Characterization of a Rydberg atom-based streak camera operating in synchroscan mode

A streak camera that operates in synchroscan mode has been developed with a spectral response throughout the infrared. A gas-phase sample of Rydberg a toms is used as a photocathode. This compact device possesses 5 ps time res olution and can be used with a total infrared energy of about 1 nJ, or 10(- 7) of the total macropulse energy of the FELIX free electron laser. This co mbination of characteristics makes it not only an attractive device for use in a variety of infrared experiments, but also a powerful tool fur the stu dy of photo-induced electron emission in atomic systems. As an example, a R ydberg-atom based electron gun which produces about 20 pulses of electrons at a 70 GHz repetition frequency has been characterized using this synchros can streak camera. (C) 2000 Published by Elsevier Science B.V. All rights r eserved.