摘要
本文对湍流下运转的 CW CO_2激光等离子体的透镜效应进行了理论和实验研究。湍流的引进大大增强了激光气体的二维扩散和热传导,导至欧姆加热更加均匀。对一个2米长的快速流动 CO_2激光放大器的计算,透镜焦距约为-200米。实验观测值为-100米。这表明,不加任何光学补偿元件,一个十米长的线型 CO_2激光放大器达到5千瓦输出是可能的。
An analytic and experimental investigation on lensing effect of CO_2 laser plasma byintroducing turbulence in flow is presented.The turbulence greatly increases the effective ambipolardiffusion and heat conductivity of the laser gas.The increase in ambipolar diffusion causes the elect-ron density profile to be more uniform over the cross section,so that the ohmic heating is more uni-eorm.The calculation indicates that thermal lensing effect in fast-flow CO_2 laser amplifier,for exam-ple 2 M length,produces a focal length in the order of magnitude of -200 M.In the experimentalobservation the focal length is -100 M.These results have shown that the optimum configuration of a10 M length linear CO_2 laser amplifier for 5 kW output power is feasible without optical compensators.
出处
《应用激光》
1985年第1期6-8,28,共4页
Applied Laser
