Abstract
Upconversion is an efficient way for the development of visible sources pumped in the near infrared. Recently, we have observed fairly intense green light in both Er-doped and Er/Yb-doped single-mode silica fiber pumped by laser diode (LD). The wavelength of pumped light is 0.8 μm. When the pumped light is launched into the fiber from one end, the Er3+ ions were pumped into the 4I9/2 energy level (see Fig. 1), then decayed to the metastable state 4I13/2· The Er3+ ions at the state
© 1992 Optical Society of America
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