Теоретический анализ дифракции гауссова пучка на ступенчатой фазовой структуре (СФС)

The paper analyzes the interaction of a Gaussian beam with a phase step structure (PSS). The shape of the spatial spectrum at the output of such a scheme is examined. The most detailed description was done for the case when the size of the PSS phase difference is 180 degrees. The effects that occur at the displacement of SPS in the plane perpendicular to the direction of incidence of the laser beam were considered. Discussions for the possible practical application of the scheme were carried out.В работе проведён анализ взаимодействия гауссова пучка со ступенчатой фазовой структурой (СФС). Исследована форма пространственного спектра на выходе такой схемы. Наиболее детально описан частный случай, когда величина фазового перепада СФС составляет 180 градусов. Исследованы эффекты, которые имеют место при смещении СФС в плоскости, перпендикулярной направлению падения лазерного излучения. Обсуждаются возможные практические применения схемы

Исследование оптоэлектронного датчика угловых смещений на основе глубокой отражательной фазовой дифракционной решётки

An optoelectronic device for measurements of small angular displacements based on a diffraction of a laser beam on a deep reflective phasetype grating was suggested and investigated. The grating's depth is about several wavelengths. The zero diffraction order's power dependency on the incident angle of a laser beam was investigated theoretically and experimentally. There were found conditions when linear conversion of angular vibrations into changes of power of zero order took place. The experimentally measured sensitivity of the device was rad with channel bandwidth of 800 Hz and signal-to-noise ratio 10.Предложен и исследован оптоэлектронный датчик малых угловых перемещений на основе дифракции лазерного пучка на глубокой отражательной фазовой дифракционной решётке. Проведён теоретический анализ и экспериментальные исследования характеристик датчика

Experimental investigation of laser beam diffraction on phase step and its practical applications

The change in shape of the spatial spectrum, which is a result of the interaction of a focused laser beam with a phase step structure (PSS), is investigated. As a laser beam passes through a PSS, a spatial spectrum of radiation in the form of two peaks with a deep gap in between is generated. The change in the peaks' structure as the PSS moves relative to the optical axis of the laser beam is studied in detail. On the basis of the experimental results, a new scheme for measuring small linear and angular deviations is proposed. © The Institution of Engineering and Technology 2014

Experimental investigation of laser beam diffraction on phase step and its practical applications

The change in shape of the spatial spectrum, which is a result of the interaction of a focused laser beam with a phase step structure (PSS), is investigated. As a laser beam passes through a PSS, a spatial spectrum of radiation in the form of two peaks with a deep gap in between is generated. The change in the peaks' structure as the PSS moves relative to the optical axis of the laser beam is studied in detail. On the basis of the experimental results, a new scheme for measuring small linear and angular deviations is proposed. © The Institution of Engineering and Technology 2014