Generation of 88 as Isolated Attosecond Pulses with Double Optical Gating**Supported by the National Key Research and Development Program of China under Grant No. 2019YFA0307703, the Major Research Plan of the National Natural Science Foundation of China under Grant No. 91850201, and the National Natural Science Foundation of China under Grant No. 11974426.

Abstract

Isolated attosecond pulses with a duration of 88 as are generated in the spectral range of 29–72 eV using double optical gating technique. The gate width is set to be shorter than half the optical cycle to avoid carrier envelop phase stabilization of the 4.2 fs driving laser pulses centered at 800 nm. The attosecond pulse duration is measured with the technique of frequency resolved optical gating for complete reconstruction of attosecond bursts.