高重复率电光调Q的高光束质量Nd∶YVO_4板条激光器

High Repetition Rate Electro-Optically Q-Switched Nd∶YVO_4 Slab Laser with High Beam Quality Output

部分端面抽运混合腔板条激光器可以在紧凑的空间内实现大功率高光束质量的激光输出。利用这一技术并结合具有增益高、荧光寿命短等特点的Nd∶YVO4晶体 ,配合新型高重复率的电光Q开关 ,易于实现高频窄脉冲高光束质量的激光输出。在德国EdgeWaveGmbH进行了混合腔电光调Q激光器的合作研究中 ,实现了高重复率近衍射极限的输出 ;在以 5kHz的高重复率运转时 ,获得了单脉冲能量 7 2mJ ,脉宽 5 7ns,平均功率约 36W的脉冲 ;当重复率高达 5 0kHz时 ,输出的激光脉冲的参量是单脉冲能量 1.6mJ,脉宽 9 5ns,平均功率超过 80W。实验所测的光束质量因子M2 小于 2。

Partially end-pumped slab laser using hybrid resonator is a favourable concept to scale high power with high beam quality in compact dimension. Nd∶YVO 4 have the advantages of large laser cross section and short fluorescence lifetime. These features are required in high repetition rate short pulse length applications. A electro-optically Q-swithced slab laser with hybrid resonator has been realized. High repetition rate pulse with high beam quality output was measured. At 5 kHz operation, Q-swithced laser with pulse energy of 7.2 mJ and pulse width of 5.7 ns was obtained. The energy and width were 1.6 mJ and 9.5 ns respectively when the repetition rate reached 50 kHz. The beam quality factor M 2 was lower than 2.