OPERATION OF NEAR-INFRARED FEL AT NIHON UNIVERSITY*
OPERATION OF NEAR-INFRARED FEL AT NIHON UNIVERSITY*
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日本大学近红外 FEL 的运行*
DOI：
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发表时间：
2007
期刊：
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通讯作者：
I. Sato
中科院分区：
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作者：
K. Hayakawa;Y. Hayakawa;K. Nakao;K. Nogami;Toshinari Tanaka;S. Fukuda;Kazuro Furukawa;S. Michizono;S. Ohsawa;T. Kuwada;T. Sakai;I. Sato
自2003年以来，日本大学电子束研究与应用实验室（LEBRA）的近红外自由电子激光已被用于各种科学应用。125 MeV电子直线加速器的稳定性提高，使自由电子激光电源的稳定性得到明显改善。目前自由电子激光的基本波长在1 ~ 6 μ m之间，这受到电子能量和光学器件的限制。可见光区的高次谐波也是可用的[1]。在波长为1725 nm处获得了60 mJ/脉冲的最大宏脉冲输出能量。LEBRA的短自由电子激光谐振腔长度导致谐振腔反射镜表面上相对较高的光能密度; LEBRA使用的现有铜基Ag反射镜对于长期操作而言不够耐用。利用非线性晶体产生高次谐波的实验已经完成。初步结果表明，在1400 ~ 1800 nm波长范围内，基频自由电子激光的二次谐波转换效率为3 ~ 9%。
The near-infrared FEL at Laboratory for Electron Beam Research and Application (LEBRA) in Nihon University has been operated for a variety of scientific applications since 2003. The stability of the FEL power was improved appreciably by the advanced stability of the 125MeV electron linac. Currently fundamental FEL wavelength ranges from 1 to 6 microns, which is restricted by the electron energy and the optical devices. The higher harmonics in the visible region is also available [1]. The maximum macropulse output energy of 60mJ/pulse has been obtained at a wavelength of 1725 nm. The short FEL resonator length at LEBRA results in relatively high optical energy density on the surface of the resonator mirrors; present copper-based Ag mirrors in use at LEBRA are not durable enough for long-term operation. Generation of intense harmonics by means of nonlinear crystals has been tested. The preliminary results have demonstrated the conversion efficiencies of 3 to 9% for the second harmonic generation by the fundamental FEL in the wavelength region from 1400 to 1800nm.
K.Ishiwata.：Nucl.Med.Biol。
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