Comparative study of rare-earth doped low-phonon fluoride and chloride crystals for mid-IR laser potential

E. E. Brown; Z. D. Fleischman; J. McKay; U. Hömmerich; S. B. Trivedi; M. Dubinskii

doi:10.1117/12.2587796

12 April 2021 Comparative study of rare-earth doped low-phonon fluoride and chloride crystals for mid-IR laser potential

E. E. Brown, Z. D. Fleischman, J. McKay, U. Hömmerich, S. B. Trivedi, M. Dubinskii

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Proceedings Volume 11724, Laser Technology for Defense and Security XVI; 117240C (2021) https://doi.org/10.1117/12.2587796
Event: SPIE Defense + Commercial Sensing, 2021, Online Only

Abstract

Extending solid-state laser technology to longer wavelengths is difficult because the transitions that lead to mid-IR emission experience strong competition from the multiphonon-relaxation (MPR) which reduces the emission quantum efficiency. In this work, a comparative study of mid-IR (3-5 μm) spectroscopic properties on RE³⁺ ions doped in various low-phonon fluoride and chloride based crystals were explored. Obtained experimental results, including temperature dependent absorption and fluorescence, transition cross-sections, and fluorescence dynamics are discussed and the potential for efficient laser operation is evaluated. Ultimately, the chloride materials demonstrated more favorable laser parameters than the fluoride materials, including significantly longer upper laser level lifetimes.

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E. E. Brown, Z. D. Fleischman, J. McKay, U. Hömmerich, S. B. Trivedi, and M. Dubinskii "Comparative study of rare-earth doped low-phonon fluoride and chloride crystals for mid-IR laser potential", Proc. SPIE 11724, Laser Technology for Defense and Security XVI, 117240C (12 April 2021); https://doi.org/10.1117/12.2587796

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