| In recent years,with the development of modern science and technology,more and more research fields require the participation of artificial crystal materials.For traditional bulk crystal materials,they have good mechanical properties and a large thermal conductivity.For glass fibers,they also have advantages such as high aspect ratio and large specific surface area.They each have their own strengths.However,during the development of quartz glass fiber lasers,problems such as low thermal conductivity,limited service life and low laser damage threshold are encountered.Combining these two materials,the concept of single crystal optical fibers has emerged as the times require.Single crystal fiber(SCF)is a one-dimensional laser gain medium between bulk crystal and glass fiber.The material source of single crystal fibers is traditional laser crystals,but the shape of single crystal fibers also upholds the high aspect ratio and large specific surface area of glass fibers,which makes it have good light conductivity,high temperature resistance,high tensile strength,light weight,small size,anti-electromagnetic interference and other excellent characteristics.These excellent properties make single crystal fibers widely used in communication,sensing,medicine,laser and other fields.Therefore,the research of single crystal optical fiber materials has become a new trend and hot spot,and it is particularly important to carry out the research and application of such materials.At present,with the establishment and development of the related theoretical knowledge of single crystal optical fibers,laser weapons derived from this material have gradually come onto the world stage.For the 2.7-3.0 micron mid-infrared band,the laser in this band has strong absorption in water,biological tissue and atmosphere,so it has a wide range of applications in medicine,biology and remote sensing.At present,Laser materials in this band have become the focus of competition among countries and research institutes.The main purpose of this paper is to explore the spectral properties of new materials in this band and the red shift caused by the change of matrix materials.In this paper,Y2.1Er0.9(ScxGa1-x)5O22 doped with Er3+ at 30%concentration was synthesized by solid-state sintering method,and several groups of single crystal fibers with different ratio of Sc3+ to Ga3+ were grown by micro-pull-down method.This is the first time to adjust the fluorescence properties of the whole crystal by adjusting the ratio of Sc3+ to Ga3+ in the matrix material.The structures of a series of compounds were determined by X-ray diffraction(XRD).The internal composition and doping element distribution of each group of compounds were determined by X-ray fluorescence spectrometry and electron probe microanalysis(EPMA).The changes of lattice vibration and phonon energy of each component were also measured and compared by Raman spectroscopy under the same experimental conditions.The absorption spectra,mid-infrared fluorescence spectra and the fluorescence lifetime of Er3+:41I13/2 and 4I11/2 levels of the crystal materials were measured under the same experimental conditions.The fluorescence characteristics of these different components were compared and summarized.By comparing the experimental data of fluorescence lifetime spectra of each component,it is found that when the ratio of Sc3+ increases in the whole polycrystalline material,the fluorescence lifetime of Er3+:4I13/2 level in the grown crystal decreases,which makes the emission spectra of the whole crystal show red shift.From the emission spectra of each component,it can be observed that the red shift occurs between 2795 and 2815 nm,and the specific amount of red shift is 20 nm. |
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