Monopulse two-dimensional spectrum device

A two-dimensional spectroscopy, single-pulse technology, applied in the field of laser spectroscopy, can solve the problems of inability to detect irreversible processes, complex optical paths of the device, difficult construction, etc., to simplify the construction difficulty, shorten the acquisition time, and facilitate the popularization of technology.

Inactive Publication Date: 2021-08-24
BEIJING NORMAL UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problems of complex optical path of the above-mentioned device, difficult construction, point-by-point collection, long time-consuming, high cost, and inability to detect irreversible processes

Method used

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  • Monopulse two-dimensional spectrum device
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  • Monopulse two-dimensional spectrum device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The single-pulse two-dimensional spectroscopy device is used to collect spatially encoded two-dimensional spectral data (such as figure 1 shown):

[0026] 1. Use a wide bandwidth and narrow pulse width femtosecond laser generated by a nonlinear optical parametric amplifier or other broadband femtosecond laser generation device as a light source, and divide it into two parts: pump light and probe light through a beam splitter 1, about 100 One part of the reflected light is used as probe light, and the rest is transmitted as pump light. The probe light, as pulse 3, is incident on the optical delay line 14 through the steering mirror. The optical delay line is used to compensate the optical path difference between the pump and probe light, and to generate a positive time delay in the experiment.

[0027] 2. The pump light transmitted through the beam splitter 1 is divided into two parts by a half mirror 2 again, the reflected light is used as pump pulse 1, and the transmi...

Embodiment 2

[0032] The first preferred example of the above-mentioned single pulse two-dimensional spectroscopy device (such as image 3 shown):

[0033] 1. Place the half-wave plate 16 and the polarizer 17 in sequence after the Fresnel wedge to form a polarization controller. By rotating the polarizer 17, you can select the polarization direction of the pump light you want, and change it by rotating the half-wave plate 16. The magnitude of the total pump energy transmitted through the polarizer.

[0034] 2. In the detection optical path, a half-wave plate 18 and a polarizer 19 are also placed before the optical delay line 14 to form a polarization controller. By rotating the polarizer 19, the desired polarization direction of the probe light is selected. To change the magnitude of the detected light energy passing through the polarizer.

[0035] 3. When the combination of half-wave plate and polarizer is only used to change the beam energy and not to determine the polarization direction,...

Embodiment 3

[0037] The second preferred example of the above-mentioned single pulse two-dimensional spectroscopy device (such as Figure 4 shown):

[0038] 1. will attach figure 1 The variable density attenuation plate 4 used to balance the energy of the pump pulse in the medium-wavefront spatial encoding component is replaced by a polarization controller composed of a half-wave plate 20 and a polarizer 21 . The polarization direction of the pump pulse is selected by rotating the polarizer 21 , and the fine balance of pump pulse energy is adjusted by rotating the half-wave plate 20 .

[0039] 2. Will figure 1 The variable density attenuation plate 5 used to balance the pump pulse energy in the mid-wavefront spatial encoding component is replaced by a polarization controller composed of a half-wave plate 22 and a polarizer 23 . The polarization direction of the pump pulse is selected by rotating the polarizer 23, and the fine balance of pump pulse energy is adjusted by rotating the half...

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Abstract

The invention relates to a monopulse two-dimensional spectrum device which can be used for an ultrafast two-dimensional spectrum experiment and belongs to the technical field of ultrafast laser spectrum. According to the invention, an improved pumping detection light path structure is used, the light path of the two-dimensional spectrum device is simplified, and the technical difficulty is reduced; the system internally comprises an autonomously designed wavefront space coding assembly, the wavefront of a pulse pair has a relative inclination angle by changing the mode of pulse wavefront space inclination, the relative inclination angle is used for space coding of a pulse time sequence, and it is possible to measure multiple time points at a time; according to the invention, the problems of complex light path, high technical difficulty, long acquisition time and incapability of detecting an irreversible process in a traditional two-dimensional spectrum device are solved, and monopulse acquisition of the two-dimensional spectrum is realized.

Description

technical field [0001] The invention is a single-pulse two-dimensional spectrum device based on wavefront space encoding technology, which belongs to the technical field of laser spectroscopy. Background technique [0002] Ultrafast two-dimensional spectroscopy is a detection method in the field of spectroscopy that can detect chemical reactions, molecular dynamics and fine structures from the femtosecond ultrafast time scale. The two-dimensional spectroscopy device currently used mainly consists of four laser beams focused on the sample surface from different directions in space, the relative delay between the laser pulses is controlled by multiple stages, and the acquisition is obtained through long-term acquisition and precise control of the stage. 2D spectral image. This device mainly has several insurmountable problems: First, the construction of the optical path is complicated, and usually requires personnel with rich experimental experience in this field to complete,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01J3/02G01N21/01G01N21/39
CPCG01J3/0205G01N21/01G01N21/39
Inventor 周梁张文凯岳佳宁
Owner BEIJING NORMAL UNIVERSITY
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