2 research outputs found
Cavity dumping of an injection-locked free-electron laser
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 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.Comment: 8 pages including 3 figure
Sub-MHz Linewidth at 240 GHz from an Injection-Locked Free-Electron Laser
Radiation from an ultra-stable 240 GHz solid-state source has been injected,
through an isolator, into the cavity of the University of California Santa
Barbara (UCSB) MM-wave free-electron laser (FEL). High-power FEL emission,
normally distributed among many of the cavity's longitudinal modes, is
concentrated into the single mode to which the solid state source has been
tuned. The linewidth of the FEL emission is 0.5 MHz, consistent with the
Fourier transform limit for the 2 microsecond pulses. This demonstration of
frequency-stable, ultra-narrow-band FEL emission is a critical milestone on the
road to FEL-based pulsed electron paramagnetic resonance spectroscopy.Comment: 3 pages including 3 figure