Reduced graphene oxide as saturable absorbers for erbium-doped passively mode-locked fiber laser<xref rid="cpb_27_8_084206_fn1" ref-type="fn">*</xref> <fn id="cpb_27_8_084206_fn1"> <label>*</label> <p>Project supported by the Central University Special Fund for Basic Research and Operating Expenses, China (Grant No. GK201702005), the Natural Science Foundation of Shaanxi Province, China (Grant No. 2017JM6091), the National Natural Science Foundation of China (Grant No. 61705183), and the Fundamental Research Funds for the Central Universities (Grant No. 2017TS011).</p> </fn>

Reduced graphene oxide as saturable absorbers for erbium-doped passively mode-locked fiber laser* *

Project supported by the Central University Special Fund for Basic Research and Operating Expenses, China (Grant No. GK201702005), the Natural Science Foundation of Shaanxi Province, China (Grant No. 2017JM6091), the National Natural Science Foundation of China (Grant No. 61705183), and the Fundamental Research Funds for the Central Universities (Grant No. 2017TS011).

Chen Zhen-Dong¹, Wang Yong-Gang^{1, †}, Li Lu², Lv Rui-Dong¹, Wei Liang-Lei¹, Liu Si-Cong¹, Wang Jiang¹, Wang Xi³

(color online) XPS spectra of (a) GO and (b) RGO.