Excitation mechanisms in CW He-Hg lasers

I. M. Littlewood*, J. A. Piper, C. E. Webb

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


The collision processes responsible for populating and de-populating upper and lower levels of the cw He-Hg ion laser are investigated using flowing afterglow techniques. It is shown that the superior performance of the laser at 6150 Å compared to that at 7945 Å is not due to a difference in excitation mechanism - both are excited by charge transfer from He+ - but instead reflects a greater effectiveness of second kind collisions of electrons in depopulating the 7p2P 1 2 upper level of the 7945 Å transition. The charge transfer, excitation rate constants for several Hg II levels are compared, and values for the rate constant for the electron collision de-excitation process are deduced.

Original languageEnglish
Pages (from-to)45-49
Number of pages5
JournalOptics Communications
Issue number1
Publication statusPublished - 1976
Externally publishedYes


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