Optical phase put-off precision measurement method and system thereof

Abstract

The invention discloses an optical phase delay precision measuring method and a system thereof. The system of the invention comprises a laser, a polarizer, a photo-modulator, a modulation signal source, a measuring phase retarder, a phase compensator, a polarization analyzer, an optical detector and a result output unit. The method of the invention is as follows that the optical modulator is added into a light path for optical modulation of detection polarized light and then modulation polarized light is generated; a result display unit realizes conversion from measurement of direct current zero point to measurement of alternate current zero point after conducting filtering process of the received signal, therefore, the position of an extreme point can be determined accurately and the measuring precision can be improved. The measurement of the invention is simple and convenient and the result is accurate and reliable, meanwhile, the precision is up to lambada / 300; the invention is suitable for production of a wave plate and other optical delay devices and detection of the product in the sales department.

Description

technical field [0001] The invention relates to an optical phase delay precision measurement method and system thereof, in particular to an optical phase delay precision measurement method and system suitable for measuring optical delay devices such as wave plates, and belongs to the technical field of optical measurement. Background technique [0002] Due to the continuous improvement of industrial production technology, people have put forward higher and higher requirements for the accuracy of devices. Optical instruments have been widely used for their high precision, and more and more attention has been paid to the precision measurement of optical devices. In terms of phase delay measurement of optical devices, the existing precision measurement system adopts beam splitting differential automatic measurement of wave plate phase delay (Hao Dianzhong, Song Lianke, Automatic beam splitting differential measurement of wave plate phase delay, Optoelectronics. Laser , 16(5), 2...

AI Technical Summary

Problems solved by technology

[0007] 1. They are all indirect measurement methods. First measure the rotation angle of the compensation device when the extreme point appears, and then convert it into related phase information. The measurement error is large, the mechanism is complicated, and the instrument cost is high;

[0008] 2. The measurement results are greatly affected by the installation and adjustment errors of the instrument such as collimation and coaxiality;

[0009] 3. When measuring the light intensity at the extreme point, the beam-splitting differential automatic measurement system of the wave plate phase delay is not modulated, and directly measures the light intensity of the DC dark spot, and the measurement accuracy is low; the precision measurement system of the wave plate phase delay adds one The rotatable mechanical-optical optical modulator has a complex structure, high requirements for assembly and adjustment, and large errors

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