新型分布反馈式气体激光器

NOVEL DISTRIBUTED FEEDBACK GAS LASERS

本文论述了三种分布反馈(DFB)式气体激光器的理论及其首次实现的情况,这三种气体激光器是线性DFB激光器、螺旋DFB激光器和与二阶DFB效应相关的切向入射光栅式激光器。这些新型激光器是分别把线性周期金属波导、螺旋型金属波导以及带光栅的楔形金属波导应用到496μm光泵远红外CH_3F激光器上而实现的。螺旋DFB结构在激光研究上是一个新的概念,它引起人们的兴趣不仅在微波技术方面,同样在染料激光器和胆甾醇液晶的研究方面。DFB气体激光器未来研究的一个目标是实现10μm波长的CO_2 DFB激光器,它将具有很优异的特性和应用价值。

Theory and first realization of three types of distributed feedback (DFB) gas lasersare reviewed. These are the linear DFB gas laser, the helical DFB laser and the grazing-incidence gas laser which is related to the second-order DFB effect. The realization ofthese novel types of lasers was achieved by incorporation of linear periodic, helical andwedged grating metal waveguides in an optically pumped far-infrared 496μm CH_3Flaser. Helical DFB represents a new laser concept which is also of interest in microwavetechniques and in research on dye lasers and cholesteric liquid crystals. A goal of futurestudies on DFB gas lasers is the realization of 10μm CO_2 DFB lasers which promiseexcellent characteristics and applications.