LD-pumped Nd∶YAGm multi-band laser

To acquire high efficiency multi-band laser，we used the acousto-optic Q-switched technology driven by high repetition rate and the laser-diode(LD) sidepumped technology to obtain the 1.06 m laser output with high repetition rate ,high power and narrow width. Then we got two 1.06 m linearly polarized light beams in vertical and horizontal directions by external cavity polarimeter. The vertical beam was split into one 1.46 m laser beam and one 3.9 m mid-IR beam by pumping periodically poled lithium tantalate (PPLT), and another 1.06 m horizontal laser beam was mixed with the 1.46 m and 3.9 m beams to realize triple-waveband coaxial laser output finally. As the input current was 35A and the Q-switched frequency was 10 kHz, we could get 1.06 m laser with 140 W output. After laser splitting and pumping PPLT, we could get 3.9 m and 1.46 m laser output with top power of 6.3 W and 8.6 W, respectively, and the difference frequency conversion efficiency was 21.3%. The experiment results demonstrate that the high-repetition narrow-width 1.06 m laser can be acquired by using high-repetition-rate electro-optical Q-switched technology and LD-side-pumped technology, and pumping PPLT can gain 3.9 m and 1.46 m laser output.