Explanipedia

EUV and Soft X-ray Spectroscopy of Highly Charged Heavy Ions Using LHD: Research Ranging from Industrial Light Sources to Basic Atomic Physics Open

C. Suzuki, Fumihiro Koike, I. Murakami, Daiji Kato, N. Tamura , et al. · 2025

This article reviews various achievements in spectroscopy of highly charged ions of a variety of heavy elements injected into the Large Helical Device (LHD) plasmas. We focus on discrete and quasi-continuum spectra observed in extreme ultr…

Shadowless amyloid imaging with quantitative birefringence contrast Open

Toshitaka Wakayama, Shun Yokouchi, Hidekazu Kayano, Takeshi Higashiguchi · 2025

EUV Spectra from Laser-Produced Tungsten Plasmas Open

Hayato Ohashi, Hiromu Kawasaki, Yuta Shimada, Shinichi Namba, G. O’Sullivan , et al. · 2025

EUV Emission from a Regenerative Liquid Target Laser-Produced Plasma Open

Tatsuya Soramoto, Takeru Niinuma, Hiroki Morita, Shinichi Namba, Takeshi Higashiguchi · 2025

Improvement of EUV Spectra by Optical Thickness Control Open

Tsukasa Sugiura, Masaki Kume, Hiroki Morita, Shinichi Namba, Takeshi Higashiguchi · 2025

Water-Window Soft X-Ray Spectra from Dual Laser-Produced Bi Plasmas Open

Tomoyoshi Toida, Tsukasa Sugiura, H. Yazawa, Hiroki Morita, Shinichi Namba , et al. · 2025

Skyrmion engineering with origami Open

Toshitaka Wakayama, Kohei Aizawa, Yudai Higuchi, Takeshi Higashiguchi · 2024

Skyrmion structures play critical roles in solid-state systems involving electric, magnetic and optical fields. Previous approaches to the study of skyrmions have involved specific structures in magnetic materials, liquid crystals and poly…

Efficient extreme ultraviolet emission by multiple laser pulses Open

Tsukasa Sugiura, H. Yazawa, Hiroki Morita, Kazuyuki Sakaue, D. Nakamura , et al. · 2024

We demonstrated an efficient extreme ultraviolet (EUV) source at a wavelength of 13.5 nm using spatially separated multiple solid-state-laser pulse irradiation. The maximum conversion efficiency (CE) achieved was 3.8% for ±30° oblique lase…

Development of Short Pulse CO<sub>2</sub> Laser and Related Extreme Ultraviolet (EUV) Source Open

Takeshi Higashiguchi · 2024

Simultaneous detection of polarization states and wavefront by an angular variant micro-retarder-lens array Open

Toshitaka Wakayama, Akane Zama, Yudai Higuchi, Y. Takahashi, Kohei Aizawa , et al. · 2023

We have demonstrated simultaneous detection of the polarization states and wavefront of light using a 7 × 7 array of angular variant micro-retarder-lenses. Manipulating the angular variant polarization with our optical element allows us to…

Optimization of extreme ultra-violet light emitted from the CO<sub>2</sub> laser-irradiated tin plasmas using 2D radiation hydrodynamic simulations Open

Atsushi Sunahara, A. Hassanein, Kentaro Tomita, Shinichi Namba, Takeshi Higashiguchi · 2023

We studied Extreme Ultra-Violet (EUV) emission characteristics of the 13.5 nm wavelength from CO 2 laser-irradiated pre-formed tin plasmas using 2D radiation hydrodynamic simulations. Our results indicate that when a CO 2 laser irradiates …

Thomson scattering measurements of electron temperature and electron density in laser-driven Gd plasmas Open

Yiming Pan, Atsushi Sunahara, Shinichi Namba, Takeshi Higashiguchi, Kentaro Tomita · 2023

In this study, we demonstrate the laser intensity scaling of electron temperature in Gd laser-produced plasmas (LPPs) through experiment and simulation. The spatial and temporal profiles of electron density n e and temperature T e in Gd LP…

Single fiber ghost imaging for extreme minimally invasive medicine Open

Toshitaka Wakayama, Yudai Higuchi, Rikuto Kondo, Yasuhiro Mizutani, Takeshi Higashiguchi · 2023

Optical scattering media, such as blood, disturbs us to diagnose diseases inside deep blood vessels of our body. This is one of age-old problems on optics. To date, optical correlation allows us to image any objects hidden by scattering me…

Generation of Highly Charged Au Ion in Laser-Produced Plasma for Water Window X-ray Radiation Sources Open

Jiahao Wang, Maki Kishimoto, T. Johzaki, Kairi Mizushima, Chihiro Kumeda , et al. · 2022

Highly charged ions in the plasma produced by high-power laser can radiate bright and short-pulse X-rays. Owing to the unresolved transition array (UTA) from the high-Z elements, laser produced plasma has been applied for developing X-ray …

Enhancement of Gain Coefficient of Li-Like Ion 3d-4f Soft X-ray Laser Oscillation by a Single Resonator Open

Shinichi Namba, Jiahao Wang, Hikari Ohiro, Jiawei Zhang, Maki Kishimoto , et al. · 2022

A recombination plasma soft X-ray laser that is associated with Li-like Aluminum ion Al10+ 3d-4f transition (wavelength: 15.47 nm) was investigated to increase the gain coefficient. By optimizing the time interval of the 16-pulse train, hi…

Independent contribution of optical attenuation length in ultrafast laser-induced structural change Open

Tatsunori Shibuya, Kazuyuki Sakaue, Hiroshi Ogawa, Daisuke Satoh, Thanh-Hung Dinh , et al. · 2021

Although laser irradiation with femtosecond pulses is known to generate crystallization and morphological changes, the contribution of optical parameters to material changes is still in discussion. Here, we compare two structures irradiate…

Silicon twisted cone structure produced by optical vortex pulse with structure evaluation by radiation hydrodynamic simulation Open

Daisuke Nakamura, Ryohei Tasaki, Miki Kawamoto, Hiroki Oshima, Mitsuhiro Higashihata , et al. · 2020

Electron temperature and soft x-ray intensity scaling in laser heavy element plasma interaction Open

Hiromu Kawasaki, Atsushi Sunahara, Yuta Shimada, Takeo Ejima, Weihua Jiang , et al. · 2020

We achieved a relative optically thin state in laser-produced heavy element plasmas at determined electron temperatures, which has been predicted by power balance and collisional-radiative models. We also mapped the power-loss processes in…

Demonstration of stimulated emission depletion phenomenon in luminescence of solid-state scintillator excited by soft X-rays Open

Takeo Ejima, Toshitaka Wakayama, Natsumi Shinozaki, Misaki Shoji, Genta Hatayama , et al. · 2020

Although imaging techniques using soft X-rays (SXs) are being developed as the available photon flux increases because of the continuing development of synchrotron light sources, it will be necessary to downsize the pixel size of the SX ca…

Measurement of Inner Surface Profile by Laser: Mapping of Three-Dimensional Structure of Ear Canal Open

Takeshi Higashiguchi · 2020

We have mapped three-dimensional (3-D) structure to determine details of surface profiles of the ear canal. We have developed an optical scanner for inner surface profile measurement. The 3-D mapping of the ear canal between our method and…

Controlled strong excitation of silicon as a step towards processing materials at sub-nanometer precision Open

Thanh-Hung Dinh, Nikita Medvedev, Masahiko Ishino, Toshiyuki Kitamura, Noboru Hasegawa , et al. · 2019

Interaction of a solid material with focused, intense pulses of high-energy photons or other particles (such as electrons and ions) creates a strong electronic excitation state within an ultra-short time and on ultra-small spatial scales. …

Luminescence properties of scintillators in soft X-ray region Open

Takeo Ejima, Shunsuke Kurosawa, Akihiro Yamaji, Tadashi Hatano, Toshitaka Wakayama , et al. · 2019

Both the total luminescence yield (TLY) and the luminescence spectra of scintillators were measured to identify which scintillator exhibited high luminosity in the soft X-ray (SX) region from 300 eV to 1.3 keV. The TLY intensities and the …

Optimized highly charged ion production for strong soft x-ray sources obeying a quasi-Moseley’s law Open

Yuta Shimada, Hiromu Kawasaki, Kanon Watanabe, Hiroyuki Hara, Kyoya Anraku , et al. · 2019

The extension of the roadmap of shorter wavelength extreme ultraviolet and soft x-ray sources is a topic of considerable interest. We have studied the optimized emission from high power and/or high brightness sources based on unresolved tr…

Soft X-ray spectral analysis of laser produced molybdenum plasmas using the fundamental and second harmonics of a Nd:YAG laser Open

Ragava Lokasani, Hiromu Kawasaki, Yuta Shimada, Misaki Shoji, Kyoya Anraku , et al. · 2019

Our measurement of the soft X-ray emission of Mo plasmas produced by picosecond Nd:YAG lasers emitting on the fundamental (1064 nm, 150 ps) and second (532 nm, 130 ps) harmonics is presented. The contrast in intensity between spectral peak…

Intense water-window soft x-ray emission by spectral control using dual laser pulses Open

Goki Arai, Hiroyuki Hara, Tadashi Hatano, Takeo Ejima, Weihua Jiang , et al. · 2018

We demonstrate intense emission in the water-window soft x-ray spectral region by controlling the spectral behavior through changing the balance between emissivity and self-absorption in an expanding plasma. The number of photons obtained …

Development of laboratory-type soft X-ray microscope, CXRM, in Water-window using LPP light source Open

Takeo Ejima, Yuichi Ono, Keisuke Ito, Hiromu Kawasaki, Takeshi Higashiguchi , et al. · 2018

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Demonstration of a terahertz pure vector beam by tailoring geometric phase Open

Toshitaka Wakayama, Takeshi Higashiguchi, Kazuyuki Sakaue, Masakazu Washio, Yukitoshi Otani · 2018

We demonstrate the creation of a vector beam by tailoring geometric phase of left- and right- circularly polarized beams. Such a vector beam with a uniform phase has not been demonstrated before because a vortex phase remains in the beam. …

Luminosity Increase in Laser-Compton Scattering by Crab Crossing Open

Yuya Koshiba, T. Takahashi, Shougo Ota, Masakazu Washio, Kazuyuki Sakaue , et al. · 2018

Laser-Compton Scattering X-ray (LCS-X) sources have been expected as compact and powerful sources, beyond X-ray tubes. They will enable laboratories and companies, opening new X-ray science. It is well known that luminosity depends on the …

Enhancement of Laser-Compton X-ray by Crab Crossing Open

Yuya Koshiba, Takeshi Higashiguchi, Ryosuke Morita, Shogo Ota, Kazuyuki Sakaue , et al. · 2018

We are going to apply crab crossing of electrons and laser photons for the enhancement of laser-Compton X-ray flux. Crab crossing will enable quasi-head-on collision and increase the luminosity. Therefore, it could be combined with an opti…

Fabrication of Nb Mushroom Shaped Cavity for Evaluation of Multi-layer Thin-film Superconductor Open

Hiroki Oikawa, Kazuhiro Enami, H. Hayano, Takeshi Higashiguchi, Hitoshi Inoue · 2018

The accelerating gradient of the Nb superconducting RF cavity seems to reach the limit due to the RF critical magnetic field of the Nb material. To obtain more higher gradient, there has been proposed a method of increasing an RF critical …

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