Abstract
Noise-like square pulses (NLSPs) have been experimentally investigated in both normal and anomalous dispersion regimes. A chirped fiber Bragg grating (CFBG) has been employed as a dispersion management element in the compact linear-cavity mode-locked Yb-doped fiber laser. The net cavity dispersion could be switched from large anomalous dispersion (-2.71 ps <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> ) to large normal dispersion (+5.33 ps <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> ), depending on the direction of CFBG inserting in laser cavity. Two kinds of NLSPs with different temporal profiles are achieved in the proposed laser. In anomalous dispersion regime, the square pulse duration can be tuned from 0.91 ns to 5.39 ns, and the maximum square pulse energy is 39.57 nJ. In normal dispersion regime, the top of the pulse is flatter, the square pulse duration can be tuned from 0.89 ns to 5.97 ns, and the maximum square pulse energy is slightly higher, up to 40.17 nJ. The output laser is linearly polarized.
Highlights
High-energy mode-locked pulses have attracted particular attention due to their wide applications, including scientific research, industry, and biomedicine, etc
To prove whether it is dissipative soliton resonance (DSR) or Noise-like square pulses (NLSPs), we measure the pulse autocorrelation trace the square pulse duration is too wide to be integrally traced within the maximum scanning range of autocorrelator (600 ps)
The period of modulation is inversely proportional to the square pulse duration, corresponding to the square pulse duration of about 3.18 ns, which varies with the pump power
Summary
High-energy mode-locked pulses have attracted particular attention due to their wide applications, including scientific research, industry, and biomedicine, etc. To scale up the pulse energy, various pulse-shaping techniques have been applied in passively mode-locked fiber lasers by the management of dispersion and nonlinearity, including stretched pulse [1], conventional soliton [2], [3], similariton [4], and dissipative soliton [5]–[7]. Attempts to further increase the pulse energy always lead to pulse breaking due to the excessive nonlinearity induced by higher pump power [10], [11]. To achieve higher-energy pulses, more and more attention has been paid to a particular pulse forming mechanism, dissipative soliton resonance (DSR). The pulse energy and width under DSR conditions can increase infinitely with increasing pump power while the amplitude remains constant
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