多种增益介质混合、高峰值功率近衍射极限激光系统研究

The laser system with fiber-solid hybrid has unique advantages in obtaining ultra-fast laser with high peak power and near-diffraction-limited output, and has become a hot research area in recent years. Actually, due to the existence of the thermal effect of the solid gain media, to obtain high laser amplification power and laser beam quality at the same time, complicated pumping and cooling methods are generally applied..In this project, the ultra-fast laser output is achieved by the hybrid amplification of fiber and traditional rod media. Instead of focusing on the mitigation technology of the thermal effect of the gain media in the aspect of beam quality management, we use the thermal effect of the gain media to modulate the beam wavefront. The opposite sign of the wavefront distortion to the initial aberration is obtained after the focus via the spatial propagation of the beam. Then the wavefront of the beam is compensated by the thermal effect of the gain media itself in the next-stage amplifier, thereby realizing the active management of the laser beam quality..The research is based on the traditional gain media, which fully exploits the advantages of fiber for its simplicity and stability, Nd:YVO4 for its high gain and Nd:YAG for its good thermal characteristics. The innovative method of beam quality management reduces the technical complexity and it’s a new approach to get high peak power and near-diffraction-limited laser output.

光纤和固体介质混合的激光系统在获得高峰值功率、近衍射极限输出的超快激光方面具有独特优势，近年来成为领域内的研究热点。实际研究中由于固体增益介质热效应的存在，要同时兼顾激光放大功率和激光光束质量，往往需要复杂的泵浦和冷却方式。. 本项目采用光纤和传统棒状介质混合放大的方式获得超快激光输出。在光束质量管理方面没有把研究重点放在对增益介质热效应的缓解技术上，而是利用增益介质的热效应对光束波前进行调制。通过光束的空间传播在焦点后获得与初始像差反号的波前畸变，再利用下一级放大器中增益介质自身的热效应对光束的波前进行补偿，从而实现对激光光束质量的主动管理。. 研究方案基于传统增益介质，充分发挥光纤介质简单稳定、Nd:YVO4介质增益高和Nd:YAG介质热特性好的优势，通过创新性的光束质量管理方法降低了技术复杂性，是获取高峰值功率近衍射极限激光输出的一种新途径。

光纤和固体介质混合的激光系统在获得高峰值功率、近衍射极限输出的超快激光方面具有独特优势，近年来成为领域内的研究热点。实际研究中由于固体增益介质热效应的存在，要同时兼顾激光放大功率和激光光束质量，往往需要复杂的泵浦和冷却方式。. 本项目采用光纤和传统棒状介质混合放大的方式获得超快激光输出。在光束质量管理方面在光束质量管理方面没有把研究重点放在对增益介质热效应的缓解技术上，而是利用增益介质的热效应对光束波前进行调制。通过光束的空间传播在焦点后获得与初始像差反号的波前畸变，再利用下一级放大器中增益介质自身的热效应对光束的波前进行补偿，从而实现对激光光束质量的主动管理。. 研究方案基于传统增益介质，充分发挥光纤介质简单稳定、Nd:YVO4介质增益高和Nd:YAG介质热特性好的优势，通过创新性的光束质量管理方法降低了技术复杂性，是获取高峰值功率近衍射极限激光输出的一种新途径。