An alternative referencing scheme that suppresses large noise contributions in ultrafast transient absorption spectroscopy with broadband Vis-NIR detection

Julien Réhault; Kaila Yallum; Natalie Banerji

doi:10.1117/12.3022964

11 June 2024 An alternative referencing scheme that suppresses large noise contributions in ultrafast transient absorption spectroscopy with broadband Vis-NIR detection

Julien Réhault, Kaila Yallum, Natalie Banerji

Author Affiliations +

Proceedings Volume PC12992, Advances in Ultrafast Condensed Phase Physics IV; PC129920C (2024) https://doi.org/10.1117/12.3022964
Event: SPIE Photonics Europe, 2024, Strasbourg, France

Abstract

We present a new referencing scheme for visible and near infrared ultrafast Transient Absorption (TA) measurements using a signal and a referencing beam. Instead of using the traditional ratiometric approach, where the absorption changes are referenced at each wavelength independently, we use a method used in the infrared range that fully utilized the spectral correlation between the reference and signal. We applied this method on a setup that produces an ultrabroad white light (WL) probe beam spanning the 600-1700nm range. This WL is noisy as it is generated from the Idler of an optical parametric amplifier in a YAG crystal. The new referencing scheme allowed to completely suppress the noise introduced by the WL generation. We will present the method, the setup and its application to some new organic semiconducting materials used or photovoltaic applications that benefited a lot from the broad spectral coverage and the low noise of our TA setup.

Conference Presentation

Citation Download Citation

Julien Réhault, Kaila Yallum, and Natalie Banerji "An alternative referencing scheme that suppresses large noise contributions in ultrafast transient absorption spectroscopy with broadband Vis-NIR detection", Proc. SPIE PC12992, Advances in Ultrafast Condensed Phase Physics IV, PC129920C (11 June 2024); https://doi.org/10.1117/12.3022964

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