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

Author:

Wang Yuchen1ORCID,Fernandez Toney T.2ORCID,Tang Pinghua34,Coluccelli Nicola4ORCID,Jackson Stuart D.2,Falconi Mario C.5,Prudenzano Francesco5ORCID,Laporta Paolo14,Galzerano Gianluca1ORCID

Affiliation:

1. Istituto di Fotonica e Nanotecnologie-CNR

2. Macquarie University

3. Xiangtan University

4. Dipartimento di Fisica-Politecnico di Milano

5. Department of Electrical and Information Engineering

Abstract

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.

Funder

Extreme Light Infrastructure Nuclear Physics

Ministero dell’Istruzione, dell’Università e della Ricerca

China Scholarship Council

Publisher

Optica Publishing Group

Subject

Electronic, Optical and Magnetic Materials

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