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Non-degenerate two photon absorption enhancement for laser dyes by precise lock-in detection

Abstract : This study demonstrates a measurement system for a non-degenerate two-photon absorption (NDTPA) spectrum. The NDTPA light sources are a white light super continuum beam (WLSC, 500 ∼ 720 nm) and a fundamental beam (798 nm) from a Ti:Sapphire laser. A reliable broadband NDTPA spectrum is acquired in a single-shot detection procedure using a 128-channel lock-in amplifier. The NDTPA spectra for several common laser dyes are measured. Two photon absorption cross section enhancements are found in the experiment and validated by theoretical calculation for all of the chromophores
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B. Xue, C. Katan, J. A. Bjorgaard, T Kobayashi. Non-degenerate two photon absorption enhancement for laser dyes by precise lock-in detection. AIP Advances, American Institute of Physics- AIP Publishing LLC, 2015, 5 (12), pp.127138. ⟨10.1063/1.4939568⟩. ⟨hal-01269750⟩

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