Graded index fiber as an all-fiber saturable absorber for large energy conventional soliton and dissipative soliton generation

Zhaokun Wang; Jikai Chen; Tianyu Zhu; D. N. Wang; Feng Gao

doi:10.1364/PRJ.7.001214

Journals >Photonics Research >Volume 7 >Issue 11 >Page 1214 > Article

Photonics Research
Vol. 7, Issue 11, 1214 (2019)

Graded index fiber as an all-fiber saturable absorber for large energy conventional soliton and dissipative soliton generation

Zhaokun Wang, Jikai Chen, Tianyu Zhu, D. N. Wang^*, and Feng Gao

Author Affiliations

College of Optical and Electronic Technology, China Jiliang University, Hangzhou 310018, China

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DOI: 10.1364/PRJ.7.001214 Cite this Article Set citation alerts

Zhaokun Wang, Jikai Chen, Tianyu Zhu, D. N. Wang, Feng Gao. Graded index fiber as an all-fiber saturable absorber for large energy conventional soliton and dissipative soliton generation[J]. Photonics Research, 2019, 7(11): 1214 Copy Citation Text

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Abstract

In this work, we investigate the possibility of achieving nanojoule level pulse energy in an all-fiber Er-doped oscillator by using a graded index multimode fiber (GIMF) as the saturable absorber (SA). This GIMF-based SA demonstrates the desirable characteristics of high-power tolerance, large modulation depth of 29.6%, and small saturation fluence of

～ 7.19 \times 10^{3} μJ / {cm}^{2}

, which contribute to the high-energy soliton generation. In the experiments, the oscillator generates stable ultrafast pulse trains with high pulse energy/average output power up to 13.65 nJ/212.4 mW in the anomalous regime and 6.25 nJ/72.5mW in the normal regime, which are among the highest energy/average output power values achieved by all-fiber Er lasers. The results obtained demonstrate that the GIMF-based SA can be used as an effective photonic device for high-energy wave-breaking free pulse generation.