Abstract
In this paper, the positive and negative symmetric pulses with a fast rising edge were generated by a GaAs photoconductive semiconductor switch (PCSS). When the GaAs PCSS was biased at 2.0 kV and triggered by a femtosecond laser pulse with a pulse energy of 97.5 J, the peak voltages of the positive and negative pulses were 1.313 kV and 1.329 kV, respectively, and the rise times were 174 ps and 164 ps, respectively. Moreover, the GaAs PCSS presents good stability. The experimental results show that GaAs PCSSs can meet the requirement of a femtosecond streak camera.
Highlights
GaAs photoconductive semiconductor switches (PCSSs) have many advantages, including fast response times, high repetition rates, simple mechanical structure and low jitter [1,2,3,4]
When femtosecond laser pulses are focused on the gap of GaAs PCSSs, photo-excited carries are generated at the semiconductor’s conduction band, and are subsequently accelerated by a bias electrical field, and terahertz waves are radiated at the same time [8,9,10]
A sweep circuit was designed, in which a GaAs PCSS was used as an ultrafast pulse generator, positive and negative symmetric pulses output was realized, and the performance was tested
Summary
GaAs photoconductive semiconductor switches (PCSSs) have many advantages, including fast response times, high repetition rates (in the order of GHz), simple mechanical structure and low jitter [1,2,3,4]. When femtosecond laser pulses are focused on the gap of GaAs PCSSs, photo-excited carries are generated at the semiconductor’s conduction band, and are subsequently accelerated by a bias electrical field, and terahertz waves are radiated at the same time [8,9,10]. The slope of sweep voltage decides the sweep speed of stripe tube, dictating the stripe tube’s temporal resolution. The stripe tube’s temporal resolution in integral mode rests with the jitter time of the sweep circuit. A sweep circuit was designed, in which a GaAs PCSS was used as an ultrafast pulse generator, positive and negative symmetric pulses output was realized, and the performance was tested. The device can be applied in femtosecond streak cameras, and the scanning speed and temporal resolution can be expected to be improved
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
