In the frame of the unified expansion theory(UET) we obtain the higherprecision expressions of the UET by means of improving the accuracy of calculation,andthen extend it to the laser systems.

• 在统一展开理论(UET)的框架内，通过提高推导过程中的精度，得到了更精确的结果，且将其推广应用到激光系统中。