System and method of utilizing two-step phase-shifting coaxial holographic technology to realize 90 DEG phase shift and calibration

A holographic technology and calibration system technology, which is applied in the field of 0° phase shift and calibration system, can solve the problems of 90° phase shift and calibration methods that have not been reported in literature, and achieve the effect of simple structure, high adjustment accuracy and less optical components

Active Publication Date: 2016-10-12
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the 90° phase shift and calibration method in the two-step phase shift coaxial holography technology has not been reported in the literature

Method used

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  • System and method of utilizing two-step phase-shifting coaxial holographic technology to realize 90 DEG phase shift and calibration
  • System and method of utilizing two-step phase-shifting coaxial holographic technology to realize 90 DEG phase shift and calibration
  • System and method of utilizing two-step phase-shifting coaxial holographic technology to realize 90 DEG phase shift and calibration

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Embodiment 1

[0026] see Figure 1-Figure 4 , the two-step phase-shifting coaxial holographic technology realizes 90° phase shifting and alignment system, including a laser (1), a beam expander collimator (2), first and second two beam splitting prisms (3, 9) , the first and second mirrors (4, 5), the first and second two glass slides (7, 8), a lens (6), a CCD image receiving system (10) and a computer (11), it is characterized in that the optical path of formation is: the light beam that described laser (1) sends is divided into two paths after the beam expander collimator (2) and the first dichroic prism (3): one path passes through the first reflector (4) and the first slide glass (7) arrive at the second dichroic prism (9), and another path passes through the second slide glass (8), the second reflector (5) and lens (6) to reach the second dichroic prism (9), the output beam of the second dichroic prism (9) reaches the image receiving system (10) of the CCD, and the output of the image...

Embodiment 2

[0028] 2. This two-step phase-shifting coaxial holographic technology realizes 90° phase shifting and calibration method, and adopts the above-mentioned system for operation. It is characterized in that the operation steps are as follows:

[0029] 1. To build a Mach-Zehnder interference system, add the first slide glass (7) to the first beam of parallel light waves (1) in the optical path as the reference light wave, and add the first slide glass (7) to the second beam of parallel light waves (3) in the optical path as the object A second glass slide (8) is added to the light wave. The added glass slides (7, 8) are standard glass slides with a thickness of 2mm. The range does not change;

[0030] 2. The first slide glass (7) in the reference optical path is fixed on a high-precision rotating platform, and the center of the first slide glass (7) is required to be on the rotation axis of the rotating platform, and a lens is added to the object optical path (6), make the plane w...

Embodiment 3

[0036] Such as figure 1 As shown, this embodiment mainly includes a laser, a beam expander collimator, two mirrors, two beam-splitting prisms, two glass slides, a lens, and a CCD (Charge-coupled Device, Chinese full name: charge-coupled device) An image receiving system, a computer, wherein:

[0037] Laser 1, emitting a laser light source;

[0038] Beam expander collimator 2, which receives the beam emitted by the laser and converts it into parallel light;

[0039] The first dichroic prism 3 , the parallel light coming out from the beam expander collimator 2 reaches the first dichroic prism 3 and is split into two parallel beams of equal intensity (1) and (3). The first beam of parallel light (1) continues to propagate as the reference light. The second beam of parallel light (3) continues to propagate as object light;

[0040] The first reflector 4 is used to reflect the reference light transmitted by the first beam of parallel light (1) onto the slide glass 7;

[0041] T...

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Abstract

The invention relates to a system and method of utilizing the two-step phase-shifting coaxial holographic technology to realize 90 DEG phase shift and calibration. The method comprises: establishing a mach-zehnder double beam plane quasi coaxial holographic optical path system, and separately adding a standard glass slide into an object optical path and a reference light path; adding a condensing lens into the object optical path to converge with the plane of the reference light path to form spherical interference fringes; the spherical interference fringes being distributed in a Sinc function, fine tuning a rotating platform to allow the center of a Sinc function distribution curve to be a maximum value; continuing fine tuning the rotating platform, allowing the center of a sampled Sinc function distribution curve to be a minimum value; and removing the condensing lens in the object optical path, placing a tested sample, and marking according to twice scale values of the rotating platform so as to collect two holograms with 90 DEG phase shift. The recording device referred in the method has the characteristics of less optical elements, simple structure, convenient operation, high adjusting precision, and low cost, and can realize 90 DEG phase shift and calibration in the two-step phase-shifting coaxial holographic technology.

Description

technical field [0001] The invention relates to a system and method for realizing 90° phase shift and calibration in two-step phase shift coaxial holography technology. Background technique [0002] Phase-shift digital holography is a digital holographic technology developed by combining phase-shifting technology with digital holographic technology. During the recording process of the hologram, the phase of the reference light relative to the object light is changed to record multiple phase-shifted holograms, and then the recorded holograms are processed and numerically reconstructed using the corresponding phase-shift algorithm and digital reconstruction algorithm to restore the measured The complex amplitude distribution of the object and realize the quantitative observation. Through phase-shift operation, phase-shift digital holography can effectively solve the interference problem of zero-order and conjugate images in holographic reconstruction in the case of coaxial re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03H1/12G03H1/04
CPCG03H1/041G03H1/12
Inventor 周文静郑财富吴煜
Owner SHANGHAI UNIV
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