Author Affiliations

N. B. Manson,^1,*** M. Sellars,¹ P. T. H. Fisk,^* and R. S. Meltzer^**

¹Laser Physics Centre, Research School of Physical Sciences and Engineering, Australian National University, Canberra, ACT 2601, Australia.

^*Applied Physics, CSIRO, Lindfield, NSW 2070, Australia.

^**Department of Physics and Astronomy, The University of Georgia, Athens, GA 30602, USA.

^*** nbm111@rsphysse.anu.edu.au