H. Tanaka

TL;DR: The concept, design and performance of Japan's compact free-electron laser (FEL) facilities, the SPring-8 Compact SASE Source test accelerator (SCSS) and SPring 8 Angstrom Compact free electron LAser (SACLA), and their applications in mainly atomic, molecular and optical science are reviewed in this paper.

TL;DR: By introducing 13th- and 15th-order harmonics into an undulator of SCSS (SPring-8 Compact SASE Source) test accelerator at RIKEN, these harmonic pulses were amplified by a factor of more than 102 with a high contrast ratio through the interaction between accelerated electron bunches and the harmonic pulses as mentioned in this paper.

TL;DR: In this article, the 13th harmonic of a Ti:sapphire (TiS) laser in the extreme ultraviolet region, which was efficiently generated with a loose focusing geometry, was injected as a seeding source to a 250-MeV free-electron-laser (FEL) amplifier.

TL;DR: In this article, the higher-order harmonic (HH) seeded FEL operation at the fundamental wavelength of 61.2 nm using a seeding source of a HH pulses from Ti:sapphire laser at the SPring-8 Compact SASE Source (SCSS) test accelerator was reported.

TL;DR: In this article, a seeded FEL radiation in the EUV region at 61.2 nm with the 13th high-order harmonic beam was demonstrated and the single-peak spectra with drastic enhancements of intensity by nearly three-orders of magnitude.