飞秒(英語:femtosecond)是一種時間的國際單位,为10-15秒(1秒鐘的1⁄1 000 000 000 000 000)、1000阿秒或0.001皮秒(1皮秒是10-12秒)。在一飞秒中光可以在真空内传播0.3微米,可见光的振荡週期为1.30到2.57飞秒。
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