A switchable liquid random laser doped with magnetic nanoparticles

Abstract

A random laser which is used for a liquid mixed with magnetic nanoparticles and is provided with a controllable switch comprises a sealed container, a laser dye solution, scattering particles, a set of magnetic elements, a focusing lens and an optical pumping device, wherein the focusing lens is located between the sealed container and the optical pumping device, the laser dye solution and the scattering particles are arranged inside the sealed container, and the scattering particles are the magnetic nanoparticles. In the working process, the concentration of the magnetic particles in a scattering region is changed by controlling the magnetic field of the magnetic elements, so that the scattering intensity of a pumping area is conveniently changed, and therefore the optical feedback intensity in a random gain medium is changed to achieve the purposes of opening and closing. Compared with prior art, the random laser which is used for the liquid mixed with the magnetic nanoparticles and is provided with the controllable switch is stable in working state, is not affected by the environment temperature easily, is simple in structure, is integrated more easily, can be controlled easily and is wider in application range.

Description

technical field [0001] The invention relates to the field of liquid random lasers, in particular to a switchable liquid random laser doped with magnetic nanoparticles. Background technique [0002] In recent years, random lasers have become a hot research field in the international laser community. Random lasers are different from conventional lasers in that they obtain optical feedback through multiple scattering of radiated light in a disordered gain medium, thereby obtaining optical amplification. So far, researchers have successively observed narrowing of radiation spectral lines and increased intensity in disordered gain media such as semiconductors, laser crystal powders, dye solutions doped with nanoparticles, polymer films, photonic crystals, liquid crystals, and biological tissues. , a random lasing phenomenon with an apparent threshold. [0003] The feedback mechanism of the random laser doped with nanoparticles comes from the multiple scattering of nanoparticles...

AI Technical Summary

Problems solved by technology

The nano-scattering particles in the random laser of the prior art include SiO2, TiO2, Al2O3, Au, Ag, etc. The doping concentration of such nanoparticles is not easy to change in real time when the random laser is working, and it is difficult to realize real-time switch control

[0004] At the same time, the switchable random lasers in the prior art are mainly liquid crystal random lasers regulated by electric field or magnetic field. Liquid crystal random lasers are easily affected by external temperature during work, and their working conditions are very unstable.

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