摘要
目前基于重叠体光栅的相干组束系统还没有完整的理论模型和参数分析,针对这个问题,本文采用耦合波理论,建立了比较完整的基于重叠体光栅的双光束组束模型,给出了各光束在重叠体光栅内传播的解析解。模型表明,基于重叠体光栅的双光束组束系统其输出光强受两入射光的振幅和位相、体光栅间的相移和折射率调制振幅、光栅厚度、失谐量等多个光学参数的影响。通过数值计算,详细分析了各光学参数对组束结果的影响。最后总结了设计高效重叠体光栅相干组束系统时必须遵循的条件,如必须对光栅厚度进行优化、各光栅的折射率调制振幅必须相同、保证失谐量足够小等。
Aiming at the problem that there is no comprehensive model of coherent beam combining through superposed volume gratings, we establish a comprehensive model for two-beams combining and its analytic formula is derived using coupled wave theory. It shows that the intensity of combined beam is influenced by many factors such as the amplitudes and phases of the two incident beams, the phase shift between gratings, the amplitude of modulated refraction index, the thickness of gratings and the detuning et al. The effect of each optical parameter on combined beam is numerically analyzed in detail. And the sufficient and necessary conditions to realize efficient beam combination were summarized, such as the thickness of gratings must be optimized, the index modulation of each grating must be equal and the Bragg mismatching must be small enough et al.
出处
《光电工程》
CAS
CSCD
北大核心
2008年第4期109-114,共6页
Opto-Electronic Engineering
基金
国家自然科学基金资助项目(60678018)
中国博士后科学基金(20070420220)资助项目
关键词
激光技术
相干组束
重叠体光栅
耦合波理论
laser technology
coherent beam combining
superposed volume gratings
coupled wave theory
