Abstract: A preparation process of the natural efficient self-assembled photothermal antibacterial nanoparticle is provided that includes mixing a solution of berberine in methanol and a solution of rhein of methanol to obtain a mixed solution, and then mixing the mixed solution with water and performing self-assembly reaction to obtain a self-assembled nanoparticle solution; and mixing the self-assembled nanoparticle solution with a solution of chromium chloride in methanol, and performing coordination reaction to obtain the natural efficient self-assembled photothermal antibacterial nanoparticle. The natural efficient self-assembled photothermal antibacterial nanoparticle prepared by the present invention can quickly raise the temperature under irradiation of near-infrared long-wave light, thus playing a role in instantaneous broad-spectrum sterilization.

Abstract: A degradable nano-preservative film with photodynamic bactericidal activity and a preparation method therefor, and belongs to the technical field of antibacterial preservative films is provided. The present invention synthesizes nanoparticles with aggregation-induced emission characteristic by self-assembly of berberine that is a natural plant antibacterial component and citric acid. Under white light, the nanoparticles can generate a large amount of reactive oxygen species (ROS), thereby exhibiting efficient and durable antibacterial activity. Nanoparticles are prepared by adding the nanoparticles as a filler to a film-mixed solution composed of sodium alginate, pullulan and egg white. With photodynamic bactericidal activity, the present invention improves over current antibacterial preservative films having short lasting effect and which require direct contact to realize bactericidal effect.

Abstract: A laser marking head and a laser marking machine are disclosed. The laser marking head includes: a laser generator, the laser generator being configured to emit laser; a first guide rail; a first sliding device, the first sliding device being sleeved on and being capable of sliding on the first guide rail; a first reflector, the first reflector being positioned on the first sliding device; a second guide rail, the second guide rail being fixed on the first sliding device and being perpendicular to the first guide rail; a second sliding device, the second sliding device being sleeved on and being capable of sliding on the second guide rail; and a second reflector, the second reflector being positioned on the second sliding device.

Abstract: The present disclosure discloses a fiber laser, including a laser seed source, an amplifying optical path, an output optical isolator and an optical fiber cylinder; wherein, the amplifying optical path is connected to the laser seed source and the output optical isolator, the laser seed source is used to output optical source, the amplifying optical path includes a first stage amplifying optical path and a second stage amplifying optical path, the first stage amplifying optical path is connected to the laser seed source and the second stage amplifying optical path respectively, the output optical source is output via the output optical isolator after two-stage amplifying; the second stage amplifying optical path comprises a multi-mode active optical fiber; the multi-mode active optical fiber is coiled on the optical fiber cylinder. By the disposing way above, the present disclosure may improve output optical beam quality of the fiber laser.

Abstract: The present disclosure discloses a fiber laser, including a laser seed source, an amplifying optical path, an output optical isolator and an optical fiber cylinder; wherein, the amplifying optical path is connected to the laser seed source and the output optical isolator, the laser seed source is used to output optical source, the amplifying optical path includes a first stage amplifying optical path and a second stage amplifying optical path, the first stage amplifying optical path is connected to the laser seed source and the second stage amplifying optical path respectively, the output optical source is output via the output optical isolator after two-stage amplifying; the second stage amplifying optical path comprises a multi-mode active optical fiber; the multi-mode active optical fiber is coiled on the optical fiber cylinder. By the disposing way above, the present disclosure may improve output optical beam quality of the fiber laser.

Abstract: The embodiment of the application discloses an optical isolator, comprising an isolator main component and a magnetic field adjusting module, wherein the center of the isolator main component is provided with a central through hole; the isolator main component includes: at least a group of magnet array, a Faraday optical rotation component and a magnetic field adjusting screw disposed in the central through hole; the magnet array is disposed around the central through hole, the magnetic field adjusting module includes: a magnetic field adjusting electric motor; the magnetic field adjusting screw is connected to the magnetic field adjusting electric motor and the magnet army, respectively, the magnetic field adjusting electric motor is configured to adjust magnetic field strength applied to the Faraday optical rotation component from the magnet array by changing the displacement of the magnetic field adjusting screw.

Abstract: A coating method for liquid crystal alignment film of TFT-LCD, at least two different sized nozzles are used to perform N nested rectangular coatings, the N nested rectangles are ordered based on 1, 2 to N measurements sequentially from the smallest to the biggest, and a smaller sized nozzle is employed for the Nth nested rectangular coating on an edge.

Abstract: A two-mode photonic crystal fiber includes a core of a substantially transparent core material. The core material has a core refractive index and a length, and has a core diameter. The fiber also includes a cladding region surrounding the length of core material. The cladding region has a first substantially transparent cladding material, having a first refractive index. The first substantially transparent cladding material has embedded along its length a substantially periodic array of holes, having a diameter, d, and being spaced apart by a pitch, ?. The holes have a second refractive index, which is less than the first refractive index. The dimensions of the hole diameter, d, and the pitch, ?, co-operate to give two modes propagation within the photonic crystal fiber independent of input radiation wavelength for any value of the pitch, ?, for a substantially fixed d/? ratio within a range of approximately 0.45–0.65.

Abstract: A two-mode photonic crystal fiber includes a core of a substantially transparent core material. The core material has a core refractive index and a length, and has a core diameter. The fiber also includes a cladding region surrounding the length of core material. The cladding region has a first substantially transparent cladding material, having a first refractive index. The first substantially transparent cladding material has embedded along its length a substantially periodic array of holes, having a diameter, d, and being spaced apart by a pitch, ?. The holes have a second refractive index, which is less than the first refractive index. The dimensions of the hole diameter, d, and the pitch, ?, co-operate to give two modes propagation within the photonic crystal fiber independent of input radiation wavelength for any value of the pitch, ?, for a substantially fixed d/? ratio within a range of approximately 0.45-0.65.