Spontaneous temperature and fluorescence oscillations in CaS:Eu2+ crystals excited in the long-wavelength tail of the absorption spectrum

The electric dipole allowed 4f65d1–f7 fluorescence of CaS:Eu2+ crystals was studied under excitation in the long-wavelength tail of the absorption spectrum (the regime typical for laser cooling experiments). Though no actual cooling was detected, spectra with a strong anti-Stokes component were obse...

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Bibliographic Details
Published in:Journal of luminescence 2016-02, Vol.170, p.121-126
Main Authors: Feofilov, S.P., Kulinkin, A.B.
Format: Article
Language:English
Subjects:
Electron–phonon fluorescence bands
Eu2
Laser cooling
Optical bistability
Relaxation oscillations
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Summary:The electric dipole allowed 4f65d1–f7 fluorescence of CaS:Eu2+ crystals was studied under excitation in the long-wavelength tail of the absorption spectrum (the regime typical for laser cooling experiments). Though no actual cooling was detected, spectra with a strong anti-Stokes component were observed which demonstrate the possibility to employ electron–phonon bands of electric dipole allowed transitions for optical refrigeration. Under the strong laser excitation, the heating of thermally-isolated crystals was observed accompanied by optical bistability and spontaneous fluorescence oscillations. These unusual effects in fluorescence are ascribed to strong nonlinearities existing in the system.
ISSN:0022-2313
1872-7883
DOI:10.1016/j.jlumin.2015.09.008