An efficient double-pulse Ho:Tm:YLF 2-µm laser with total Q -switched output energy of 600 mJ has been demonstrated. A double-pulse pair is obtained per pump pulse. By operation of the laser in a double-pulse format, the residual energy stored among the Tm ions is transferred to the Ho atoms that were de-excited by the extraction of the first Q -switched pulse. Thus, the overall laser efficiency is increased by 61%.
© 2003 Optical Society of America
Jirong Yu, Alain Braud, and Mulugeta Petros, "600-mJ, double-pulse 2- µm laser," Opt. Lett. 28, 540-542 (2003)