Test of KW Class Photonic Microwave Generation Using Vanadium-Compensated 6H-SiC PCSS and Burst-Mode-Operation Pulse Laser

Abstract

Photoconductive semiconductors operating in linear mode can be used for adaptive high-power microwave (HPM) generators by modulating incident light. This paper presents the design scheme and preliminary test results of a narrowband kW class adaptive photonic microwave generator by employing a widebandgap semi-insulating 6H-SiC photoconductive semiconductor and a burst-mode laser. The experimental scheme of the generator is described along with the circuit simulation of the radio frequency generator. The laser operated at a wavelength of 532 nm with a pulse width of 100 ns and a repetition rate of 100 Hz. The laser modulates the frequencies of the generated microwave, and preliminary tests are conducted in the frequency range of 0.8-1.2 GHz. The maximum output microwave power of the designed scheme reaches up to 2.6 kW when the bias voltage is 10 kV. The results confirm that this method can be used for high-power frequency-adjustable microwave signal generation. The microwave source system presented in this paper has continuously adjustable frequency and flexible waveform control.

Recent progress of parameter-adjustable high-power photonic microwave generation based on wide-bandgap photoconductive semiconductors

“…The ultimate purpose of designing an optical coupling structure is to make the PCSDs utilize as much light energy as possible, that is, to achieve efficient photoelectric conversion, which mainly has two indicators [63][64][65] . One is the gain of the light energy.…”

Fiber-Induced Optical Reflective Cavity in a High-Voltage SiC Photoconductive Switch to Improve Photoelectric Responsivity

“…Operating in linear operation mode, the vanadium-doped SiC PCSS exhibits light-controlled resistance with a short recombination lifetime (~100 ps). It can be used to generate high-power frequency-agile RF/microwave illuminated by an adjustable high-frequency (GHz) burst-mode laser [14][15][16][17][18]. SiC PCSS are mainly lateral or vertical structures, the diagram of which is shown in Fig.…”