Nan Chen

Effects of Nanomaterial Saturable Absorption on Passively Mode-Locked Fiber Lasers in an Anomalous Dispersion Regime: Simulations and Experiments

In recent years, several kinds of nanomaterials have been successfully used for passive mode-locking, but it is not fully understand how the mode-locking performance is influenced by the different characteristics of these saturable absorbers (SAs). In this paper, we numerically and experimentally investigate the effects of nanomaterial saturable absorption (e.g., modulation depth and saturation intensity) on a passively mode-locked fiber laser in an anomalous dispersion regime. First, by numerically solving the Ginzburg–Landau equation, we analyze the evolution of the output performances (spectral bandwidth, pulse duration, and peak power) of passively mode-locked Er<inline-formula> <tex-math notation=LaTeX>

Power-ratio tunable dual-wavelength laser using linearly variable Fabry–Perot filter as output coupler

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Intermode beating mode-locking technique for a rare-earth-doped fiber pulsed laser

</tex-math></inline-formula>-doped fiber laser as the SAs modulation depth or saturation intensity. Then, we fabricate four nanomaterial-based SAs, which have the different modulation depth from 1.8% to 19.1%, the different saturation intensity from 11 to 180xa0MW/cm<inline-formula> <tex-math notation=LaTeX>

Laser diode end-pumped continuous-wave laser operation at 1339 nm in Nd : GGG with nearly diffraction-limited beam quality

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Cascaded Brillouin, Raman, and Four-Wave-Mixing Generation in a 1.06-μm Microsphere-Feedback Yb-Fiber Laser

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2 µm high-power dissipative soliton resonance in a compact σ-shaped Tm-doped double-clad fiber laser

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Metal-dielectric metameric filters for optically variable devices

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2-D materials-based passively Q-switched 635 nm Pr 3+ -doped ZBLAN fiber lasers

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All-dielectric metameric filters for optically variable devices

</tex-math></inline-formula>-doped fiber laser using the four nanomaterial-based SAs, respectively. Our results reveal that: 1) as the modulation depth increases, the mode-locked spectral bandwidth becomes wide and the pulse duration becomes short; and 2) the SAs saturation intensity has little influence on the output performance. The experimental results are in good agreement with the numerical simulations. This work could provide a useful guideline for choosing proper nanomaterial-based SA for different practical applications.

Effects of nanomaterial saturable absorption on gain-guide soliton in a positive group-dispersion fiber laser: Simulations and experiments

For a linearly variable Fabry-Perot filter, the peak transmission wavelengths change linearly with the transverse position shift of the substrate. Such a Fabry-Perot filter is designed and fabricated and used as an output coupler of a c-cut Nd:YVO4 laser experimentally in this paper to obtain a 1062 and 1083 nm dual-wavelength laser. The peak transmission wavelengths are gradually shifted from 1040.8 to 1070.8 nm. The peak transmission wavelength of the Fabry-Perot filter used as the output coupler for the dual-wavelength laser is 1068 nm and resides between 1062 and 1083 nm, which makes the transmissions of the desired dual wavelengths change in opposite slopes with the transverse shift of the filter. Consequently, powers of the two wavelengths change in opposite directions. A branch power, oppositely tunable 1062 and 1083 nm dual-wavelength laser is successfully demonstrated. Design principles of the linear variable Fabry-Perot filter used as an output coupler are discussed. Advantages of the method are summarized.