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

Linear moving meters designed on the basis of laser probing of scales of a type: Surface acoustic wave (SAW) - Diffraction grating (DG)

A comparative analysis of moving meters schemes of an acoustic-optical type is carried out. Reference scales formed by surface acoustic waves and diffraction gratings are used in these schemes. The system SAW-DG is probed by a laser beam. The measurement of movement is effected by change of the phase of a signal at SAW frequency in the optoelectronic channel. Repeatability, resolving power, exactitude, range of measurements are analyzed. The resolving power better than 0,05 microns can be reached using SAW wave-length in a range of 30 up to 100 microns

Linear moving meters designed on the basis of laser probing of scales of a type: Surface acoustic wave (SAW) - Diffraction grating (DG)

A comparative analysis of moving meters schemes of an acoustic-optical type is carried out. Reference scales formed by surface acoustic waves and diffraction gratings are used in these schemes. The system SAW-DG is probed by a laser beam. The measurement of movement is effected by change of the phase of a signal at SAW frequency in the optoelectronic channel. Repeatability, resolving power, exactitude, range of measurements are analyzed. The resolving power better than 0,05 microns can be reached using SAW wave-length in a range of 30 up to 100 microns

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

Экспериментальное исследование акустооптического взаимодействия в волноводном интерферометре

Приводятся результаты экспериментального исследования передаточных характеристик и эффективности считывания сигналов в устройствах на поверхностных акустических волнах с помощью полоскового волноводно-оптического интерферометра. Экспериментальный макет был изготовлен на подложке из ниобата лития YZ-среза. Он содержал полосковый волноводный двухплечевой интерферометр с электродами для электрооптической корректировки начального сдвига фаз между оптическими волнами в плечах интерферометра и возбудитель поверхностных акустических волн встречно-штыревого типа. Полученные результаты могут найти применение при разработке схем обработки сигналов с использованием ПАВ и при конструировании оптических модуляторов

An optical setup for measuring amplitude and phase distributions of surface acoustic waves

The setup is intended for measuring amplitude and phase distributions of surface acoustic wave fields in a frequency range of 10-100 MHz. Optimal parameters of the setup and its elements are presented. The threshold detection amplitude of surface acoustic waves is 10-4 nm for a 1-kHz reception bandwidth. The phase channel instability does not exceed 0.2° during the measurement cycle. The relative difference between the velocities at the free and metal-coated surfaces is obtained from phase measurements with a test sample. The result is in good agreement with reference data. © 1998 MAHK Hayka/Interperiodica Publishing

Modulator of laser radiation

A new mechanical modulator of laser radiation is proposed. The working principle is based on the specific diffraction of coherent radiation by a deep reflection grating with rectangular profile. The modulator can be used in various wavelength ranges. © 2012 Pleiades Publishing, Inc