Alignment method for optical axis of compound wave plate and device for same

Abstract

The present invention discloses an alignment method for the optical axis of a compound wave plate and a device for the same. Two wafers of a compound wave plate to be aligned are arranged on a bracket, and then are mounted on a fixed wave plate chuck and a rotary wave plate chuck respectively; light emitted from a light source forms linearly polarized light after passing through a polarizer; after passing through the compound wave plate to be aligned, the linearly polarized light become changed in the polarization state; according to the intensity signal of transmitted beam detected by a detector, the variation amplitude of the phase delay fluctuation quantity of the compound wave plate to be aligned can be obtained further; the relative magnitude of the variation amplitude of the phase delay fluctuation quantity is compared; and the rotary wave plate chuck is controlled to rotate through an electric control rotary table until the optical axis of the compound wave plate is aligned to be in the required precision range. The device comprises the light source, the polarizer, the fixed wave plate chuck, the rotary wave plate chuck, a rotary polarization analyzer, the detector, the electric control rotary table, a computer, a stepping motor and an electric control rotary table controller. The method can align the optical axis of a compound wave plate with high precision, the device is simply equipped, and the operation is simple.

Description

technical field [0001] The invention belongs to the field of design and manufacture of optical instrument components, and in particular relates to a method and device for aligning the optical axis of a composite wave plate, which is suitable for precise alignment and calibration of the optical axes of two or more wafers in the compound wave plate. Background technique [0002] Wave plate (also can be referred to as chip. In the present invention, we claim that the wave plate that is made up of two or more wafers is a compound wave plate, and the single wave plate that claims to form a compound wave plate is a chip, to show difference. In not When making a special distinction, the composite wave plate and the wafer are collectively referred to as the wave plate.) is an optical element commonly used in the field of optical instrument design and optical measurement, which can make the two perpendicular components of polarized light produce additional optical path difference (or ...

AI Technical Summary

Problems solved by technology

Although the alignment method proposed by Collins et al. has higher alignment accuracy than the traditional manual alignment method, the alignment process of the composite wave plate is relatively complicated, and the final alignment accuracy has a greater correlation with the experience of the operator. sex

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