Theoretical And Experimental Study Of Femtosecond Streak Image Tube

H. Niu; H. Zhang; Q. L. Yang; Y. P. Liu; Y. C. Wang; Y. A. Reng; J. L. Zhou

doi:10.1117/12.969148

7 June 1989 Theoretical And Experimental Study Of Femtosecond Streak Image Tube

H. Niu, H. Zhang, Q. L. Yang, Y. P. Liu, Y. C. Wang, Y. A. Reng, J. L. Zhou

Proceedings Volume 1032, 18th Intl Congress on High Speed Photography and Photonics; (1989) https://doi.org/10.1117/12.969148
Event: 18th International Congress on High Speed Photography and Photonics, 1988, Xi'an, Shaanxi, China

Abstract

On the basis of thoroughly theoretical analysis of physical processes inside the femtosecond streak image tube, we have developed a new streak image tube with temporal resolution of about 100fs. In order to reduce the initial energy spread of photoelectrons therefore to improve the temporal resolution and variance of temporal resolution and to refine the time response of the photocathode, a special thin photocathode with work function of 2ev has been introduced. In this tube an axial symmetrical electrostatic focusing system with short photocathode-to-anode distance and relative low anode voltage has been used. By optimization of its structure and voltages applied to its electrodes, its temporal dispersion depends only on the electric field near the photocathode which has reached up to 5-10kV/mm. By this design the space charge effects have been alleviated. To reduce the effect of fringe field of the deflector on the temporal dispersion and dynamic spatial resolution, to improve the sensitivity of deflection and band width a symmetrical meander type travelling wave deflector has been designed with the aid of computer and successfully used. The experimental results have shown that its sensitivity of deflection and band width are 10am/kV and better than 2.5GHz respectively. During manufacturing this tube a very efficient phosphor screen has been utilized therefore the dynamic current density of this tube can be reduced and the discrete space charge effects can be further improved. The temporal resolution of this tube obtained by the experiment under current conditions have reached better than 300fs which is in agreement with the data predicted by calculation with computer.

Citation Download Citation

H. Niu, H. Zhang, Q. L. Yang, Y. P. Liu, Y. C. Wang, Y. A. Reng, and J. L. Zhou "Theoretical And Experimental Study Of Femtosecond Streak Image Tube", Proc. SPIE 1032, 18th Intl Congress on High Speed Photography and Photonics, (7 June 1989); https://doi.org/10.1117/12.969148

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