Journal
OPTICAL MATERIALS
Volume 95, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.optmat.2019.109195
Keywords
Solid-state laser cooling; Optical refrigeration; Thermal lens spectroscopy; Yb-3(+):YLF; Ce-3(+):YAG
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Funding
- Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico
- Fundacao de Apoio ao Desenvolvimento do Ensino, Ciencia e Tecnologia do Estado de Mato Grosso do Sul (FUNDECT) [59/300.031/2015, 23/200.735/2014]
- Air Force Office of Scientific Research [FA9550-16-1-0362]
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In this work Thermal Lens Spectroscopy (TLS) is used for sensitive characterization of absorption in optical materials with particular application for solid-state laser cooling (optical refrigeration). TLS is used to characterize key parameters involved in 4f-4f transition in Yb3+ :YLF and 4f-5d transition in Ce3+:YAG systems. The results confirm the excellent laser cooling results found in previous works on Yb-3+( ):YLF crystal. In addition, although no cooling effect was observed in Ce3+:YAG sample, the TLS showed that this material exhibits promising characteristics towards laser cooling applications, such as high external quantum efficiency ( > 92%), and low parasitic background absorption of (1.2 +/- 0.2) x 10(-4) cm(-1) at 885 nm. The key mechanisms that appear to inhibit net cooling in Ce3+:YAG are attributed to the intrinsic excited state absorption and/or 4f-4f transitions between the two lowest levels of Ce3+. This investigation was turned possible due to the high sensitivity of TLS for very low absorptions.
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