Isolated attosecond pulse generation with few-cycle two-color counter-rotating circularly polarized laser pulses**Project supported by the National Natural Science Foundation of China (Grants Nos. 61690223, 11561121002, 61521093, 11227902, 11404356, and 11574332) and the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDB16).

Abstract

Most of the schemes for generating isolated attosecond pulses (IAP) are sensitive to the carrier-envelope phase (CEP) of the driving lasers. We propose a scheme for generating IAP using two-color counter-rotating circularly polarized (TCCRCP) laser pulses. The results demonstrate that the dependence of the IAP generation on CEP stability is largely reduced in this scheme. IAP can be generated at most of CEPs. Therefore, the experiment requirements become lower.