Megawatt peak power from a Mamyshev oscillator

Liu, Zhanwei; Ziegler, Zachary M.; Wright, Logan G.; Wise, Frank W.

doi:10.1364/optica.4.000649

Cited by 160 publications

(91 citation statements)

References 37 publications

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“…Investigation of the noise properties of GMN amplifiers will be a subject of future work that may open a way for noise reduction in fiber amplifiers. Numerical simulations ( Supplementary Information S4) show that the GMN regime underlies the pulse evolution in recently-developed high-performance fiber oscillators 33,34 . We anticipate that a better understanding of the nature of the nonlinear attractor in the GMN regime will significantly advance the design and optimization of such oscillators.…”

Section: Discussionmentioning

confidence: 99%

Nonlinear ultrafast fiber amplifiers beyond the gain-narrowing limit

Sidorenko

Wise

2019

Optica

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Ultrafast lasers are becoming increasingly widespread in science and industry alike. Fiberbased ultrafast laser sources are especially attractive because of their compactness, alignment-free setups, and potentially low costs. However, confining short pulses within a fiber core leads to high intensities, which drive a host of nonlinear effects. While these phenomena and their interactions greatly complicate the design of such systems, they can also provide opportunities for engineering new capabilities. Here, we report a new fiber amplification regime distinguished by the use of a dynamically-evolving gain spectrum as a degree of freedom: as a pulse experiences nonlinear spectral broadening, absorption and amplification actively reshape both the pulse and the gain spectrum itself. The dynamic coevolution of the field and excited-state populations supports pulses that can broaden spectrally by almost two orders of magnitude and well beyond the gain bandwidth, while remaining cleanly-compressible to their sub-50-fs transform limit. Theory and experiments provide evidence that a nonlinear attractor underlies the management of the nonlinearity by the gain. Further research into the mutual, pulse-inversion propagation dynamics may address open scientific questions and pave the way toward simple, compact fiber sources that produce high-energy, sub-30-fs pulses.

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Section: Discussionmentioning

confidence: 99%

Nonlinear ultrafast fiber amplifiers beyond the gain-narrowing limit

Sidorenko

Wise

2019

Optica

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“…A Gaussian pulse with an energy of 11 pJ and a duration of 5 ps is used as the initial condition in the simulation to ignite the mode-locking process. Such seed pulse is comparable to what has been used in the fiber platform [8] and it can be easily generated by electronically modulating laser diode through gain switching [27] or electro-optic modulation [28,29]. By solving the Eqs.…”

Section: Numerical Resultsmentioning

confidence: 99%

“…Much effort has been made to pursue mode-locked pulses with ever larger pulse energy, shorter pulse duration and higher stability [4][5][6]. Recently a new modelocked fiber laser design, Mamyshev oscillator, has been revisited and superior performance has been demonstrated [7,8]. To sustain the mode locking status in Mamyshev oscillator, the necessary ingredients are the spectral broadening (or shifting), two spectrally shifted bandpass filters, and high laser gain to compensate for the filter loss.…”

Section: Introductionmentioning

confidence: 99%

Solid-state Mamyshev oscillator

2019

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We present the first design and analysis of a solid-state Mamyshev oscillator. We utilize the phase-mismatched cascaded quadratic nonlinear process in periodically poled lithium niobite waveguide to generate substantial spectral broadening for Mamyshev modelocking. The extensive spectral broadening bridges the two narrowband gain media in the two arms of the same cavity, leading to a broadband mode-locking not attainable with either gain medium alone. Two pulses are coupled out of the cavity and each of the output pulses carries a pulse energy of 25.3 nJ at a repetition rate of 100 MHz. The 10-dB bandwidth of 2.1 THz supports a transform limited pulse duration of 322 fs, more than 5 times shorter than what can be achieved with either gain medium alone. Finally, effects of group velocity mismatch, group velocity dispersion, and nonlinear saturation on the performance of Mamyshev mode-locking are numerically discussed in detail.

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“…The present approach has been discussed in the context of dispersionless passive propagation, but its extension to include gain or loss is straightforward. Our approach can also help better understand qualitatively the genesis of peculiar spectrum shapes of laser pulses, such as the batman ear spectra observed in all-normal dispersion lasers [33] or Mamyshev oscillators [34]. While the present discussion focuses on SPM, the concept can also be applied to other nonlinear modulations of the phase of a pulse, such as the modulation generated by cross-phase modulation [35] or an external modulator [36][37][38].…”

Section: Discussionmentioning

confidence: 99%

Simple guidelines to predict self-phase modulation patterns

2018

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We present a simple approach to predict the main features of optical spectra affected by self-phase modulation (SPM), which is based on regarding the spectrum modification as an interference effect. A two-wave interference model is found sufficient to describe the SPM-broadened spectra of initially transform-limited or up-chirped pulses, whereas a third wave should be included in the model for initially down-chirped pulses. Simple analytical formulae are derived, which accurately predict the positions of the outermost peaks of the spectra.

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Megawatt peak power from a Mamyshev oscillator

Cited by 160 publications

References 37 publications

Nonlinear ultrafast fiber amplifiers beyond the gain-narrowing limit

Nonlinear ultrafast fiber amplifiers beyond the gain-narrowing limit

Solid-state Mamyshev oscillator

Simple guidelines to predict self-phase modulation patterns

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