Generation and evolution of mode-locked noise-like square-wave pulses in a large-anomalous-dispersion Er-doped ring fiber laser

Liu, Jun; Chen, Yu; Tang, Pinghua; Xu, Changwen; Zhao, Chujun; Zhang, Han; Wen, Shuangchun

doi:10.1364/oe.23.006418

Cited by 135 publications

(61 citation statements)

References 24 publications

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“…7(d), shows a double structure with a short peak riding long pedestal, which is typical of NLPs. The characteristics of the square pulses reported in this work are similar to those reported before by other authors [29,30]. Finally, Fig.…”

Section: Soliton Regime (Sr)supporting

confidence: 90%

Long cavity ring fiber mode-locked laser with decreased net value of nonlinear polarization rotation

Rodríguez-Morales¹,

Armas-Rivera²,

Ibarra-Escamilla³

et al. 2019

Opt. Express

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We investigate a new configuration of a mode-locked fiber laser by using a nonlinear polarization rotation-based design to generate soliton pulses with low repetition rate. Unlike with previously reported configurations, we introduce a Faraday mirror after the first half of the cavity length to counteract the nonlinear polarization rotation effects. The total cavity length is 437 m including a 400-m long twisted SMF-28 fiber. The fiber was twisted to cancel the linear birefringence and to ensure that the polarization ellipticity is not altered as the pulse travels along the fiber. The strict control of polarization yields a stable relation between the polarization state of the pulses propagating in the cavity and the regimes of generation. Depending on the polarization state we observed three different emission regimes, the single soliton regime (SR), conventional noise-like pulses (NLP) and noise-like square-waveform pulse (NLSWP). In the SR, a 467.2 kHz train of solitons was obtained with pulse duration of 2.9 ps at 1558.7 nm. IntroductionUltrafast lasers have attracted significant interest due to their potential for applications like surgery [1], high-precision micromachining [2] and multiphoton microscopy (MPM) [3]. In the last case the fiber soliton sources can be especially useful because of their capacity of generating ultrashort pulses in the wavelength range from 1530 nm to 2000 nm using Er, Tm, Ho doped fibers and the effect of soliton self-frequency shift [4]. A high-repetition train of ultrashort pulses causes the effect of thermal accumulation [5,6] which can be beneficial in some cases, however it is undesirable for applications such as MPM. The repetition rate can be reduced by using pulse pickers such as Pockels cells or acousto-optic modulators, however this method is energetically inefficient and increases the complexity of the setup. Because the repetition rate of a mode-locked laser is inversely proportional to its resonator length, the repetition rate can be reduced simply by lengthening the cavity. In contrast to solid-state lasers, which require critical alignment, fiber lasers are more prone to achieve lower repetition rates with the convenience and simplicity of elongating a fiber cavity.The long cavity lasers were studied mainly with the purpose to increase the pulse energy in the configurations with net-normal dispersion. For example, Kobtsev et al. [7]

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Section: Soliton Regime (Sr)supporting

confidence: 90%

Long cavity ring fiber mode-locked laser with decreased net value of nonlinear polarization rotation

Rodríguez-Morales¹,

Armas-Rivera²,

Ibarra-Escamilla³

et al. 2019

Opt. Express

View full text Add to dashboard Cite

show abstract

“…Worth noticing is the fact that under high pump powers no signs of pulse braking, noise-like or higher harmonic operation were observed [28]. The linearity of graph Fig.…”

Section: Resultsmentioning

confidence: 98%

Dissipative soliton resonances in all-fiber Er-Yb double clad figure-8 laser

Krzempek¹

2015

Opt. Express

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First demonstration of exploiting Dissipative Soliton Resonance (DSR) effects for generating high energy square-shaped pulses in an all-fiber mode-locked Double Clad (DC) erbium-ytterbium (Er-Yb) figure-8 laser (F8L) is presented. The laser was capable of generating 170 ns pulses with an average power of 1.7 W at 800 kHz repetition rate, which corresponds to a record pulse energy of 2.13 μJ, achieved directly from the resonator, without Q-switching, cavity dumping or additional amplifiers. Unique circulator-based out-coupling of high energy pulses in the directional loop is proposed as a method of preventing damage to the all-fiber setup. Appropriate laser design allowed utilizing Peak Power Clamping (PPC) effect for linear pulse duration tuning via changing the pump power.

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“…Even if sharing similar pulse shape, the noise-like square wave pulses are quite different from typical DSR pulses. Although a noise-like square wave pulse looks like a single pulse from an oscilloscope with slow responded photodetector, a measurement by using an autocorrelator showed that it contained some fine structures on the square long envelop [37].…”

Section: Introductionmentioning

confidence: 99%

Tunable and switchable harmonic h-shaped pulse generation in a 303 km ultralong mode-locked thulium-doped fiber laser

Zhao

et al. 2019

Photon. Res.

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We experimentally demonstrated a type of tunable and switchable harmonic h-shaped pulse generation in a thulium-doped fiber (TDF) laser passively mode-locked by using an ultra-long nonlinear optical loop mirror (NOLM). The total cavity length was ~3.03 km, the longest ever built for a TDF laser to our best knowledge, which resulted in an ultra-large anomalous dispersion over -200 ps 2 around the emission wavelength. The produced hshaped pulse could operate either in a fundamental or in a high-order harmonic mode-locking (HML) state depending on pump power and intra-cavity polarization state (PS). The pulse duration, no matter of the operation state, was tunable with pump power. However, pulse breaking and self-organizing occurred, resulting in high order HML, when the pump power increased above a threshold. At a fixed pump power, the order of HML was switchable from one to another by manipulating the PS. Switching from 8 th up to 48 th order of HML was achieved with a fixed pump power of ~4.15 W. Our results revealed the detailed evolution and switching characteristics of the HML and individual pulse envelope with respect to both the pump power and PS. We have also discussed in detail on the mechanisms of both the h-shaped pulse generation and the switching of its HML. This contribution would be helpful for further in-depth study on the underlain dynamics of long duration, particular-envelope pulses with ultra-large anomalous dispersion and ultra-long roundtrip time.

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Generation and evolution of mode-locked noise-like square-wave pulses in a large-anomalous-dispersion Er-doped ring fiber laser

Cited by 135 publications

References 24 publications

Long cavity ring fiber mode-locked laser with decreased net value of nonlinear polarization rotation

Long cavity ring fiber mode-locked laser with decreased net value of nonlinear polarization rotation

Dissipative soliton resonances in all-fiber Er-Yb double clad figure-8 laser

Tunable and switchable harmonic h-shaped pulse generation in a 303 km ultralong mode-locked thulium-doped fiber laser

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