208-W average-power TEM<sub>00</sub> -mode operation from a diode-pumped Nd:YAG rod laser was demonstrated. The side-pumping method of generating a high-gain aberration-free rod, the bifocusing-compensation technique with two identically pumped rods, and a suitable choice of beam spot size were employed in the design of this laser. At the maximum pump power of 1.1 kW the fundamental transverse-mode operation (<i>M</i><sup>2</sup><1.1) was characterized by 7.6% electrical efficiency. The extraction efficiency was almost 60% of full multimode operation. Stable operation was obtained within a pump-power range of 15% of the maximum pump power.
© 1999 Optical Society of America
Y. Hirano, Y. Koyata, S. Yamamoto, K. Kasahara, and T. Tajime, "208-W TEM00 operation of a diode-pumped Nd:YAG rod laser," Opt. Lett. 24, 679-681 (1999)