Device for generating orthogonal polarized double-color laser field

Abstract

The invention discloses a device for generating an orthogonal polarized double-color laser field. The device comprises a femtosecond laser, wherein a beam splitting sheet is arranged at the outlet of the femtosecond laser; a light beam is divided into two beams by the beam splitting sheet; one light beam enters a planar reflector time delay device, and then is emitted into a first focusing lens; the other light beam sequentially passes by a 1 / 2 slide and a frequency doubling crystal and then emerges; a first planar reflector is arranged on an emergent light path; a second focusing lens is arranged on the emergent light path of the first planar reflector; the light beam is focused by the second focusing lens, and then is emitted into a second planar reflector; the light beam is reflected by the second planar reflector, and then enters an air box; and the air box is connected with a high-order harmonic generation and detection device. The device for generating the orthogonal polarized double-color laser field can freely adjust an angle of a combined beam consisting of two light beams, and keep a spatial position unchanged when a laser focus and an air medium are interacted with eachother; therefore, on the time, a long electronic trace can be filtered; on the space, a short electronic trace can be retained; and the short electronic trace can be obtained to the greatest extent.

Description

technical field [0001] The invention relates to the technical field of laser generating devices, in particular to a device for generating orthogonally polarized two-color laser fields that can be optimally controlled synchronously in time and space. Background technique [0002] In recent years, high-order harmonics have gradually become a frontier research topic in the field of strong field physics in the world due to its wide application prospects. Due to the unique advantage that the radiation spectrum presents a platform area and the harmonics in the platform area have a regular distribution of equal frequency intervals, high-order harmonics are widely used in research to obtain attosecond pulses. Through the acquisition of attosecond pulses, humans can measure various atoms, The movement process of the inner electrons in the molecular medium, detecting the dynamics of the bound state and the continuous state electrons under a strong field; high-order harmonics can also ...

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Problems solved by technology

Although these two methods can collect short electron trajectories to a large extent, there is still the influence of long electron trajectories, which still has a great impact on the effective acquisition of precise single attosecond pulses and the improvement of their energy conversion efficiency

[0005] In addition, most of the existing two-color laser fields adopt the method of fixing the angle between the two laser beams. If the angle needs to be adjusted during the work process, the optical path of the two beams will be changed, which requires not only accurate calculation, but also the adjustment of the experimental device It is very cumbersome to keep the spatial position of the laser focus unchanged while changing the angle between the two beams

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