38results 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.

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.

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.

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.

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 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 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.