Proton emission by TiH2 laser ablation at different wavelengths

Abstract

Ns-pulsed lasers operating in the electromagnetic regions from infrared to visible and to ultraviolet, with single pulse or repetition rate mode, were employed to produce non-equilibrium plasmas by ablating titanium hydrate targets. The ion emission from the plasma was monitored through time-of-flight (TOF) measurements of emitted species, performed by using an ion collector (IC) placed along the normal to the target surface and a mass quadrupole spectrometer (MQS). Measurements demonstrated that for laser intensity ranging from 108 to 1011 W/cm2 the ion kinetic energy and the ion yield are proportional to the pulse intensity and to the laser wavelength square. Obtained results at three different wavelengths are compared and discussed.