Stable and unstable Nozaki-Bekki holes in a long laser

Uday Gowda; Svetlana Slepneva; Alexander Pimenov; Andrei Vladimirov; Evgeny Viktorov; Guillaume Huyet

doi:10.1117/12.2510300

26 February 2019 Stable and unstable Nozaki-Bekki holes in a long laser

Uday Gowda, Svetlana Slepneva, Alexander Pimenov, Andrei Vladimirov, Evgeny Viktorov, Guillaume Huyet

Proceedings Volume 10912, Physics and Simulation of Optoelectronic Devices XXVII; 109120M (2019) https://doi.org/10.1117/12.2510300
Event: SPIE OPTO, 2019, San Francisco, California, United States

Abstract

Long cavity fibre-based wavelength sweeping lasers are promising devices with a wide range of potential applications ranging from communications to life sciences. For example, Fourier Domain Mode-Locked (FDML) lasers, which are commonly used for Optical Coherence Tomography (OCT) imaging applications are long cavity lasers incorporating an intra-cavity resonator driven in resonance with the cavity round trip time. The coherence properties of such swept sources are of major importance as they define the image quality. The purpose of this work is to analyze the mechanism that deteriorates the coherence of long lasers. In our experiment, the laser included a 100nm wide semiconductor optical amplifier at 1310nm and a fibre cavity that could vary from 20m to 20km. the laser emission wavelength was controlled using a fibre based intra-cavity filter with a bandwidth of 10GHz. Near the lasing threshold and/or for fast carrier decay rate, we observed the appearance of periodic power dropouts with stable Nozaki-Bekki holes (NBH) that circulate in the laser cavity. As a function of the injection current, the laser could operate in various regimes including bi-stability between NBH and stable (cw) operation, unstable NBH or chaotic operation. Such behavior indicates that the interplay between the injection current and carrier decay rate can lead to highly coherent emission of a long cavity laser.

Citation Download Citation

Uday Gowda, Svetlana Slepneva, Alexander Pimenov, Andrei Vladimirov, Evgeny Viktorov, and Guillaume Huyet "Stable and unstable Nozaki-Bekki holes in a long laser", Proc. SPIE 10912, Physics and Simulation of Optoelectronic Devices XXVII, 109120M (26 February 2019); https://doi.org/10.1117/12.2510300

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KEYWORDS

Laser resonators

Laser applications

Tunable lasers

Optical filters

Semiconductor lasers

Semiconductor optical amplifiers

Optical coherence tomography

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