The electromagnetic solitary waves of q-Gaussian laser beam in a preformed parabolic plasma channel is investigated by means of the variational method.Compared with the electromagnetic solitary waves of Gaussian laser beam,the results show that there exist two kinds of electromagnetic solitary solutions for q-Gaussian laser beam in a preformed plasma channel,i.e.,the focusing and the defocusing electromagnetic solitary wave solutions.In the same laser amplitude and plasma background,the laser beam with lower q has a larger amplitude and a poorer numerical stability for the focusing electromagnetic solitary waves.However,for the defocusing solitary waves,the results are just opposite.%利用变分法研究了q-高斯激光束在抛物预等离子体通道中传播的电磁孤立波,并与高斯激光的电磁孤立波进行了对比.结果表明:q-高斯激光束在抛物预等离子体通道中有两种电磁孤立波解,即聚焦电磁孤立波解和散焦电磁孤立波解.在相同的激光振幅和同一等离子体背景下,低q值激光束的聚焦电磁孤立波的振幅较大,数值稳定性较差,而散焦电磁孤立波与之相反.
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