在显微物镜的成象光路中，增加一块振荡反射镜，使被测线宽的放大象相对窄缝扫描，将光学边界信息转变为梯形电脉冲。
Bying adding an oscillator mirror in the imaging path, thus the enlarged image will be scanned by the narrower slit, and the optical boundary information is converted into gradient electrical pulse.
推导了被测线宽与光学性能参数，结构参数，振荡频率以及高频矩形脉冲数之间的函数关系式。
Functional relations between measured linewidth and optical parameters, structural parameters, oscillator coil and high-frequency rectangular pulse Numbers have been derived in the paper.
结果表明：在不考虑激光线宽及消相碰撞时，探测场的吸收随时间在零吸收附近作类似于阻尼减幅振荡，系统可实现无反转放大；
It is shown that the time-dependent probe absorption is oscillatorily damped to its steady state and transient amplification without inversion can be realized;
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