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

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...

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Bibliographic Details
Published in:Optics express 2024-02, Vol.32 (5), p.8020-8029
Main Authors: Jonušas, Mindaugas, Bournet, Quentin, Bonvalet, Adeline, Natile, Michele, Guichard, Florent, Zaouter, Yoann, Georges, Patrick, Druon, Frédéric, Hanna, Marc, Joffre, Manuel
Format: Article
Language:English
Subjects:
Optics
Physics
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Summary: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 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.
ISSN:1094-4087
1094-4087
DOI:10.1364/OE.515291