Effect of pulse duration on generation of attosecond pulse with coherent wake emission Project supported by the National Natural Science Foundation of China (Grant Nos. 91950203, 11874374, and 61690223) and the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDB16)

High-order harmonics and attosecond pulse generation with coherent wake emission are theoretically investigated for the effect of pulse duration and carrier envelope phase (CEP) of few-cycle laser pulse. We find that short pulse duration will cause the negative chirp for the high harmonics. When the laser pulse is shortened to a few cycles, the influence of the laser CEP on the chirp of the harmonics will also become more prominent. [ABSTRACT FROM AUTHOR]