31 results about "Pulse laser irradiation" patented technology

An optical component or optical low-pass filter has two or more regions demarcated by differences in refractive indexes, in which a region having a refractive index different from the refractive index of the continuous region with the largest volume among the two or more regions is formed in the interior of a transparent material. This optical component or optical low-pass filter has regions with different refractive indexes formed in the interior by pulsed laser irradiation or focused irradiation of the transparent material.

The invention discloses a method for detecting harmful interface charges of mercury cadmium telluride thin-film photovoltaic devices. The method uses a beam of ultrafast pulsed laser light with photon energy greater than the band gap of the tested device to back-irradiate the HgCdTe device, and uses a digital oscilloscope to measure the two phases of the photovoltaic device. The evolution relationship between the transient photovoltaic signal between electrodes and time, according to the interface charge-induced electric field measured by the external circuit and the photo-generated electromotive force formed by the pn junction electric field are separated in the time dimension, and the photo-generated electromotive force formed by the interface charge-induced electric field and the effective The identification of the photoelectromotive force formed by the built-in electric field of the metallurgical pn junction can easily obtain the information of the interface charge that has a great influence on the photoelectric response of the device. This is a convenient, rapid and non-destructive identification method, which is of great significance for improving device performance, improving device stability, and guiding people to explore new devices.

The invention discloses a non-contact all-optical photoacoustic imaging device and a method thereof. The device includes a photoacoustic signal excitation component, a photoacoustic signal detection component, an interference phase modulation component, a photoacoustic signal acquisition / processing component, and a scanning platform. The acoustic signal excitation component, the photoacoustic signal detection component, the interferometric phase modulation component and the photoacoustic signal acquisition / processing component are connected in sequence, the photoacoustic signal acquisition / processing component is respectively connected to the photoacoustic signal excitation component, the photoacoustic signal detection component, and the interferometric phase modulation component The scanning platform is respectively connected with the photoacoustic signal excitation component and the photoacoustic signal detection component. The invention utilizes pulsed laser to irradiate biological samples to generate photoacoustic signals, and uses a narrow-linewidth superluminescent diode continuous light source as a photoacoustic signal detection light source to improve the detection sensitivity of samples with insufficiently flat surfaces, which is of great significance to the realization of the clinical application of photoacoustic technology. impetus.

The invention provides a molybdate-containing acid radical solution preparation method, and belongs to the field of preparation and applications of nano-materials. The method includes the steps: providing molybdate-containing acid radical suspension; irradiating the molybdate-containing acid radical suspension by an ultraviolet pulse laser under a stirring condition to obtain molybdate-containingacid radical solution. A molybdate-containing acid radical is derived from molybdic acid and cobalt molybdate or nickel molybdate, the irradiation wave length of the ultraviolet pulse laser is 355nm,pulse width is 5-17ns, and pulse frequency is (0, 20) Hz. By the aid of a liquid-phase ultraviolet pulse laser irradiation technique, mass, pure and soluble molybdic acid, cobalt molybdate and nickelmolybdate solution can be synthesized in a one-step manner. Compared with similar materials on the market, the prepared molybdate-containing acid radical solution has water solubility, does not have impurities and can serve as a molybdenum source to be used and can be prepared into multifunctional molybdenum-based nano-materials such as molybdenum oxide, nickel molybdate and cobalt molybdate nano-materials through after-treatment such as spraying, printing and heat treatment.

The invention discloses a molding process of a PC composite material, which comprises the following steps: A, adding a composite nano-lubricant prepared after drying aluminum sol mixed with inorganic nano-lubricant particles into the material components of the PC layer, and then forming the PC layer; B. The surface of the formed PC layer is modified by pulsed laser irradiation to increase the surface roughness; C. The coating solution is prepared by methyltrimethoxysilane, tetraethyl orthosilicate, and aluminum sol by gel method, and the coating solution is coated The surface of the modified PC layer in step B is dried to form a PC composite multilayer body. In this plan, the coating method is used to improve the scratch resistance of the PC material, and the aluminum sol is compounded with an inorganic nano-lubricant. According to the method of modifying the surface of the PC layer to improve the surface roughness, a coating with an organic-inorganic cross-linked network structure is formed through a co-condensation reaction. After testing, the coating has good adhesion to the PC surface, and the formed PC-coating is composite The multilayer body has strong scratch resistance and good heat resistance.

The invention relates to a method for testing the laser damage threshold of an optical thin film, comprising the following steps: S1, testing and obtaining the laser energy density F when the optical thin film is damaged by a single pulse laser th ; S2, making the single pulse laser irradiate the optical film, recording the laser damage area boundary coordinates (x i ,y i ), and record the number of times n of single-pulse laser irradiation at the same time; S3, compare the Gaussian distribution of laser energy density with the distribution of laser damage area, and obtain the laser damage threshold F when the optical film is damaged by multi-pulse laser irradiation N ; S4. Constantly changing the incident laser energy density, repeating steps S2 and S3 to obtain laser damage threshold curves of the optical thin film under different pulse numbers of femtosecond laser irradiation. The beneficial effect is not only ensuring the measurement accuracy of the laser damage threshold of the optical thin film under multi-pulse laser irradiation, but also greatly improving the testing efficiency of the optical thin film damage threshold under multi-pulse laser irradiation.

The invention provides a method for coloring a substrate of a capacitive touch screen. The method for coloring the substrate of the capacitive touch screen comprises the following steps that a hydrographics transfer film is flat laid on the water surface; an activating agent is sprayed on the surface of the hydrographics transfer film, wherein the activating agent comprises, by weight, 20 parts to 25 parts of diethylene glycol monoethyl ether, 15 parts to 20 parts of N'N-carbonyldiimidazole, 40 parts to 50 parts of xylene and 5 parts to 10 parts of n-butyl alcohol; polishing, pulse laser irradiation and baking are conducted on the substrate of the capacitive touch screen in sequence, then the substrate of the capacitive touch screen is immersed in water, printing ink in the hydrographics transfer film is transferred to the surface of the substrate of the capacitive touch screen under the action of water pressure, and cleaning and drying are conducted. According to the method, the hydrographics transfer printing method is used for coloring the substrate of the capacitive touch screen, it is guaranteed that the thickness of a formed coating is small, the stability is high, falling is unlikely to happen, the technology is simple, and reliability is high.

The invention discloses a method for quadruple modified molybdenum disulfide electrocatalyst, which comprises the following steps: preparation of a precursor; pulse laser irradiation treatment. The invention also discloses a quadruple modified molybdenum disulfide electrocatalyst, which is prepared by the above-mentioned method and used in the field of catalyzing hydrogen evolution.

The invention discloses a method and device for forming a metal reducer pipe based on a laser shock wave technology and belongs to the technical field of laser processing. In the invention, the upper end part, separated from a pipe fitting, of a plugging rod is coated with a laser energy absorption layer; a laser beam enters the interior of a pipe billet to be formed along the axis of the pipe billet, thereby irradiating on the absorption layer on the upper end part of the plugging rod; the absorption layer absorbs laser energy so as to be gasified and ionized, thus forming high-voltage plasmas; and the high-voltage plasmas quickly expand to form a high-amplitude shock wave, thereby promoting the expansion of the pipe billet until the pipe billet is jointed with the profile of a mould, therefore the deformed shape of the pipe billet is in accordance with the profile of the mould. In the invention, the laser shock wave controlled in parameter is utilized as a power source for internal high pressure forming of the pipe billet, and good safety is provided; and the method and device provided by the invention are suitable for not only forming the pipe billet of a material extremely low in yield limit, but also forming the pipe billet with high yield strength; besides, continuous multi-pulse laser irradiation can be performed and uninterrupted multi-impact can be carried out; and high production efficiency is ensured.