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Proceedings Paper

2.9-μm passively Q-switched fiber laser using Au-nanocages as saturable absorber
Author(s): Qingru Li; Chen Wei; Hao Chi; Liqiang Zhou; Shurong Jiang; Han Zhang; Hua Huang; Yong Liu
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Paper Abstract

Q-switched fiber lasers emitting at around 3 μm have been widely applied in various scientific and industrial fields, such as molecular spectroscopy, laser surgery, material processing, remote sensing, and mid-infrared (mid-IR) supercontinuum source generation. Au nanocages (Au-NCs) have attracted much attention recently due to their outstanding saturable absorption properties including broadband absorption, ultrafast optical response (a few picoseconds), and large third-order optical nonlinearity coefficient that caused by local surface plasmon resonance (LSPR). We propose and demonstrate a tunable Er3+ doped ZBLAN fiber laser using Au-NCs as a Q-switcher for the first time. Nonlinear absorption of the Au-NCs was measured by a home-made Ho3+/Pr3+ co-doped mode-locked fiber laser at 2850 nm. The measured modulation depth, saturation intensity and non-saturation loss are 10.73%, 0.11 MW/cm2 and 3.26%, respectively. The central wavelength of the Q-switched pulses could be tuned across 54.1 nm (from 2753.0 to 2807.1 nm). The Q-switched fiber laser delivers a maximum average power of 253.7 mW with corresponding pulse energy of 4.06 μJ and pulse width of 1.30 μs at repetition rate of 62.5 kHz. Our work shows the Au-NCs are promising saturable absorbers (SAs) for 3 μm mid-infrared (mid-IR) pulse generation.

Paper Details

Date Published: 19 November 2019
PDF: 6 pages
Proc. SPIE 11181, High-Power Lasers and Applications X, 111810C (19 November 2019); doi: 10.1117/12.2537674
Show Author Affiliations
Qingru Li, Univ. of Electronic Science and Technology of China (China)
Sichuan Univ. (China)
Chen Wei, Univ. of Electronic Science and Technology of China (China)
Hao Chi, Univ. of Electronic Science and Technology of China (China)
Liqiang Zhou, Sichuan Univ. (China)
Shurong Jiang, Sichuan Univ. (China)
Han Zhang, Sichuan Univ. (China)
Hua Huang, Sichuan Univ. (China)
Yong Liu, Univ. of Electronic Science and Technology of China (China)

Published in SPIE Proceedings Vol. 11181:
High-Power Lasers and Applications X
Ruxin Li; Upendra N. Singh; Shibin Jiang, Editor(s)

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