首页|Observation of Laser Cooling on an Electric-Dipole-Allowed Transition in Cr~(3+):LiSAF Crystal

Observation of Laser Cooling on an Electric-Dipole-Allowed Transition in Cr~(3+):LiSAF Crystal

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  • Wiley
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, λ_(exc), of 1 μm in an unoriented 1% Cr~(3+):LiSAF, which has an average emission wavelength, (λ_(em)), 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 ∼ (λ_(exc) − (λ_(em)))∕(λ_(em)) ∼ 20% 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.

anti-stokes fluorescenceCr3+:LiSAFelectric dipole allowed transitionsoptical refrigerationthermal lens spectroscopy

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

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Programa de Pos-Graduacao em Recursos Naturais Universidade Estadual de Mato Grosso do Sul Dourados, MS 79804-970, Brazil

Departamento de Fisica Universidade Estadual de Maringa Maringa, PR 87020-900, Brazil

Instituto de Fisica de SaoCarlos Universidade de Sao Paulo IFSC-USP SaoCarlos, SP 13566–590, Brazil

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

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2025

10.1002/adom.202403222

Advanced Optical Materials

Advanced Optical Materials

ISSN：2195-1071
年,卷(期)：2025.13(16)
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