Abstract
The gain and saturation intensity of the green Ho-doped fluorozirconate (ZBLAN) glass fiber amplifier and laser, pumped in the red (643 /spl les/ /spl lambda//sub p/ /spl les/ 649 nm; /sup 5/F/sub 5/ /spl larr/ /sup 5/I/sub 8/), have been measured. For a 2.4-/spl mu/m core diameter fiber 45 cm in length, the single-pass gain at 543.4 nm exceeds 12 dB for 90 mW of pump power at 643.5 nm. The saturation power for the /sup 5/F/sub 4/, /sup 5/S/sub 2/ /spl rarr/ /sup 5/I/sub 8/ lasing transition was determined from gain measurements to be 970 /spl plusmn/ 175 /spl mu/W, which corresponds to a saturation intensity of 19.8 /spl plusmn/ 3.5 kW /spl middot/ cm/sup -2/, and a stimulated emission cross section approximately one order of magnitude larger than theoretical estimates.
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