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Photonics 2018, 5(3), 17; https://doi.org/10.3390/photonics5030017

Bunimovich Stadium-Like Resonator for Randomized Fiber Laser Operation

1
INESC-TEC and Department of Physics and Astronomy, University of Porto, 4169-007 Porto, Portugal
2
IPHT—Leibniz Institute of Photonic Technology, 07745 Jena, Germany
*
Author to whom correspondence should be addressed.
Received: 18 June 2018 / Revised: 11 July 2018 / Accepted: 11 July 2018 / Published: 17 July 2018
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Abstract

A silica resonator was demonstrated for random laser generation. The resonator consisted of a conventional microsphere fabricated in an optical fiber tip through electric arc discharge, and modifications to its geometry were carried out to create asymmetry inside the silica structure. The resulting Bunimovich stadium-like microsphere promotes multiple reflections with the boundaries, following the stochastic properties of dynamic billiards. The interference of the multiple scattered beams generates a random signal whose intensity was increased by sputter-coating the microstadium with a gold thin film. The random signal is amplified using an erbium-doped fiber amplifier (EDFA) in a ring cavity configuration with feedback, and lasing is identified as temporal and spectral random variations of the signal between consecutive measurements. View Full-Text
Keywords: random fiber laser; multiple scattering; Er-doped fiber amplifier; microstadium; Bunimovich stadium; single mode fiber; fusion splicer random fiber laser; multiple scattering; Er-doped fiber amplifier; microstadium; Bunimovich stadium; single mode fiber; fusion splicer
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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MDPI and ACS Style

Silveira, B.; Gomes, A.; Becker, M.; Schneidewind, H.; Frazão, O. Bunimovich Stadium-Like Resonator for Randomized Fiber Laser Operation. Photonics 2018, 5, 17.

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