Parallel prism phase shifter used for phase-shifting interferometry

A parallel prism, phase-shifting interference technology, which is applied in the field of photonics and engineering detection, and traditional optics, can solve the problems of high experimental environment requirements and low experimental stability of phase shifters, and achieves high modulation effect precision and structural device. The effect of simplicity, great development prospects and market development space

Active Publication Date: 2014-09-10
ZHEJIANG UNIV
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Problems solved by technology

[0003] Aiming at the shortcomings of the phase shifter of the phase shifting interference technology, such as high requirement

Method used

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  • Parallel prism phase shifter used for phase-shifting interferometry
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  • Parallel prism phase shifter used for phase-shifting interferometry

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Embodiment Construction

[0010] Below in conjunction with accompanying drawing, the present invention is described in further detail:

[0011] Parallel prism phase shifter principle:

[0012] According to Maxwell's theory and Fresnel's law, when the laser is greater than the critical angle θ c When the incident angle θ is emitted from the glass to the air, total reflection will occur on the glass-air interface. At this time, the phases of the p-light and s-light of the reflected light will change differently, which is called the phase change value of the p-light and s-light The difference is the phase modulation angle under the incident angle θ. The magnitude of the phase modulation angle is related to the refractive index of the glass, the incident angle θ and the number of total reflections. When other parameters are fixed, changing the incident angle can change the size of the phase modulation angle.

[0013] The interference light intensity of p light and s light is:

[0014] I(p,s)=I a +I b...

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Abstract

The invention discloses a parallel prism phase shifter used for phase-shifting interferometry. The parallel prism phase shifter of the invention comprises parallel prisms, a stepper motor, a high-reflection mirror and a beam splitter. Five parallel prisms are fixed on a platform of the stepper motor as different deviation angles relative to an incident light beam. The deviation angle of each prism is determined by the phase difference of p light and s light which are to be caused by the deviation angle. Incident light is divided in two beams of light through the beam splitter; one beam of light is emitted to the parallel prisms, and is subjected to total internal reflection of the parallel prisms, and reaches the high-reflection mirror, and is made to be vertical to an emergent light path through adjusting the high-reflection mirror; and after being reflected by the high-reflection mirror, the light is returned according to original paths; and finally, the light is separated out from the beam splitter to form modulated emergent light. The parallel prism phase shifter used for phase-shifting interferometry of the invention has the advantages of being simple, high stability, high precision of a modulation effect, low cost and long service life.

Description

technical field [0001] The invention belongs to the cross technical fields of traditional optics, photonics and engineering detection, and specifically relates to a prism phase shifter applied in phase shifting interference technology. Background technique [0002] Phase-Shifting Interferometry (Phase-Shifting Interferometry, hereinafter referred to as PSI) can be used to extract phase difference information between signal light and reference light from an interference pattern. The present invention uses this principle to design a prism phase shifter to detect the phase difference of the system. Contents of the invention [0003] Aiming at the shortcomings of the phase shifter of the phase shifting interference technology, such as high requirements on the experimental environment and low experimental stability, the invention invents a brand new prism phase shifter. [0004] The technical scheme adopted in the present invention is: [0005] The invention includes a parall...

Claims

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Application Information

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IPC IPC(8): G02B26/06G01J9/02
Inventor 江丽叶高翱杨薇何赛灵
Owner ZHEJIANG UNIV
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