Laser cooling with optical temperature sensing in Er3+-doped tellurite-germanate glasses

• Published in: Applied physics. B, Lasers and optics Vol. 110; no. 4; pp. 471 - 476
• Main Authors: Sui, G. Z., Li, X. P., Cheng, L. H., Zhang, J. S., Sun, J. S., Zhong, H. Y., Tian, Y., Fu, S. B., Chen, B. J.
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer-Verlag 01-03-2013
• Subjects: Cooling; Detection; Engineering; Excitation spectra; Glass; Inspection; Lasers; Optical Devices; Optics; Photonics; Physical Chemistry; Physics; Physics and Astronomy; Quantum Optics; Spectra; Spectral emissivity; GeO2; Fluorescence Intensity Ratio; Excited State; Green Emission; Laser Cool
• ISSN: 0946-2171; 1432-0649
• DOI: 10.1007/s00340-012-5281-5

A novel optical cooling route based on anti-Stokes fluorescence of
2
H
11/2
state in Er
3+
-doped materials was proposed. The target temperature of the cooled solid could be monitored simultaneously via spectral inspection of the two green emissions from
2
H
11/2
and
4
S
3/2
excited states of Er
3+
. Here Er
3+
-doped tellurite-germanate glasses with various compositions were prepared. The temperature sensing properties and cooling abilities were systematically analyzed. It was found that all of the samples exhibit good temperature sensing performance and the net cooling could be achieved by properly choosing host materials and pumping wavelength estimated by the spectral measurements.