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Room-temperature vibronic pulsed laser action in trivalent chromium-activated forsterite (Cr3+: Mg2Si04) is reported for the first time. The free-running laser emission is centered at 1235 nrn of the broad 4 Tz-+ 4 A2 fiuorescence band, and has a bandwidth of~, 22 nm.

Prompted by the successful broadly wavelength-tunable, room-temperature operation of alexandrite! and ernerald2, 31asers, the surge in research activities on tunable solidstate lasers has been extensive in the 19808.4-. 17 The thrust of these research endeavors has been twofold: first to look for new host materials for the trivalent chromium ion,'-!! and second, to search for new ions that will. lase in commonly used host crystahl. 4-6, 12-17 These efforts have been rewarded by the successful wavelength-tunable laser operation of Cr3 I-in a number of hosts, 7--11 by the discovery of new lasing ions trivalent titanium (Ti3+) 6, 12, 13 and divalent …