摘要
本文提出了一种新的平面波导阵列布喇格光栅结构,并给出了在光敏感材料中制作这种波导光栅结构的全息光辐照方法.以LiNbO3∶Fe晶体作为光敏感材料,用不同空间频率的双光束干涉条纹辐照后,通过数字全息技术对晶体的光致折射率分布测量和进行的导波衍射测试结果表明,利用这种光辐照方法在光敏感材料中制作平面波导阵列全息布喇格光栅是完全可行的.其显著的导波衍射现象表明,如果在平面波导阵列中制作多重布喇格光栅,有可能使其成为超密集波分复用(UDWDM)系统中波长复用/解复用的核心器件.
A new kind of planar waveguide array (PWA) with holographic Bragg grating (HBG) fabricated in photosensitive materials irradiated by two beam interference fringes with different spatial frequency is presented in this paper. The PWA with HBG was fabricated in LiNbO 3∶Fe crystal as the photosensitive material. Then the light induced index changes in the crystal were measured by employing digital holography and the guiding diffractions from the waveguide grating were observed in detail. There periodically emerges marked diffraction from the photorefractive HBG in the individual PWA plane as the test beam moves along the direction of the PWA vector. The results show that the PWA with multi HBG formed by irradiation is feasible and may be used as a potential MUX/DEMUX in ultra dense WDM system.
出处
《光子学报》
EI
CAS
CSCD
北大核心
2004年第12期1432-1435,共4页
Acta Photonica Sinica
基金
国家自然科学基金资助项目(60077018)
