研究目的
To study the scattered light when a strip beam of ordinary polarized light and extraordinary polarized light is incident to the LiNbO3:Fe crystal, respectively, with the angle between the strip beam and the crystal c-axis varied while keeping the polarization unchanged.
研究成果
The scattered light grows along the direction of the strip beam for both polarizations, with energy transferring efficiency decreasing as the angle increases. O-light scattering is more efficient and reaches steady state faster than e-light scattering. The direction of energy transfer differs: for e-light, it is along the c-axis, while for o-light, it is at an angle to the c-axis due to photovoltaic effects. The phase gratings exhibit chirping, becoming denser from the middle to the sides.
研究不足
The study is limited to LiNbO3:Fe crystals and specific incident angles; results may not generalize to other materials or conditions. The phase gratings are not uniform, showing chirping, which could affect applications. The experimental setup relies on manual rotation and time-based observations, potentially introducing variability.
1：Experimental Design and Method Selection:
The experiment involves using a cylindrical lens to focus a laser beam into a strip beam and rotating the lens to change the angle between the strip beam and the c-axis of the LiNbO3:Fe crystal, while maintaining either ordinary (o-light) or extraordinary (e-light) polarization. The far-field diffraction patterns and phase gratings are observed and recorded.
2：Sample Selection and Data Sources:
A LiNbO3:Fe crystal is used as the sample. Data is collected from the far-field scattering patterns and phase gratings recorded using a camera and CCD.
3：List of Experimental Equipment and Materials:
Nd:YAG laser (λ=532 nm), pinhole filter, collimated lens, cylindrical lens (f=20mm), rotator for the cylindrical lens, LiNbO3:Fe crystal, optical screen, camera, CCD, power meter.
4：Experimental Procedures and Operational Workflow:
The laser beam is polarized, passed through a pinhole filter and collimated lens to become parallel, then focused by a cylindrical lens into a strip beam. This beam is incident on the crystal at various angles (0°, 30°, 45°, 60°, 90°) for both o-light and e-light polarizations. The far-field patterns are recorded on a screen with a camera, and phase gratings in the crystal are recorded with a CCD over time until steady state is reached.
5：Data Analysis Methods:
The energy transferring efficiency is calculated by measuring power at a point on the light strip before and after scattering. Patterns are analyzed visually, and diffraction efficiencies are compared.
独家科研数据包，助您复现前沿成果，加速创新突破
获取完整内容
