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Article Dans Une Revue (Article De Synthèse) Optics Express Année : 2024

Chirped pulse upconversion for femtosecond mid-infrared spectroscopy at 100 kHz

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We demonstrate that chirped pulse up-conversion (CPU), a method routinely used with systems based on 1-kHz Titanium:Sapphire lasers, can be extended to a repetition rate of 100 kHz with an Ytterbium diode-pumped femtosecond amplifier. Individual mid-infrared spectra can thus be measured directly in the near infrared using a fast CMOS linescan camera. After an appropriate Fourier processing, a spectral resolution of 1.1 cm-1 is reported, currently limited by our spectrometer. Additionally, we demonstrate the application of CPU to a pump-probe measurement of the vibrational relaxation in carboxy-hemoglobin, and we show that the combination of fast scanning and fast acquisition enables a straightforward removal of pump scattering interference.
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hal-04482516 , version 1 (28-02-2024)

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Mindaugas Jonušas, Quentin Bournet, Adeline Bonvalet, Michele Natile, Florent Guichard, et al.. Chirped pulse upconversion for femtosecond mid-infrared spectroscopy at 100 kHz. Optics Express, 2024, 32 (5), pp.8020. ⟨10.1364/oe.515291⟩. ⟨hal-04482516⟩
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