Mr. Bryce K. Coyne Profile

Bryce K. Coyne

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Proceedings Article | 21 February 2020 Presentation + Paper

Spectroscopic characterization of Fe:ZnAl2O4, Fe:MgAl2O4 and Fe:InP crystals for mid-IR laser applications

Vladimir Fedorov, Bryce Coyne, Krishna Karki, Stanislav Balabanov, Alexander Belyaev, Viktor Smolski, Shova Subedi, Sergey Mirov

Proceedings Volume 11259, 112591A (2020) https://doi.org/10.1117/12.2546501

KEYWORDS: Crystals, Iron, Absorption, Ions, Mid-IR, Laser crystals, Laser applications, Ceramics, Spectroscopy, Spinel

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There is strong demand for effective gain materials for the 3.0-3.9 μm spectral range not nicely covered by Cr:ZnSe and Fe:ZnSe amplification bands. We characterized, Fe:ZnAl₂O₄ ceramic sample, Fe:MgAl₂O₄ and Fe:InP single crystals as promising laser materials for this mid-IR spectral range. In all crystals, the absorption bands corresponding to ⁵E↔⁵T₂ transition of Fe²⁺ ions in the tetrahedral sites were measured. In addition, absorption band of Fe²⁺ ions in the octahedral sites were observed in Fe:ZnAl₂O₄ sample with maximum absorption cross-section at ~1.0 μm. From the absorption measurements, the radiative lifetime of Fe:MgAl₂O₄ was calculated to be 60 μs. Saturation absorption of Fe²⁺ ions in Fe:ZnAl₂O₄ was studied using Ho:YAG@2.09 μm and Er:YAG@2.94 μm lasers. Saturation measurements were taken up to energy density of 2 J/cm² and showed no saturation of absorption. This can be explained by a fast non-radiative (<100 ps) relaxation time from the ⁵T₂ level of Fe²⁺ ions in the Fe:ZnAl₂O₄ sample at RT. A strong mid-IR photoluminescence (PL) signal in Fe:InP crystal was detected under the direct excitation of the ⁵E↔⁵T₂ transition of Fe²⁺ ions using Er:YAG@2.94 μm laser as well as excitation using photo-ionization process under radiation from Nd:YAG@1.064 μm laser. This indicates that Fe:InP crystals could become promising mid-IR laser media with optimization of fabrication technology.

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