研究目的
To study high order harmonics and attosecond pulse generation from a hydrogen molecular ion (HMI) with different internuclear distances, R, using coherent superposition of multicolor continuous wave beams.
研究成果
The study concludes that attosecond pulse generation from HMIs is most efficient for internuclear distances around 5 a.u. when using driving laser pulses with a spectral width of approximately 0.03 a.u. The attosecond pulse durations are found to be insensitive to both the spectral width of the driving laser field and the internuclear distance, remaining around 16 attoseconds in optimal conditions.
研究不足
The study is theoretical and does not account for experimental uncertainties or variations in laser pulse characteristics beyond the specified parameters. The one-dimensional model may not fully capture all aspects of the three-dimensional dynamics of the HMI.
1：Experimental Design and Method Selection:
The study involves the theoretical investigation of high order harmonics and attosecond pulse generation from HMIs exposed to broadband femtosecond laser pulses. The methodology includes solving the one-dimensional time-dependent Schr?dinger equation under the Born–Oppenheimer and dipole approximations.
2：Sample Selection and Data Sources:
The target is a hydrogen molecular ion (HMI) with internuclear distances, R, ranging from 1 to 10 atomic units (a.u.).
3：List of Experimental Equipment and Materials:
The study is theoretical and does not involve physical equipment. However, it considers the interaction of HMIs with broadband femtosecond laser pulses of intensity 400 TW cm?
4：Experimental Procedures and Operational Workflow:
The process involves the superposition of multicolor continuous wave beams to generate femtosecond pulses, which are then used to study the ionization and harmonic generation in HMIs.
5：Data Analysis Methods:
The analysis includes the calculation of ionization probabilities, harmonic spectra, and attosecond pulse generation using Fourier and Morlet-wavelet transforms of dipole acceleration.
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