Passively harmonic mode-locked erbium-doped fiber laser with a gold nanofilm saturable absorber

Author:

Lv Changjian1,Meng Fanchao1,Zhang Tianqi1,Wang Junjie1,Yan Qi1,Jia Zhixu1,Qin Weiping1,Qin Guanshi1

Affiliation:

1. Jilin University

Abstract

We demonstrate a 1.5 GHz harmonic mode-locked erbium-doped fiber laser by incorporating gold nanofilm as a saturable absorber (SA). The high-quality gold nanofilm SA fabricated by the physical vapor deposition method possesses a high modulation depth of 12.9% and a low saturation intensity of 1.69 MW/cm2 at 1.56 µm, facilitating the generation of harmonic mode-locking. The fundamental mode-locked operation was obtained at 1564.7 nm, with a pulse duration of 586 fs and a repetition rate of 34.235 MHz. At the pump power of 610 mW, 44th-order harmonic mode-locking with a repetition rate of 1.506 GHz was achieved, which is the highest yet reported in mode-locked fiber lasers using gold nanomaterials as SAs. Moreover, the gold nanofilm-based harmonic mode-locked fiber laser shows relatively high signal-to-noise ratios, high output power, and good stability. These results highlight the advantage of the gold nanofilm-based SA in realizing high repetition rate laser sources.

Funder

National Key Research and Development Program of China

National Natural Science Foundation of China

the Opened Fund of the State Key Laboratory of Integrated Optoelectronics

Publisher

Optica Publishing Group

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