Mid-IR tunable CW and passively Q-switched laser operation of Dy-doped fluoride fiber

We report a comprehensive characterization of tunable continuous-wave (CW) and passive Q-switching laser performance of Dy-doped zirconium fluoride fiber emitting around 3 µm. The in-band pumped CW laser operation is investigated for pump wavelengths varying from 2.7 µm to 2.825 µm, for fiber length...

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Bibliographic Details
Published in:Optical materials express 2022-04, Vol.12 (4), p.1502
Main Authors: Wang, Yuchen, Fernandez, Toney T., Tang, Pinghua, Coluccelli, Nicola, Jackson, Stuart D., Falconi, Mario C., Prudenzano, Francesco, Laporta, Paolo, Galzerano, Gianluca
Format: Article
Language:English
Subjects:
Continuous radiation
Fluorides
Lasers
Pulse duration
Q switched lasers
Zirconium
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Summary:We report a comprehensive characterization of tunable continuous-wave (CW) and passive Q-switching laser performance of Dy-doped zirconium fluoride fiber emitting around 3 µm. The in-band pumped CW laser operation is investigated for pump wavelengths varying from 2.7 µm to 2.825 µm, for fiber lengths ranging from 0.4 m to 2 m, and for output coupling efficiency from 10% to 50%, leading to a maximum laser slope efficiency of 44% and a tuning range larger than 300 nm. With Findlay-Clay analysis and Rigrod analyses, optimal cavity parameters are retrieved, paving the way for further optimizations in performance. The passively Q-switched laser operation of Dy-doped fluoride fiber is achieved employing a semiconductor saturable absorber mirror for the first time, demonstrating a stable operation with a minimum pulse duration of 580 ns, a highest repetition frequency of 103 kHz and a pulse energy up to 300 nJ.
ISSN:2159-3930
2159-3930
DOI:10.1364/OME.453046