One of the main factors of laser induced damage is the modulation to incident laser which is caused by the defect in the subsurface of the fused silica. In this work, the repaired damage site irradiated by CO2 laser is simplified to a Gaussian rotation according to the corresponding experimental results. Then, the three-dimensional finite-difference time-domain method is employed to simulate the electric field intensity distribution in the vicinity of this kind of defect in fused silica front subsurface. The simulated results show that the modulation is notable, the Emax is about 2.6 times the irradiated electric field intensity in the fused silica with the damage site (the width is 1.5 μm and depth is 2.3 μm) though the damage site is repaired by CO2 laser. The phenomenon and the theoretical result of the annular laser enhancement existed on the rear surface are first verified effectively, which agrees well with the corresponding experimental results. The relations between the maximal electric field intensity in fused silica with defect depth and width are given respectively. Meanwhile, the corresponding physical mechanism is analysed theoretically in detail.
Irradiation effects of CO 2 laser parameters on surface morphology of fused silica * Xiang Xia(向 霞) a)b) , Zheng Wan-Guo(郑万国) a) , Yuan Xiao-Dong(袁晓东) a) † , Dai Wei(戴 威) a)b) , Jiang Yong(蒋 勇) a)b) , Li Xi-Bin(李熙斌) a) , Wang Hai-Jun(王海军) a) , Lü Hai-Bing(吕海兵) a) , and Zu Xiao-Tao(祖小涛) b)a)
In this paper we study the gain saturation induced mode-coupling control in solid state ring laser devices based on the stimulated Raman effect of the polar crystals in order to realize solid state ring laser gyroscopes. We theoretically investigate the mode coupling induced by gain saturation between clockwise (CW) and counterclockwise (CCW) propagating laser modes. Because the CW and CCW running waves are pumped with counter-propagating lasers respectively, the independent coexistence can be ensured.
Bright blue photoluminescence from a mixed tin and manganese oxide xerogel prepared via sol hydrothermal gel processLiu Chun-Ming( ) a) , Zhou Wei-Lie( ) c) , and Zu Xiao-Tao ( ) a)
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