Ultra-short pulse diagnostic method based on molecular arrangement and orientation

A technology of molecular arrangement and diagnostic method, applied in the direction of instruments, etc., can solve the problems of limited pulse bandwidth, measurement frustration, limited application range of nonlinear crystal wavelengths, etc., and achieves the effect of simple device and cost reduction.

Inactive Publication Date: 2010-08-11
EAST CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

First of all, under normal circumstances, the nonlinear process requires that the light pulse to be measured must have sufficient light field strength, so it is quite helpless for the measurement of very weak light pulses
Secondly, the nonlinear process is also limited by the bandwidth of the nonlinear crystal phase matching, so the pulse bandwidth that can be accurately measured

Method used

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  • Ultra-short pulse diagnostic method based on molecular arrangement and orientation
  • Ultra-short pulse diagnostic method based on molecular arrangement and orientation
  • Ultra-short pulse diagnostic method based on molecular arrangement and orientation

Examples

Experimental program
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Effect test

Example Embodiment

[0031] Example 1:

[0032] In this embodiment, the pump alignment light and the pulse of the light to be measured are propagated collinearly, and it is suitable for the wavelength of the pulse to be measured which is different from the wavelength of the pulse of the pumped alignment light. The advantage of this example is that the collinear transmission enhances the mutual It can improve the resolution and sensitivity of the system, and the noise of the orientation pump light can be removed by the filter. This embodiment is not applicable to the case where the wavelengths of the light pulse to be measured and the pump light are similar, and in this case, the background introduced by the pump light cannot be eliminated.

[0033] attached figure 1 is N 2 One-dimensional orientation periodogram of the molecule, proposed to use N 2 The orientation peaks of the 3 / 4 period of molecular orientation were measured for the characteristics of supercontinuum white light. attached f...

Example Embodiment

[0034] Example 2:

[0035] This embodiment is non-collinear propagation of the pump alignment light and the light pulse to be measured, which is generally applicable to the case where the wavelength of the light pulse to be measured is similar to or different from the wavelength of the pulse of the pump alignment light, and is also suitable for the diagnosis of supercontinuous white light characteristics. The advantage of this example is that the non-collinear propagation can spatially resolve the pump light and the light to be measured, without using filters, which reduces the loss of the spectrum; the disadvantage is that the non-collinear propagation reduces the interaction area of ​​the two beams .

[0036] attached image 3 In the schematic diagram of the structure of this embodiment, the pump alignment light and the light pulse to be measured are combined at the beam splitter BS and then transmitted non-collinearly, and the half-wave plate is used to adjust the polariza...

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Abstract

The invention belongs to the technical field of ultra-fast laser science and precise measurement, in particular to a method for measuring ultra-short pulse amplitudes and phases on the basis of molecular arrangement and orientation. The method utilizes a laser pulse to realize the arrangement and orientation of gas molecules and utilizes a molecular arrangement and orientation signal as a shutter pulse, a weak-light polarization detection method based on the molecular arrangement and orientation utilizes a computer to precisely control the laser pulse and the time delays of the laser pulse to be measured so as to measure a transmission two-dimensional figure that the laser pulse to be measured passes through the arranged and orientated gas molecules under different time delays, thereby obtaining the amplitudes, the phases and the frequency features of the laser pulse to be measured. The invention has the advantages that a non-linear crystal does not need to be used so that the cost is saved, and the method has no need of taking restrictive factors comprising phase matching conditions, wavelength matching conditions, matching light strength and the like needing to be satisfied in the non-linear process into account.

Description

technical field [0001] The invention belongs to the technical field of ultrafast lasers, and in particular relates to an ultrashort pulse diagnosis method based on molecular alignment and orientation for measuring the amplitude and phase of ultrashort pulses. Background technique [0002] The diagnosis of ultrashort laser pulses, including the measurement of pulse amplitude and phase, is a very critical technical issue in ultrafast laser science. The traditional autocorrelation method can only measure the width or amplitude of the pulse but cannot measure the specific phase or chirp information of the pulse, so it cannot give a more accurate understanding of the ultrashort laser pulse. The phase is an extremely important parameter to describe the laser pulse. Mastering the phase information of the femtosecond laser pulse enables people to understand the chirp characteristics of the ultrashort pulse laser, so that pulse diagnosis and effective phase compensation can be perfor...

Claims

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Application Information

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IPC IPC(8): G01J11/00
Inventor 刘佳吴健陆培芬杨旋蔡华曾和平
Owner EAST CHINA NORMAL UNIVERSITY
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