Abstract
We report the coherent excitation of the vibrational state of hydrogen molecules by two-photon absorption and the resultant third-harmonic generation (THG). Parahydrogen molecules cooled by liquid nitrogen are irradiated by mid-infrared nanosecond pulses at 4.8 μm with a nearly Fourier-transform-limited linewidth. The first excited vibrational state of parahydrogen is populated by two-photon absorption of the mid-infrared photons. Because of the narrow linewidth of the mid-infrared pulses, coherence between the ground and excited states is sufficient to induce higher-order processes. Near-infrared photons from the THG are observed at 1.6 μm. The dependence of the intensity of the near-infrared radiation on mid-infrared pulse energy, target pressure, and cell length is determined. We used a simple formula for THG with consideration of realistic experimental conditions to explain the observed results.
| Original language | English |
|---|---|
| Article number | 015401 |
| Journal | Journal of Physics B: Atomic, Molecular and Optical Physics |
| Volume | 51 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - Jan 14 2018 |
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Keywords
- hydrogen molecule
- molecular vibration
- third-harmonic generation
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics
- Condensed Matter Physics
Cite this
Vibrational excitation of hydrogen molecules by two-photon absorption and third-harmonic generation. / Miyamoto, Yuki; Hara, Hideaki; Hiraki, Takahiro; Masuda, Takahiko; Sasao, Noboru; Uetake, Satoshi; Yoshimi, Akihiro; Yoshimura, Koji; Yoshimura, Motohiko.
In: Journal of Physics B: Atomic, Molecular and Optical Physics, Vol. 51, No. 1, 015401, 14.01.2018.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Vibrational excitation of hydrogen molecules by two-photon absorption and third-harmonic generation
AU - Miyamoto, Yuki
AU - Hara, Hideaki
AU - Hiraki, Takahiro
AU - Masuda, Takahiko
AU - Sasao, Noboru
AU - Uetake, Satoshi
AU - Yoshimi, Akihiro
AU - Yoshimura, Koji
AU - Yoshimura, Motohiko
PY - 2018/1/14
Y1 - 2018/1/14
N2 - We report the coherent excitation of the vibrational state of hydrogen molecules by two-photon absorption and the resultant third-harmonic generation (THG). Parahydrogen molecules cooled by liquid nitrogen are irradiated by mid-infrared nanosecond pulses at 4.8 μm with a nearly Fourier-transform-limited linewidth. The first excited vibrational state of parahydrogen is populated by two-photon absorption of the mid-infrared photons. Because of the narrow linewidth of the mid-infrared pulses, coherence between the ground and excited states is sufficient to induce higher-order processes. Near-infrared photons from the THG are observed at 1.6 μm. The dependence of the intensity of the near-infrared radiation on mid-infrared pulse energy, target pressure, and cell length is determined. We used a simple formula for THG with consideration of realistic experimental conditions to explain the observed results.
AB - We report the coherent excitation of the vibrational state of hydrogen molecules by two-photon absorption and the resultant third-harmonic generation (THG). Parahydrogen molecules cooled by liquid nitrogen are irradiated by mid-infrared nanosecond pulses at 4.8 μm with a nearly Fourier-transform-limited linewidth. The first excited vibrational state of parahydrogen is populated by two-photon absorption of the mid-infrared photons. Because of the narrow linewidth of the mid-infrared pulses, coherence between the ground and excited states is sufficient to induce higher-order processes. Near-infrared photons from the THG are observed at 1.6 μm. The dependence of the intensity of the near-infrared radiation on mid-infrared pulse energy, target pressure, and cell length is determined. We used a simple formula for THG with consideration of realistic experimental conditions to explain the observed results.
KW - hydrogen molecule
KW - molecular vibration
KW - third-harmonic generation
UR - http://www.scopus.com/inward/record.url?scp=85038613121&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85038613121&partnerID=8YFLogxK
U2 - 10.1088/1361-6455/aa9782
DO - 10.1088/1361-6455/aa9782
M3 - Article
AN - SCOPUS:85038613121
VL - 51
JO - Journal of Physics B: Atomic, Molecular and Optical Physics
JF - Journal of Physics B: Atomic, Molecular and Optical Physics
SN - 0953-4075
IS - 1
M1 - 015401
ER -