Spectroscopy and 2.8 µm laser operation of disordered Er:CLNGG crystals

Author:

Normani Simone,Loiko Pavel,Pan Zhongben1ORCID,Dunina Elena2,Fomicheva Liudmila3,Kornienko Alexey2,Braud Alain,Chen Weidong4ORCID,Griebner Uwe4,Petrov Valentin4ORCID,Camy Patrice

Affiliation:

1. Shandong University

2. Vitebsk State Technological University

3. Belarusian State University of Informatics and Radioelectronics

4. Max Born Institute for Nonlinear Optics and Short Pulse Spectroscopy

Abstract

We report on the first, to the best of our knowledge, laser operation on the 4I11/2 → 4I13/2 transition of erbium-doped disordered calcium lithium niobium gallium garnet (CLNGG) crystals with broadband mid-infrared emission properties. A 41.4 at.% Er:CLNGG continuous-wave laser generated 292 mW at 2.80 µm with 23.3% slope efficiency and a laser threshold of 209 mW. Er3+ ions in CLNGG feature inhomogeneously broadened spectral bands (σSE = 1.79 × 10−21 cm2 at 2.79 µm; emission bandwidth, 27.5 nm), a large luminescence branching ratio for the 4I11/2 → 4I13/2 transition of 17.9%, and a favorable ratio of the 4I11/2 and 4I13/2 lifetimes, exhibiting values of 0.34 ms and 1.17 ms (for 41.4 at.% Er3+), respectively.

Funder

Agence Nationale de la Recherche

Région Normandie

European Regional Development Fund

Contrat de plan État-Région (CPER) de Normandie

National Natural Science Foundation of China

Qilu Young Scholar Program of Shandong University

Publisher

Optica Publishing Group

Subject

Atomic and Molecular Physics, and Optics

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