Novel symmetrical photoelastic modulator

Abstract

The present invention relates to a photoelastic modulator and particularly relates to a novel polarized light modulator structure based on a photoelastic effect. Through controlling the driving voltage of two groups of piezoelectric actuators, the polarized light modulation of a large optical path difference and the polarized light modulation with a modulation fast axis in circular motion can be realized, the photoelastic modulator has no moving component, and the working of the photoelastic modulator is stable. The photoelastic modulator comprises piezoelectric actuators, a light through crystal and a driving control box. The two light through surfaces of the light through crystal are regular octagons and are parallel to each other, the same rectangles are formed by side faces. The piezoelectric actuators are softly connected to the middle positions of the rectangles through connection glue layers. The width direction of the piezoelectric actuators is consistent with the light through thickness direction of the light through crystal, the width is roughly larger than the light through thickness, and the e piezoelectric actuators are connected to the electrical output end on the driving control box through an electrical adapter. The novel polarized light modulator structure is mainly applied to the aspect of photoelastic modulators.

Description

technical field [0001] The present invention relates to an elasto-optic modulator, in particular to a novel symmetric structure elasto-optic modulator, more specifically a novel polarized light modulator structure based on the elasto-optic effect, which can realize a relatively large optical path difference, an optical path difference Elasto-optic modulation with adjustable range, in addition, it can also realize elasto-optic modulation with optical axis rotation. Background technique [0002] The elastic-optic modulator is an artificial birefringent opto-electromechanical device designed based on the elastic-optical effect. Both the piezoelectric driver and the light-passing crystal work in the fundamental frequency resonance state, and the driving force generated by the resonance of the piezoelectric driver is effectively coupled into the light-passing crystal. Optical crystals resonate to produce periodically varying birefringence. When the polarized light passes through...

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Problems solved by technology

However, the existing elastic optical modulators cannot give full play to most of their application advantages at the same time in the application. For example, the modulation optical path difference of a single elastic optical modulator is limited, which limits its application in the field of real-time, high-speed, and high-stable spectral measurement; according to the literature [Linear birefringence in CaF 2 measured at deep ultraviolet and visible wavelengths, Optical Engineering, 2004, 3(1):115-121] reported that a single elasto-optic modulator was applied to the measurement of linear birefringence. In order to simultaneously measure the birefringence amplitude and the direction of the fast axis, the optical The system design is complex and difficult to implement; the static birefringence introduced by the existing fixed method of the elastic optical modulator limits its application in the field of high-precision and high-sensitivity measurement

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