Unravelling Saturable Absorption of Thulium-doped Fibres for New Level of Integrated Femtosecond Pulse Generation

Kirsch, Dennis C.; Cadier, Benoît; Robin, Thierry; Chernysheva, Maria G.

doi:10.48550/arxiv.2202.11370

Cited by 1 publication

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“…Further, to confirm pulse formation due to saturable absorption in the Tm-doped gain fibre and to assess the influence of the laser operation wavelength, we have investigated the power-dependent absorption at various wavelengths within the tuneability range from 1880 to 1947 mW. In our separate detailed studies of the nature of self-mode-locking, we have confirmed that only the unexcited rare part of fibre acts as a saturable absorber 46 . Therefore, we used only a 5-cm long fibre section in this study.…”

Section: Laser Characterisationmentioning

confidence: 81%

“…Particularly, the model considered standard silica glass matrix doped with Tm 3+ ions. Whereas in the experiment, the Tm-doped fibre has a more complicated glass composition 46 , including fluorine and phosphorous, which shifts the Tm 3+ emission spectrum. Still, the numerical investigations have proved that in our case the tuneability range can not be enhanced by implementing a higher gain factor, for instance, by application of Tm-doped fibres with higher doping concentration.…”

Section: Discussionmentioning

confidence: 97%

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Gain-controlled Broadband Tuneability in Self-Mode-locked Thulium-doped Fibre Laser Through Variable Feedback

Kirsch

Bednyakova

Cadier³

et al. 2022

Preprint

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Broadband wavelength tuneability can ensure a new level of versatility for laser systems and extend areas of their applications. Principle limitations of achieving wide tuning wavelength ranges are generally defined by the spectral bandwidth of the gain and traditional tuneability techniques, relying on electrically controlled or bulk filters, reducing laser efficiency and generation stability. In this work, we present nearly 90 nm tuneability in ultrafast Tm-doped fibre laser within the span from 1873 to 1962 nm by implementing variable feedback for efficient control of the excitation level of the active medium and, hence, the gain spectrum. The highest laser efficiency is observed with 20% feedback, while 25% feedback enabled achieving the highest output energy of 1 nJ in 600-fs soliton pulses at 1877 nm central wavelength. By combining the nonlinear Schrödinger equation and population inversion rate equations for the gain medium, the developed numerical model helps to unveil nonlinear pulse evolution under the influence of dynamically varying gain spectrum. The resulting laser system presents a compact and straightforward approach to achieve laser generation with a broad range tuneability of wavelength and operation regimes, which is not impaired by the limitations on laser stability or power performance and can be translated to other wavelength ranges.

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Section: Laser Characterisationmentioning

confidence: 81%

Section: Discussionmentioning

confidence: 97%