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Transmissive dual-frequency laser differential interferometry device and method with adjustable shear amount

A dual-frequency laser, differential interference technology, applied in the optical field, can solve the problem of unadjustable shearing amount, and achieve the effect of clear interference pattern and strong coherence

Active Publication Date: 2021-02-02
NORTH CHINA UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For this reason, the splitting surface of the Nomarski prism is located on the front focal plane of the lens, which also makes the shearing amount of the two beams fixed and not adjustable

Method used

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  • Transmissive dual-frequency laser differential interferometry device and method with adjustable shear amount
  • Transmissive dual-frequency laser differential interferometry device and method with adjustable shear amount
  • Transmissive dual-frequency laser differential interferometry device and method with adjustable shear amount

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Embodiment 1

[0031] refer to figure 1 , the preferred embodiment 1 of the present invention provides a transmissive dual-frequency laser differential interferometry device with adjustable shear, which includes the following components:

[0032] Dual-frequency laser 101: A transverse Zeeman frequency-stabilized dual-frequency He-Ne laser with a frequency difference of 3MHz can be used to emit a pair of linearly polarized light with a wavelength of 633nm and orthogonal polarizations, that is, the beam contains both p and s polarization components , the beam diameter is about Ф4mm;

[0033] The first Wollaston prism 102 and the second Wollaston prism 103: the wedge angle is 0.28°;

[0034] The first mirror 105, the second mirror 106, the quarter-wave plate 107, the polarizer 108 and the CCD detector 109 adopt high-precision devices commonly used in the market;

[0035] The sample 104 to be tested is an ordinary multimode optical fiber with a diameter of 125 μm and a core diameter of about 6...

Embodiment 2

[0040] refer to figure 1 , the preferred embodiment 2 of the present invention provides a method for transmission-type dual-frequency laser differential interferometry with adjustable shear amount based on the device described in embodiment 1, which includes the following steps:

[0041] Step 1: Turn on the dual-frequency laser, so that the dual-frequency laser emits a pair of mutually orthogonal P and S linear polarizations;

[0042] Step 2: By moving the second Wollaston prism back and forth to adjust the two parallel beams obtained after the P and S linearly polarized light passed through the first Wollaston prism and the second Wollaston prism as described in step 1 the shear amount of light;

[0043] Step 3: Use the CCD detector to record the interference pattern;

[0044] Step 4: Rotate the polarizer, modulate the phase difference between the original P-polarized light and S-polarized light, use the CCD detector to separate the interference patterns of different polari...

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Abstract

The invention relates to a transmissive dual-frequency laser differential interference measurement device and method with adjustable shear amount. The device and method disclosed in the present invention use two Wollaston prisms instead of Nomarski prisms and lenses, and moving the second Wollaston prism can make the shearing amount of the beam adjustable within a certain range, so as to adapt to the measured phase in different situations The measurement requirements of the object; and the dual-frequency laser is used as the light source, the coherence is stronger, and the interference pattern formed is clearer.

Description

technical field [0001] The invention relates to the field of optical technology, in particular to a transmissive dual-frequency laser differential interferometry device and method with adjustable shear. Background technique [0002] In the middle of the 20th century, differential interference contrast microscopy was invented, which has a unique effect in observing the surface morphology of materials and the phase information of transparent objects. In the mid-1960s, Nomarski improved the prism so that it can be used in the field of high-magnification measurement. In the following decades, Delbert, Hartman, etc. proposed a complete quantitative measurement theory, which enabled differential interference contrast technology to achieve quantitative measurement. In recent years, with the improvement of corresponding technologies such as CCD and acquisition card, differential interference contrast measurement technology has been widely used. [0003] The typical differential in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B9/02
CPCG01B9/02015
Inventor 陈强华孔祥悦孙启国吕洪波何广平司丽娜豆照良祖岩朱炜杨延竹李艳红柴娟芳
Owner NORTH CHINA UNIVERSITY OF TECHNOLOGY
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