Study on Vacuum Thermal Polarization of Er-doped Fused Silica Glass by Corrosion

It is reported that due to the use of vacuum polarization, the externally provided H is limited due to the second-order non-linear effects of Erbium-doped silica fibers. After all the polarization regions are entered, an anion region is formed under the anode surface, thus forming a polarization. The positive and negative forms of ion layer distribution in the zone, while the electric field has two peaks at the anode surface and the interface between the positive ion layer and the second negative ion layer, and the interface between the positive ion layer and the second negative ion layer (x =5.5Mm) is the center position. Gauss I and Gauss 2 Gauss functions are used to superimpose and obtain the internal electric field simulation map of the polarized region. For the Gauss I function, the half width at the peak height 1/e is taken as 3Mm, which is the leftmost position. The width of 1 peak; For the Gauss I function, the half-width at the peak height 1/e is taken as 3.5m, and the width of the second peak in the polarized silica glass is 6mm point group symmetry, and the incident light is p-polarized, so Obtain d (f = d33s5 (9 is the light propagation angle inside the quartz glass); Let x be the coordinate axis of the origin on the anode plane parallel to the direction of the applied electric field, then the propagation length of the light in the quartz glass / = x / cs; 4c(n2k-nk)A Quartz Glass Second Harmonic Signal The conversion efficiency is Z(0)=/2k(0)//k(0), and the formula can be derived because of d33Ein: the ion layer distribution in the polarized region obtained by the etching method and the dual Gauss model simulation polarization The correct ten sections of the electric field in the area. 4 Conclusions The HF etching treatment of the section of the vacuum-heat-polarized Er-doped fused silica sheet shows that a peak-to-valley corrosion pattern appears in the section polarization area, due to positively-charged ions in the polarization area. The corrosion rate of the layer is faster than that of the unpolarized region, and the negative ion layer corrosion rate is slower than that of the non-polarized region. Therefore, we have deduced that the ion layer distribution in the polarization region is negative-negative and negative, which is consistent with the multi-carrier model for the vacuum hot-pole. The interpretation of the chemistry is consistent; according to the distribution of the ion layer, the double Gauss model is used to simulate the internal electric field in the polarized region and the theoretical Maker fringe that matches the experiment is obtained, verifying that the ion layer and the electric field in the polarized region are determined by the etching method. From the above analysis, it can be seen that the corrosion method is an important method for studying the polarization of quartz glass, which is of great help in further understanding the polarization process. In addition, the conclusion of this experiment can be used to guide the polarization of the optical fiber to achieve the best polarization The effect of changing the polarization conditions is to make the peak of the electric field in the polarization zone fall within the core of the optical fiber as much as possible, so that the second-order nonlinear coefficient of the core region is maximized, which can be achieved by the method of corroding the position of the polarization region.

Thanks to Professor Sun Taoheng and Associate Professor Xing Qijiang of the School of Physics of Peking University for their criticisms and corrections.

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