Three key regimes of single pulse generation per round trip of all-normal-dispersion fiber lasers mode-locked with nonlinear polarization rotation

Smirnov, S. V.; Kobtsev, Sergey; Kukarin, S. V.; Ivanenko, Aleksey

doi:10.1364/oe.20.027447

Cited by 154 publications

(105 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…This is not the only possible mechanism for chaotic destabilization of the CPOs. In a number of recent works, fiber lasers operating in net-normal dispersion regimes have demonstrated noise-like and multi-state behavior [5,6,8,9], that was attributed to saturation of the SAM. These systems operated well in the positive dispersion with relatively small TOD, and produced completely different signatures, such as nearly symmetric spectra and bell-shaped autocorrelation traces with a narrow coherence spike at the top, thus allowing clear distinguishing from the To characterize the chaotic regime, we reconstruct the phase-space portrait for the experimental CDS dynamics based on the standard lag-delayed procedure [ Fig.…”

Section: Resultsmentioning

confidence: 99%

“…On top of that, the higher-order dispersion is often unavoidable in broadband systems. As a result, the CPOs are described by a quite complicated multidimensional parameter space; on practice one can often encounter increased amplitude or spectral noise, period multiplication and modulational instability, noise-like and chaotic behaviour [3][4][5][6][7][8][9]. It is important therefore to establish the physical mechanisms, properties, and find practical rules to help recognising such regimes.…”

Section: Introductionmentioning

confidence: 99%

“…We demonstrate that the chaotic mode-locking in a solid-state oscillator results from a parametric resonance with dispersive waves, having different signature and mechanism than observed in the fiber lasers [5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Chaotic chirped-pulse oscillators

Sorokin¹,

Tolstik²,

Калашников³

et al. 2013

Opt. Express

View full text Add to dashboard Cite

Abstract:We present results of experimental investigation of the chaotic and quasi-periodic regime in the chirped-pulsed (dissipative soliton) Cr:ZnS and Cr:ZnSe mid-IR oscillators with significant third-order dispersion. The instability develops when the spectrum edge approaches resonance with a linear wave either due to power increase or by dispersion adjustment. In practice, this occurs when the spectrum edge reaches zero dispersion wavelength. The analysis suggests a three-oscillator chaos model, which is confirmed by numerical simulations. The regime is long-term stable and can be easily overlooked in similar systems. We show that chaotic regime is accompanied by a characteristic spectral shape and can be reliably recognized by using wavelength-skewed filters and by second-harmonic or two-photon absorption detectors.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Chaotic chirped-pulse oscillators

Sorokin¹,

Tolstik²,

Калашников³

et al. 2013

Opt. Express

View full text Add to dashboard Cite

show abstract

“…Furthermore, the NPR allows for fast saturable absorption. Recently, Smirnov et al [18] has demonstrated an allnormal-dispersion mode-locked fiber laser using the NPR technique that can support a large variety of outputs by adjusting the settings of the polarization controller (PC). Different PC settings yield different spectrum energies, durations, shapes, and widths.…”

mentioning

confidence: 99%

Investigation of ellipticity and pump power in a passively mode-locked fiber laser using the nonlinear polarization rotation technique

et al. 2017

View full text Add to dashboard Cite

An elliptical initial polarization state is essential for generating mode-locked pulses using the nonlinear polarization rotation technique. In this work, the relationship between the ellipticity ranges capable of maintaining mode-locked operation against different pump power levels is investigated. An increasing pump power, in conjunction with minor adjustments to the polarization controller's quarter waveplate, results in a wider ellipticity range that can accommodate mode-locked operation. Other parameters such as noise, pulsewidth, and average output power are also observed to vary as the ellipticity changes.OCIS Over the last few years, fiber lasers have become the key focus in the development of new laser applications due to their significant advantages over their solid state counterparts. The key advantages of fiber lasers include their low weight and compact size, as well as relatively lower losses and ease of alignment. These characteristics make fiber lasers a crucial component of today's optical communication, carrying terabits of information across continents. While fiber lasers can be configured to suit multiple applications, pulsed fiber lasers in particular have recently garnered substantial attention in generating high energy pulses. These pulses serve a variety of applications, including communications, sensing, manufacturing, and medicine. Pulsing in fiber lasers can be achieved by multiple active and passive means, with the most common being Q-switching and mode-locking. Of the two, mode-locking is preferred for applications requiring high frequency pulses but at a lower power.Fiber lasers can be mode locked in three ways; either actively, passively, or as a hybrid of both. Active modulation is reliable and offers tunability of various parameters, but generates a broad pulsewidth [1] , and also requires bulky and expensive components. Passive modulation, on the other hand, modulates the loss and gain of the laser using saturable absorbers (SAs) [2][3][4][5] or by inducing SA action, such as nonlinear amplifying loop mirrors (NALMs) [6] and nonlinear polarization rotation (NPR) [7,8]

show abstract

“…We present the phase-transition diagram among different regimes of chaotic emission in terms of the key cavity parameters: amplitude or phase turbulence, and spatio-temporal intermittency. In addition to short-pulse and cw emission regimes, ring fiber lasers used for passive mode locking via nonlinear polarization rotation exhibit the noise-like pulse emission mode of operation [1][2][3][4][5]. The resulting intense pulses have a broadband spectrum and low coherence length, which is of interest for metrology applications such as optical coherence tomography.…”

mentioning

confidence: 99%

Optical turbulence in fiber lasers

Wabnitz

2014

Opt. Lett.

View full text Add to dashboard Cite

We analyze the nonlinear stage of modulation instability in passively mode-locked fiber lasers leading to chaotic or noise-like emission. We present the phase-transition diagram among different regimes of chaotic emission in terms of the key cavity parameters: amplitude or phase turbulence, and spatio-temporal intermittency. In addition to short-pulse and cw emission regimes, ring fiber lasers used for passive mode locking via nonlinear polarization rotation exhibit the noise-like pulse emission mode of operation [1][2][3][4][5]. The resulting intense pulses have a broadband spectrum and low coherence length, which is of interest for metrology applications such as optical coherence tomography. Noise-like or turbulent laser emission may occur with both anomalous or normal cavity dispersion. Switching among various chaotic regimes involving different pulse timescales is obtained by adjusting the intracavity polarization controllers, which must be set away from the condition of minimal polarizer transmissivity for low power signals, so that weak mode-locking results. When operating in the average anomalous dispersion regime, coexistence and interaction of isolated soliton pulses with a chaotic background may lead to complex temporal dynamics involving, e.g., soliton rain and their condensation in liquid, glass, or crystal states [6,7]. In this work we point out that the dynamics of turbulent light emission from fiber lasers with passive mode locking may be analyzed by means of a universal model, namely the complex Ginzburg-Landau equation (CGLE) [8]. This approach permits us to directly relate the key cavity parameters to phase transitions among different regimes of chaotic behavior. Previous studies have been mostly devoted to the stable short-pulse generation regime, where nonlinear gain describes a fast saturable absorber [9][10][11]. In that case, for mode-locked soliton stability, a quintic nonlinear gain saturation term is added to the CGLE [11]. Here we analyze the modulation instability (MI) of cw emission and its associated nonlinear development and consider situations where the intracavity polarization analyzer acts as fast nonlinear gain saturation element. In this case the cubic CGLE is an appropriate minimal model.Light propagation in a fiber laser may be described in the mean field approximation by the CGLE [12]:where t 0 is a continuous slow temporal variable that replaces the round-trip number, τ 0 is a retarded time, E is the complex field envelope defined so that jEj 2 measures optical power, t r is the round-trip time for a cavity of length L, g 0 > 0 is the average distributed power gain in the cavity at the center frequency ω 0 , and T is the amplitude transmission coefficient of the output coupler. Moreover, we approximated the cavity bandwidth limited gain as Gω g 0 1 − 4∕B 2 ω − ω 0 2 , so that β 0 4g 0 ∕B 2 , β 2 is the average group velocity dispersion (GVD), γ 0 ω 0 n 2 ∕cA eff is the nonlinear coefficient of the fiber, n 2 is the nonlinear index, and A eff the effective mode area. Gain b...

show abstract

Three key regimes of single pulse generation per round trip of all-normal-dispersion fiber lasers mode-locked with nonlinear polarization rotation

Cited by 154 publications

References 26 publications

Chaotic chirped-pulse oscillators

Chaotic chirped-pulse oscillators

Investigation of ellipticity and pump power in a passively mode-locked fiber laser using the nonlinear polarization rotation technique

Optical turbulence in fiber lasers

Contact Info

Product

Resources

About