缓变幅近似
It is well known that there is apparent inconsistence or paradox in the conventional theory of laser optics due to the assumed paraxial approximation or assumption of slowly varying amplitude.
众所周知,传统激光光学理论,由于采用了傍轴近似或缓变振幅近似,存在明显的不自洽性和佯谬;
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