TY - JOUR
T1 - Two-photon photoacoustic spectroscopy of liquid solutions under degenerate and non-degenerate laser excitation
AU - Sakurai, Shiori
AU - Isoda, Miki
AU - Harata, Akira
N1 - Funding Information:
This work was supported by a Grant-in-aid for Scientific Research (KAKENHI) [No. JP18H03915] from the Japan Society for the Promotion of Science.
Publisher Copyright:
© 2023 The Author(s). Published on behalf of The Japan Society of Applied Physics by IOP Publishing Ltd.
PY - 2023/7/1
Y1 - 2023/7/1
N2 - A new apparatus to measure the two-photon (2P) absorption of a dilute liquid solution is designed using tunable laser excitation with an optical parametric oscillator and photoacoustic (PA) detection. Two-photon absorption of non- or less-fluorescent solute molecules in dilute liquid solutions was investigated. When PA signal intensity was plotted versus half of an excitation laser wavelength, a degenerate 2P PA spectrum of nitrobenzene showed a shape similar to that of the absorption spectrum, as expected from Laporte’s selection rule, with a slight red shift. The non-degenerate 2P PA spectrum of diphenylacetylene was compared with the degenerate 2P PA spectrum and good matching was observed. Results demonstrate that this method is suitable for observing 2P absorption for weakly fluorescent substances.
AB - A new apparatus to measure the two-photon (2P) absorption of a dilute liquid solution is designed using tunable laser excitation with an optical parametric oscillator and photoacoustic (PA) detection. Two-photon absorption of non- or less-fluorescent solute molecules in dilute liquid solutions was investigated. When PA signal intensity was plotted versus half of an excitation laser wavelength, a degenerate 2P PA spectrum of nitrobenzene showed a shape similar to that of the absorption spectrum, as expected from Laporte’s selection rule, with a slight red shift. The non-degenerate 2P PA spectrum of diphenylacetylene was compared with the degenerate 2P PA spectrum and good matching was observed. Results demonstrate that this method is suitable for observing 2P absorption for weakly fluorescent substances.
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U2 - 10.35848/1347-4065/acb063
DO - 10.35848/1347-4065/acb063
M3 - Article
AN - SCOPUS:85147191296
SN - 0021-4922
VL - 62
JO - Japanese Journal of Applied Physics
JF - Japanese Journal of Applied Physics
IS - SJ
M1 - SJ1001
ER -