Electrically controlled polarization beam splitting device with adjustable splitting ratio, and splitting ratio control method

Abstract

The invention relates to an electronically controlled polarization beam splitting device with an adjustable splitting ratio, and a splitting ratio control method. The electronically controlled polarization beam splitting device comprises a light transmission light path composed of a polarizer, an achromatic quarter-wave plate and a liquid crystal polarization grating which are arranged in sequence, and an external control voltage driving device connected with the liquid crystal polarization grating. The included angle between the polarizing direction of the polarizer and the fast axis of the achromatic quarter-wave plate is 45 DEG, the liquid crystal polarization grating can realize polarization beam splitting, and the external control voltage driving device can change the birefringence of the liquid crystal polarization grating to realize continuous change of the splitting ratio. According to the invention, polarization wave division of any broadband incident light beam can be realized, and the splitting ratio can be continuously, accurately and dynamically adjusted through external control voltage.

Description

technical field [0001] The invention belongs to a polarization beam splitting device and method with adjustable splitting ratio, and relates to an electrically controlled and adjustable splitting ratio polarized beam splitting device and a method for controlling the splitting ratio. In particular, it relates to a polarization beam splitting method in which the splitting ratio of a wide-band arbitrary beam can be continuously and accurately adjusted dynamically through an external control voltage. It can be used in the field of optoelectronics to realize polarization splitting of a wide-band arbitrary beam. high efficiency. Background technique [0002] The beam splitter is one of the important components in the optical path system. The traditional beam splitting methods mainly rely on beam splitting prisms, polarizing beam splitting prisms, beam shifters, etc., but the splitting ratio of these beam splitting methods is fixed and cannot be adjusted, and the output beam The o...

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Problems solved by technology

[0003] Existing polarization beam splitters with adjustable polarization splitting ratio are also based on the electro-optical effect of liquid crystal materials to realize polarization splitting of light beams. Device and its working method", which discloses a polarizing beam splitter with an electrically controlled and adjustable polarization splitting ratio, which changes the phase delay of the entire liquid crystal cell through an external control voltage to change the polarization state of the incident beam, and then uses a beam splitting prism to achieve light splitting output, but its beam-splitting element is still a traditional polarization beam-splitter prism, which can only achieve precise and controllable light-splitting of a single wavelength

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