Terahertz-driven sub-femtosecond time-resolved streak camera

A technology of time resolution and streak camera, which is applied to devices and instruments for measuring time intervals, can solve the problems of power drive system and limited time resolution, and achieve good synchronization, order of magnitude improvement, and simple structure

Active Publication Date: 2017-02-22
XI'AN INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The device uses a radio frequency cavity (rf cavity) to deflect high-energy electrons, but the phase jitter between the radio frequency field and the electron pulse limits the time resolution in

Method used

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  • Terahertz-driven sub-femtosecond time-resolved streak camera
  • Terahertz-driven sub-femtosecond time-resolved streak camera
  • Terahertz-driven sub-femtosecond time-resolved streak camera

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Experimental program
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Effect test

Embodiment 1

[0034] Such as figure 1 with figure 2 As shown, the streak camera includes a femtosecond laser 32, a beam splitter 33, an ultraviolet light pulse generator 34, a DC electron gun, a DC gun magnetic focusing device 10, a deflection system 35, a phosphor screen 16 and an EBCCD camera 17;

[0035] The femtosecond laser light emitted by the femtosecond laser 32 (a) passes through the beam splitter 33, and one femtosecond laser enters the ultraviolet laser pulse generator 34, and the other femtosecond laser (b) enters the deflection system 35;

[0036] The DC electron gun includes a DC electron gun chamber 5, a first lens 4, a cathode assembly, and an anode 9. The front end of the DC electron gun chamber 5 is equipped with a first lens 4, and the rear end is provided with an anode 9; the DC electron gun chamber 5 is equipped with a cathode assembly; a cathode The assembly and the anode 9 generate an accelerating electric field; the cathode assembly includes a cathode frame 6, a metal cat...

Embodiment 2

[0044] The present invention can not only be used to characterize non-relativistic electrons accelerated by a DC gun, but also characterize the time characteristics of relativistic ultrafast electron pulses. The specific implementation is to use an RF acceleration gun to accelerate the electron beam. image 3 Shown is the schematic diagram of the RF accelerator gun,

[0045] A femtosecond laser pulse (a) is generated by an ultraviolet light pulse generator. The ultraviolet light pulse passes the ultraviolet laser pulse through the second vacuum flange 19 (the second vacuum flange is evenly distributed outside the laser chamber, a total of four A) is introduced into the laser chamber; the ultraviolet light pulse 3 is reflected and irradiated on the photocathode 21 in the radio frequency chamber 22 by the reflector 18 in the laser chamber 20, and the external photoelectric effect occurs, which is caused by the super light pulse with the same time and space distribution. The fast ele...

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Abstract

The invention belongs to the field of ultrafast diagnosis, and particularly relates to a terahertz-driven sub-femtosecond time-resolved streak camera. The camera comprises a femtosecond laser device, a beam splitter, an ultraviolet laser pulse generation device, an electronic gun, a magnetic focusing device, a deflection system, a fluorescent screen and an EBCCD camera; after femtosecond laser emitted by the femtosecond laser device passes through the beam splitter, one femtosecond laser beam enters the ultraviolet laser pulse generation device, and the other femtosecond laser beam enters the deflection system; the electronic gun is used for converting ultraviolet laser pulses generated by the ultraviolet laser pulse generation device into electronic pulses and accelerating the electronic pulses; the magnetic focusing device is installed between the electronic gun and the deflection system; the EBCCD camera is installed at the position, directly facing the fluorescent screen, outside a main vacuum chamber. According to the streak camera, the time characteristics of the non-relativistic and relativistic ultrafast electronic pulses can be detected, and the resolution can reach the magnitude of a few femtoseconds.

Description

Technical field [0001] The invention patent belongs to the field of ultrafast diagnosis, and specifically relates to a sub-femtosecond time-resolved fringe camera driven by terahertz. Background technique [0002] The generation of ultrafast electrons, the manipulation of trajectories, and the characterization of their time characteristics are the key technologies in the field of ultrafast research, and are generally closely related to ultrafast laser technology. [0003] At present, ultrafast optical pulses can reach the order of sub-100fs or even as, and the corresponding ultrafast electronic pulses can also be compressed to the order of hundreds of fs or even several fs. However, the measurement of electronic pulses with this time accuracy is still Faced with challenges. Especially in experiments such as the seed source of X-ray free electron laser, ultrafast electron diffraction and the second scattering of electrons in atoms, a comprehensive understanding of the time characte...

Claims

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Application Information

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IPC IPC(8): G04F13/02G04F13/00
CPCG04F13/00G04F13/026
Inventor 惠丹丹田进寿罗端温文龙王兴
Owner XI'AN INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
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