侧面抽运国产Nd：YAG陶瓷棒的激光特性

Laser-Diode-Array Side Pumped Nd∶YAG Ceramic Laser

实验研究了激光二极管阵列（LDA）侧向抽运国产Nd：YAG陶瓷棒的准连续及被动调Q激光输出特性。该陶瓷激光器采用LDA侧面紧密环绕均匀排布的抽运结构，陶瓷棒抽运区域长度为20mm，其总尺寸为≠3mm×35mm，掺杂原子数分数为～1％。在千赫兹准连续运转条件下，当平-平谐振腔的输出耦合镜透过率为47．3％时，获得最大平均功率23w的1064nm激光输出，光束发散角为4．5mrad，斜率效率达12％。在谐振腔内插入Cr^4＋：YAG晶体作为被动调Q开关，成功地实现了陶瓷激光器千赫兹重复频率调Q激光脉冲输出，当Cr^4＋：YAG晶体初始透过率为60％时，输出激光脉冲宽度（半峰全宽）可窄至14．5ns，调Q动静比约为40％。

The quasi-continuous-wave and passively Q-switched output performance of laser-diode-array（LDA）-side- pumped domestic Nd： YAG ceramic laser were studied. A uniformly side-around arranged compact LDA pumping structure with pumping length of 20 mm was used in this laser. The Nd： YAG ceramic rod was Ф3 mm× 35 mm sized and 1% （atomic percent） doped. In a piano-piano concave resonator, with the working frequency of 1 kHz, and the output coupler transmission of 47.3%, a quasi-continuous-wave output with an average power of about 23 W at 1064 nm is obtained. The beam divergence angle is 4.5 mrad, and the slope efficiency is up to 12%. In the same condition, using Cr^4＋ ： YAG crystal as the passive Q-switcher, the 1 kHz Q-switched laser pulse is obtained successfully, when the original transmission ratio of Cr^4＋ ：YAG crystal is 60%, the pulse width （FWHM） is less than 14.5 ns ,and the dynamic to static ratio is about 40%.