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Nonlinear effects in pulsed cavity ringdown spectroscopy of lithium vapour

We report cavity ringdown spectra of lithium vapor generated in the heat-pipe oven. Evaluation of ringdown decay curves in early and late time windows gives the change of absorption peak values as well as in the line shape profiles. Pronounced dips in the line center occur depending on molecular densities, injected laser pulse energies and chosen time window.

cavity ringdown spectroscopy; lithium vapour; absorption spectra

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