再者，提出了一种新的使用光栅刻线进行成像系统精度标定的方法。
The third step, a new method of high-precision calibration with grating grooves is presented for the optical imaging system.
给出了用于评价光栅刻线弯曲程度的表达式，并推导出了它的积分形式，使计算效率提高了2 ~ 3倍。
The integral expression of the merit function was also derived to improve the calculation efficiency. The calculation result shows that the latter efficiency is 2 to 3 times of the former.
结果表明，当光栅对刻线失配时，且只考虑二阶色散的影响时，初始啁啾导致脉冲宽度小于无初始啁啾脉冲的宽度。
The simulations show that when the grating grooves are unparallel, the original chirp leads to the pulse width smaller only considering GDD.
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