Abstract
Single mode operation was exhibited on the Israeli tandem free-electron laser (FEL). This enabled judicious measurements of narrow spectral linewidth, frequency chirp, and relaxation-oscillation effects. Exact 3D simulations of the FEL oscillator showed good agreement with the measurements, and permitted an estimation of the fundamental Schawlow-Towns linewidth limit of the FEL (including `` $\ensuremath{\alpha}$ effect'') as well as technical noise linewidth limits. We estimate that with voltage-controlled stabilization high-power (10 kW) tunable (over $60%$ bandwidth) quasi-cw coherent $[(\ensuremath{\Delta}\ensuremath{\nu}/\ensuremath{\nu}{)}_{\mathrm{rms}}\ensuremath{\approx}{10}^{\ensuremath{-}10}]\mathrm{mm}$-FIR (far infrared) radiation is attainable in the tandem FEL.
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