High harmonic generation towards 1-keV photon energies and their applications to attosecond soft-X-ray spectroscopy

2015 Fiscal Year Final Research Report

• Project/Area Number: 23226003
• Research Category: Grant-in-Aid for Scientific Research (S)
• Allocation Type: Single-year Grants
• Research Field: Applied optics/Quantum optical engineering
• Research Institution: The University of Tokyo
• Principal Investigator: Itatani Jiro 東京大学, 物性研究所, 准教授 (50321724)
• Co-Investigator(Renkei-kenkyūsha): KANAI Teruto 東京大学, 物性研究所, 技術専門職員 (10575161) ; ISHII Nobuhisa 東京大学, 物性研究所, 助教 (40586898) ; KITANO Kenta 東京大学, 物性研究所, 特任研究員 (90586900)
• Research Collaborator: GEISELER Jost Henning ; KANESHIMA Keisuke ; MATSUMOTO Yoshiyuki ; SHAO Tianjiao ; GEIER Florian ; PUPEIKIS Justinas ; SAITO Nariyuki
• Project Period (FY): 2011-04-01 – 2016-03-31
• Keywords: アト秒科学 / 光源技術 / 光・量子ビーム / 超高速分光 / 軟X線分光 / 超精密計測 / 非線形光学 / 赤外材料・素子

Outline of Final Research Achievements

We have developed a novel BIBO-based optical parametric chirped pulse amplifier (OPCPA) system for producing intense ultrashort infrared pulses. We obtained record-breaking 1.5-mJ, 11-fs pulses at 1600 nm at a repetition rate of 1 kHz, which was best suited for the generation of attosecond soft-X-ray pulses. We observed a carrier-envelope phase-dependent behavior in the spectra of soft-X-ray harmonics, which supported the generation of single isolated attosecond pulses in 250-325 eV. We also carried out the soft-X-ray absorption spectroscopy of carbon material at the carbon K edge. We successfully identified the peak structures that originated from chemical bonding of carbon atoms. This result is an important step to realize ultrafast soft-X-ray absorption spectroscopy on attosecond time scales.

Free Research Field

アト秒科学