In the past few years, the phenomenon of stepwise upconconversion in Er-activated materials has been of considerable interest to researchers in the solid state laser community. The Impetus of this interest is an efficient laser operating in the wavelength range of 3 µm. A number of researchers have examined the upconversion processes in Er in various materials.1–5 The importance of upconversion has also been demonstrated in actual lasers in quasi-cw operations.2,3,5

© 1989 Optical Society of America

PDF Article


You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
Login to access OSA Member Subscription