Generation of double attosecond pulses with the same intensity and carrier-envelope phase

Navid, Ali; Aghbolaghi, Reza; Majidi, Soheila

doi:10.47176/ijpr.24.1.01768

Generation of double attosecond pulses with the same intensity and carrier-envelope phase

Document Type : Original Article

Authors

Ali Navid

Reza Aghbolaghi

Soheila Majidi

Department of laser and optical engineering, University of Bonab, Bonab, Iran

https://doi.org/10.47176/ijpr.24.1.01768

Abstract

In this paper, we theoretically study the generation of double attosecond pulses with the same intensity, a similar carrier-envelope phase, and controllable duration with arbitrary time delay. The desired pulses are generated in a high harmonic generation process on the interaction of a pulsed femtosecond driver laser by asymmetric molecular ion HeH²⁺. High harmonic generation is investigated by numerical solving the one -dimensional- time dependent Schrödinger equation. To find out the optimized diving laser parameters an appropriate cost function is defined in genetic algorithm. The frequency spectrum of the desired pulses is selected from an appropiate part of high harmonics using a spectral filter. We show that the two mentioned pulses are generated at the time interval of one cycle of the laser electric field of the driving laser when the field direction is antiparallel to the molecule's permanent dipole moment. Finally, by calculating the characteristics of the generated pulses and comparing them with the desired ones, the efficiency of the presented method is fully confirmed.

Keywords

attosecond pulses

high harmonic generation

asymmetric molecule

carrier-envelope phase

Subjects

Atomic and Molecular Physics

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