Abstract

The regime of dissipative solitons (DS) is a powerful technique for generating high-energy femtosecond pulses in mode-locked lasers based on fiber or other solid-state media [1,2]. Chirped DS pulses are formed inside the laser cavity due to a balanced action of nonlinearity and dispersion (normal), gain and loss. Being intrinsically one-dimensional, stable and hands-free, all-fiber design of femtosecond oscillators is one of the most attractive technologies being intensively developed recently. A key task for the researchers formulated for DS-based all-fiber oscillators is their pulse energy scalability. As shown recently, the DS energy can be increased up to stimulated Raman scattering (SRS) threshold [3,4], achieved for special cavity designs based on a long PM fiber. It was shown that SRS effect converting the excess energy of DS to the noisy Raman pulse at Stokes-shifted wavelengths not necessarily destabilizes the DS [5]. Further development of this idea demonstrated that an intracavity feedback provided by re-injection of the Raman pulse into the laser cavity with proper timing may lead to formation of a coherent Raman dissipative soliton (RDS) [6]. Together, DS and RDS (and second-order RDS) form a two (three) -color complex (see Fig.1.a) of higher total energy.

© 2015 IEEE

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