摘要
多腔窄带薄膜滤光片在倾斜入射时中心透射波长会向短波方向移动,由此可制备角度调谐滤波器。但其透射光斑在倾斜入射时会出现明显的斑展宽现象,由此产生的接收端耦合度及干涉级次的降低会导致其透射光谱的插入损耗迅速增大,会限制其有效波长调谐范围。传统的多光束叠加法可以对窄带滤光片斜入射时的透射光斑展宽现象进行仿真,但是在光强分布上与实验结果有着较大的误差。本文基于快速傅里叶变换及菲涅尔公式,提出了一种新颖的频域递推算法来计算光斑的展宽程度及透射光强分布,计算了从0度到60度倾斜入射范围内光斑展宽以及透射率的变化情况。理论计算和实验结果都表明该方法较之传统的多光束叠加算法结果更准确且计算效率高。
The central wavelength of the multi-cavity narrowband thin film filter will shift to short wavelength in oblique incidence,and it can be fabricated as an angle tunable filter. The transmitted-facular of the narrowband filter will broaden obviously while the incident angle is increassing. It will cause great insertion loss of the transmission spectrum and limit its wavelength tunahle range because the coupling degree and the interference order will be decreased. Traditional beam spatial superposition method can simulate the phenomenon of the transmitted-facular broadening in oblique incidence. However, the simulation results have high errors relative to the experimental results. Based on the fast Fourier transform （FFT） and the Fresnel formula, a novel frequency domain recursive algorithm for calculating the transmitted- facular broadening and the transmitted-intensity distribution is proposed in this paper. It simuates the transmitted-facular broadening and transmitted-intensity distribution of the narrowband filter from normal incidence to 60° oblique incidence. The simulation and the experiment results show that it has more accurate result and higher efficiency than the traditional beam spatial superposition method.
出处
《光电子．激光》
EI
CAS
CSCD
北大核心
2013年第3期459-463,共5页
Journal of Optoelectronics·Laser
基金
国家自然科学基金(61205062)
湖北省自然科学基金(2012FFB02701)
华中科技大学文华学院创新基金(J02005301)资助项目
关键词
窄带滤光片
频域
斜入射
快速傅里叶变换(FFT)
narrowband filter
frequency domain
oblique inddence
fast Fourier transform （FFT）
