Accelerating space-charge gratings in wide-bandgap semiconductors

Photorefractive Photonics 2017

Sokolov, Igor^1 ; Bryushinin, Mikhail^1

Ioffe Institute, Politekhnicheskaya 26, St. Petersburg

194021, Russia^1

关键词: Accelerated motion;    Interference patterns;    Light patterns;    Linear frequency modulation;    Non steady-state;    Photo-electromotive force;    Space-charge wave;    Two wave mixing;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/867/1/012004/pdf
DOI  :  10.1088/1742-6596/867/1/012004

来源: IOP

【 摘 要 】

The excitation of the non-steady-state photoelectromotive force and two-wave mixing signals is theoretically investigated for the case of uniformly accelerated motion of the recording light pattern. Such illumination is usually created by the linear frequency modulation of the interfering light beams. For the both effects we predict the pulsed response arising at the moments, when the velocities of the interference pattern and space-charge wave coincide. The application of the effects in laser Doppler velocimeters and accelerometers is discussed.