関西光科学研究所　|　【web開催】第81回KPSIセミナー 物性応用を目指した高強度極短パルスレーザーの開発

関西光科学研究所 >> KPSIセミナー >> 物性応用を目指した高強度極短パルスレーザーの開発

セミナー

第81回KPSIセミナー（web開催）

物性応用を目指した高強度極短パルスレーザーの開発

Since the first demonstration of attosecond EUV pulse generation in 2001, attosecond science has made significant progress. In the first decade, attosecond science aimed to demonstrate proof-of-principle experiments to establish novel concepts and technique. However, its capability was limited in EUV and gas-phase targets. Such limitations were originated from Ti:sapphire laser-based technologies that indeed supported the attosecond science in its early stage. Meanwhile, recent progress of attosecond science, especially soft-X-ray high harmonic generation and high harmonic generation in solids, are supported by optical parametric amplifiers (OPAs) or optical parametric chirped pulse amplifiers (OPCPAs) that can generate carrier-envelope phase (CEP)-stable intense pulses in the IR and MIR regions. Compared with conventional high-peak-power lasers such as Ti:sapphire chirped pulse amplifiers, the OPAs (or OPCPAs) allow us to design gain wavelength and bandwidth. The high single-pass gain is also possible, which is suited for CEP preservation during the amplification process. Negligible thermal load is advantageous to realize few-cycle intense light sources with high repetition rates when pumped by high-average-power solid state lasers. All these features are crucial to transform attosecond science to practical optical tools for materials science.

In my talk, I will overview our R&D activities on the OPA/OPCPA-based IR and MIR sources [1-4] and their applications to attosecond soft-X-ray spectroscopy [5, 6] and high harmonic generation in solids [6, 7]. I will also introduce our recent efforts in the MEXT Q-LEAP project that aims to lead materials science by combining intense ultrashort-pulse laser technology with state-of-the-art measurement technology.

References
[1] N. Ishii, K. Kaneshima, K. Kitano, T. Kanai, S. Watanabe, and J. Itatani, "Sub-two-cycle, carrier-envelope phase-stable, intense optical pulses at 1.6 μm from a BiB3O6 optical parametric chirped pulse amplifier," Opt. Lett. 37, 4182 (2012).
[2] K. Kaneshima, N. Ishii, K. Takeuchi, and J. Itatani, "Generation of carrier-envelope phase-stable mid-infrared pulses via dual-wavelength optical parametric amplification," Opt. Express 24, 8660 (2016).
[3] F. Lu, P. Xia, Y. Matsumoto, T. Kanai, N. Ishii, and J. Itatani, "Generation of sub-two-cycle CEP-stable optical pulses at 3.5 μm from a KTA-based optical parametric amplifier with multiple-plate compression," Opt. Lett. 43, 2720 (2018).
[4] N. Ishii, P. Xia, T. Kanai, and J. Itatani, "Optical parametric amplification of carrier-envelope phase-stabilized mid-infrared pulses generated by intra-pulse difference frequency generation," Optics Express 27, 11447 (2019).
[5] N. Ishii, K. Kaneshima, K. Kitano, T. Kanai, S. Watanabe, and J. Itatani, "Carrier-envelope phase-dependent high harmonic generation in the water window using few-cycle infrared pulses," Nature Commun. 5:3331 (2014).
[6] N. Saito, H. Sannohe, N. Ishii, T. Kanai, N. Kosugi, Y. Wu, A. Chew, S. Han, Z. Chang, and J. Itatani, "Real-time observation of electronic, vibrational, and rotational dynamics in nitric oxide with attosecond soft x-ray pulses at 400 eV," Optica 6, 1542 (2019).
[7] K. Kaneshima, Y. Shinohara, K. Takeuchi, N. Ishii, K. Imasaka, T. Kaji, S. Ashihara, K. L. Ishikawa, and J. Itatani,"Polarization-Resolved Study of High Harmonics from Bulk Semiconductors," Phys. Rev. Lett. 120, 243904 (2018).
[8] N. Saito, P. Xia, F. Lu, T. Kanai, J. Itatani, and N. Ishii, "Observation of selection rules for circularly polarized fields in high-harmonic generation from a crystalline solid," Optica 4, 1333 (2017).

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