Device and method for detecting characteristics of phase retarder with light source polarization and dynamic feedback

Abstract

The invention relates to a device for detecting characteristics of a phase retarder with light source polarization and dynamic feedback and a method thereof, and the device comprises a light source, a polarizer, an analyzer, a first turntable and a second turntable, all which are coaxially arranged, the to-be-detected device and the analyzer are respectively fixed in the hollow structures of the first and second turntables, through a polarization-maintaining light divider, incident lights are divided into reflected lights and transmission lights all which are the same as the incident lights in polarization, the rear end of the reflected light signal from the polarization-maintaining light divider is provided with a second photoelectric detector, the transmission light signal of the polarization-maintaining light divider is received by a first photoelectric detector on the rear end of the analyzer, a first motor and a second motor are respectively connected with the first turntable and the second turntable; a feedback control system is connected with the first photoelectric detector, the second photoelectric detector, the first motor and the second motor, the first photoelectric detector and the second photoelectric detector are connected with the feedback control system, detected light signals are converted into electrical signals which are transmitted to the feedback control system, according to the input electrical signals, phase delay parameters and relevant polarization loss parameters of the to-be-detected device are calculated by the feedback control system to search for the fast axis of the device; the device is convenient and efficient in use.

Description

technical field [0001] The invention belongs to the field of polarization optical detection, in particular to a phase retarder characteristic detection device and method which are not affected by changes in the polarization state of a light source and can simultaneously detect the dynamic feedback of the polarization state of a birefringent device. The invention belongs to the field of communication. Background technique [0002] Birefringent devices made of birefringent materials, such as wave plates or phase retarders (or phase compensators), are basic optical components widely used in optical experiments and optical instruments. In principle, any material with birefringence effect can be used to make birefringent devices, such as crystal phase retarders and liquid crystal phase retarders made of birefringent crystals such as quartz, calcite, magnesium fluoride or mica, etc. Retarders, and magnetic liquids, W sheets, etc. under the action of an external magnetic field. Bu...

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Problems solved by technology

[0003] In the existing methods of measuring the characteristics of birefringent devices, for the convenience of modeling and measurement analysis, the light source is usually regarded as a natural light source, that is, the degree of polarization of the light signal emitted by the light source is regarded as 0; but in fact, the common natural light source (such as xenon tungsten lamps, halogen lamps, etc.) The degree of polarization is usually about 10%, and because the polarization state of the input light changes randomly with time, the output photocurrent will also fluctuate randomly, which leads to random errors in the measurement results and affects the measurement the accuracy of

However, in the existing measurement methods, there is no detection scheme for the phase delay and PDL characteristics of the birefringent device that can simultaneously perform feedback control of the polarization fluctuation of the light source

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