Abstract

A pulse-amplitude-modulated form of the Reiche–Ladenburg reabsorption technique has been devised to determine relative transition probabilities for a number of spectral lines terminating on the He 21S level. The technique provides accurate upward branching ratios from metastable levels. The experimental results indicate that such methods may be used to complement values obtained from detailed current theoretical calculations, even for extensively studied gases such as helium. Absolute gain values for several of the weaker He–Ne visible laser transitions were also determined.

© 1971 Optical Society of America

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