We studied the lasing and spectroscopic properties of erbium in yttrium aluminum garnet, both as a single impurity and when codoped with neodymium or holmium. In all cases, we observed lasing at 2.936 and 2.939 μm; when erbium was codoped with holmium, we also observed lasing at 2.795 and 2.766 μm. (This is in contrast to (Er,Nd):YAlO3, which lased only on one line, 2.73 μm.) By determining the energy-level splitting implied by the four observed laser lines, and combining this with transmission spectroscopy, we were able to assign unambiguous values to the Stark sublevels of the three lowest energy levels of Er3+ in YAG at room temperature.
© 1990 Optical Society of AmericaPDF Article
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