摘要
在拉曼-奈斯衍射中,衍射光被频移、强度调制、偏转。然而,衍射光的功率与时间、探测位置的关系一直被忽视。从理论和实验上研究了在超声场外任意位置探测到的拉曼-奈斯衍射光功率随时间和探测位置的变化情况。发现拉曼-奈斯衍射光的功率是时间与探测位置的周期函数。另外,衍射光的功率随时间和沿着超声波的传播方向周期变化。最后,衍射光功率的信号可以认为由一系列频率为整数倍超声波频率的余弦信号构成。
In Raman-Nath diffraction,the diffracted light is frequency-shifted,intensity-modulated and deflected.However,the relationships between the power of the diffracted light and the time and detection position have been ignored.We study theoretically and experimentally the variations of the diffracted light power,detected at any position outside the ultrasonic field,with the time and detection position.We find that the diffracted light power is a periodic function of the time and position.Additionally,the diffracted light power varies periodically with the time and along the direction of ultrasonic propagation.At last,the diffracted light power signals can be considered to be composed of a series of cosine signals with frequencies that are integer multiples of the ultrasonic frequency.
作者
翁存程
蒋丽钦
章小曼
WENG Cuncheng;JIANG Liqin;ZHANG Xiaoman(College of Physics and Energy;College of Photonic and Electronic Engineering,Fujian Normal University,Fuzhou 350007,China)
出处
《实验室科学》
2021年第4期33-36,共4页
Laboratory Science
基金
福建省自然科学基金(项目编号:2019J01268,2018J01659)
福建省教育厅科技项目(项目编号:JAT170128)
福建师范大学本科教学改革研究项目(项目编号:I201812031)。
关键词
声光
拉曼-奈斯衍射
衍射
acousto-optic
Raman-Nath diffraction
diffraction
