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@unpublished{zen:ipac2021-frxa05,
author = {H. Zen and R. Hajima and H. Ohgaki},
title = {{Record High Extraction Efficiency of Free electron Laser Oscillator}},
booktitle = {Proc. IPAC'21},
language = {english},
intype = {presented at the},
series = {International Particle Accelerator Conference},
number = {12},
venue = {Campinas, SP, Brazil},
publisher = {JACoW Publishing, Geneva, Switzerland},
month = {08},
year = {2021},
note = {presented at IPAC'21 in Campinas, SP, Brazil, unpublished},
abstract = {{The highest extraction efficiency (9.4%) of a free electron laser (FEL) oscillator has been achieved at the mid-infrared 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 micro-pulse energy of approximately 100 micro-J with micro-pulse duration of 150 fs 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.}},
}