Optical phase locking of a 2.86-GHz harmonically mode-locked free-electron laser

Journal Article · Mon Jul 01 04:00:00 EDT 1996 · Journal of the Optical Society of America, Part B: Optical Physics

DOI:https://doi.org/10.1364/JOSAB.13.001588· OSTI ID:286561

Szarmes, E B ^[1]; Madden, A D ^[2]; Madey, J M ^[1]

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1. Department of Physics, Duke University, Durham, North Carolina 27708-0319 (United States)
2. Department of Applied Science, University of California, Davis, Davis, California 95616 (United States)

We have phase locked the picosecond optical pulse train from the Mark III free-electron laser at the 2.86-GHz rf frequency, using a Michelson resonator to couple adjacent intracavity pulses, and have externally filtered a single axial mode from the optical spectrum at 3 {mu}m, using a solid {acute e}talon in series with a monochrometer. The interpulse phase coherence is manifest in the optical spectrum as a reduction in the number of axial modes per rf band and was confirmed with a spectrum analyzer capable of distinguishing adjacent modes. The high-power resonator employed a sapphire beam splitter of novel design and yielded a peak single-mode output power of 28 W and an average unfiltered macropulse power of 3 kW with a frequency stability appropriate for high-resolution spectroscopy. We demonstrate stable, interferometric tuning of the axial modes and also measure the detuning and desynchronism properties of the resonator to be in complete agreement with previous theoretical analyses. {copyright} {ital 1996 Optical Society of America.}

• OSTI ID: 286561
• Journal Information: Journal of the Optical Society of America, Part B: Optical Physics, Journal Name: Journal of the Optical Society of America, Part B: Optical Physics Journal Issue: 7 Vol. 13; ISSN JOBPDE; ISSN 0740-3224
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
FREE ELECTRON LASERS
MICHELSON INTERFEROMETER
MODE LOCKING
PHASE STABILITY
POWER RANGE 01-10 KW
POWER RANGE 10-100 W
PULSE TECHNIQUES
TUNING