The Theoretical Analysis And Performance Of The Fluid State Laser Based On Neodymium-doped Nanoparticles

In recent years, Thermal-induced problems have long act as an important factor for restricting the development of high power solid state lasers. With the flow ability, it is easy to achieve thermal management for the the liquid laser, howerer, due to many factors, it is not readily practiced. For the effective thermal management, also taking into account the good laser performance of solid-state laser materials and the flow ability of liquid laser, a new concept named ”fluid state laser” is proposed, the new fluid state laser material is prepared by dispersing particles of solid laser materials into certain proper liquids.This paper discusses the application and the development course of high power lasers, then the transport equation is derived based on the rate equation of the four-level laser system, by which the characteristics of time, output energy were simulated, and the transport equation is derived on the basis of the rate equation, also the gain characteristics is got, all of these provide theoretical basis for further experiments.The LaF3:Nd nanocrystals is prepared by the process of hydrothermal, and choose the Tetrabromoethane and DMSO as dispersant, then the absorption spectra, fluorescence spectra and fluorescence lifetime of the new fluid state laser material are tested and analyzed by related equipment. Secondly the scattering loss of laser material is calculated and analyzed by the scattering model, at the same time, the paper gets the thermal analysis of laser materials. Thirdly, the pumped coupling system for the laser system is designed by ZEMAX software, then the structure of resonator is designed by analysis, finally the laser experimental system is given.First in order to verify the feasibility of laser system,the laser experimental system is set up using the neodymium glass as laser materials, and maximum multimode output energy of 39.6mJ was achieved with a pump energy of 94 mJ, which has a high slope effeciency. Then the neodymium glass is replaced by the fluid state laser material that we made, it is disappointing that output energy was not achieved. And finally by the theoretical analysis of Israeli experiment, and the comparison between Israeli experiment and this paper experiment, it pointed out that the main problem is weak absorption, what can provide more effective support for further development in the future.