Experimental comparison of silica fibers for laser cooling

Knall, JenniferStanford Univ, Edward L Ginzton Lab, Stanford, CA 94305 USA. (författare)

Laser cooling in silica has recently been demonstrated, but there is still a lack of understanding on how fiber composition, core size, and OH- contamination influence cooling performance. In this work, six Yb-doped silica fibers were studied to illuminate the influence of these parameters. The best fiber cooled by -70 mK with only 170 mW/m of absorbed pump power at 1040 nm, which corresponds to twice as much heat extracted per unit length compared to the first reported laser cooling in silica. This new fiber has an extremely low OW loss and a higher Al concentration (2.0 wt.% Al), permitting a high Yb concentration (2.52 wt.% Yb) without incurring significant quenching. Strong correlations were found between the absorptive loss responsible for heating and the loss measured at 1380 nm due to absorption by OH-.

Engholm, MagnusMittuniversitetet,Institutionen för elektronikkonstruktion(Swepub:miun)mageng (författare)
Ballato, JohnClemson Univ, Dept Mat Sci & Engn, Clemson, SC 29634 USA. (författare)
Dragic, Peter D.Univ Illinois, Dept Elect & Comp Engn, Urbana, IL 61801 USA. (författare)
Yu, NanjieUniv Illinois, Dept Elect & Comp Engn, Urbana, IL 61801 USA. (författare)
Digonnet, Michel J. F.Stanford Univ, Edward L Ginzton Lab, Stanford, CA 94305 USA. (författare)
Stanford Univ, Edward L Ginzton Lab, Stanford, CA 94305 USA.Institutionen för elektronikkonstruktion (creator_code:org_t)

Av författaren/redakt...: Knall, Jennifer; Engholm, Magnus; Ballato, John; Dragic, Peter D.; Yu, Nanjie; Digonnet, Michel ...

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