Absorption spectroscopy has been a mainstay spectroscopic tool for decades with countless improvements made to increase its utility in increasingly complex applications. Despite these improvements, absorption spectroscopy is not without its drawbacks. Here, we will describe a method—femtosecond (fs) time-gated absorption spectroscopy (fs-TGAS)—which overcomes some of these drawbacks by exploiting the features of ultrafast (fs) lasers. Primarily, the high spectral bandwidth, short pulse duration, and high repetition rates inherent to ultrafast lasers allow us to record high-speed background- and collision-free absorption spectra through a time-gating approach. The benefits of this technique will be discussed along with applications to various fields, with a primary focus placed on its application to diagnostics of combusting flows. This abstract has been cleared for public release by the Air Force Research Laboratory (No. 88ABW-2017-5535).

Femtosecond time-gated absorption spectroscopy (fs-TGAS): Development of a robust method for measuring broadband, background-free absorption spectra

255th National Meeting (2018)

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