A Longitudinal Electro-Optic Modulator with Large Clear Aperture and Large Field of View

Abstract

The invention relates to the technical field of light polarization state modulation, in particular to a longitudinal electro-optical modulator with the large clear aperture and the large field angle. The electro-optical modulator is large in clear aperture and field angle, short in light transmission length, compact in structure, variable in phase delay along with modulation voltage and uniform in modulation. An electro-optical uniaxial crystal with the large electro-optical coefficient is selected as a light transmission crystal, the longitudinal electro-optical effect of the electro-optical crystal is used for manufacturing the electro-optical modulator, the uniaxial crystal with the reciprocal birefringence optical path difference value and electro-optical crystal birefringence optical path difference value is adopted for eliminating static phase delay into which large field angle incident light may be introduced, a transparent electrode is plated and packaging is performed; a configured high voltage driver can select pulse, square wave, sine or direct-current voltage and other output modes for flexible design according to application occasions and a modulation effect needing to be achieved on incident light, and the novel theory and method are provided for the design of a polarized light modulator. The longitudinal electro-optical modulator is mainly applied to the aspects such as pulse laser light source, polarization imaging and optical communication.

Description

technical field [0001] The invention relates to the technical field of light polarization modulation, and more specifically, to a longitudinal electro-optic modulator with a large optical aperture and a large viewing angle. Background technique [0002] The light-passing medium, especially some optical crystals, changes the refractive index ellipsoid under the action of an external electric field and produces a phase delay effect on the incident light, which is called the electro-optic effect. modulation device. According to the refractive index change is proportional to the first power or the second power of the electric field intensity, it is called the primary electro-optic effect (Pockels effect) or the secondary electro-optic effect (Kerr effect); according to the direction of the applied electric field and the direction of light passing parallel or perpendicular, They are also called longitudinal electro-optic effect and transverse electro-optic effect respectively. ...

AI Technical Summary

Problems solved by technology

None of the above electro-optic modulators meets the application requirements of large optical aperture, large field of view, short optical length and compact structure.

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