We present what is to our knowledge the first demonstration of a 4.7-W cw Tm:YAG. This proof-of-principle experiment clearly demonstrates the possibility of using a pump absorption that is 2 orders of magnitude (∼0.0078 cm<sup>-1</sup>) less than that of the conventional pump absorption (typically >1 cm<sup>-1</sup>). This Tm:YAG laser is pumped intracavity within a Nd:YAG laser for multiple-pass absorption. The maximum conversion efficiency of 2.02 μm is 20%, with a slope efficiency of 35% with respect to the absorbed 1.064-μm power.
© 2000 Optical Society of America
P. B. Phua, R. F. Wu, Y. L. Lim, and Ernest Lau, "Room-temperature operation of a multiwatt Tm:YAG laser pumped by a 1-μm Nd:YAG laser," Opt. Lett. 25, 619-621 (2000)