Yb3+-doped Gd3Ga5O12 garnet single crystals grown by the micro-pulling down technique for laser application. Part 2: Concentration quenching analysis and laser optimization

✍ Scribed by Y. Guyot; H. Canibano; C. Goutaudier; A. Novoselov; A. Yoshikawa; T. Fukuda; G. Boulon

• Publisher: Elsevier Science
• Year: 2006
• Tongue: English
• Weight: 397 KB
• Volume: 28
• Category: Article
• ISSN: 0925-3467
• DOI: 10.1016/j.optmat.2004.10.026

✦ Synopsis

This article is following the first part published recently in this journal [S. Che ´nais, F. Druon, F. Balembois, P. Georges, A. Brenier, G. Boulon, Opt. Mater. 22 (2003) 99]. Yb 3+ concentration dependence of the 2 F 5/2 excited level experimental decay time in GGG laser crystal was analyzed in order to understand involved concentration quenching mechanisms. Under Yb 3+ ion infrared pumping, selftrapping and up-conversion non-radiative energy transfer to rare earth impurities (Er 3+ , Tm 3+ ) have been observed in visible region and interpreted by a limited diffusion process within the Yb 3+ doping ion subsystem towards impurities. OH À quenching centres, Yb 2+ ions and color centres may also be involved in such processes but Yb 3+ pairs do not seem efficient. Main parameters useful for the optimization of laser potentiality have also been given from a new model which has been published recently.