Abstract
We present demonstration of an erbium-doped fiber laser based on the nonlinear amplifying loop mirror mechanism, with a stable phenomenon of flat-top Q-switched mode-locked (FT-QML) dissipative soliton resonance (DSR) pulse, for the first time. In the experiment, we can observe both the flat-top Q-switched envelope and square-wave pulse by the peak power clamping effect inside the cavity. The characteristics of both continuous DSR pulse and flat-top Q-switched mode-locked square-wave are analyzed comprehensively. With the maximum pump power of 363 mW, single pulse energy in the FT-QML envelope can be up to 14 nJ as three times high as the one of continuous DSR. Essentially, the temporal width of the Q-switched mode-locked envelope can reach 4.6 μs with flat-top duration of 3.5 μs. The amplitude fluctuation of the sub-pulse inside the flat-top is stable at about 0.12% by using the formula of RMSE. Therefore, the laser can provide flat-top burst mode pulse sequence, and the pulse width can be controlled by tuning the pump power.
Highlights
In recent years, passively mode-locked fiber lasers have become one of the research hotspots amongst researchers around the world due to the significant advantages of their compact structure and easy integration, fine stability, high energy conversion efficiency
We demonstrate experimentally a type flat-top Q-switched mode-locked dissipative soliton resonance pulse based on the erbium-doped passively mode-locked figure-eight cavity
In order to lucubrate the characteristics of dissipative soliton resonance (DSR) pulses, first of all, the position of the polarization controller (PC) is fixed
Summary
Passively mode-locked fiber lasers have become one of the research hotspots amongst researchers around the world due to the significant advantages of their compact structure and easy integration, fine stability, high energy conversion efficiency. It can output the high peak power and ultra-short pulses. Due to the different distribution and arrangement of dispersion in the cavity, the mode-locked fiber laser can output traditional soliton, dispersion management soliton and dissipative soliton [5]–[7]
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