Sub-MHz Linewidth at 240 GHz from an Injection-Locked Free-Electron Laser

Details Sub-MHz Linewidth at 240 GHz from an Injection-Locked Free-Electron Laser Sub-MHz Linewidth at 240 GHz from an Injection-Locked Free-Electron Laser

2007-06-08

arxiv.org/abs/0706.1116v1

Physics

Condensed Matter

Other Condensed Matter

3 pages including 3 figures

Scientific paper

10.1063/1.2801700

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.

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