Jian Yang, Jiyi Hu, Hongyu Luo, Jianfeng Li, Jishu Liu, Xiaohui Li, Yong Liu, "Fe3O4 nanoparticles as a saturable absorber for a tunable Q-switched dysprosium laser around 3 μm," Photonics Res. 8, 70 (2020)

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- Photonics Research
- Vol. 8, Issue 1, 70 (2020)

Fig. 1. Characterizations of Fe 3 O 4 nanoparticle dispersion: (a) atomic structure, (b) TEM image with a 50 nm scale, (c) HRTEM image with a 5 nm scale, and (d) X-ray diffraction pattern.

Fig. 2. Nonlinear optical absorption measurement: (a) experimental setup and (b) results at 2.87 μm.

Fig. 3. Experimental setup of the tunable passively Q -switched Dy 3 + -doped ZBLAN fiber laser using Fe 3 O 4 nanoparticles as the SA. L1-L4, four lenses; DM1 and DM2, two dichroic mirrors; HT, high transmittance; HR, high reflectance.

Fig. 4. Q -switched pulse train and single pulse waveform (inset) at the launched pump powers of (a) 1.62 W and (b) 2.89 W; (c) optical and (d) RF spectra at the launched pump power of 2.89 W.

Fig. 5. (a) Pulse width and repetition rate and (b) pulse energy and output power as a function of the launched pump power.

Fig. 6. (a) Output spectrum, output power, and pulse energy, and (b) repetition rate and pulse width as a function of the wavelength at the launched pump power of 2.89 W.

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