Femtosecond and nanosecond lasers were compared forablating brass alloys. All operating parameters from bothlasers were equal except for the pulse duration. Theablated aerosol vapor was collected on silicon substratesfor particle size measurements or sent into an inductivelycoupled plasma mass spectrometer. The diameters andsize distribution of particulates were measured fromscanning electron microscope (SEM) images of the collected ablated aerosol. SEM measurements showed thatparticles ablated using nanosecond pulses were singlespherical entities ranging in diameter from several micrometers to several hundred nanometers. Primary particles ablated using femtosecond ablation were ∼100 nmin diameter but formed large agglomerates. ICPMS showedenhanced signal intensity and stability using femtosecondcompared to nanosecond laser ablation.