基于线偏振方向旋转结构的双程1064nm-MOPA激光器的研究

针对低功率1064nm激光放大过程中提取效率较低的问题,提出了共轴Nd:YVO_4放大方式。通过线偏振光方向旋转方法,完成以Nd:YVO_4晶体作为增益介质的共轴双程放大结构。该结构实现了Nd:YVO_4晶体的共轴双程放大,而不是离轴放大方式,这可以使放大过程中不需要考虑偏振对放大效率的影响。在100k Hz的声光调制下,获得平均功率36.9W的输出,对应放大级转化效率44.5%。通过实验证实,低功率1064nm激光在该结构中有效地提取了放大级能量。

The Study of Double-pass 1064nm-MOPA Laser Based on Linear Polarization Orientation Rotation Configuration

According to the problem of low extraction efficiency in the amplified process of 1064nm laser, coaxial am-plification way is presented with Nd:YVO4 crystal. By using orientation rotation of linear polarization way,double-pass configuration is achieved with the gain medium of Nd:YVO4 crystal. Coaxial double-pass amplification of Nd:YVO4 crystal is realized, instead of off-axis way, which no more consideration of polarization state affecting extraction effi-ciency is needed in the process of amplification. At the frequency repetition of 100kHz,average output power of 36.9W is obtained in the acousto-optic regime,corresponding to the optical conversion efficiency of 44.5%. In prove of experi-ment,energy of amplified stage of this configuration is effectively extracted.