Manufacture Of YB³⁺-doped Laser Glass And Photonic Crystal Fiber And Research On The Spectral Characteristic

Due to its excellent performance and broad application prospects, the fiber laserdoped with rare earth elements becomes concern laser device in recent years. In anumber of rare earth elements, ytterbium ions (Yb³⁺) only have ground state andexcited state, gaining the people’s good favor due to its not-existing excited-stateabsorption, high conversion efficiency, long fluorescence lifetime, wider absorptionband, less concentration quenching and many other advantages. Developments onthe Yb³⁺-doped fiber laser need the suitable Yb³⁺fiber as the working substance. Themain purpose of this paper is to make Yb³⁺-doped laser glass materials with good laserfeature, and make double-clad photonic crystal fiber with the laser glass as the core offiber. The comprehensive experimental test result shows that the prepared Yb³⁺-dopedlaser glass materials fully meet the requirements of Yb³⁺-doped fiber laser, and theresearch result of the paper may provide a reference for the development ofYb³⁺-doped fiber laser. The paper is organized as follows:First of all, the theoretical basis about the Yb³⁺-doped laser glass materials isexplained in detail.Secondly, using the method of aqueous solution and high temperature melting,Yb³⁺-doped laser glass with good absorption feature and fluorescence characteristics isprepared; and the issue on Yb valence change in the experimental process is discussed.Finally, with the prepared Yb-doped laser glass as the core of fiber, the perform isprepared using the stack and drawn into a fiber in drawing tower. In general, in orderto ensure single-mode transmission, the fiber core diameter of the conventionalsingle-mode fiber is relatively small, and thus, the high pump power is difficult toeffectively couple into the fiber. Photonic crystal fiber of the double-clad structureprovides a good solution to the problem. It may not only enable high-powermultimode pump light to couple into the fiber, but also ensure the single-modeoperation of the laser, so this double-clad photonic crystal fiber is used.