A method and device for generating ellipsometric attosecond pulses

Abstract

The invention discloses a method and a device for generating elliptically polarized attosecond pulses. A double-color laser field obtained by superposing the linearly polarized laser and the circularly polarized laser interacts with polar gas molecules, and an electric field parameter of the double-color laser field is calculated and adjusted by utilizing a three-dimensional time-containing schrodinger equation, so that the interaction generates higher harmonics; by adjusting the intensity ratio of the double-color laser field, the generated higher harmonics have the ellipsometry rate larger than the preset ellipsometry rate value in the cut-off region; and the higher harmonics with the ellipsometry rate larger than the preset ellipsometry rate value are synthesized into the attosecond pulse, and the ellipsometry rate of the attosecond pulse is regulated and controlled by adjusting the relative phase of the double-color laser field. According to the invention, high enough harmonic efficiency is ensured, and then elliptically polarized harmonic waves in a cut-off region are synthesized into high-efficiency elliptically polarized isolated attosecond pulses. Besides, the method can realize regulation and control of the rotatability and ellipsometry rate of the isolated attosecond pulse by adjusting the relative phase of the double-color field, and is a practical method for generating and adjusting the ellipsometry isolated attosecond pulse.

Description

technical field [0001] The invention relates to the field of ultrafast laser technology, and more specifically, to a method and device for generating ellipsometric attosecond pulses. Background technique [0002] Attosecond science is a new field that people are exploring, in which the generation and application of isolated attosecond pulses is very important. Research on attosecond pulse synthesis technology based on high-order harmonics has aroused great interest and attention in recent years. [0003] At the beginning of this century, scientists synthesized sub-femtosecond pulses experimentally for the first time through high-order harmonics (M.Hentschel, et al., Nature 2001, 414: 509 and P.M.Paul, et al., Science, 2001, 292( 5522): 1689-1692.), which became a symbol of the development of ultrafast laser technology from the field of femtoseconds to the field of attoseconds. After nearly two decades of development, the pulse width of attosecond pulses has gradually excee...

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Problems solved by technology

[0006] In view of the defects of the prior art, the purpose of the present invention is to solve the problem that the ellipticity of the existing high-order harmonics generated by arranging non-polar molecules is relatively low, and the high-order harmonics of adjacent orders present anti-handedness, so that Attosecond pulses based on ellipsometric high-order harmonic synthesis are still linearly polarized, and the high-order harmonics radiated in the prior art have low efficiency, which limits the technical problems of attosecond pulse energy

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