Kavli Affiliate: Feng Wang
| First 5 Authors: Feng Wang, Feng Wang, , ,
| Summary:
High-order harmonic generation (HHG), a robust tabletop source for producing
attosecond pulses, has been extensively utilized in attosecond metrology.
Traditionally, HHG driven by classical laser fields involves two typical
quantum paths (short and long quantum paths) contributing to harmonic emission.
Here, we demonstrate that these quantum paths in HHG can be selectively
controlled using squeezed lights, a form of non-classical light. Our results
indicate that the long (short) quantum path of HHG will be dramatically
suppressed in the phase (amplitude)-squeezed fields. The time-frequency
analysis reveals that this quantum path control stems from the quantum
fluctuations in the squeezed light, which modify the phase matching of harmonic
emission from different quantum states of the squeezed light. Such a quantum
path selection can be achieved for the whole harmonic plateau, which has great
potential to generate ultrashort isolated attosecond pulse with duration less
than one atomic unit of time.
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