Dr. Tetsuya Kawachi Profile

Dr. Tetsuya Kawachi

Principal Researcher at QST

SPIE Involvement:

Author

Publications (31)

Proceedings Article | 8 June 2023 Poster + Paper

Poster + Paper

Instruments for best target position determination in the high-intensity laser-solid interaction experiment

Eugene Vishnyakov, Akito Sagisaka, Koichi Ogura, Tatiana Pikuz, Chris Armstrong, Sergey Pikuz, Bruno Gonzalez-Izquierdo, Timur Zh. Esirkepov, Wenchao Yan, Tae Moon Jeong, Sushil Singh, Prokopis Hadjisolomou, Ondrej Finke, Gabriele Maria Grittani, Michal Nevrkla, Carlo Maria Lazzarini, Andriy Velyhan, Takehito Hayakawa, Yuji Fukuda, James Koga, Masahiko Ishino, Kotaro Kondo, Yasuhiro Miyasaka, Akira Kon, Masaharu Nishikino, Yevhen Nosach, Danila Khiklukha, Ilya Tsygvintsev, Deepak Kumar, Jaroslav Nejdl, Daniele Margarone, Pavel Sasorov, Masaki Kando, Hiromitsu Kiriyama, Georg Korn, Kiminori Kondo, Sergei Bulanov, Tetsuya Kawachi, Alexander Pirozhkov

Proceedings Volume 12582, 125820E (2023) https://doi.org/10.1117/12.2665527

KEYWORDS: Diagnostics, Spectroscopy, X-rays, Extreme ultraviolet, Specular reflections, Spectrographs, Electrons, Scintillators

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Proceedings Article | 14 March 2018 Presentation

Presentation

Development of high-energy and high repetition rate compact pulse laser system for inspection of tunnel concrete (Conference Presentation)

Hajime Okada, Noboru Hasegawa, Katsuhiro Mikami, Toshiyuki Kitamura, Shuji Kondo, Masaharu Nishikino, Tetsuya Kawachi

Proceedings Volume 10511, 105110U (2018) https://doi.org/10.1117/12.2291157

KEYWORDS: Nd:YAG lasers, Pulsed laser operation, Oscillators, Laser systems engineering, Optical amplifiers, Crystals, Laser development, Thermal effects, Energy efficiency, Inspection

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SPIE Journal Paper | 9 February 2018 Open Access

Open Access

Demonstration of 25-Hz-inspection-speed laser remote sensing for internal concrete defects

Shinri Kurahashi, Katsuhiro Mikami, Toshiyuki Kitamura, Noboru Hasegawa, Hajime Okada, Shuji Kondo, Masaharu Nishikino, Tetsuya Kawachi, Yoshinori Shimada

JARS, Vol. 12, Issue 01, 015009, (February 2018) https://doi.org/10.1117/12.10.1117/1.JRS.12.015009

KEYWORDS: Inspection, Laser systems engineering, Lawrencium, Remote sensing, Laser development, Crystals, Laser crystals, Pulsed laser operation, Optical amplifiers, Mirrors

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Proceedings Article | 17 May 2017 Presentation + Paper

Presentation + Paper

Soft x-ray laser ablation of metals and dielectrics

A. Faenov, T. Pikuz, M. Ishino, N. Inogamov, V. Zhakhovsky, I. Skobelev, N. Hasegawa, M. Nishikino, M. Kando, R. Kodama, T. Kawachi

Proceedings Volume 10243, 102430S (2017) https://doi.org/10.1117/12.2264966

KEYWORDS: Foam, X-ray lasers, Laser ablation, Metals, Gold, Copper, Aluminum, Dielectrics, X-rays, Laser induced fluorescence, Picosecond phenomena

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Proceedings Article | 14 March 2017 Paper

Paper

Observation of fs-laser spallative ablation using soft X-ray laser probe

Masaharu Nishikino, Noboru Hasegawa, Takuro Tomita, Yasuo Minami, Takashi Eyama, Naoya Kakimoto, Rui Izutsu, Motoyoshi Baba, Tetsuya Kawachi, Tohru Suemoto

Proceedings Volume 10091, 100910O (2017) https://doi.org/10.1117/12.2255725

KEYWORDS: Laser ablation, Femtosecond phenomena, X-ray lasers, Laser processing, Interferometers, Reflectivity, Metals, X-rays, Gold, X-ray imaging, Picosecond phenomena, Mirrors

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Proceedings Article | 22 September 2015 Paper

Paper

Observation of dynamics and modification of solid surface using a picosecond soft x-ray laser

M. Nishikino, T. Kawachi, N. Hasegawa, M. Ishino, Y. Minami, T. Suemoto, N. Ohnishi, A. Ito, K. Sato, A. Faenov, N. Inogamov, M. Yamagiwa

Proceedings Volume 9589, 958902 (2015) https://doi.org/10.1117/12.2186363

KEYWORDS: Laser ablation, X-ray lasers, X-rays, Femtosecond phenomena, Picosecond phenomena, Plasma, X-ray imaging, Double sideband modulation, Laser processing, Mirrors

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Proceedings Article | 22 September 2015 Open Access

Open Access

Paper

The observation of a transient surface morphology in the femtosecond laser ablation process by using the soft x-ray laser probe (Withdrawal Notice)

Noboru Hasegawa, Masaharu Nishikino, Takuro Tomita, Naofumi Ohnishi, Atsushi Ito, Takashi Eyama, Naoya Kakimoto, Rui Idutsu, Yasuo Minami, Motoyoshi Baba, Anatoly Faenov, Nail Inogamov, Tetsuya Kawachi, Mitsuru Yamagiwa, Tohru Suemoto

Proceedings Volume 9589, 95890A (2015) https://doi.org/10.1117/12.2186744

KEYWORDS: Picosecond phenomena, Laser ablation, X-rays, Sapphire lasers, Imaging systems, X-ray lasers, Reflectivity, Surface roughness, X-ray imaging, Platinum

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Proceedings Article | 22 September 2015 Paper

Paper

Output beam polarisation of x-ray lasers with transient inversion

K. Janulewicz, C. M. Kim, H. Stiel, T. Kawachi, M. Nishikino, N. Hasegawa

Proceedings Volume 9589, 95890N (2015) https://doi.org/10.1117/12.2190178

KEYWORDS: Polarization, X-ray lasers, Amplifiers, Plasma, Oscillators, Plutonium, Beam splitters, Magnetism, Photonics, Silver

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Proceedings Article | 22 September 2015 Paper

Paper

Low electron temperature in ablating materials formed by picosecond soft x-ray laser pulses

Masahiko Ishino, Noboru Hasegawa, Masaharu Nishikino, Tatiana Pikuz, Igor Skobelev, Anatoly Faenov, Nail Inogamov, Tetsuya Kawachi, Mitsuru Yamagiwa

Proceedings Volume 9589, 958904 (2015) https://doi.org/10.1117/12.2186053

KEYWORDS: Picosecond phenomena, X-ray lasers, Laser ablation, Laser induced fluorescence, CMOS sensors, Cameras, Aluminum, Copper, Visible radiation, Plasma

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Proceedings Article | 5 August 2015 Open Access

Open Access

Paper

Damage-controlled high power lasers and plasma mirror application

Hiromitsu Kiriyama, Yoshihiro Ochi, Masaharu Nishikino, Keisuke Nagashima, Tetsuya Kawachi, Ryoji Itakura, Akira Sugiyama, Masaki Kando, A. Pirozhkov, Mamiko Nishiuchi, Sergei Bulanov, Kimonori Kondo, Yoshiaki Kato

Proceedings Volume 9532, 95320A (2015) https://doi.org/10.1117/12.2185763

KEYWORDS: Plasma, Laser systems engineering, Optical amplifiers, Mirrors, Pulsed laser operation, Terahertz radiation, Laser induced damage, X-ray lasers, High power lasers, Vacuum ultraviolet

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Proceedings Article | 27 September 2013 Paper

Paper

Nano-meter scale modifications on material surfaces induced by soft x-ray laser pulse irradiations

Masahiko Ishino, Anatoly Faenov, Momoko Tanaka, Satoshi Tamotsu, Tatiana Pikuz, Noboru Hasegawa, Masaharu Nishikino, Nail Inogamov, Igor Skobelev, Vladimir Fortov, Genri Norman, Sergey Starikov, Vladimir Stegailov, Takeshi Kaihori, Tetsuya Kawachi, Mitsuru Yamagiwa

Proceedings Volume 8849, 88490F (2013) https://doi.org/10.1117/12.2022425

KEYWORDS: Aluminum, Gold, Copper, Silicon, Zirconium, X-ray lasers, Scanning electron microscopy, Laser ablation, Silver, X-rays

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Proceedings Article | 27 September 2013 Paper

Paper

Observation of the nano-scale surface dynamics of femtosecond laser ablation by time-resolved soft x-ray imaging technique

M. Nishikino, N. Hasegawa, T. Tomita, Y. Minami, R. Takei, M. Baba, T. Eyama, S. Takayoshi, T. Kawachi, D. Hatomi, N. Ohnishi, M. Yamagiwa, T. Suemoto

Proceedings Volume 8849, 88490E (2013) https://doi.org/10.1117/12.2022834

KEYWORDS: Femtosecond phenomena, Laser ablation, Picosecond phenomena, X-rays, Platinum, X-ray imaging, Interferometers, Atomic force microscopy, X-ray lasers, Laser processing

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Proceedings Article | 27 September 2013 Paper

Paper

Development of an objective flat-field spectrograph for electron microscopic soft x-ray emission spectrometry in 50-4000 eV

T. Imazono, M. Koike, T. Kawachi, N. Hasegawa, M. Koeda, T. Nagano, H. Sasai, Y. Oue, Z. Yonezawa, S. Kuramoto, M. Terauchi, H. Takahashi, N. Handa, T. Murano

Proceedings Volume 8848, 884812 (2013) https://doi.org/10.1117/12.2024652

KEYWORDS: Diffraction gratings, Diffraction, Spectrographs, Multilayers, X-rays, Optical design, Energy efficiency, Holography, Gold, Spherical lenses

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Proceedings Article | 27 September 2013 Paper

Paper

Transmission imaging of sodium in the vacuum ultra-violet spectral range: new application for an intense VUV source

Hiroyuki Daido, Yoji Suzuki, Tetsuya Kawachi, Takeshi Fukuda, Toshio Nakagiri, Masanori Kaku, Shoichi Kubodera, Alexander Pirozhkov

Proceedings Volume 8849, 884908 (2013) https://doi.org/10.1117/12.2022938

KEYWORDS: Sodium, Vacuum ultraviolet, Magnesium fluoride, Transmittance, Lamps, Liquids, Ultraviolet radiation, Refractive index, Excimer lasers, Solids

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Proceedings Article | 11 December 2012 Paper

Paper

Using submicron-resolution LiF crystal and film x-ray detectors for the near and far fields in-situ characterization of soft x-ray laser beams

Tatiana Pikuz, Anatoly Faenov, Yuji Fukuda, Yoshiaki Kato, Tetsuya Kawachi, Masaki Kando

Proceedings Volume 8678, 86780B (2012) https://doi.org/10.1117/12.2003489

KEYWORDS: Laser induced fluorescence, Crystals, X-rays, Sensors, Laser crystals, Free electron lasers, X-ray imaging, Diffraction, Ions, Mirrors

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Proceedings Article | 6 October 2011 Paper

Paper

Signal build-up from noise and seeding in plasma-based x-ray lasers

Chul Min Kim, Karol Janulewicz, Holger Stiel, Masaharu Nishikino, Noboru Hasegawa, Tetsuya Kawachi, Jongmin Lee

Proceedings Volume 8140, 814008 (2011) https://doi.org/10.1117/12.893468

KEYWORDS: Polarization, X-ray lasers, Picosecond phenomena, Light sources, Amplifiers, Interference (communication), X-rays, Physics, Performance modeling, Wave propagation

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Proceedings Article | 5 October 2011 Paper

Paper

Observation of the laser-induced surface dynamics by the single-shot x-ray laser interferometer

Noboru Hasegawa, Yoshihiro Ochi, Tetsuya Kawachi, Masaharu Nishikino, Masahiko Ishino, Takashi Imazono, Takeshi Kaihori, Akira Sasaki, Kota Terakawa, Yasuo Minami, Takuro Tomita, Minoru Yamamoto, Yoshifumi Umeda, Mitsuru Yamagiwa, Tohru Suemoto

Proceedings Volume 8140, 81400G (2011) https://doi.org/10.1117/12.893442

KEYWORDS: Picosecond phenomena, Interferometers, X-ray lasers, Sapphire lasers, Mirrors, Laser ablation, Platinum, Beam splitters, X-rays, Streak cameras

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Proceedings Article | 28 September 2011 Paper

Paper

Diffraction efficiencies of holographic laminar and blazed types gratings for use in a flat-field spectrograph in the 50-200 eV range for transmission electron microscopes

T. Imazono, M. Koike, T. Kawachi, M. Koeda, T. Nagano, H. Sasai, Y. Oue, Z. Yonezawa, S. Kuramoto, K. Sano

Proceedings Volume 8139, 81390V (2011) https://doi.org/10.1117/12.893382

KEYWORDS: Diffraction gratings, Diffraction, Spectrographs, Lawrencium, Holography, X-rays, Optical design, Transmission electron microscopy, Energy efficiency, Wavefronts

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Proceedings Article | 28 September 2011 Paper

Paper

Development of a specimen holder combined with ultra thin film laser plasma x-ray source for compact contact-type soft x-ray microscope to observe hydrated living biological cells

Masahiko Ishino, Masataka Kado, Kunio Shinohara, Yoshimasa Yamamoto, Itaru Hirai, Maki Kishimoto, Masaharu Nishikino, Noboru Hasegawa, Satoshi Tamotsu, Keiko Yasuda, Tetsuya Kawachi

Proceedings Volume 8139, 81390R (2011) https://doi.org/10.1117/12.892864

KEYWORDS: X-rays, X-ray imaging, Microscopes, Gold, Plasma, Polymethylmethacrylate, Thin films, Pulsed laser operation, X-ray sources, Photons

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Proceedings Article | 28 February 2011 Paper

Paper

Ablation by short optical and x-ray laser pulses

N. Inogamov, S. Anisimov, V. Zhakhovsky, A. Ya. Faenov, Yu. V. Petrov, V. Khokhlov, V. Fortov, M. Agranat, S. Ashitkov, P. Komarov, I. Yu. Skobelev, Y. Kato, T. Pikuz, V. Shepelev, Y. Fukuda, M. Tanaka, M. Kishimoto, M. Ishino, M. Nishikino, M. Kando, T. Kawachi, M. Nagasono, H. Ohashi, M. Yabashi, K. Tono, Y. Senba, T. Togashi, T. Ishikawa

Proceedings Volume 7996, 79960T (2011) https://doi.org/10.1117/12.887429

KEYWORDS: Laser induced fluorescence, Crystals, Laser ablation, Aluminum, Laser crystals, Picosecond phenomena, Dielectrics, Tellurium, Ionization, Extreme ultraviolet

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Proceedings Article | 25 February 2010 Paper

Paper

Observations of the intense soft x-ray emissions from ultrathin Au films irradiated with high contrast laser pulses

Masahiko Ishino, Masataka Kado, Masaharu Nishikino, Kunio Shinohara, Satoshi Tamotsu, Keiko Yasuda, Noboru Hasegawa, Maki Kishimoto, Toshiyuki Ohba, Tetsuya Kawachi

Proceedings Volume 7589, 75891B (2010) https://doi.org/10.1117/12.839945

KEYWORDS: X-rays, Gold, Plasmas, Thin films, X-ray imaging, Pulsed laser operation, CCD cameras, Silicon, Spatial resolution, X-ray sources

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Proceedings Article | 29 September 2009 Paper

Paper

Source development and novel applications of x-ray lasers for probing materials

T. Kawachi, M. Kishimoto, M. Kado, Y. Ochi, N. Hasegawa, M. Tanaka, M. Nishikino, M. Ishino, T. Imazono, T. Ohba, T. Kaihori, M. Koike, K. Namikawa, T. Suemoto, K. Terakawa, T. Tomita, N. Sarukura, H. Nishimura, A. Faenov, S. Bulanov, H. Daido

Proceedings Volume 7451, 745107 (2009) https://doi.org/10.1117/12.825662

KEYWORDS: X-ray lasers, X-rays, Mirrors, Plasma, Crystals, Laser ablation, Interferometers, Laser induced fluorescence, Optical amplifiers, Laser crystals

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Proceedings Article | 7 May 2009 Paper

Paper

XUV and IR electromagnetic radiation from nonlinear laser-plasma interaction

Masaki Kando, Alexander Pirozhkov, Yuji Fukuda, Timur Esirkepov, Izuru Daito, Keigo Kawase, Jinglong Ma, Liming Chen, Yukio Hayashi, Michiaki Mori, Koichi Ogura, Hideyuki Kotaki, Akito Sagisaka, Evgeny Ragozin, Anatoly Faenov, Tatiana Pikuz, Hiromitsu Kiriyama, Hajime Okada, Takashi Kameshima, James Koga, Tetsuya Kawachi, Hiroyuki Daido, Toyoaki Kimura, Yoshiaki Kato, Toshiki Tajima, Sergei Bulanov

Proceedings Volume 7359, 73590K (2009) https://doi.org/10.1117/12.820463

KEYWORDS: Mirrors, Plasmas, Pulsed laser operation, Extreme ultraviolet, Signal detection, Polarization, Infrared radiation, Electromagnetic radiation, Solitons, Charge-coupled devices

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Proceedings Article | 14 September 2005 Paper

Paper

Recent progress in x-ray laser research in JAERI

T. Kawachi, K. Nagashima, M. Kishimoto, N. Hasegawa, M. Tanaka, Y. Ochi, M. Nishikino, H. Kawazome, R. Tai, K. Namikawa, Y. Kato

Proceedings Volume 5919, 59190L (2005) https://doi.org/10.1117/12.616417

KEYWORDS: X-ray lasers, X-rays, Amplifiers, Polarization, Picosecond phenomena, Neodymium glass lasers, Target detection, Mirrors, Plasma, Speckle

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Proceedings Article | 19 December 2003 Paper

Paper

Development of a full spatial coherent x-ray laser at 13.9 nm

Keisuke Nagashima, Momoko Tanaka, Masaharu Nishikino, Maki Kishimoto, Masataka Kado, Tetsuya Kawachi, Noboru Hasegawa, Yoshihiro Ochi, Kouta Sukegawa, Renzhong Tai, Yoshiaki Kato

Proceedings Volume 5197, (2003) https://doi.org/10.1117/12.503910

KEYWORDS: X-ray lasers, X-rays, Refraction, Picosecond phenomena, Spatial coherence, Pulsed laser operation, Plasmas, Laser development, Optical pumping, Diffraction

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Proceedings Article | 19 December 2003 Paper

Paper

Preplasma conditions for the operation of 10-Hz sub-Joule fs-laser-pumped nickel-like x-ray lasers

Riccardo Tommasini, Klaus Eidmann, Tetsuya Kawachi, Ernst Fill

Proceedings Volume 5197, (2003) https://doi.org/10.1117/12.503823

KEYWORDS: Plasmas, X-ray lasers, Molybdenum, Silver, Pulsed laser operation, Interferometry, Prisms, Interferometers, Picosecond phenomena, Neon

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Proceedings Article | 12 December 2003 Paper

Paper

X-ray spectroscopic study on femto- and pico-second laser irradiated solid and gaseous targets

Masayuki Suzuki, Hiroyuki Daido, Fumiaki Matsuoka, Etsuya Yanase, Mamiko Nishiuchi, Keiko Suto, A. Sasaki, Koichi Yamakawa, Tetsuya Kawachi, Keisuke Nagashima, Takatsugu Oketa, Takeyoshi Nakayama, Ingo Uschmann, Eckhart Foerster, Henryk Fiedorowicz

Proceedings Volume 5228, (2003) https://doi.org/10.1117/12.536791

KEYWORDS: X-rays, Pulsed laser operation, Plasma, Spectroscopy, Laser energy, Krypton, Nitrogen, Oxygen, Ions, Xenon

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Proceedings Article | 12 December 2001 Paper

Paper

X-ray laser research at Advanced Photon Research Center of JAERI, Kansai

Masataka Kado, Tetsuya Kawachi, Momoko Tanaka, Noboru Hasegawa, Kenjiro Takahashi, Shinichi Namba, Kouta Sukegawa, Akira Sasaki, Peixiang Lu, Huajing Tang, Keisuke Nagashima, Hiroyuki Daido, Alexander Kilpio, Yoshiaki Kato

Proceedings Volume 4505, (2001) https://doi.org/10.1117/12.450603

KEYWORDS: X-ray lasers, Plasma, Silver, Tin, Picosecond phenomena, Mirrors, Laser energy, X-rays, Pulsed laser operation, Electrons

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Proceedings Article | 12 December 2001 Paper

Paper

Higher harmonic generation for the high coherent x-ray laser

Noboru Hasegawa, Alexander Kilpio, Keisuke Nagashima, Tetsuya Kawachi, Masataka Kado, Momoko Tanaka, Shinichi Namba, Kenjiro Takahashi, Kouta Sukegawa, Peixiang Lu, Huajing Tang, Maki Kishimoto, Tai Renzhong, Hiroyuki Daido, Yoshiaki Kato

Proceedings Volume 4505, (2001) https://doi.org/10.1117/12.450592

KEYWORDS: X-ray lasers, X-rays, Amplifiers, Spatial coherence, Titanium, Picosecond phenomena, Laser systems engineering, Sapphire lasers, Spectroscopy, Harmonic generation

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Proceedings Article | 11 January 2000 Paper

Paper

Development of tabletop transient collisional excitation x-ray lasers

Masataka Kado, Tetsuya Kawachi, Noboru Hasegawa, Momoko Tanaka, Kouta Sukegawa, Keisuke Nagashima, Akira Nagashima, Yoshiaki Kato

Proceedings Volume 3886, (2000) https://doi.org/10.1117/12.375119

KEYWORDS: X-ray lasers, Laser systems engineering, Pulsed laser operation, Plasmas, Laser energy, Refraction, Laser development, Amplifiers, X-rays, Solids

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Proceedings Article | 21 October 1999 Paper

Paper

Development of a CPA Nd:glass/Ti sapphire laser system for generation of coherent x-ray laser radiation

Masataka Kado, Akira Nagashima, Keisuke Nagashima, Tetsuya Kawachi, Noboru Hasegawa, Momoko Tanaka, T. Hosokai, Kouta Sukegawa, A. Sasaki, Yoshiaki Kato

Proceedings Volume 3776, (1999) https://doi.org/10.1117/12.366674

KEYWORDS: X-ray lasers, Laser systems engineering, Pulsed laser operation, Plasmas, Laser energy, Refraction, Optical amplifiers, Solids, Laser development, Metals

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Showing 5 of 31 publications

Conference Committee Involvement (2)

Compact Radiation Sources from EUV to Gamma-rays: Development and Applications II

7 April 2025 | Prague, Czech Republic

Compact Radiation Sources from EUV to Gamma-rays: Development and Applications

25 April 2023 | Prague, Czech Republic

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