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由于变象管存在时间畸变,使萤光屏上的扫描象变弯。在皮秒变象管中曾采用球面阴极球面网暂时缓和了这一矛盾。但在飞秒技术中若继续延用上述方法,在变象管的制造工艺上是难以实现的。为此,我们设计了一个能校正时间畸变的狭缝成象镜头。即在入射狭缝后加入一个正场镜,使光阴极上高度为7mm的狭缝象的最大时间畸变为-3.5ps,从而达到了与变象管上正的时间畸变相抵消的目的。系统补偿时间畸变后其最大剩余量小于0.1ps。
Due to the distortion of the image tube for a long time, the scanning image on the fluorescent screen is bent. In the picosecond vortex tube once used spherical cathode spherical net temporarily alleviate this contradiction. However, if the femtosecond technology continues to extend the above method, it is difficult to realize the manufacturing process of the image tube. For this reason, we designed a slit imaging lens that can correct the time distortion. That is to say, after adding a positive-field mirror into the incident slit, the maximum time distortion of the slit image with a height of 7 mm on the photocathode is -3.5 ps, so as to achieve the purpose of offsetting the positive time distortion on the image tube. System compensation time distortion after the maximum remaining less than 0.1ps.