摘要
利用传输矩阵法对太赫兹自由电子激光光腔光子晶体镜进行了模拟设计,中心波段在1～3THz。对光腔镜的光子晶体结构参数如介质厚度、层数、折射率与反射率的关系等进行了研究,并给出了一维光子晶体用于高反镜的设计方法。通过对耦合输出镜光子晶体中引入缺陷层情况的数值模拟,发现通过对缺陷层的调节设计,可以实现耦合输出率的可调谐;并给出了可用于THz自由电子激光光腔耦合输出镜的调节方法。通过对介质层厚度的调节设计,可以实现反射光谱的整体移动,从而实现宽谱可调谐,扩大了高反镜及耦合输出镜的调节范围。
A 1-D photonic crystal （PC） mirror of the optical resonator for THz free electron lasers （FELs） is designed theo- retically with central frequencies from 1 to 3 THz. The relationship between the reflection spectrum and structural parameters of 1-D PC, such as dielectric thickness, number of layers, and refraction index, is studied. A systematical method to design PC mir- rors with high reflectivity is proposed. The out-couplers in the presence of defect layers in PC structure is simuiated. It is shown that the out-coupling ratio of the resonator is dynamically tunable by careful adjustment and design of the defect layers. A practi- cal tuning method for THz FELs using PC mirrors is proposed. Moreover, the shift of the whole reflection spectrum is also viable by adjusting the dielectric layer thickness, which extends the tuning range of high reflection PC mirrors and out-couplers. 1
出处
《强激光与粒子束》
EI
CAS
CSCD
北大核心
2013年第1期77-81,共5页
High Power Laser and Particle Beams
基金
国家自然科学基金项目(11105019)
中国工程物理研究院科学技术发展基金项目(2011B0401066)
国家高技术发展计划项目
关键词
自由电子激光器
光腔
太赫兹
光子晶体
可调谐
free electron laser
optical resonator
terahertz
photonic crystal
dynamically tunable
