Title :
Blue, green and yellow upconversion lasing in Er:YLiF4 using 1.5 mu m pumping
Author :
Macfarlane, R.M. ; Whittaker, E.A. ; Lenth, W.
Author_Institution :
Almaden Res. Lab., IBM Res. Div., San Jose, CA, USA
Abstract :
The authors report blue, green and yellow upconversion laser action in Er3+:YLiF4 following pumping at 1.500 mu m below 80 K. For the blue transition the ratio of the output frequency to the input frequency is 3.3, the highest yet reported for an upconversion laser. In spite of the multiple upconversion steps, the thresholds for laser action were less than 80 mW. It is proposed that the nonlinear upconversion pumping proceeds via a sequence of several pairwise cross-relaxation steps.
Keywords :
erbium; optical frequency conversion; optical pumping; solid lasers; 1.5 micron; Er:YLiF 4; YLiF 4:Er; blue transition; green upconversion lasing; laser action thresholds; multiple upconversion steps; nonlinear upconversion pumping; output frequency input frequency ratio; pairwise cross-relaxation steps; yellow upconversion lasing;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:19921371
