Multi-slilt filtering double slit interferometer

A technology of double slit interference and interference fringes, which is applied in the field of optical interference, can solve the problems of weak interference fringes, weak coherent light intensity, and long-term exposure, and achieve the effect of reducing difficulty and cost.

Inactive Publication Date: 2009-06-17
INST OF HIGH ENERGY PHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

This is because in the experiment, although a single slit can be used to obtain coherent light from incoherent light, this method has to filter out most of the inconsistent light, and the intensity of the coherent light obtained is very weak, so the resulting interference The fringes are also very weak, requiring a longer exposure time to record the double-slit interference fringes

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Embodiment Construction

[0054] Figure 4 A schematic diagram of the setup of a multi-slit filtering double-slit interferometer is shown. This device can use ordinary visible light sources, and consists of three screens, the first screen Σ S It is a multi-slit filter screen, on which there are multiple narrow slits at equal intervals parallel to each other (the number of slits is more than two, theoretically speaking, the more slits, the stronger the intensity of the interference fringes, there is no limit), the function is to convert ordinary Incoherent light illumination becomes multiple independent coherent light illuminations; the second screen Σ is a double-slit filter screen with double slits on it to produce a pair of coherent light sources with a fixed phase difference, and the wavelets they emit The superposition forms an interference field. The third screen ∏ is the receiving screen. When the position of the multi-slit, double-slit and receiving screen satisfies a certain geometric relatio...

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Abstract

The invention relates to a two-slit interferometer with a multi-slit filter, and is an improvement based on the Young's two-slit interferometer. A single-slit filter in the Young's two-slit interferometer is changed into a multi-slit filter, the multiple slits are employed to divide an incoherent light source into a plurality of independent coherent slit light sources, wherein, each slit can be employed to perform a two-slit interference experiment independently; when the positions of the multiple slits, the two slits and interference fringes satisfy a certain geometrical relation, the positions of the two-slit interference fringes generated by various slit light sources can be superposed, and the obtained two-slit interference fringe contrast is much higher than the Young's two-slit interference fringe contrast. The two-slit interferometer with the multi-slit filter can simply and facilitate the two-slit interference experiment by using a common visible light source, thus reducing the cost of the two-slit interference experiment and measuring the refractive index of materials.

Description

technical field [0001] The invention relates to the technical field of optical interference, and replaces single-slit filtering with multi-slit filtering, so that the contrast of obtained double-slit interference fringes is much higher than that of Young's double-slit interference fringes. Background technique [0002] In 1801, Thomas Young proposed Young's experiment, which has an important position in the history of physics, that is, the double-slit (hole) interference experiment of the split wave front. figure 1 It is a schematic diagram of the principle of Young's interference experiment. The single slit S is used to filter out some coherent light from the incoherent light. The double slits S1 and S2 are located on the wavefront of S. According to Huygens' principle, S1 and S2 can be as two new wave sources. Since S1 and S2 are two secondary light sources on the cylindrical wave surface emitted by the same point light source S, S1 and S2 are a pair of coherent light sou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/45G01J3/45G02B27/00
Inventor 黄万霞袁清习朱佩平吴自玉
Owner INST OF HIGH ENERGY PHYSICS CHINESE ACAD OF SCI
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