ROTATIONALLY TUNABLE TWO-BEAM INTERFEROMETER WITH A FIXED PHOTOSENSITIVE ELEMENT. PART II. INTERFEROMETER BASED ON A BEAM-SPLITTER BLOCK
V. D. Ugozhaev
Institute of Automation and Electrometry, Siberian Branch, Russian Academy of Sciences, 630090, Novosibirsk, prosp. Akademika Koptyuga, 1
Keywords: двухлучевой интерферометр, симметричный светоделительный блок, неподвижные зеркала, неподвижный светочувствительный элемент, вращательная перестройка угла схождения, голографическая дифракционная решётка, two-beam interferometer, symmetric beam-splitter block, fixed mirrors, fixed photosensitive element, rotational tuning of the convergence angle, holographic diffraction grating
Abstract
A tunable (in terms of the angle of convergence of intersecting light beams) two-beam interferometer with fixed mirrors and a fixed photosensitive element is considered. The photosensitive element is based on a symmetric beam-splitter block where tuning of the interference pattern period is ensured by only one type of motion: interferometer rotation with respect to the motionless source of the collimating light beam. It is demonstrated that the period can be controlled in this way for convergence angles from 30 to 180º; the beam diameter should be at least 10 % of the beam-splitter block length. In this region, the greatest width of the range of convergence angle tuning can exceed 40º, and the admissible beam diameter approaches 40 % of the beam-splitter block length. Comparisons with a similar interferometer based on a beam-splitter cube are performed, and possible areas of application of the considered interferometer are determined.
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