High-order harmonic generation (HHG) of an atom in a strong laser field provides a broad spectral bandwidth for attosecond pulse synthesis. However, due to complex electron dynamics in the atom, usually only a part of the HHG can be used for the synthesis of the attosecond pulse, which significantly limits the attosecond pulse width. In this work we theoretically study the synthesis of attosecond pulses from high-order harmonics generated by intense squeezed light. It is found that, unlike the coherent light, the whole HHG spectrum can be effectively used to synthesize attosecond pulses. By developing strong-field approximation theory in squeezed light, this is attributed to substantial suppression of long and multireturn electron trajectories at the single-atom level. Based on this novel scheme using intense squeezed light, we show that an isolated attosecond pulse can be synthesized from the entire HHG spectrum, and the pulse width is much shorter than that from the coherent light with the same laser parameters.

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• Atomic & molecular processes in external fields
• High-order harmonic generation