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Er-doped fiber frequency comb with mHz relative linewidth.
Kim Y, Kim S, Kim YJ, Hussein H, Kim SW. Kim Y, et al. Among authors: kim yj, kim sw, kim s. Opt Express. 2009 Jul 6;17(14):11972-7. doi: 10.1364/oe.17.011972. Opt Express. 2009. PMID: 19582112 Free article.
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