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New Ytterbium Host Offers Efficiency and Tunability

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Yb:GYSO combines best features of Yb:GSO and Yb:YSO.

Breck Hitz

The broad absorption and emission spectra of ytterbium, together with its small quantum defect, make it an ideal laser dopant — in many ways, it is superior to the quintessential veteran, neodymium. The chief drawback of ytterbium is the small splitting between its terminal laser level and the ground state, which results in a nonnegligible thermal population of its terminal laser level. This thermal population causes reabsorption losses, increased threshold and diminished overall efficiency. Experiments published earlier this year reported a new ytterbium host, Gd2SiO5 (GSO), with a much...Read full article

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