1992
DOI: 10.1103/physrevlett.68.3543
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Induced and spontaneous interpulse phase locking in a free-electron laser

Abstract: We present the first experimental demonstration of phase locking between successive optical micropulses in a free-electron laser in which the electron pulses are separated by a fraction of the opticalcavity round-trip time. A Fox-Smith interferometer arrangement has been used to induce a high degree of interpulse phase coherence. Surprisingly, a substantial amount of coherence has also been observed without the phase-locking arrangement. A tentative explanation of this phenomenon is given. PACS numbers: 41.60.… Show more

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Cited by 29 publications
(11 citation statements)
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“…The feasibility of this procedure has been shown in Ref. [5]; we now present evidence that this selection approaches the single cavity-mode limit, and apply it to obtain nearly singlemode output. The coherence of the laser output is analyzed with a Michelson interferometer allowing a maximum path difference of 240 cm between the two beams.…”
Section: Selection Of Single-mode Radiation From a Short-pulse Free-ementioning
confidence: 55%
“…The feasibility of this procedure has been shown in Ref. [5]; we now present evidence that this selection approaches the single cavity-mode limit, and apply it to obtain nearly singlemode output. The coherence of the laser output is analyzed with a Michelson interferometer allowing a maximum path difference of 240 cm between the two beams.…”
Section: Selection Of Single-mode Radiation From a Short-pulse Free-ementioning
confidence: 55%
“…In the mm wavelength range an additional effect can be used to further reduce the bandwidth: the coherence effect between the successive laser pulses which yields a laser line composed of a series of narrow lines separated by the fundamental accelerator frequency (3 GHz in most cases). In certain conditions, a single line can be obtained [14] with a narrow bandwith of the order of 10 -4 . Due to these reasons and also to the success of the mid-infrared facilities, many FELs are now under development in FIR.…”
Section: Fel Coherencementioning
confidence: 99%
“…A few applications have been started. Interestingly, this laser has been a test bench for the physics of FIR pulsed FELs [14].…”
Section: Far-infrared Facilitiesmentioning
confidence: 99%
“…In this Letter, we describe a new technique for ultrasensitive absorption spectroscopy, and we report the results of a preliminary experiment to demonstrate an essential component of that technique, i.e., the observation of a cw dark-field signal in an absorption experiment in methane using a phase-locked free-electron laser (FEL) [6][7][8]. "FEL modulation spectroscopy" exploits the high power and wide tunability of the FEL and is inherently capable, in principle, of both single-mode spectral resolution and quantum-limited sensitivity.…”
mentioning
confidence: 99%