The experiments of ultra-wide-band electromagnetic radiation from Photoconductive Semiconductor Switches
(PCSS's) triggered by high repeating frequency YAG ps laser pulse are reported. Based on the experimental results of
GaAs PCSS's and InP PCSS's in the linear mode, it is indicated that the rise time of ultra-fast electric pulse generated by
PCSS's depends on the rise time and the width of the triggering laser pulse. The fall time of the electric pulse is mainly
effected by the lifetime of the carriers. By analyzing the relationship between the time-domain characteristic and the
frequency-domain characteristic of the ultra-fast electric pulse generated by PCSS's, it is found that the frequency band
of electromagnetic radiation is mainly determined by the rise time and the fall time of the ultra-fast electric pulse. The
high-frequency component of frequency spectrum of electromagnetic radiation is determined by the rise time of electric
pulse, and the low-frequency component is determined by the fall time. The ultra-fast electric pulse whose rise time is
less than 100ps is obtained from GaAs PCSS's, and the ultra-fast electric pulse whose rise time is about 200ps is
obtained from InP PCSS's.
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