采用小孔选模的方波导CO_2激光器研究  

Mode selection for square waveguide CO_2 laser by small aperture

作　　者：张延超[1] 田兆硕[1] 孙正和[1] 付石友[1] 孙剑峰[1] 王骐[1] 

机构地区：[1]哈尔滨工业大学(威海)信息光电子研究所,山东威海264209

出　　处：《激光杂志》2013年第4期11-12,共2页Laser Journal

基　　金：哈工大基础研究杰出人才计划(HIT.BRET。2010014)

摘　　要：为了获得高光束质量的单频基模CO2激光输出,本文提出采用小孔选模的光栅选支射频方波导CO2激光器,在激光谐振腔内插入一与波导尺寸相近的圆孔光阑以抑制高次横模的产生。实验上研究了在加入及未加入小孔光阑情况下的激光模式及功率变化情况。在注入射频功率180W的情况下,加入光阑选模后获得功率为2W的10P(20)支的CO2基模激光输出,与未加光阑的激光器对比,可更长时间稳定的工作在EH11模式。小孔选模方式为方波导激光器的模式选择研究提供参考。In order to obtain a high beam quality fundamental mode CO2 laser output, this paper proposes a method of using small aperture to select transverse mode for RF waveguide CO2 laser with line selected by grating. The circular aperture with size similar to square waveguide cross section is inserted into the laser cavity to inhibit generation of higher- order transverse modes. The laser transverse mode and laser output power changes with time were studied experimentally before and after aperture inserting. Under the condition of 180W RF power, the fundamental mode laser with 2W output power of 10P （20） branch was obtained. The laser can operate stable for a long time in EH11 mode. The method of transverse mode selection can give reference for the research on mode selection of squarewaveguide laser.

关 键 词：光阑 选模 波导CO2激光器 

分 类 号：TN248.2[电子电信—物理电子学]