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cw laser action has been observed at 24 wavelengths in the visible spectrum of Se II in a He–Se discharge. The wavelengths range from 4604 to 6535 Å. A power output of 30 mW was measured on six lines oscillating simultaneously. We obtained as many as 13 wavelengths lasing at the same time in a cavity with broad-band high-reflectivity mirrors.
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Silfvast et al. (1970) studied this question.
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