【摘要】 利用变分法研究了1+1维傍轴高斯光束在含有小损耗的强非局域非线性介质中的传输特性,得到了光束各参量的演化方程、束宽的演化规律和一个临界功率。在介质损耗足够小的前提下,当光束初始功率等于临界功率时,得到了一个束宽随传输距离缓慢展宽的准空间光孤子——损耗空间光孤子;当光束初始功率小于临界功率时,光束束宽则按雅可比椭圆正弦函数和椭圆余弦函数作准周期展宽变化;当光束初始功率大于临界功率时,光束束宽将从按雅可比椭圆正弦函数和椭圆余弦函数作准周期压缩变化过渡到按雅可比椭圆正弦函数和椭圆余弦函数准周期展宽变化。更多还原

【Abstract】 The propagation property of 1+1 dimensional Gaussian optical beam is investigated in small lossy strongly nonlocal nonlinear media by means of variational method.The evolution equations of the parameters,the beam width evolution law and a critical power are obtained for the beam.In the case of small loss,a lossy optical spatial soliton with beam width slow diffraction is found when the input power equals the critical power.When the input power is smaller than the critical power,the beam width takes quasi-periodical diffraction with the Jacobian elliptic sine and elliptic cosine functions.When the input power is larger than the critical power,it changes from quasi-periodical contraction to diffraction with the same functions.更多还原