Prof. Akihiro Sasoh Profile

Prof. Akihiro Sasoh

Professor at Nagoya Univ

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Publications (8)

Proceedings Article | 12 July 2023 Open Access

Study of laser ablation induced impulse for laser space debris removal

Katsuhiko Tsuno, Satoshi Wada, Takayo Ogawa, Norihito Saito, Tadanori Fukushima, Toshikazu Ebisuzaki, Yusuke Nakamura, Akihiro Sasoh

Proceedings Volume 12777, 1277762 (2023) https://doi.org/10.1117/12.2691109

KEYWORDS: Laser ablation, Second harmonic generation, Satellites, Laser irradiation, Plasma, Nd:YAG lasers, Pulsed laser operation, Pendulums, Astronomical imaging, Vacuum

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Even a low failure rate means that dozens of satellites could lose control and become debris. Because they are located in an operational orbit, they pose a serious problem. Therefore, a few active debris removal (ADR) ideas have been proposed, which is to tow and de-orbit debris satellites with rescue satellites similar to tugboats for shipwrecks. In these cases, physical contact, such as towing by wire, is a prerequisite. Mechanical coupling between satellites involves risks such as the collision between satellites and loss of attitude control at the time of coupling. Since no cooperation between the two satellites is not desirable, mechanical contact is very difficult when the debris has high angular momentum. On the other hand, the contactless debris removing idea, to irradiate debris satellites with lasers and use of the laser ablation induced impulse, has been proposed. In this approach ti, is important to accumulate data on how much impulse is generated by the plasma plume produced by laser ablation in a vacuum. A compact and efficient measurement device to measure this impulse has been developed. In this study, we investigated impulses generated by a 10ns Q-switched Nd:YAG laser (1064nm) and its second harmonic generation (SHG, 532nm) using a metal as a target for laser irradiation. The results show that the fundamental (1064nm) laser of about 100W can generate enough thrust to deorbit space debris with comparable mass to a small satellite from 1000km to 500km altitude in a year. SHG can be converted to impulse more efficiently than 1064nm. The use of 532nm alone, including the SHG generation efficiency, has less impact on the impulse generation effect than the use of 1064nm fundamental alone, without SHG. It was pointed out that the energy of the Nd:YAG laser effectively uses generation of impulse when the remaining fundamental components that could not be converted to SHG could be used to irradiate to generate ablation. Although the use of SHG is not effective in terms of 1064nm fundamental power including SHG generation efficiency, it is demonstrated that the energy of the Nd:YAG laser can be efficiently utilized by using the remaining fundamental components that could not be converted to SHG.

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Proceedings Article | 15 May 2008 Paper

Wall-ablative laser-driven in-tube accelerator

Akihiro Sasoh, Shingo Suzuki, Atsushi Matsuda

Proceedings Volume 7005, 70050Z (2008) https://doi.org/10.1117/12.786500

KEYWORDS: Curium, Carbon dioxide lasers, Pulsed laser operation, Gas lasers, Laser ablation, Laser energy, Aerodynamics, Collimation, Aerospace engineering, Laser development

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Proceedings Article | 7 June 2006 Paper

Acceleration history in laser-ablative impulse measured using velocity interferometer (VISAR)

Koichi Mori, Kohei Anju, Akihiro Sasoh, Eugene Zaretsky

Proceedings Volume 6261, 626125 (2006) https://doi.org/10.1117/12.669426

KEYWORDS: Velocity measurements, Pulsed laser operation, Laser ablation, Gas lasers, Interferometers, Polymers, Aluminum, Carbon monoxide, Nd:YAG lasers, Laser beam diagnostics

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Proceedings Article | 20 September 2004 Paper

Laser impulse generation required for space debris deorbiting

Keiko Watanabe, Akihiro Sasoh

Proceedings Volume 5448, (2004) https://doi.org/10.1117/12.548136

KEYWORDS: Laser ablation, Pulsed laser operation, High power lasers, Laser energy, System on a chip, Carbon dioxide lasers, Mirrors, Laser beam diagnostics, Aluminum, Aerospace engineering

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Proceedings Article | 13 September 2002 Paper

Impulse enhancement by in-tube operation in laser propulsion

Akihiro Sasoh, Naohide Urabe, Sukyum Kim

Proceedings Volume 4760, (2002) https://doi.org/10.1117/12.482042

KEYWORDS: Laser propulsion, Laser energy, Argon, Xenon, Gas lasers, Chemical species, Carbon monoxide, Pulsed laser operation, Laser development, Calibration

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Proceedings Article | 17 April 2001 Paper

Time-resolved spectroscopy in the shock layer of a blunt body placed in an expansion tube flow

Djameel Ramjaun, Akihiro Sasoh, Yasuyuki Ohnishi, Kazuyoshi Takayama

Proceedings Volume 4183, (2001) https://doi.org/10.1117/12.424337

KEYWORDS: Spectroscopy, Time resolved spectroscopy, Streak cameras, Imaging systems, Calibration, Photonics, High speed photography, Spectrographs, CCD cameras, High dynamic range imaging

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Proceedings Article | 17 April 2001 Paper

Observation of breakdown induced by CO2 laser focusing in an in-tube laser propulsion configuration

Akihiro Sasoh, Djameel Ramjaun, Yuichiro Hamate, Kazuyoshi Takayama

Proceedings Volume 4183, (2001) https://doi.org/10.1117/12.424243

KEYWORDS: Laser propulsion, Carbon dioxide lasers, Spectrographs, Streak cameras, Image intensifiers, Laser energy, Time resolved spectroscopy, CCD cameras, Laser development, Charge-coupled devices

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Proceedings Article | 30 May 1995 Paper

Holographic interferometric observation of weak shock waves generated by entrance of a high-speed train into a long tunnel

Kazuyoshi Takayama, Akihiro Sasoh, Osamu Onodera, Ji-Ming Yang, Hidenori Ojima, Toshihiro Ogawa, Ryuichi Kaneko, Osamu Matsui

Proceedings Volume 2513, (1995) https://doi.org/10.1117/12.209615

KEYWORDS: Holographic interferometry, Head, Visualization, Optical simulations, Holography, Beam splitters, Mirrors, Wave propagation interference, Holograms, Wave propagation

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Showing 5 of 8 publications

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