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The first erbium glass lasers at 1.54μm were made from alkali, alkaline earth silicates with ytterbium added as a sensitizer.1 They were used primarily as Q-switched oscillators for eye safe range finders.2,3 With the demonstration of CW fiber lasers doped with Nd in low loss glass,4 there followed considerable activity with CW fiber lasers with the rare earths that had lased.
© 1988 Optical Society of America
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