Observation of Laser Cooling on an Electric‐Dipole‐Allowed Transition in Cr <sup>3+</sup> :LiSAF Crystal

Abstract In this work, an electric dipole allowed transition in two Cr 3+ :LiSAF samples is investigated for the purpose of optical refrigeration. A cooling efficiency approaching 10% is experimentally determined using a mode‐mismatched dual‐beam thermal lens method with excitation wavelength, , of 1 µm in an unoriented 1% Cr 3+ :LiSAF, which has an average emission wavelength, , of 850 nm. In an oriented 4% Cr 3+ :LiSAF sample, the efficiency reached (but does not exceed) the threshold for cooling when excited with π‐polarized light. These results suggest that Cr 3+ :LiSAF can approach an ideal cooling efficiency ∼ with excitation ≈1µm. Additionally, this analysis indicates that parasitic background absorption rather than upconversion or excited state absorption limits the cooling at higher Cr 3+ concentrations.

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Publication Details

Journal
Advanced Optical Materials
Published
2025-05-27
DOI
https://doi.org/10.1002/adom.202403222
Citations
1
Primary Topic
Optical properties and cooling technologies in crystalline materials
Type
article
Field-Weighted Citation Impact
1.25

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article

Observation of Laser Cooling on an Electric‐Dipole‐Allowed Transition in Cr 3+ :LiSAF Crystal

S.M. Lima, L.H.C. Andrade, T. Catunda, A. C. Bento et al.
1 citations
Advanced Optical Materials
Optical properties and cooling technologies in crystalline materials
1.25
article

Observation of Laser Cooling on an Electric‐Dipole‐Allowed Transition in Cr 3+ :LiSAF Crystal

S.M. Lima, L.H.C. Andrade, T. Catunda, A. C. Bento, J.R. Silva, Stephen C. Rand
article en
1 citations

Abstract

Abstract In this work, an electric dipole allowed transition in two Cr 3+ :LiSAF samples is investigated for the purpose of optical refrigeration. A cooling efficiency approaching 10% is experimentally determined using a mode‐mismatched dual‐beam thermal lens method with excitation wavelength, , of 1 µm in an unoriented 1% Cr 3+ :LiSAF, which has an average emission wavelength, , of 850 nm. In an oriented 4% Cr 3+ :LiSAF sample, the efficiency reached (but does not exceed) the threshold for cooling when excited with π‐polarized light. These results suggest that Cr 3+ :LiSAF can approach an ideal cooling efficiency ∼ with excitation ≈1µm. Additionally, this analysis indicates that parasitic background absorption rather than upconversion or excited state absorption limits the cooling at higher Cr 3+ concentrations.

Advanced Optical MaterialsVol. 13(16)
Universidade Estadual de Maringá (BR), Universidade Federal de São Carlos (BR), Universidade de São Paulo (BR), University of Michigan (US), Universidade Estadual de Mato Grosso do Sul (BR), Michigan Medicine (US), Natura (Brazil) (BR)
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior, Conselho Nacional de Desenvolvimento Científico e Tecnológico, Fundação de Apoio ao Desenvolvimento do Ensino, Ciência e Tecnologia do Estado de Mato Grosso do Sul
Openalex Percentile: Top 21%
Optical properties and cooling technologies in crystalline materials
1.25
DOIOpen Access PDFOpenAlex
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Observation of Laser Cooling on an Electric‐Dipole‐Allowed Transition in Cr <sup>3+</sup> :LiSAF Crystal — S.M. Lima, L.H.C. Andrade, et al. · Advanced Optical Materials (2025) | TGRS Research Map | TGRS