To obtain high power 589-nm yellow laser, a T-shaped thermal-insensitive cavity is designed. The optimal power ratio of 1064- and 1319-nm beams is considered and the fundamental spot size distribution from the output mirror to the two laser rods are calculated and simulated, respectively. As a result, a 589-nm yellow laser with the average output power of 5.7 W is obtained in the experiment when the total pumping power is 695 W. The optical-to-optical conversion efficiency from the fundamental waves to the sum frequency generation is about 15.2% and the pulse width is 150 ns at the repetition rate of 18 kHz. The instability of the yellow laser is also measured, which is less than 2% within 3 h. The beam quality factors are M<sup>2</sup><sub>x</sub>=4.96 and M<sup>2</sup><sub>y</sub>= 5.08.
© 2009 Chinese Optics Letters
Xiuyan Chen, Xiu Li, Haolei Zhang, Haowei Chen, Jintao Bai, and Zhaoyu Ren, "589-nm yellow laser generation by intra-cavity sum-frequency mixing in a T-shaped Nd:YAG laser cavity," Chin. Opt. Lett. 7, 815-818 (2009)