Two-photon time-resolved optogalvanic signals of neon

Abstract

In this work, temporal evolution of two-photon laser optogalvanic signals of neon has been studied. Optogalvanic signals for four transitions from the metastable 2p 53s[3/2] 2 state to 2p 54d′[3/2] 1, 2p 54d′[3/2] 2, 2p 54d′[5/2] 3 and 2p 54d′[5/2] 2 states were recorded over a range of discharge currents (3.4–9 mA). It was found that the shape of the optogalvanic signal was strongly dependent on the discharge current so that its peak shifted to shorter times and its amplitude increased with the discharge current. The decay rates of the 4d states, calculated from the optogalvanic signals, were found to increase linearly with the discharge current in the range of 6.2–9 mA. However, for the range of 3.4–5.4 mA, the decay rates were observed to slightly decrease with the discharge current.