碘激光的H2振动受激拉曼阈值研究

Vibrational stimulated Raman conversion threshold of H_2 pumped by iodine laser

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100~130mJ(脉宽100ns)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2900nm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 ap- plied to reduce the SRS threshold successfully. SRS laser of 2900 nm is obtained and the photon conversion efficiency reaches 8. 70/00. 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.