High spectral coherence in long-pulse and continuous free-electron laser: Measurements and theoretical limitations

A. Abramovich, M. Canter, A. Gover, J. Sokolowski, Y. M. Yakover, I. Schnitzer, J. Shiloh

Research output: Contribution to journalArticlepeer-review

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 “α 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 [/(Δv/v_)rms˜10−10] mm-FIR (far infrared) radiation is attainable in the tandem FEL.

Original languageEnglish
Pages (from-to)5257-5260
Number of pages4
JournalPhysical Review Letters
Volume82
Issue number26
DOIs
StatePublished - 1999

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