2024/04/18 by Starikovskiy, Andrey, Dogariu, Arthur
#Atomic Physics (physics.atom-ph) #FOS: Physical sciences #Instrumentation and Detectors (physics.ins-det) #Optics (physics.optics) #Plasma Physics (physics.plasm-ph)
paper · doi:10.48550/arxiv.2404.11909
A new calibration method for H-fs-TALIF is proposed, and the ratio of two-photon absorption cross-sections, σ(2), for atomic hydrogen (H) and krypton (Kr) is determined for the broadband emission of a femtosecond laser system. The estimated ratio of the two-photon absorption cross-sections for H and Kr is σ(2) for H and Kr σ(2)(Kr)/σ(2)(H) = 0.027± 20%, which is nearly twenty times lower than values previously obtained with narrowband nanosecond lasers. This discrepancy highlights the need for independent calibration of TALIF measurements for a specific laser pulsewidth range.