Abstract

The possibility of using optical Localized States (LSs) in resonators to code and process information bits has attracted a great deal of attention in the last twenty years [1]. LSs are stable solutions of dissipative systems characterized by a correlation range much shorter than the size of the hosting system. Temporal LSs (TLSs) have been recently reported in passively mode-locked (PML) semiconductor lasers [2]. It was shown that for cavity round-trip τ larger than the gain recovery τg and for large modulation of the losses induced by the absorber, several pulsating states with different number of pulses coexist for the same parameter values. In this multistable regime mode-locked pulses become localized, i.e. they can be addressed individually [3]. This was implemented in an electrically-pumped broad-area Vertical-Cavity Surface-Emitting Laser (VCSEL) coupled to a resonant semiconductor saturable absorber mirror (SESAM). VCSEL far-field transverse profile was imaged onto the SESAM in a self-collimating scheme for achieving stable mode-locking regime [4]. Though this peculiar scheme allowed efficient saturation of the SESAM, it also induced global coupling of the VCSEL’s transverse section.

© 2019 IEEE

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References

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