A PDLC fiber doped with dye and metal nanoparticles and its fiber random laser

Abstract

The invention discloses a PDLC (polymer dispersed liquid crystal) optical fiber doped with dye and metal nanoparticles. The optical fiber comprises a hollow optical fiber body and a PDLC polymer solidified in the optical fiber body and doped with the dye and the metal nanoparticles, an indium tin oxide (ITO) conductive layer is axially coated on the outer surface of the optical fiber body, an ITO conductive layer identical with the inner diameter of the optical fiber body in width is formed on the outer layer of the hollow optical fiber body by a vacuum magnetron sputtering method, a homogeneous solution is prepared by PDLCs and an ethanol solution of the laser dye and the metal nanoparticles according to a certain mass ratio, is absorbed into the hollow optical fiber body through the capillary effect and fills up the inner diameter of the hollow optical fiber body through light solidifying to enable the refractive index of the polymer to be larger than that of the optical fiber, and positive and negative voltage is connected through the ITO conductive layer to form an electric field to change axial directions of liquid crystal molecules so as to control outputting of random lasers. The PDLC optical fiber doped with the dye and the metal nanoparticles can be applied to aspects of optical communication, sensing, biomedicine, tunable narrow-band coherent light sources and the like.

Description

technical field [0001] The invention relates to the field of laser technology, in particular to a PDLC optical fiber doped with dyes and metal nanoparticles and an optical fiber random laser which can be regulated. Background technique [0002] In recent years, random lasers have become a hot research field in the international laser community. The random laser radiation originates from the excited disordered medium, and provides optical feedback through the multiple scattering of the radiated light in the medium, so as to obtain a large gain without an external resonant cavity. Random lasers have attracted increasing attention due to their unique physical mechanisms and potential applications in optoelectronics and biomedicine. Many active and passive materials can be used to generate random lasing, for example: ZnO powder, polymers, dye-doped liquid crystals, dye-doped polymer dispersed liquid crystals. In recent years, studies have found that metal nanostructures can gr...

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Problems solved by technology

However, this gain medium has not been used in hollow-core fibers

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