Open AccessResonance radiation trapping in Ca, Sr, Ba and Hg ion lasers
Author(s) -
Bangning Mao,
Pan Bai-Liang,
Chen Li,
Yubo Wang,
Limin Wang
Publication year - 2007
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.56.5813
Subject(s) - radiation trapping , trapping , ionization , atomic physics , metastability , lasing threshold , ion , materials science , population , ionic bonding , ground state , resonance (particle physics) , population inversion , radiation , laser , physics , optics , demography , sociology , biology , ecology , quantum mechanics
According to Holstein's theory about radiation trapping effect, the influence of gas temperature and ground-state population density on the effective lifetime of the resonance level is discussed. The results show that the ground-state population density is the dominating factor in the radiation trapping effect. The threshold parameters of radiatoin trapping have been calculated for seven resonance metastable transition laser lines in Ca+, Sr+, Ba+ and Hg+ in different ionization ratios. The threshold temperature of radiation trapping was found to be consistent with the initial lasing temperature for the ionization ratio of 5%, which matches the ionization ratio of 3% to 5% observed in experiment. This consistency reveals that the threshold condition of radiation trapping effect is an important factor for population inversion in lastrs based on the ionic resonance to metastable transition.