Formation of low time-bandwidth product, single-sided exponential optical pulses in free-electron laser oscillators

Autor:	A. M. MacLeod, H. A. Schwettman, C.W Rella, Todd I. Smith, D. Oepts, A.F.G. van der Meer, Guido Knippels, W. A. Gillespie, X. Yan
Rok vydání:	2000
Předmět:	Physics business.industry Free-electron laser Time constant Physics::Optics Pulse duration Laser law.invention Resonator Full width at half maximum Optics law Spectral width Physics::Accelerator Physics business Bandwidth-limited pulse
Zdroj:	Physical Review E, 62, 4216-4220
ISSN:	1095-3787 1063-651X
DOI:	10.1103/physreve.62.4216
Popis:	The detailed shape of picosecond optical pulses from a free-electron laser (FEL) oscillator has been studied for various cavity detunings. For large values of the cavity detuning the optical pulse develops an exponential leading edge, with a time constant proportional to the applied cavity detuning and the quality factor of the resonator. This behavior has been observed at two separate FELs that have completely different resonator layouts and electron beam characteristics, and using different methods of optical pulse length measurement. The optical pulses have a full width at half maximum time-bandwidth product Delta t(FWHM)Delta f(FWHM) of 0.2-0.3. The results presented here can be used to predict the optical pulse length and corresponding minimum spectral width that can be generated in a FEL pumped by short electron bunches. This is important for the design of new infrared free-electron laser user facilities, which need to make a balanced choice between short pulses for high temporal resolution and narrow bandwidth for linear and nonlinear spectroscopy.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7daa9a3549eb947de71d27cb1a70786e https://doi.org/10.1103/physreve.62.4216 Zobrazit plný text záznamu