Transient Bandwidth Analysis of Photoconductive Microwave Switches Implemented in the OMEGA Pulse-Shaping System
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چکیده
LLE Review, Volume 76 225 The OMEGA laser fusion program at LLE calls for complex, temporally shaped optical pulses incident on fusion targets.1 The pulse-duration and rise-time specifications of these optical pulses dictate an electrical pulse–shaping system bandwidth of approximately 0.1 to 10 GHz. The optical pulses are created by imprinting an electrical equivalent of the desired optical envelope onto an optical square pulse, using an integrated-optics Mach–Zehnder interferometric electro-optic modulator as shown in Fig. 76.20. The electrical pulse shape is generated by the reflection of an electrical square pulse from a distributed variable-impedance microstrip transmission line. The electrical square pulse is generated by illuminating a photoconductive semiconducting (PCS) switch in a series–gap configuration, which discharges a microstrip transmission line charged with a dc voltage. Assuming the PCS switch is saturated by the illumination, the rise time of the electrical pulse corresponds to the rise time of the optical illumination trigger Transient Bandwidth Analysis of Photoconductive Microwave Switches Implemented in the OMEGA Pulse-Shaping System
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