Abstract

We report the first room-temperature pulsed lasing around 2.4 ?m from the single-crystalline Cr<sup>2+</sup>:ZnSe powder active medium with particle sizes varying from hundreds of nanometers to micrometers. Pump energy density at laser threshold of ~34 mJ/cm<sup>2</sup> has been observed.

© 2004 Optical Society of America

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