Abstract
The general characteristics of the ‘photon-avalanche’ up-conversion process are presented. The Pr,Yb system was spectroscopically investigated in Pr;Yb:YLiF 4 and Pr,Yb:YAlO 3 with respect to the realization and understanding of this process. Whereas Pr;Yb:YLiF 4 exhibits an avalanche-type excitation mechanism under infrared pumping, no such behavior is observed for Pr,Yb:YAlO 3. A time dependent rate equation model was developed to describe these different behaviors using experimentally determined parameters. The absence of an avalanche-type excitation mechanism in Pr,Yb:YAlO 3 is mainly caused by (i) a better spectral overlap between the excited state absorption in the Pr and the ground state absorption of Yb, (ii) higher transfer rates between Yb and Pr and within the Pr, and (iii) lower intrinsic decay rates from the participating excited energy levels ( 3P 0,1,2 and 1G 4).
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
