Cavity dumping of an injection-locked free-electron laser

TL;DR

This paper demonstrates cavity dumping in an injection-locked free-electron laser at 240 GHz, significantly increasing power and enabling its use in pulsed electron spin resonance experiments.

Contribution

It introduces a novel cavity dumping technique for an injection-locked FEL, achieving an eightfold power increase and pulse cutoff, advancing high-frequency FEL applications.

Findings

Power output increased by a factor of ~8.

Cavity dumping enables abrupt pulse termination.

Successful application in pulsed ESR experiments.

Abstract

This letter reports cavity dumping of an electrostatic-accelerator-driven free-electron laser (FEL) while it is injection-locked to a frequency-stabilized 240 GHz solid-state source. Cavity dumping enhances the FEL output power by a factor of $\sim$8, and abruptly cuts off the end of the FEL pulse. The cavity-dumped, injection-locked FEL output is used in a 240 GHz pulsed electron spin resonance (ESR) experiment.