Research On The Double Cladding Photonic Crystal Fibres And Laser Glass

With the development of information technology, The optical fiber communication network is evolving towards high speed and large capacity and the practical application proposed higher and higher request to the fiber performance. The double-cladding Photonic Crystal Fiber (PCF) which contacts with high-power laser is a important field investigated. Besides, Yb3+doped laser glass is also an indispensable medium of the high-power laser. With the birth of photonic crystal fiber, people start trying to make combination of Yb3+doped glass medium with Photonic Crystal Fiber because of its superior optical properties, which will be the ideal medium for the preparation of ultra-high-power lasers.The dispersion characteristic of a new double-cladding Photonic Crystal Fiber and the characteristics of Yb3+doped laser glass are investigated respectively in this paper. Moreover, Yb3+doped glass is prepared by high-temperature crucible melting method and. has laid the foundation for the preparation of high-power laser .The main results are summarized as follows:Firstly, based on multi-pole method, a kind of new double-cladding Photonic Crystal Fiber is put forward. It has been shown theoretically that it is possible to obtain ?attened dispersion within the wave band of 1.32 to 1.7μm by altering three parameters of the five-ring double-cladding PCF (the diameter of the inner ring holes, the diameter of the outer four rings holes, the pitch of the octagon), and the absolute value of dispersion coefficient merely changes 1.55 ps/km/nm. Moreover, simulation results show that this PCF can assume low confinement losses near the1550 nm wavelength range.Secondly, a series of Yb3+doped silicate laser glass were prepared by high-temperature crucible melting method, the fluorescence spectra parameters such as spectral properties were tested. The impact of rare earth ions doping concentration and glass composition changes on the glass spectrum were analyzed.Finally, The fluorescence spectrum and the absorption spectrum of five ingredients different mixed the Yb3+doped silicate laser glass have carried on the analysis, obtained an ingredient allocated which has the best data, laid the foundation for further experiment.