Studies on Pulsed and CW Optogalvanic Effects in In-House Developed See-Through Lithium Hollow Cathode

We report on pulsed and cw optogalvanic (OG) effects in hollow cathode discharge lamp developed in-house. Pulsed OG signatures for lithium (2S(1/2) -> 2P(1/2,3/2)) fine transitions are observed at wavelengths 670.791 and 670.776 nm obtained from copper vapor laser pumped dye laser (similar to 2 GHz line-width, 50 mW avg. power) system. Inverted OG effect is observed at 659.895 (1s(2) -> 2p(2)), 667.827 (1s(2) -> 2p(4)), and (1s(2) -> 2p(5)) 671.704 nm transitions in neon (buffer gas) OG signals and explained based on population inversion created in the discharge medium. In an another OG set up, Doppler broadening effects on lithium OG signal are studied using CW ring dye laser excitation and phase sensitive detection method. Studies carried out would be helpful to us in isotopic-selective excitations of lithium in combination with TOF mass-spectrometer.