Technical Publication Visuel
Life Science

Diode-Pumped Deep-Red (717 nm) Double-Clad Praseodymium Fiber Laser

Authors: Esrom Kifle, Pavel Loiko, Laurine Bodin, Franck Joulain, Thibaud Berthelot, Samuel Poulain, Gilles Recoque, Florence Pau, Thierry Georges, Patrice Camy
Published in: Advanced Solid State Lasers, ATu5A. 7
Date: 2022

Oxxius deep-red laser sources today

Presented at the Advanced Solid State Lasers (ASSL) conference in 2022, this paper reports a watt-class deep-red fiber laser at 716.7 nm based on a Pr³⁺-doped ZBLAN double-clad fiber pumped by a 442 nm GaN diode — a pump wavelength within the range covered by Oxxius’s own high-brightness blue laser diode modules. The 9.0% slope efficiency demonstrated here represents a significant step in making deep-red ZBLAN fiber lasers practical for instrument integration.

The 717 nm wavelength falls in a spectral region of growing interest for life science imaging, particularly for fluorophores excited in the deep-red range and for applications benefiting from reduced tissue scattering compared to visible wavelengths. This research is part of a broader collaborative effort involving Oxxius and academic partners to develop compact visible and deep-red fiber laser sources pumped by GaN diodes. Oxxius’s LBX-442 and related high-brightness blue diode modules serve as the pump source enabling this class of fiber laser architectures.

Abstract

We report on a deep-red fiber laser delivering 0.71 W at 716.7 nm with a slope efficiency of 9.0%. It is based on a Pr 3+-doped ZBLAN double-clad fiber pumped by a 442-nm GaN diode.

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