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Unit element beam splitting and combining interferometer

A single component, interferometer technology, applied in optical components, instruments, optics, etc., can solve the problems of difficult to read, can not take into account simplicity and readability, etc., and achieve the effect of high stability

Active Publication Date: 2021-02-23
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this type of method has certain limitations, and often cannot take into account simplicity and readability, especially when the topological charge to be measured is very large, it is not easy to read

Method used

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  • Unit element beam splitting and combining interferometer
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  • Unit element beam splitting and combining interferometer

Examples

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Effect test

Embodiment 1

[0043] A single-element beam-splitting and combining interferometer, including elements, a light beam is divided into two beams after entering the element, that is, a first beam of light 100 and a second beam of light 200, and the first beam of light 100 and the second beam of light 200 After even and odd times of reflection in the component, the two beams of light are recombined in the component after reflection, and finally emitted from the combined beam of the component.

[0044] The element includes a beam-splitting plane 300, which is a polarization beam-splitting plane 300, that is, splitting light into orthogonal polarization components.

[0045] Alternatively, the light-splitting plane 300 is a non-polarized light-splitting plane, which is an ordinary light-splitting plane, that is, it is not sensitive to polarization.

[0046] The beam splitting plane 300 divides the light beam into two paths of light, that is, the first beam of light 100 and the second beam of light ...

Embodiment 2

[0056] Based on the above-mentioned embodiment 1, the similarities will not be repeated, and the difference is that, as attached Figure 3-4 As shown, the first beam of light 100 undergoes 2 reflections in the element, and the second beam of light 200 undergoes 5 reflections in the element (including 2 reflections at the splitting plane 300 and 3 reflections at the side of the element), Ultimately the combined beam exits from the component.

[0057] The number of prism surfaces on the side of the element corresponding to the first beam of light 100 is four, namely mirror A1110, mirror A2120, mirror A3130, and mirror A4140, the angle between the mirror A1110 and the mirror A2120, the mirror A3130 and the mirror A4140 The included angles are all 154-160°, and the included angles between the mirror surface A2120 and the mirror surface A3130 are 132-138°.

[0058] Preferably, the included angle between the mirror A1110 and the mirror A2120, the included angle between the mirror A...

Embodiment 3

[0065] Based on the above-mentioned embodiment 2, construct a compact vector light field generating device, such as Figure 5 As shown, a 1 / 2 wave plate 600 is placed in front of the polarization interference prism. When the horizontally polarized vortex beam is incident on the 1 / 2 wave plate 600, the polarization direction is rotated to 2θ. According to Malius’ law, when the beam enters After the single-element beam-splitting and combining interferometer in Embodiment 2, if the beam-splitting plane 300 is polarized beam-splitting, the intensity ratio of the two beams divided inside is: cos 2 2θ sin 2 2θ. In addition, a 1 / 4 wave plate can be placed or not placed at the exit end of the component (polarization interference prism). If a 1 / 4 wave plate is placed and the optical axis direction is adjusted to 45°, the two beam components combine and exit After that, they are respectively modulated into left and right circularly polarized light. At this time, two left and right circ...

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Abstract

The invention relates to a unit element beam splitting and combining interferometer which comprises an element, a light beam enters the element and then is split into two beams of light, namely a first beam of light and a second beam of light, the first beam of light and the second beam of light are respectively reflected for even times and odd times in the element, and the two beams of light arecombined again in the element after being reflected and finally emitted from the element. The problems that an existing interferometer is composed of multiple elements, quite complex, insufficient instability and the like are solved, beam splitting and beam combining can be achieved in the element at the same time through different reflection times and parity, and the interferometer has the advantages of being compact, stable, high in integration degree, high in efficiency, resistant to high power and the like. The interferometer can replace a traditional interferometer composed of multiple elements in many application scenes, for example, but not limited to vector light field generation, vortex beam topological charge measurement, quantum optical logic gates and the like, and has wide potential application.

Description

technical field [0001] The invention relates to the technical field of interferometers and prism devices, in particular to a single-element beam splitting and combining interferometer. Background technique [0002] The functions of existing prisms are usually light splitting, changing the direction of propagation, dispersion, polarization splitting, etc. A prism that realizes the dual process of "beam splitting + beam combining" in a single prism is still blank. In light field regulation and application, the most common means and requirements are: first split the beam (splitting the amplitude or splitting the wavefront), and then modulate the two beams separately before combining the beams for output. The most commonly used method is to use various interference optical paths: such as Sagnac interferometer, Mach-Zehnder interferometer, Michelson interferometer, etc. However, the use of this type of interferometer often requires multiple optical elements to form an optical p...

Claims

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Application Information

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IPC IPC(8): G02B27/10G02B27/28G02B5/04
CPCG02B27/10G02B27/283G02B5/04
Inventor 汪喜林任志成王慧田
Owner NANJING UNIV
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