AI Article Synopsis
- The study focuses on the shape of picosecond optical pulses generated by free-electron laser (FEL) oscillators, specifically how varying cavity detuning affects their characteristics.
- For significant cavity detuning, the leading edge of the optical pulse exhibits an exponential form, influenced by both the cavity's detuning and its quality factor.
- These findings are crucial for designing new infrared FEL facilities, as they help balance the need for short pulse durations with narrow spectral bandwidth essential for various spectroscopy techniques.
Article Abstract
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 Deltat(FWHM)Deltaf(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.
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| http://dx.doi.org/10.1103/physreve.62.4216 | DOI Listing |
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