Abstract

In 1983, Silfvast et al.¹ demonstrated a high gain of 4416-Å cadmium II laser pumped by inner-shell photoionization. We propose an 1850-Å laser on the isoelectronic $4d^{9}5s^2{}^2{D}_{5/2}\to 4d^{10}5s5p^2{P}_{3/2}^{\circ }$ transition in indium III. Our atomic structure calculations indicate near-equal line strengths for the CD II 4416-Å and in in 1850-Å transitions. Our calculated natural lifetime of 80 ns for the In III 4d⁹5s^{2 2}D_5/2 state makes an inner-shell photoionization-pumped laser seem feasible.

© 1985 Optical Society of America