飞秒(英语:femtosecond)是一种时间的国际单位,为10-15秒(1秒钟的11 000 000 000 000 000)、1000阿秒或0.001皮秒(1皮秒是10-12秒)。在一飞秒中可以在真空内传播0.3微米可见光的振荡周期为1.30到2.57飞秒。

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