Abstract
There is considerable interest in the development of high-power tunable solid-state lasers based on phonon terminated transition of metal ions and color centers. The theory of the basic concept was proposed in the mid-1960s by McCumber.1 The successful operation of alexandrite (Cr3+ in BeAl2O4) by Walling and Peterson2 at room temperature as a tunable laser has led to the search for new crystals and glasses with broadband emission as potential laser materials. This has led us to renew re- search3,4 into chromium-doped beryllium aluminum silicate (Cr3+ in Be3AI2Si6O18)—commonly called emerald.
© 1983 Optical Society of America
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