The present investigation explores the upconversion properties of Er³⁺- doped La₂O₂S crystal powder as well as its potentiality for anti-Stokes cooling. A detailed study of the wavelength and pumping power dependence of the spectroscopic properties and of the temperature field of samples with various erbium concentrations is presented. The analysis of both spectroscopic and thermal measurements shows that after a transient heating induced by the background absorption, cooling can be attained by means of anti-Stokes processes.

Date Published: 10 March 2015
PDF: 10 pages
Proc. SPIE 9380, Laser Refrigeration of Solids VIII, 93800A (10 March 2015); doi: 10.1117/12.2076963

Published in SPIE Proceedings Vol. 9380:
Laser Refrigeration of Solids VIII
Richard I. Epstein; Denis V. Seletskiy; Mansoor Sheik-Bahae, Editor(s)