Abstract
The highest extraction efficiency (9.4%) of a free electron laser (FEL) oscillator has been achieved at the midinfrared FEL facility of Kyoto University. Because of the interaction between the electron beam and FEL electromagnetic field, a maximum electron energy decrease of 16% was observed. The measured energy decrease was consistent with the measured FEL spectrum. An FEL micropulse energy of ∼100 μJ with the expected few-cycle pulse duration at a wavelength of 11 μm was observed. This result is an important milestone for the high-extraction-efficiency FEL oscillator and will contribute to the strong-field physics of atoms and molecules.
Highlights
The highest extraction efficiency (9.4%) of a free electron laser (FEL) oscillator has been achieved at the midinfrared FEL facility of Kyoto
The measured energy decrease was consistent with the measured FEL spectrum
An FEL micropulse energy of ∼100 μJ with the expected few-cycle pulse duration at a wavelength of 11 μm was observed. This result is an important milestone for the high-extraction-efficiency he demands on intense and ultrashort midinfrared (MIR: 3–20 μm) or longwave-infrared (LWIR: 8–15 μm) lasers with wide wavelength tunability are rapidly increasing
Summary
View the article online for updates and enhancements. This content was downloaded from IP address 130.54.130.234 on 13/10/2020 at 09:37. An FEL micropulse energy of ∼100 μJ with the expected few-cycle pulse duration at a wavelength of 11 μm was observed This result is an important milestone for the high-extraction-efficiency. In a previous research,8) high-extraction-efficiency lasing with an extraction efficiency of 5.5% was achieved at the MIR-FEL facility of Kyoto University, i.e. KU-FEL,9) driven by electron beams having a relatively low bunch charge (
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