DataVXAdvanced Optical MaterialsPaper
journal article·2025-06Open access

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

Junior Reis Silva, Luis Humberto da Cunha Andrade, Sandro Marcio Lima, Antônio Carlos Bento, Tomaz Catunda, Stephen Colby Rand

Advanced Optical Materials· Volume 13· Issue 16
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Source abstract

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.
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Research context

OpenAlex topics: Optical properties and cooling technologies in crystalline materials · Solid State Laser Technologies · Chemical Thermodynamics and Molecular Structure

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Affiliations

Programa de Pós‐Graduação em Recursos Naturais Universidade Estadual de Mato Grosso do Sul Dourados MS 79804‐970 Brazil

Departamento de Física Universidade Estadual de Maringá Maringá PR 87020‐900 Brazil

Instituto de Física de São Carlos Universidade de São Paulo IFSC‐USP São Carlos SP 13566–590 Brazil

Division of Applied Physics University of Michigan Ann Arbor MI 48109 USA

Funding

Fundação de Apoio ao Desenvolvimento do Ensino, Ciência e Tecnologia do Estado de Mato Grosso do Sul · Conselho Nacional de Desenvolvimento Científico e Tecnológico

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