Optical Characterization of β-FeSi2 Thin Films Prepared by Femtosecond Laser Ablation

Iron disilicide thin films are prepared on fused quartz using femtosecond laser deposition （FsPLD） with a FeSi2 alloy target. X-ray diffraction results indicate the films are single-phase, orthorhombic, β-FeSi2. Field scanning electron microscopy, high resolution transmission electron microscopy, UV-VIS-NIR spectroscopy and Raman microscope are used to characterize the structure, composition, and optical properties of the β-FeSi2 films. Normal incidence spectral transmittance and reflectance data indicate a minimum, direct energy gap of 0.85 eV. The two most intense lines of Raman scattering peaked at 181.3 cm^-1 and 235.6cm^-1 for the film on fused quartz, and at 191.2cm^-1 and 243.8cm^-1 for the film on Si （100）, are observed.     

基于γ51的电光调制器的可行性研究

通过对不同晶系线性电光系数矩阵的分析计算,研究了利用晶体电光系数γ51实现电光调制的可能性.结果分析表明,在电场中的γ51引起折射率的变化与x方向电场强度E12成正比;利用KTa0.35Nb0.65O3晶体的巨大γ51参数引起的二次电光效应,可以获得较低的半波电压;在立方-四方相变点附近的KTa1-xNbxO3晶体有极大克尔系数的现象,同时γ51参数电光效应也得到了解释.     

大学物理实验的微观教学模式及实践

对大学物理实验的基本特点进行了分析研究,提出了在大学物理实验教学中实施微观教学的建议,并介绍了一种量化大学物理实验教学的方法。