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A device and method for calibrating the transmission axis of a polarizer

A technology of light transmission axis and polarizer, used in measuring devices, photometry, optical radiation measurement, etc., can solve the angle and inclination calibration error of PBS placement, high PBS requirements, and affect the final calibration result of the light transmission axis, etc. question

Active Publication Date: 2011-12-14
SHANGHAI INST OF TECHNICAL PHYSICS - CHINESE ACAD OF SCI
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Problems solved by technology

[0005] The purpose of the present invention is to provide a kind of device and method for accurately demarcating the transmission axis of a polarizer, which overcomes the following problems existing when utilizing PBS to demarcate the transmission axis direction: 1. The direction in which PBS itself produces linearly polarized light will affect The final calibration result in the direction of the light transmission axis has higher requirements on PBS; 2. The angle and inclination of PBS placement during the test will introduce calibration errors

Method used

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  • A device and method for calibrating the transmission axis of a polarizer
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  • A device and method for calibrating the transmission axis of a polarizer

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Embodiment Construction

[0045] The implementation examples of the method of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0046] The main devices adopted in the present invention are described as follows:

[0047] 1) Laser 1: Purchase a domestic power-tunable fiber laser with a test wavelength of 850nm;

[0048] 2) Polarizer 2: The polarizer adopts the product of Thorlabs, the model is LPVIS100, its main performance parameters: the working band is 600-1200nm; the polarization extinction ratio is 10000:1; the aperture size is 25mm, and the effective aperture is 90% of the aperture ;Polarization angle is ±20°;

[0049] 3) Rotating motor 3: One-dimensional electric rotary table produced by Shanghai Lianyi Optical Fiber Laser Equipment Factory (360-degree scale can be rotated arbitrarily), the minimum reading of the scale is 0.2 degrees, the full-step resolution of the motor is 0.0133 degrees, and the repeat positioning accuracy is less than 0.0...

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Abstract

The invention discloses an apparatus and a method for calibrating a transmission axis of a polaroid. A combination of two to-be-calibrated polaroids and two dielectrics is utilized to realize accurate calibration on a transmission axis of a polaroid; and the apparatus and the method can be applied to measurement and detection fields, wherein the fields are related to polarization and include a polarized optical system, an ellipse polarized measuring field, and a laser technology and the like. According to the method, on the basis of rotationally symmetrical principles of an axis of homology and an absorption axis of a polaroid, two measurements on a polarization angle from the front and back sides are carried out on a linearly polarized beam at any angle; and then axises of homology or absorption axises of measured polaroids can be obtained; and transmission axises of the polaroids can be determined by utilizing different characteristics of linearly polarized lights of a horizontal S and a vertical P when the linearly polarized lights reflect on interfaces of the two dielectrics, so that high precision calibration of the transmission axises of the polaroids can be realized.

Description

technical field [0001] The invention relates to a polarizer detection technology, in particular to a device and method for calibrating the light transmission axis of a polarizer. Background technique [0002] Polarization is a characteristic of light. With the deepening of the research on the polarization of light, people gradually realize the wide application prospect of polarization information, and the polarization technology has also begun to enter the practical stage. Polarization information has been gradually applied to the detection of targets. , which plays an important role in the fields of ground object remote sensing detection, atmospheric detection, underwater detection, astronomical detection, medical diagnosis, target detection, image processing and military applications; in the field of quantum communication, the polarization state of photons is used to replace classical binary codes (bit) encodes the signal, so as to realize the distribution of quantum keys ...

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Application Information

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IPC IPC(8): G01M11/02G01J1/00
Inventor 王建宇吴金才何志平舒嵘贾建军杨世骥强佳周辉姜紫庆吴永红
Owner SHANGHAI INST OF TECHNICAL PHYSICS - CHINESE ACAD OF SCI
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