Abstract
Diode laser pumped, room temperature upconversion lasers are one possible route to all solid-state visible wavelength lasers. The energy level spacing of the thulium ion is such that several visible laser transitions should be possible. Upconversion laser emission from Tm3+ at a number of visible wavelengths has been reported in bulk crystal1,2 and glass fiber3 hosts.
© 1992 Optical Society of America
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