Dual beam transient thermal lens spectroscopy with high repetition pulsed IR-Laser Excitation: Photothermal and fluorescence quantum yields determination

A. D. Vargas-Vargas, J. L. Mejorada-Sánchez, F. R. Castellanos-Durán, E. Vargas, M. A. Isidro-Ojeda, E. Cedeño, J. B. Rojas-Trigos, A. Calderón, E. Marín

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Resumen

Based on experimental results, we demonstrated that the most widely used model for the description of the dual beam transient thermal lens spectroscopy technique also works well when a high repetition frequency pulsed pump laser is used instead of a commonly employed continuous wave source. For this, for water samples colored with a tartrazine dye, we compared the optical absorbance obtained using a continuous and a pulsed laser source emitting at the same excitation wavelength. A close to 90 % photothermal quantum yield was obtained as a function of the dye concentration. As an application, we measured the near-infrared fluorescence quantum yield spectrum of a CF®800 dye (Biotium) dissolved in water. The thermal lens signal was recorded as a function of the photon's wavelength using a tunable MAI TAI BB laser oscillator (Spectra Physics) for pumping that generates light pulses of about 80 fs at a repetition frequency of 80 MHz between 710 and 980 nm. The quantum yield spectrum and a comparison of the optical absorbance spectra measured by the thermal lens technique and a conventional transmittance experiment show a significant fluorescence quenching due to water optical absorption.

Idioma originalInglés
Número de artículo104561
PublicaciónInfrared Physics and Technology
Volumen129
DOI
EstadoPublicada - mar. 2023
Publicado de forma externa

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