A High Power Single Frequency Diode Side-Pumped Nd:YAG Ring Laser

We demonstrate a high-power single-frequency diode-side pumped Nd:YAG laser at 1064 nm. A bow-tie ring cavity configuration comprising two plane and two curved mirrors with two-rod birefringence compensation is employed. The influence of length L_x between two curved mirrors on output power and beam quality is investigated theoretically and experimentally while the separation of the flat mirrors is set to be 656 mm and the fold angle is 10°. When the pump powers are 358, 343 and 329 W at 808 nm, the maximal output powers of 31.9, 26 and 14.1 W are obtained with beam quality factors M² = 1.41, 1.12 and 1.20 for L_x = 205, 215 and 230 mm, respectively.