Parity-Time symmetry in lasers with nonuniform and segmented gain

Darayas N. Patel; Sergey S. Sarkisov; Abdalla M. Darwish; Aminaa Jallow; Kaiana Lewis; Dedrian Barrett; Andrew Dholichand; Mike Warren Jr.; Kayla McEady

doi:10.1117/12.2576994

5 March 2021 Parity-Time symmetry in lasers with nonuniform and segmented gain

Darayas N. Patel, Sergey S. Sarkisov, Abdalla M. Darwish, Aminaa Jallow, Kaiana Lewis, Dedrian Barrett, Andrew Dholichand, Mike Warren Jr., Kayla McEady

Author Affiliations +

Proceedings Volume 11687, Oxide-based Materials and Devices XII; 1168725 (2021) https://doi.org/10.1117/12.2576994
Event: SPIE OPTO, 2021, Online Only

Conference Poster

Abstract

It has been a strong interest in the laser systems with segmented gain/loss with PT-symmetry properties. This paper shows that a fiber laser pumped from one end with a depleting pump meets the conditions of PT-symmetry in the vicinity of the turning point where the gain becomes equal to the loss. The real component of the square of the complex refractive index is symmetric with respect to the turning point while the imaginary part is anti-symmetric. When the gain grows, the laser becomes segmented into two regions with dominating gain or loss. The turning point starts moving towards the other end of the laser. It leads to the appearance, in addition to the laser mode evenly distributed over the entire laser cavity, of a mode that is pushed in the lossy region. The frequency of that mode is in resonance with the length of the lossy region. The experimental data for a 15-m long Erbium doped fiber laser correlated with such hypothesis. We also built a nanocolloid capillary optical amplifier using synthesized phosphor NaY_0.83 F₄: Yb³⁺ _0.14, Er³⁺ _0.03. The effect of upconversion emission in such amplifier leads to an additional channel for the pump depletion. This potentially can cause even stronger PT-symmetry effects in a laser based on such optical amplifier.

Conference Presentation

Citation Download Citation

Darayas N. Patel, Sergey S. Sarkisov, Abdalla M. Darwish, Aminaa Jallow, Kaiana Lewis, Dedrian Barrett, Andrew Dholichand, Mike Warren Jr., and Kayla McEady "Parity-Time symmetry in lasers with nonuniform and segmented gain", Proc. SPIE 11687, Oxide-based Materials and Devices XII, 1168725 (5 March 2021); https://doi.org/10.1117/12.2576994

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