Coherent two-photon emission from hydrogen molecules excited by counter-propagating laser pulses

Takahiro Hiraki; Hideaki Hara; Yuki Miyamoto; Kei Imamura; Takahiko Masuda; Noboru Sasao; Satoshi Uetake; Akihiro Yoshimi; Koji Yoshimura; Motohiko Yoshimura

doi:10.1088/1361-6455/aafbd0

Coherent two-photon emission from hydrogen molecules excited by counter-propagating laser pulses

Takahiro Hiraki, Hideaki Hara, Yuki Miyamoto, Kei Imamura, Takahiko Masuda, Noboru Sasao, Satoshi Uetake, Akihiro Yoshimi, Koji Yoshimura, Motohiko Yoshimura

Research output: Contribution to journal › Article › peer-review

7 Citations (Scopus)

Abstract

We observed two-photon emission (TPE) signal from the first vibrationally excited state of parahydrogen gas coherently excited by counter-propagating laser pulses. A single narrow-linewidth laser source has roles in the excitation of the parahydrogen molecules and the induction of the TPE process. We measured dependences of the signal energy on the detuning, target gas pressure, and input pulse energies. These results are qualitatively consistent with those obtained by numerical simulations based on Maxwell-Bloch equations with one spatial dimension and one temporal dimension. This study of the TPE process in the counter-propagating injection scheme is an important step toward neutrino mass spectroscopy.

Original language	English
Article number	045401
Journal	Journal of Physics B: Atomic, Molecular and Optical Physics
Volume	52
Issue number	4
DOIs	https://doi.org/10.1088/1361-6455/aafbd0
Publication status	Published - Jan 30 2019

Keywords

Coherence
Counter-propagating laser injection
Maxwell-Bolch equations
Parahydrogen
Two-photon emission

ASJC Scopus subject areas

Atomic and Molecular Physics, and Optics
Condensed Matter Physics

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10.1088/1361-6455/aafbd0

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Coherent two-photon emission from hydrogen molecules excited by counter-propagating laser pulses. / Hiraki, Takahiro ; Hara, Hideaki ; Miyamoto, Yuki; Imamura, Kei; Masuda, Takahiko ; Sasao, Noboru ; Uetake, Satoshi ; Yoshimi, Akihiro ; Yoshimura, Koji ; Yoshimura, Motohiko.

In: Journal of Physics B: Atomic, Molecular and Optical Physics, Vol. 52, No. 4, 045401, 30.01.2019.

Research output: Contribution to journal › Article › peer-review

Hiraki, Takahiro ; Hara, Hideaki ; Miyamoto, Yuki ; Imamura, Kei ; Masuda, Takahiko ; Sasao, Noboru ; Uetake, Satoshi ; Yoshimi, Akihiro ; Yoshimura, Koji ; Yoshimura, Motohiko. / Coherent two-photon emission from hydrogen molecules excited by counter-propagating laser pulses. In: Journal of Physics B: Atomic, Molecular and Optical Physics. 2019 ; Vol. 52, No. 4.

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title = "Coherent two-photon emission from hydrogen molecules excited by counter-propagating laser pulses",

abstract = "We observed two-photon emission (TPE) signal from the first vibrationally excited state of parahydrogen gas coherently excited by counter-propagating laser pulses. A single narrow-linewidth laser source has roles in the excitation of the parahydrogen molecules and the induction of the TPE process. We measured dependences of the signal energy on the detuning, target gas pressure, and input pulse energies. These results are qualitatively consistent with those obtained by numerical simulations based on Maxwell-Bloch equations with one spatial dimension and one temporal dimension. This study of the TPE process in the counter-propagating injection scheme is an important step toward neutrino mass spectroscopy.",

keywords = "Coherence, Counter-propagating laser injection, Maxwell-Bolch equations, Parahydrogen, Two-photon emission",

author = "Takahiro Hiraki and Hideaki Hara and Yuki Miyamoto and Kei Imamura and Takahiko Masuda and Noboru Sasao and Satoshi Uetake and Akihiro Yoshimi and Koji Yoshimura and Motohiko Yoshimura",

note = "Funding Information: This work was supported by JSPS KAKENHI Grant No. JP15H02093, No. JP15H03660, No. JP15K13486, No. JP15K17651, No. JP16J10938, No. JP17K14292, No. JP17K14363, No. JP17K18779, No. JP17H02895, and No. JP17H02896. This work was also supported by JST, PRESTO and the Matsuo Foundation.",

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AU - Hiraki, Takahiro

AU - Hara, Hideaki

AU - Miyamoto, Yuki

AU - Imamura, Kei

AU - Masuda, Takahiko

AU - Sasao, Noboru

AU - Uetake, Satoshi

AU - Yoshimi, Akihiro

AU - Yoshimura, Koji

AU - Yoshimura, Motohiko

N1 - Funding Information: This work was supported by JSPS KAKENHI Grant No. JP15H02093, No. JP15H03660, No. JP15K13486, No. JP15K17651, No. JP16J10938, No. JP17K14292, No. JP17K14363, No. JP17K18779, No. JP17H02895, and No. JP17H02896. This work was also supported by JST, PRESTO and the Matsuo Foundation.

PY - 2019/1/30

Y1 - 2019/1/30

N2 - We observed two-photon emission (TPE) signal from the first vibrationally excited state of parahydrogen gas coherently excited by counter-propagating laser pulses. A single narrow-linewidth laser source has roles in the excitation of the parahydrogen molecules and the induction of the TPE process. We measured dependences of the signal energy on the detuning, target gas pressure, and input pulse energies. These results are qualitatively consistent with those obtained by numerical simulations based on Maxwell-Bloch equations with one spatial dimension and one temporal dimension. This study of the TPE process in the counter-propagating injection scheme is an important step toward neutrino mass spectroscopy.

AB - We observed two-photon emission (TPE) signal from the first vibrationally excited state of parahydrogen gas coherently excited by counter-propagating laser pulses. A single narrow-linewidth laser source has roles in the excitation of the parahydrogen molecules and the induction of the TPE process. We measured dependences of the signal energy on the detuning, target gas pressure, and input pulse energies. These results are qualitatively consistent with those obtained by numerical simulations based on Maxwell-Bloch equations with one spatial dimension and one temporal dimension. This study of the TPE process in the counter-propagating injection scheme is an important step toward neutrino mass spectroscopy.

KW - Coherence

KW - Counter-propagating laser injection

KW - Maxwell-Bolch equations

KW - Parahydrogen

KW - Two-photon emission

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