碘激光的H2振动受激拉曼阈值研究

摘要

首次实现了脉冲光解碘激光作为基频光的氢气振动受激拉曼变频,对碘激光的波长转换有着重要意义.在碘激光单脉冲能量100～130 mJ(脉宽100 ns)的条件下, 采用双次聚焦技术降低了高压氢气的振动受激拉曼变频的阈值,获得了波长为2900 nm中红外激光,光子转化效率最高达到8.7％.实验发现当拉曼介质氢气气压大于1 MPa后,一级斯托克斯光的拉曼转化效率不再随气压变化,并对这一现象进行了理论分析和归属.%The hydrogen vibrational stimulated Raman scattering (SRS) pumped by a photolytic iodine laser (PIL) has been demonstrated for the first time.Under the condition of PIL pulse energy of 100-130 mJ (100 ns), double pass configuration is applied to reduce the SRS threshold successfully.SRS laser of 2900 nm is obtained and the photon conversion efficiency reaches 8.7％.The conversion efficiency of the first stokes light is found not affected by the pressure of hydrogen, once it is more than 1 MPa.Theoretical analysis is applied to explain this phenomenon.