Shielding effects in interaction of nanosecond laser pulses with solid target

Atomic spectrometry update: review of advances in atomic spectrometry and related techniques

“…Stark widths for 16 W II lines were determined by Dojić et al 69 using an LIP. Using He as the ambient gas they were able to minimise Doppler splitting but still have minimal selfabsorption and n e high enough to produce broadening of spectral lines.…”

Observation of blackbody-like emission from laser-induced plasma at early times and implications for thermal equilibrium

“…The beams of the two lasers are carefully adjusted beam to beam, to pass through the same region of the plasma, see figure 1. The experiment is conducted as follows [10]: at each z position the beam intensity of both lasers is recorded for a predefined set of delays relative to the Nd:YAG trigger pulse. Due to interaction with LIP, the intensities are more or less attenuated depending on the delay τ and z position.…”

“…As a consequence, measurements of electron temperature and number density are, in fact, the values in the plasma interior. The procedure for absorption coefficient evaluation is detailed in section 3 of [10]. However, the spectrum is, to a large extent, still continuous and provides a method for estimation of a radiation temperature attributed to a specific plasma slice.…”

“…In [9], the authors report that the plasma created in highpressure Xe by a femtosecond laser pulse radiates as a nearly black body with emissivity close to one measured with 15% accuracy. Also, it is found that the gas temperature, immediately after the breakdown, is about 16 000 K. In [10], the authors present measurement of target shielding caused by the plasma at the early stage of development. The strong attenuation of a He-Ne laser beam indicates that the plasma is dense but still partially transparent, regardless of continuous nearly black-body emission across the visible spectrum.…”