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We report spatiotemporal evolution of emission and absorption signatures ofAl species in a nanosecond (ns) laser-produced plasma (LPP). The plasmas weregenerated from an Inconel target, which contained $\sim $ 0.4 wt.% Al, using1064 nm, ~ 6 ns full width half maximum pulses from an Nd:YAG laser at an Arcover gas pressure of ~ 34 Torr. The temporal distributions of the Al I (394.4nm) transition were collected from various spatial points within the plasmaemploying time-of-flight (TOF) emission and laser absorption spectroscopy andthey provide kinetics of the excited state and ground state population of theselected transition. The emission and absorption signatures showed multiplepeaks in their temporal profiles, although they appeared at different spatiallocations and times after the plasma onset. The absorption temporal profilesshowed an early time signature representing shock wave propagation into theambient gas. We also used emission and absorption spectral features formeasuring various physical properties of the plasma. The absorption spectralprofiles are utilized for measuring linewidths, column density, and kinetictemperature while emission spectra were used to measure excitation temperature.A comparison between excitation and the kinetic temperature was made at variousspatial points in the plasma. Our results highlight that the TOF measurementsprovide a resourceful tool for showing the spatiotemporal LPP dynamics withhigher spatial and temporal resolution than is possible with spectralmeasurements but are difficult to interpret without additional information onexcitation temperatures and linewidths. The combination of absorption andemission TOF and spectral measurements thus provides a more complete picture ofLPP spatiotemporal dynamics than is possible using any one technique alone.

Spatiotemporal evolution of emission and absorption signatures in a laser-produced plasma