Title :
Efficient CW operation of a 2.9 mu m Ho3+-doped fluorozirconate fibre laser pumped at 640 nm
Author_Institution :
Tech. Univ., Braunschweig, West Germany
fDate :
6/21/1990 12:00:00 AM
Abstract :
CW laser operation of a Ho3+-doped ZBLAN multimode fibre, emitting within the range 2.83-2.95 mu m, was achieved by optical pumping at 640 nm, as a result of excited state absorption of the pump. Thresholds were approximately 65 mW absorbed power for a 90% output coupler and approximately 290 mW with reflection of the fibre end only. Slope efficiencies and maximum output powers were 2.9% and 12.6 mW, and 4.4% and 10.2 mW, respectively.
Keywords :
aluminium compounds; barium compounds; fibre optics; holmium; lanthanum compounds; laser transitions; optical pumping; sodium compounds; solid lasers; zirconium compounds; 10.2 mW; 12.6 mW; 2.9 micron; 2.9 percent; 4.4 percent; CW operation; ZrF 4-BaF 2-LaF 3-AlF 3-NaF:Ho; absorbed power; excited state absorption; fibre end; maximum output powers; multimode fibre; optical pumping; output coupler; slope efficiencies;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:19900577
