高功率激光驱动器中的若干关键工程光学问题

高功率激光装置是一个复杂的有源巨型光学工程,其性能指标要求逼近科学技术与物理极限。驱动器研制有物理设计、工程光学和结构工程设计三大过程,工程光学在其中起着重要作用。高功率激光装置工程光学设计需遵循其特有的设计原则和要点,以保证装置的高性能。根据驱动器设计指标和设计特点,从总体光学设计、光束质量控制以及光束打靶精度控制方面,综述了高功率激光装置工程光学设计中的关键科学技术问题以及相应解决方法,为未来高功率激光驱动器的发展提供必要的工程设计参考。     

Comparative study on self-pulsation effect in Erbium- Ytterbium co-doped fiber laser under bi-directional and unidirectional cladding-pumping regime

Self-pulsation effects of cladding-pumped Erbium-Ytterbium co-doped fiber laser （EYDFL） at around the lasing threshold are investigated. It is demonstrated that laser output of the Erbium-Ytterbium co-doped fiber under the bi-directional pumping regime is more stable than that under the unidirectional pumping one due to the relatively uniform pumping of the fiber. Mechanisms of self-pulsations in the laser system are discussed and possible techniques to avoid self-pulsing and stabilize the laser are proposed.