an ASE band detector and a signal light detector are connected to a centre microprocessor of the distributed Raman fiber amplifier, thereby reducing the potential safety hazard of the strong light power transmitted by the laser in the distributed Raman fiber amplifier on communication system operation and the maintenance personnel.

A pulse compressor for compressing a laser pulse in a laser device using a chirped pulse amplification method includes two identically shaped diffraction gratings arranged parallel to each other with their respective grating surfaces facing each other and a total reflection mirror for receiving a laser pulse through the diffraction grating and returning it back to the same gratings. Each diffraction grating is a reflective blazed diffraction grating having grooves with a sawtooth-shaped section covered with a reflective Au coating on their surface, with the blaze angle determined so that, at the wavelength of the laser pulse to be used, the incident angle of a laser pulse entering the pulse compressor and first order diffracted light form a relationship of mirror reflection with the groove slope and so that a predetermined level of diffraction efficiency is obtained. Since the laser pulse impinges on the grating at substantially right angles to the groove slope, a high level of damage threshold is obtained and a high-power laser pulse can be generated.

There is herein described a ceramic phosphor target which may be used in a laser-activated remote phosphor application. The target comprises a substantially flat ceramic phosphor converter comprised of a photoluminescent polycrystalline ceramic which is attached to a reflective metal substrate by a high thermal conductivity adhesive.

A method for extending and enhancing bright coherent high-order harmonic generation into the VUV-EUV-X-ray regions of the spectrum involves a way of accomplishing phase matching or effective phase matching of extreme upconversion of laser light at high conversion efficiency, approaching 10−3 in some spectral regions, and at significantly higher photon energies in a waveguide geometry, in a self-guiding geometry, a gas cell, or a loosely focusing geometry, containing nonlinear medium. The extension and enhancement of the coherent VUV, EUV, X-ray emission to high photon energies relies on using VUV-UV-VIS lasers of shorter wavelength. This leads to enhancement of macroscopic phase matching parameters due to stronger contribution of linear and nonlinear dispersion of both atoms and ions, combined with a strong microscopic single-atom yield.

The invention particularly relates to a highway tunnel fire monitoring system and method based on image fusion. The system comprises a camera unit used for acquiring a visible light image of a tunnel fire accident; an infrared scanning unit used for acquiring a thermal imaging image of the tunnel fire accident and the surrounding environment; a laser radar unit used for acquiring a three-dimensional scanning image of the tunnel fire accident and the surrounding environment; and an image fusion display unit used for fusing the thermal imaging image into the visible light image and then fusing the three-dimensional scanning image into a color fusion image to obtain a three-dimensional color fusion display image containing information such as temperature, distance, coordinates and the like for highway tunnel fire monitoring. The invention also correspondingly discloses a highway tunnel fire monitoring system and method. According to the highway tunnel fire monitoring method, accident information images can be effectively acquired in severe environments such as low visibility and strong light, so that important rescue guidance can be provided, and the monitoring effect of highway tunnel fire monitoring can be improved.

The invention belongs to the technical field of optical lasers, and specifically relates to a liquid crystal photonic crystal fiber random laser and a manufacturing method therefor. The invention provides the liquid crystal fiber laser with a function of controlling the random laser emitting direction. According to the invention, the aqueous solution of cholesteric liquid crystal which is doped with a laser dye and mixed with polyvinyl alcohol is injected into a photonic crystal fiber, and the liquid crystal laser which can control the random laser emitting direction can be constructed through the light transmission characteristics of the photonic crystal fiber. Therefore, the conventional random laser emitting direction can be controlled, thereby improving the laser intensity of the photonic crystal fiber to a great extent.

The invention relates to a zero-dimensional perovskite Cs4PbBr6 micro-crystal capable of regulating and controlling laser performance and a preparation method thereof, the micro-morphology of the micro-crystal is of a rod-like structure, the size of the micro-crystal is 35-280 [mu]m, and emitted light can be regulated by changing the included angle between the polarization direction of exciting light and the long axis direction of a rod. According to the zero-dimensional perovskite Cs4PbBr6 micro-crystal, cesium bromide and lead bromide are used as raw materials, the preparation method comprises the following steps: taking dichloromethane as an anti-solvent and CTAB as an inducer, carrying out closed reaction in an organic solvent, washing and drying a product to obtain the zero-dimensional perovskite Cs4PbBr6 micro-crystal, and regulating and controlling the laser performance of the micro-nano laser by regulating the size of a micro-rod and polarized light. According to the invention,the intensity of the emitted laser can be regulated and controlled by regulating the size of the micron crystal, and the intensity of the emitted laser is enhanced along with the increase of the size.

The invention relates to the technical field of food detection, and discloses an air tightness sampling detection device for bagged instant noodles. The device comprises a cylinder body, wherein a laser emitter is fixedly arranged on the left wall of the cylinder body; a photoresistor is fixedly arranged on the right wall of the cylinder body; a water inlet pipe is fixedly connected to the bottomof the cylinder body; a first electromagnetic valve is arranged in an inner cavity of the water inlet pipe; a water outlet pipe is fixedly connected to the bottom of the cylinder body and located on the right side of the water inlet pipe; a supporting arm is fixedly connected behind the cylinder body; a sliding rod is arranged on the supporting arm; a driving device is arranged on the sliding rod;a telescopic rod is arranged below the driving device; and a clamping plate is fixedly connected below the telescopic rod. According to the air tightness sampling detection device for the bagged instant noodles, a sample is clamped by utilizing an electrified electromagnet, a gas device is matched to vacuumize the cylinder body, water intake and drainage are carried out through the water inlet pipe and the water outlet pipe, and the photoresistor is used for detecting, so that the effects of novel structure, simplicity in use, labor saving and accurate detection are achieved.

An antenna system that generates radiation similar to that generated by a relativistic charged particle is provided. The antenna system includes a conducting wire carrying a current pulse with a net charge, called a quasi charged particle, which propagates near the speed of light and emits radiation. Preferably, the quasi charged particle is generated by using a pulsed laser to knock out electrons from the conducting wire. While propagating on the conducting wire near the speed of light, the quasi charged particle generates a synchrotron like radiation from a bent of the wire, an undulator like radiation from a sinusoidal or helical structure of the wire, a diffraction like radiation from an aperture transmitting the wire, a Smith-Purcell like radiation from a corrugated grating surface next to the wire, and a greatly wavelength-contracted undulator like radiation from an undulator with the wire aligned along the undulator axis.

The invention provides a frequency stabilization apparatus for a laser interferometer. The frequency stabilization apparatus comprises a circuit control system, a laser, a guiding light path, a frequency-stabilizing light path, and a laser output light path. The guiding light path guides light emitted by the laser to the frequency-stabilizing light path. And the frequency-stabilizing light path consists of a first spectroscope, a second spectroscope, and a photocell. In addition, the invention also provides a frequency stabilization method for a laser interferometer. The apparatus and the method have the following beneficial effects: on the basis of the design of frequency-stabilizing light splitting, the proportion of light for frequency stabilization in the laser is low, so that the energy loss of the frequency-stabilizing part is extremely low and thus the working laser strength is enhanced substantially; because of the angle and dimension design of the first spectroscope, the influence on the frequency-stabilizing precision by stray light can be reduced substantially; the frequency-stabilizing light splitting adjustment becomes convenient; the structure is simple and is easy to implement; the structure is compact and is easy to mechanical packaging; and the precision and reliability of frequency-stabilizing data can be guaranteed based on the symmetric optic and electronic design.

The invention belongs to the biochemical detection field and particularly relates to a biochemical quantitative detection device and method based on photo-thermal interference of scattered light. According to the device and method, the problems that a micro-volume rapid detection method of colored compounds only can be utilized for carrying out qualitative and semiquantitative detection and can cause more false positive results, and developed pictures of to-be-detected matters acquired by equipment such as cameras and mobile phones are easily interfered by external light sources are solved. The device comprises a microchannel, a laser device, a photoelectric detector, a total reflection mirror and a computer, wherein the microchannel is formed in a microchannel fixing platform, the total reflection mirror which forms an included angle of 45 degrees with the horizontal plane is arranged above the microchannel, the laser device and the photoelectric detector are arranged on one side of the mirror surface of the total reflection mirror, the laser device is horizontally arranged, and the photoelectric detector is connected with the computer. By combining a scattered light interferencetechnique with a photo-thermal effect, the rapid quantitative detection of colored matters is realized, and the volume of a sample required by the related detection method is small, so that the influences caused by external environmental temperature are avoided.

The invention provides a paint and a using method thereof and discloses a multi-coating product. The painting comprises a prime coat component and a finish paint component. The prime coat component comprises a prime coat resin, a light stabilizer, a prime coat pigment and prime coat solvent, wherein the prime coat resin is thermoplastic acrylic resin the glass transition temperature of which is less than 55 DEG C. The finish paint component comprises a finish paint resin, a finish paint pigment and finish paint solvent, wherein the finish paint resin is the thermoplastic acrylic resin the glass transition temperature of which is 80 to 120 DEG C. When the paint is used for preparing a coating, the process is simple and the used paint is environmentally-friendly.

The invention discloses a super-resolution biomolecular mass spectrometry imaging device and a working method thereof. The device is characterized by comprising: a laser, an optical modulator assembly, an optical element, a slide, a camera, a reflector and a mass spectrometer. The laser emitted by a laser is modulated by the optical modulator assembly, and is then focused on a target sample placed on the slide through the optical element, desorption ionization occurs to the target sample, then the sample enters the mass spectrometer to undergo detection, the optical modulator assembly consists of a coding aperture, by which the target sample at a corresponding pixel detection position is irradiated by laser, and the reflector and the camera are used for acquiring the targe sample information. The super-resolution biomolecular mass spectrometry imaging device provided by the invention adopts the mass spectrometry imaging technology based on the coding aperture and mass spectrometer, changes the inherent framework of existing lattice optical mechaical scanning, acquires super-resolution biomolecular microscopic mass spectrometry imaging, and has the advantages of high spatial resolution, high sensitivity, fast imaging speed and high signal-to-noise ratio.

The present invention discloses an indium tin oxide transparent electrode-based opposed-contact photoconductive switch. The indium tin oxide transparent electrode-based opposed-contact photoconductive switch includes a vanadium-compensated silicon carbide semi-insulating substrate (1), an upper ohmic contact electrode (2), a lower ohmic contact electrode (3), an upper thin film electrode (4) and a lower thin film electrode (5); the upper ohmic contact electrode (2) and the lower ohmic contact electrode (3) are respectively deposited on the front surface and back surface of the vanadium-doped silicon carbide substrate (1); the upper thin film electrode (4) is deposited on the front surface of the vanadium-doped silicon carbide substrate (1) and the surface of the upper ohmic contact (2); the lower thin film electrode (5) is deposited on the back surface of the vanadium-doped silicon carbide substrate (1) and the surface of the lower ohmic contact electrode (3); the upper thin film electrode and the lower thin film electrode are both made of a transparent indium tin oxide material; and therefore, the photoconductive switch can be turned on when the surfaces of the electrodes are under illumination, and the light receiving area of the device is increased, the photon concentration and laser energy utilization rate of a conductive channel can be improved. The photoconductive switch can be used for a high-speed pulse system.

An antenna system that generates radiation similar to that generated by a relativistic charged particle is provided. The antenna system includes a conducting wire carrying a current pulse with a net charge, called a quasi charged particle, which propagates near the speed of light and emits radiation. Preferably, the quasi charged particle is generated by using a pulsed laser to knock out electrons from the conducting wire. While propagating on the conducting wire near the speed of light, the quasi charged particle generates a synchrotron like radiation from a bent of the wire, an undulator like radiation from a sinusoidal or helical structure of the wire, a diffraction like radiation from an aperture transmitting the wire, a Smith-Purcell like radiation from a corrugated grating surface next to the wire, and a greatly wavelength-contracted undulator like radiation from an undulator with the wire aligned along the undulator axis.

The invention discloses a portable device for derusting a metal surface through the semiconductor laser. The portable device for derusting the metal surface through the semiconductor laser comprises atank, wherein an end cover is rotatably connected to one end of the tank; a connecting mechanism is arranged between the end cover and the tank; multiple rolling wheels are arranged on the lower sidewall of the tank; two pull rods are fixed to the upper side wall of the tank; a laser device is fixed to the inner top wall of the tank; the drive end of the laser device is vertically downward; a beam expanding mirror and a focusing mirror are sequentially arranged on the lower side of the laser device; connecting rods are fixedly connected between the outer side wall of the beam expanding mirror and the inner top wall of the tank as well as the outer side wall of the focusing mirror and the inner top wall of the tank; and a telescopic rod I is fixed to the inner bottom wall of the tank. According to the portable device for derusting the metal surface through the semiconductor laser provided by the invention, the derusting work on a workpiece surface is realized through realizing the moving and steering of the clamping work and the contact of a laser beam, so that the thoroughness in derusting is realized, and no metal damage or environment pollution can be caused; and meanwhile, nitrogen is sprayed out for protecting the metal and blowing away powder dust, so that the derusting work is ensured to be well carried out.

The invention discloses an LNG (Liquefied Natural Gas) detecting device and a detecting method thereof. The device comprises a laser, a wavelength switching filter disc, a detector, an amplifier and a processor, wherein the laser, the wavelength switching filter disc, the detector, the amplifier and the processor are integrally mounted on one instrument board; the output end of the detector is connected with the input end of the processor after passing through the amplifier; two input ends of the processor are respectively connected with a computer and a stepper motor; the stepper motor is connected with the wavelength switching filter disc through a shaft connector. The device adopts a distributive feedback laser with 1668 nm of wave band as a light source, and uses an infrared spectroscopy method to detect the methane absorption peak; the reflected laser has obvious features; the detecting method is a quick and precise method for detecting gas at present, and can detect the concentration of the LNG in the range of 1.6-100%; the detecting device can be mounted on a helicopter or a fixed wing aircraft to totally realize the actual field detection, has high laser strength and far detecting distance, and can implement the all-weather detection.

The invention belongs to the field of laser technology, and discloses a low-threshold Tm:ZBLAN glass continuous and Q-modulating mode-locked all solid state laser. The laser comprises the components of a pumping source which is used for generating pumping laser with wavelength of 793nm; a focusing lens which is used for realizing high permeability to the pumping laser and focusing the pumping laser to crystal; a Tm:ZBLAN glass laser gain medium which is used for changing the wavelength of laser and changing the pumping laser with central wavelength of 793nm to the laser in the 2[mu]m waveband;a low-threshold resonator which is used for realizing operation of low-threshold laser; and a transmissive semiconductor saturable absorption lens (SESAM) which is used for converting output continuous light to pulse light. According to the low-threshold Tm:ZBLAN glass continuous and Q-modulating mode-locked all solid state laser, continous light outlet threshold is reduced to 35nW; the stable Q-modulating mode-locked threshold power is reduced to 973mW; the Q-modulating envelope pulse width is 6[mu]s; the repetition frequency is 25kHz; the pulse repletion frequency in Q-modulating envelope is 106.4MHz; the pulse width is about 800ps; and highest monopulse energy is 1.09nJ.

The present invention discloses a zinc oxide transparent electrode-based opposed-contact photoconductive switch. The zinc oxide transparent electrode-based opposed-contact photoconductive switch includes a vanadium-doped silicon carbide substrate (1), an upper ohmic contact electrode (2), a lower ohmic contact electrode (3), an upper thin film electrode (4) and a lower thin film electrode (5); the upper ohmic contact electrode (2) and the lower ohmic contact electrode (3) are respectively deposited on the front surface and back surface of the vanadium-doped silicon carbide substrate (1); the upper thin film electrode (4) is deposited on the front surface of the vanadium-doped silicon carbide substrate (1) and the surface of the upper ohmic contact (2); the lower thin film electrode (5) is deposited on the back surface of the vanadium-doped silicon carbide substrate (1) and the surface of the lower ohmic contact electrode (3); the upper thin film electrode and the lower thin film electrode are both made of a transparent zinc oxide material; and therefore, the photoconductive switch can be turned on when the surfaces of the electrodes are under illumination, and the light receiving area of the device is increased, the photon concentration and laser energy utilization rate of a conductive channel can be improved. The photoconductive switch can be used for a high-speed pulse system.

The present invention discloses a zinc oxide transparent electrode-based opposed-contact photoconductive switch. The zinc oxide transparent electrode-based opposed-contact photoconductive switch includes a vanadium-doped silicon carbide substrate (1), an upper ohmic contact electrode (2), a lower ohmic contact electrode (3), an upper thin film electrode (4) and a lower thin film electrode (5); the upper ohmic contact electrode (2) and the lower ohmic contact electrode (3) are respectively deposited on the front surface and back surface of the vanadium-doped silicon carbide substrate (1); the upper thin film electrode (4) is deposited on the front surface of the vanadium-doped silicon carbide substrate (1) and the surface of the upper ohmic contact (2); the lower thin film electrode (5) is deposited on the back surface of the vanadium-doped silicon carbide substrate (1) and the surface of the lower ohmic contact electrode (3); the upper thin film electrode and the lower thin film electrode are both made of a transparent zinc oxide material; and therefore, the photoconductive switch can be turned on when the surfaces of the electrodes are under illumination, and the light receiving area of the device is increased, the photon concentration and laser energy utilization rate of a conductive channel can be improved. The photoconductive switch can be used for a high-speed pulse system.

A method for extending and enhancing bright coherent high-order harmonic generation into the VUV-EUV-X-ray regions of the spectrum involves a way of accomplishing phase matching or effective phase matching of extreme upconversion of laser light at high conversion efficiency, approaching 10−3 in some spectral regions, and at significantly higher photon energies in a waveguide geometry, in a self-guiding geometry, a gas cell, or a loosely focusing geometry, containing nonlinear medium. The extension and enhancement of the coherent VUV, EUV, X-ray emission to high photon energies relies on using VUV-UV-VIS lasers of shorter wavelength. This leads to enhancement of macroscopic phase matching parameters due to stronger contribution of linear and nonlinear dispersion of both atoms and ions, combined with a strong microscopic single-atom yield.

The invention belongs to the technical field of optical lasers, and specifically relates to a liquid crystal photonic crystal fiber random laser and a manufacturing method therefor. The invention provides the liquid crystal fiber laser with a function of controlling the random laser emitting direction. According to the invention, the aqueous solution of cholesteric liquid crystal which is doped with a laser dye and mixed with polyvinyl alcohol is injected into a photonic crystal fiber, and the liquid crystal laser which can control the random laser emitting direction can be constructed through the light transmission characteristics of the photonic crystal fiber. Therefore, the conventional random laser emitting direction can be controlled, thereby improving the laser intensity of the photonic crystal fiber to a great extent.