Explanipedia

Fabrication, spectroscopic characteristics, and lasing performance of Nd,La:CaF<sub>2</sub> transparent ceramics Open

Kana Fujioka, Yuuki Matsumoto, Yuki Tamaru, Hidetsugu Yoshida, Jumpei Ogino , et al. · 2025

In this study, Nd,La:CaF 2 transparent ceramics were fabricated from powders synthesized in the liquid phase. The light scattering in the ceramics was significantly reduced because of the homogeneous doping of Nd 3+ and La 3+ ions, realizi…

Second harmonic generation of focused beams on the LFEX laser facility Open

Yasunobu Arikawa, Hu Zhanngui, Koji Tsubakimoto, Morace Alessio, Ryunosuke Takizawa , et al. · 2024

There is a strong demand for efficient second harmonic generation (SHG) in ultra-intense short-pulse lasers. This paper demonstrates the generation of an unconverted fundamental (1ω)+second harmonics (2ω) mixed laser on the LFEX laser syst…

Hot electron and ion spectra on blow-off plasma free target in GXII-LFEX direct fast ignition experiment Open

T. Ozaki, Y. Abe, Yasunobu Arikawa, Y. Sentoku, J. Kawanaka , et al. · 2023

Polystyrene deuteride shell targets with two holes were imploded by the Gekko XII laser and additionally heated by the LFEX laser in a direct fast ignition experiment. In general, when an ultra-intense laser is injected into a blow-off pla…

Simulation of optical radiation force distribution in interference patterns and necessary conditions for chiral structure formation on dielectrics Open

Yoshiki Nakata, Koji Tsubakimoto, Hiroyuki Shiraga, N. Miyanaga, Yuki Kosaka , et al. · 2022

Direct fast heating efficiency of a counter-imploded core plasma employing a laser for fast ignition experiments (LFEX) Open

Yoneyoshi Kitagawa, Yoshitaka Mori, Katsuhiro Ishii, Ryohei Hanayama, S. Okihara , et al. · 2022

Fast heating efficiency when a pre-imploded core is directly heated with an ultraintense laser (heating laser) was investigated. ‘Direct heating’ means that a heating laser hits a pre-imploded core without applying either a laser guiding c…

Cascaded energy transfer and enhanced near-infrared emission in visible-pumped Cr and Nd co-doped Yb:YAG Open

Kana Fujioka, Taro Murakami, Shinji Motokoshi, Takagimi Yanagitani, Hidetsugu Yoshida , et al. · 2022

Super-strong magnetic field-dominated ion beam dynamics in focusing plasma devices Open

A. Morace, Y. Abe, J. J. Honrubia, Natsumi Iwata, Yasunobu Arikawa , et al. · 2022

10-J, 100-Hz conduction-cooled active-mirror laser Open

Jumpei Ogino, Shigeki Tokita, Shotaro Kitajima, Hidetsugu Yoshida, Zhaoyang Li , et al. · 2022

High average power lasers with a high pulse energy are of considerable interest in various fields such as high-energy-density physics. Light-absorbing edge cladding is effective in suppressing parasitic oscillations in high-pulse-energy di…

Prospects for High Repetition Rate Ultrashort Pulsed Ultra-High Intensity Lasers −Development of High Repetition Rate and High Pulse Energy Laser− Open

Jumpei Ogino, Shigeki Tokita, Hidetsugu Yoshida, Keiko Matsumoto, Koji Tsubakimoto , et al. · 2022

Digital Transformation of Operation and Usage of Power Laser GEKKO-XII and Laser for Fast Ignition Experiment (LFEX) Open

Hiroyuki Oku, Keisuke Takahashi, Hideo Nagatomo, Mizuho Nagata, Yoshinori Kubota , et al. · 2022

Hot Electron and Ion Spectra in Axial and Transverse Laser Irradiation in the GXII-LFEX Direct Fast Ignition Experiment Open

Tetsuo Ozaki, Y. Abe, Yasunobu Arikawa, S. Okihara, E. Miura , et al. · 2021

An electron spectrometer was used to measure the electron and ion spectra in two different irradiations of implosion laser to the deuterated spherical shell targets at the direct fast ignition experiments on the Gekko-LFEX facility. In the…

Laser-Induced Transfer of Noble Metal Nanodots with Femtosecond Laser-Interference Processing Open

Yoshiki Nakata, Koji Tsubakimoto, N. Miyanaga, Aiko Narazaki, Tatsuya Shoji , et al. · 2021

Noble metal nanodots have been applied to plasmonic devices, catalysts, and highly sensitive detection in bioinstruments. We have been studying the fabrications of them through a laser-induced dot transfer (LIDT) technique, a type of laser…

Direct Heating of Counter Imploded Core Open

Yoneyoshi Kitagawa, Yasunobu Arikawa, E. Miura, Tetsuo Ozaki, Osamu Komeda , et al. · 2021

This study investigates the heating efficiency of the fast heating when the imploded core is directly illuminated with an ultraintense laser. Six counterbeams of the GEKKO XII (GXII) green laser at the Institute of Laser Engineering (ILE),…

Nanodot array deposition via single shot laser interference pattern using laser-induced forward transfer Open

Yoshiki Nakata, Eiki Hayashi, Koji Tsubakimoto, N. Miyanaga, Aiko Narazaki , et al. · 2020

Laser-induced forward transfer (LIFT) is a direct-writing technique capable of depositing a single dot smaller than the laser wavelength at small shot energy through the laser-induced dot transfer (LIDT) technique. To deposit a single nano…

Stable ultra-broadband gain spectrum with wide-angle non-collinear optical parametric amplification Open

Zhaoyang Li, Koji Tsubakimoto, Jumpei Ogino, Xiaoyang Guo, Shigeki Tokita , et al. · 2018

Comparing with the non-collinear optical parametric amplification (NOPA), the gain bandwidth could be significantly enhanced by the wide-angle NOPA (WNOPA), i.e., with a divergent signal (WNOPA-S) or pump (WNOPA-P). In a uniaxial crystal, …

Spatial asymmetry of optical parametric fluorescence with a divergent pump beam and potential applications Open

Zhaoyang Li, Koji Tsubakimoto, Hidetsugu Yoshida, Toshikazu Uesu, K. Tsuji , et al. · 2017

The spatial distribution of the optical parametric fluorescence generated in a negative uniaxial nonlinear crystal is asymmetric with respect to the pump when the pump beam has a slight divergence angle. The formation mechanism of this phe…

Erratum: “Partially deuterated potassium dihydrogen phosphate optimized for ultra-broadband optical parametric amplification” [J. Appl. Phys. <b>117</b>, 093103 (2015)] Open

Kana Fujioka, Yasushi Fujimoto, Koji Tsubakimoto, Junji Kawanaka, Ichiro Shoji , et al. · 2016

First Page

High-average-power green laser using Nd:YAG amplifier with stimulated Brillouin scattering phase-conjugate pulse-cleaning mirror Open

Koji Tsubakimoto, Hidetsugu Yoshida, N. Miyanaga · 2016

We present a high-average-power green laser based on second harmonic conversion of a laser diode-pumped master oscillator Nd:YAG power amplifier system. The power amplifier chain includes a stimulated Brillouin scattering (SBS) cell that w…

Conceptual design of sub-exa-watt system by using optical parametric chirped pulse amplification Open

Junji Kawanaka, Koji Tsubakimoto, Hidetsugu Yoshida, Kana Fujioka, Yasushi Fujimoto , et al. · 2016

A 50 PW ultrahigh-peak-power laser has been conceptually designed, which is based on optical parametric chirped pulse amplification (OPCPA). A 250 J DPSSL and a flash- lamp-pumped kJ laser are adopted as new repeatable pump source. The exi…

Development of Pulsed 1.5 kW Class Average-Output-Power Fiber Laser System Based on Yb-Doped Rod Photonic Crystal Fibers (PCFs) for Beam Combination Open

Hidetsugu Yoshida, Koji Tsubakimoto, H. Fujita, N. Miyanaga, Haik Chosrowjan , et al. · 2016

We have developed high-peak and high-average-power polarization-maintained Yb doped PCF (Photonic Crystal Fiber) rod-fiber laser system. When the main 85 μm-PCF rod amplifier was seeded with 40 W, maximum average output power of over 210 W…

Preface to Special Issue on High Stability and High Brightness Laser Using Beam Combining Technique Open

Koji Tsubakimoto · 2016

Development of Feedback Algorithm for Filled Aperture Coherent Beam Combining Technique with Phase Control Open

Takuichi Kinugasa, Koji Tsubakimoto, Y Iwami, Hidetsugu YOSHIDA, H. Fujita , et al. · 2015

Stable coherent beam combining is demonstrated with a high-precise phase control. We developed a feedback program based on new algorism for a filled-aperture coherent beam combining. Four beams were coherently combined by using the develop…

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