Study On The Preparation And The Properties Of The Er/Yb Co-doped Phosphate Glasses

Erbium-doped glass is one of the most important laser materials because of its key role in the optical signal amplification for 1.53μm telecommunication. To support the optical integration, increasing doping concentration is an effective solution to obtain high output power or high gain in miniaturized lasers and amplifiers. Unfortunately, most solid laser materials exhibit pronounced concentration quenching at high doping concentration. Er/Yb co-doped system has been found to be an effective method to enhance the gain due to the excellent sensitizing ability of Yb³⁺ ions. Since the phosphate of rare earth ions have high solubility, therefor, it is importance to study the physical properties and photoluminescence properties of Er-doped and Er/Yb co-doped system in phosphate glass for the development for lasers and amplifiers working at 1.5μm.In this paper, prepared by two-step melting of the same matrix, Er³⁺ ion concentration of the same fixed-0.5mol% concentration of Yb3+ ion 0mol% followed by the increase in 1.5mol% to 7.5mol% change in a series of phosphate glasses, and the Yb³⁺ ion concentration of the glass-doped sample density, thickness, refractive index, thermal stability and other physical properties of the test; According to the absorption spectra of the samples, calculated using J-O theory of this glass system, a series of spectral parameters, and fluorescence spectrometry analysis has been tested. In addition, in front of the best ratio analysis program based on the use of heavy metal oxide Bi₂O₃ added their modification, testing and comparison of the performance. Finally, analyzing the effects of preparation conditions can determine the optimal preparation of the program.Glass samples prepared by density between 1.4470～1.5382g/cm³, when doped Yb₂O₃ to 6.0mol% (E5 samples), the maximum density of the glass for 1.5382 g/cm³, the refractive index of glass samples about 1.54. Through the DTA test, to be the beginning of the sample glass crystallization temperature and glass transition temperature differenceâ–³T, the maximum sample E5 for 154℃, with good thermal stability. Water glass on the series of performance tests, two hours prior to the discovery of corrosion after large increase in the basic linear.The experimental absorption spectra of the light-emitting glass test, absorption spectra of the main absorption peak 7, the center wavelength, respectively: 488, 520, 544, 651, 798, 978, 1534nm, absorption peaks correspond to Er³⁺ ions from the ground state 4I15/2 to each excited state ⁴F_7/2,²H_11/2,⁴S_3/2,⁴F_9/2,⁴I_9/2,⁴I_11/2,⁴I_13/2, and Yb³⁺ ions from the ground state ²F_7/2 to ²F_5/2 absorption transition. J-O theory has been calculated using phenomenological intensity parametersΩ_t,Ω₂ in 7.04 7.52,Ω₄ in 1.67 1.96,Ω₆ in 1.05 1.24; Calculate the Er³⁺ ions in this experiment, samples of spontaneous emission transition probability, fluorescence branching ratio and radiative lifetime, calculated using the McCumber theory to achieve emission cross section 0.84pm².1.5μm Department test samples in the fluorescence spectra, the fluorescence peak wavelength of sample has not changed, both 1534nm; fluorescence intensity with the Yb³⁺ ion concentration increase in size after the first reduction in the maximum E5 samples, fluorescence FWHM can be achieved 38nm; prepared in this experiment phosphate glass PBAZN series Yb³⁺: Er³⁺ the best ratio of 12:1. Get Up-conversion emission spectra of three, we can see peaks at 522, 545, 651nm, in the E5 the green strength of samples is a single erbium-doped to about 5 times, red light intensity of 3 times.E5 by 10mol% of samples of formula Bi₂O₃ added to modify the experiment, glass density, refractive index, thermal stability have been a certain increase in fluorescence spectroscopy through testing found that the post-doped bismuth oxide bismuth phosphate glasses in the 1544nm peak to move the long-wave; fluorescence FWHM for the 48nm.Increasing the melting temperature of the glass have a certain role in the removal, the samples obtained by fluorescence lifetime is quite satisfactory.