基于波前补偿的高阶高斯光束相干合成  

Coherent Combining of High-Order Mode Lasers with Wave Front Compensation

作　　者：王小林[1] 周朴[1] 赵海川[1] 马阎星[1] 马浩统[1] 许晓军[1] 赵伊君[1] 

机构地区：[1]国防科技大学光电科学与工程学院,湖南长沙410073

出　　处：《中国激光》2010年第12期3025-3030,共6页Chinese Journal of Lasers

基　　金：国防科技大学优秀研究生创新项目(B080702)资助课题

摘　　要：在相同的抽运功率下,激光器工作在高阶模式时比基模高斯工作时有更高的功率输出,将其用于相干合成有望得到更高的功率输出。由于高阶高斯光束内部存在0-π相位差,使得其光束质量较差,相干合成激光亮度也因而受限。提出基于波前补偿的高阶高斯光束相干合成方案,利用光束净化将高阶高斯光束内部0-π相位进行补偿,然后将补偿后的光束用于相干合成。给出了优化式自适应光学光束净化补偿高阶高斯光束内部波前的仿真和实验结果,数值模拟了厄米高斯光束波前补偿前后相干合成的效果。结果表明,波前补偿后相干合成的1倍衍射极限内的桶中功率较波前补偿前相干合成桶中功率提高1个量级甚至2~3个量级。Laser holds a higher output power when working in high-order-mode than working in fundamental mode,coherent combining of high-order mode lasers is a promising way for higher output power.For the inside 0-π phase difference of the wave front,the beam quantity of the high-order mode is not as good as that of the fundamental mode,therefore the brightness of the coherent combining is limited.Coherent combining of high-order mode lasers with wave front compensation is proposed.Inside 0-π phase differences of high-order mode laser are compensated using beam cleanup technology firstly,and then coherent combining is implementing with the wave front compensated lasers.Results of simulation and experiment of inside wave front compensation using optimal algorithm based beam cleanup technology are given.Numerical simulation of coherent combining of high-order Hermite-Guass mode lasers with and without inside wave front compensation is done.Result shows that the power in bucket of one time diffraction limitation of the combining beams with inside wave front compensation is at least 10 times or even more than 1000 times of that value of the combining beams without inside wave front compensation.

关 键 词：激光光学 高阶高斯光束 波前补偿 光束净化 相干合成 

分 类 号：TN24[电子电信—物理电子学]