High-mode photonic crystal fiber (PCF) with high damage threshold, non-linear threshold and good heat dissipation capacity has been the focus of research at home and abroad. The Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, has for the first time proposed the concept of rare earth ion-doped soft glass all-solid-state fiber.
This solution uses low-refractive-index glass instead of air holes, avoiding the defects caused by the presence of air holes, making all-fiber lasers possible. At the same time, the use of soft glass also significantly improves the pump's absorptivity and nonlinearity. Threshold. Using a self-prepared 6wt% antimony-doped high-quality phosphate glass, Shanghai OpticsMaker Co., Ltd. successfully produced a single-mode output, polarization-maintaining phosphoric acid core with a core diameter of 17 Î¼m for the first time using a tube-rod method and a stacking method. Salt full-solid photonic crystal fiber realizes 13.8W laser output in ~40cm fiber. At the same time, by changing fiber symmetry, the polarization maintaining performance of this fiber is achieved, and the degree of polarization maintenance is up to 80%. The results are published in Scientific. Reports [Scientific Reports, 5, 8490, 2015].
Due to the stability of physicochemical properties, low transmission loss, and high softening point of quartz optical fibers, the research focus of current large-mode field optical fibers is mainly concentrated on quartz optical fibers. However, quartz optical fiber has low solubility of rare earths and low nonlinear threshold, which makes its pump absorptivity very low. At the same time, the nonlinear effect is obvious at high power output, which seriously affects the further output of the fiber laser power.
At present, most of the low-index rods constituting the photonic crystal array in the quartz PCF are composed of air, which not only makes the preparation and storage of the optical fiber complicated and high in cost, but also causes the high power of the optical fiber due to poor thermal conductivity of the air. When the mode is unstable, it affects the stability of the beam quality. At the same time, the presence of air holes makes it difficult to weld with conventional pigtail output devices, including pump sources, resulting in an all-fiber laser failure. The all-solid-state photonic crystal fiber developed by Shanghai Optics Machinery Co., Ltd. proposes a new-mode large-mode field fiber, successfully solving the shortcomings of difficult-to-weld, poor heat dissipation, and difficulty in achieving all-fiber lasers.
Hydroxypropyl Methylcellulose is white or white powder, and in cold water is dissolved into clarified or cloudy colloidal solution. Aqueous solution has surface activity, high transparency and stable performance. HPMC has the properties of hot gels. The product water solution is heated and the gel is dissolved, then dissolved and the gel temperature of different specifications is different. The solubility changes with the viscosity, the lower the viscosity, the greater the solubility, and the different specifications of HPMC have certain differences
The hydroxypropyl methylcellulose can be used as the water protection agent and retarder of cement mortar, so that the mortar can be pumped.
In the mortar, gypsum, putty powder or other building materials as adhesives, improve the application and prolong the operation time.
Use as paste ceramic tile, marble, plastic adornment, paste enhancement agent, still can reduce cement dosage.
The water retention performance of HPMC will prevent the slurry from cracking after the application and strengthen the strength after hardening.
The molecular formula of hydroxypropyl methylcellulose is shown below
Hydroxypropyl Methyl Cellulose has high viscosity, medium viscosity, low viscosity, and has a viscosity of 50000, 100000,150000, 200000.
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