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Phase reconstruction method in two-dimensional Fourier transform electronic spectrum

A technology of Fourier transform and electronic spectroscopy, which is applied in the field of phase reconstruction in two-dimensional Fourier transform electronic spectroscopy, can solve problems such as small phase errors, and achieve the effect of eliminating the spectral phase slope

Inactive Publication Date: 2017-05-31
SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI
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Problems solved by technology

The problem, however, is that such methods of phase determination do not operate in the nonlinear interaction region of the sample, where transmission effects in the sample may introduce small phase errors

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  • Phase reconstruction method in two-dimensional Fourier transform electronic spectrum
  • Phase reconstruction method in two-dimensional Fourier transform electronic spectrum
  • Phase reconstruction method in two-dimensional Fourier transform electronic spectrum

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[0057] The following describes the implementation of the present invention through specific specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and the features in the embodiments can be combined with each other if there is no conflict.

[0058] It should be noted that the illustrations provided in the following embodiments only illustrate the basic idea of ​​the present invention in a schematic way. The figures only show the components related to the present invention instead of the number, shape and actual implementation of the com...

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Abstract

The invention provides a phase reconstruction method in a two-dimensional Fourier transform electronic spectrum. The method at least comprises the following steps: carrying out inversion calculation on spectral interference and an inverse Fourier transform on a frequency modulated interference spectrum D(omega t, tau), filtering off direct current and alternating current terms in a time domain, then carrying out a discrete Fourier transform on the alternating current term to retrieve frequency domains, regaining S0 (omega t) and f (omega t), and calculating through S0 (omega t) and f (omega t) to obtain amplitudes of local oscillation pulses and amplitudes and phases of photon echo signals. According to the invention, phase error sources are analyzed and inquired to find that phase errors of 2DES (Two-Dimensional Electronic Spectroscopy) have some relevance to zero delay determining errors of coherence time and detection, time linear dependence of coherence and phases on an emission axis along with emission frequencies is effectively eliminated, and a real two-dimensional absorption spectrum is further reconstructed.

Description

Technical field [0001] The invention relates to the field of phase correction of spectrometers, in particular to a phase reconstruction method in two-dimensional Fourier transform electronic spectroscopy. Background technique [0002] As an effective detection method in ultrafast spectroscopy, two-dimensional electronic spectroscopy (Two-Dimensional Electronic Spectroscopy, 2DES) has been successfully used to detect the ultrafast dynamics information of a series of basic processes such as electronic and vibration coupling in complex systems. However, there are still three major technical challenges in the specific implementation of two-dimensional electronic spectroscopy: First, because the excitation wavelength ranges from ultraviolet to near-infrared, it is very difficult to achieve phase stability in the sub-wavelength range. However, for this problem, some Complex and sophisticated device design to solve the problem, mainly including passive phase stabilization and active pha...

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Application Information

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IPC IPC(8): G01J3/28
CPCG01J3/28
Inventor 江玉海张凯旋张逸竹孟秋香
Owner SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI
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