Polarizer for generating single polarization

Abstract

The invention refers to a polarimeter producing single polarization. It consists of lengthened prism, underside metal film and transmission-increasing film ,and uses the lengthened prism and the metal film to form total reflection construction and makes excited surface plasma wavlength transmit on the interface between the lengthened prism and the metal film. The surface plasma resonance only attenuates P wave in the laser beam and allows S wave to completely pass through. It leads in the laser beam by the fibre-optical joint, makes the beam irradiate at the angle of the resonance, many times exictes the resonance on the basal plane of the prism for completely getting rid of the P wave and only leaving the S wave, which realizes the polarization.

Description

technical field [0001] The invention relates to a polarizer for generating single polarization, in particular to a polarizer for generating single polarization based on surface plasmon resonance in an elongated prism, belonging to the field of optoelectronic communication and optical information processing. Background technique [0002] In the past two decades, with the development of laser technology, especially optical communication technology, the research and application of optical polarization devices have made great progress. Among them, the most common one is the polarizing device made by bonding birefringent prisms using the birefringence effect in the crystal, and this type of device is widely used in practice, and there are many reports on it. After literature search, it was found that US Patent No. 5,440,424 proposed a polarizing device made by bonding birefringent prisms. In this device, a total of seven birefringent prisms are bonded to realize their functions....

AI Technical Summary

Problems solved by technology

However, these requirements are usually difficult to fully meet in actual mechanical processing and optical applications, which inevitably reduces the performance of the device.

In addition, the design of some prisms requires the light beam to be incident from one side of the prism, and if the light path is reversed by 180 degrees (this is often the case in optical applications), the performance of the device will be lower than that of the normal incidence. big difference

In addition, the bonding of two prisms usually uses materials such as Canada gum, and the absorption of these materials also greatly limits the application range of this type of device.

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