A Specially Designed Femtosecond Streak Image Tube With Temporal Resolution Of 50fs

H. Niu; V. P. Degtyareva; V. N. Platonov; A. M. Prokhorov; M. Ya. Schelev

doi:10.1117/12.969079

7 June 1989 A Specially Designed Femtosecond Streak Image Tube With Temporal Resolution Of 50fs

H. Niu, V. P. Degtyareva, V. N. Platonov, A. M. Prokhorov, M. Ya. Schelev

Proceedings Volume 1032, 18th Intl Congress on High Speed Photography and Photonics; (1989) https://doi.org/10.1117/12.969079
Event: 18th International Congress on High Speed Photography and Photonics, 1988, Xi'an, Shaanxi, China

Abstract

In our specially designed femtosecond streak image tube, the electron beam was focused by a cylindrical electron optical lens. In order to achieve temporal resolution of less than 50fs and large dynamic range, the electric field near the photocathode was 6-8kV/mm with a slit acceleration electrode. The temporal dispersion in our lens has been eliminated completely by optimization of the electron focusing lens. To compensate the temporal dispersion arising from photocathode to accelerating electrode, a compensation element and a half open aperture have been introduced, so that the total temporal dispersion of less than 50fs has been achieved. To overcome the influence of a strong fringe field of the deflector in dynamic mode on the total temporal dispersion and spatial resolution, a travelling wave deflector will be used. In addition, to minimize the space charge effects, the electron transit time in this specially designed electron optical lens was shortened to 840ps and the so called crossover in slit direction disappeared. The discrete space charge effects have been modeled by Monte Carlo method including photoelectron emission process and induced charge on the electrode. The calculations have shown that this tube can handle the current density of up to 20A/cm2 without deterioration of the temporal resolution.

Citation Download Citation

H. Niu, V. P. Degtyareva, V. N. Platonov, A. M. Prokhorov, and M. Ya. Schelev "A Specially Designed Femtosecond Streak Image Tube With Temporal Resolution Of 50fs", Proc. SPIE 1032, 18th Intl Congress on High Speed Photography and Photonics, (7 June 1989); https://doi.org/10.1117/12.969079

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