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Megawatt pulses from an all-fiber and self-starting femtosecond oscillator

https://doi.org/10.1364/OL.450313

Haig, Henry; Sidorenko, Pavel; Thorne, Robert; Wise, Frank (February 2022, Optics Letters)

Mamyshev oscillators produce high-performance pulses, but technical and practical issues render them unsuitable for widespread use. Here we present a Mamyshev oscillator with several key design features that enable self-starting operation and unprecedented performance and simplicity from an all-fiber laser. The laser generates 110 nJ pulses that compress to 40 fs and 80 nJ with a grating pair. The pulse energy and duration are both the best achieved by a femtosecond all-fiber laser to date, to our knowledge, and the resulting peak power of 1.5 MW is 20 times higher than that of prior all-fiber, self-starting lasers. The simplicity of the design, ease of use, and pulse performance make this laser an attractive tool for practical applications.
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Direct observations of thermalization to a Rayleigh–Jeans distribution in multimode optical fibres

https://doi.org/10.1038/s41567-022-01579-y

Pourbeyram, Hamed; Sidorenko, Pavel; Wu, Fan O.; Bender, Nicholas; Wright, Logan; Christodoulides, Demetrios N.; Wise, Frank (March 2022, Nature Physics)

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Multimode Mamyshev oscillator

https://doi.org/10.1364/OL.447208

Haig, Henry; Sidorenko, Pavel; Dhar, Anirban; Choudhury, Nilotpal; Sen, Ranjan; Christodoulides, Demetrios; Wise, Frank (December 2021, Optics Letters)

We present a spatiotemporally mode-locked Mamyshev oscillator. A wide variety of multimode mode-locked states, with varying degrees of spatiotemporal coupling, are observed. We find that some control of the modal content of the output beam is possible through the cavity design. Comparison of simulations with experiments indicates that spatiotemporal mode locking (STML) is enabled by nonlinear intermodal interactions and spatial filtering, along with the Mamyshev mechanism. This work represents a first, to the best of our knowledge, exploration of STML in an oscillator with a Mamyshev saturable absorber.
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Dissecting the Mechanisms of Spatiotemporal Mode-Locking

https://doi.org/10.1364/NP.2020.NpTu3D.6

Wright, Logan G.; Sidorenko, Pavel; Pourbeyram, Hamed; Ziegler, Zachary M.; Isichenko, Andrei; Malomed, Boris A.; Menyuk, Curtis R.; Christodoulides, Demetrios N.; Wise, Frank W. (July 2020, OSA Advanced Photonics Conference)
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Mechanisms of spatiotemporal mode-locking

https://doi.org/10.1038/s41567-020-0784-1

Wright, Logan G.; Sidorenko, Pavel; Pourbeyram, Hamed; Ziegler, Zachary M.; Isichenko, Andrei; Malomed, Boris A.; Menyuk, Curtis R.; Christodoulides, Demetrios N.; Wise, Frank W. (May 2020, Nature Physics)

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