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Multimode optical fiber three-dimensional imaging device and method based on high-speed wavefront modulation

A multi-mode fiber, three-dimensional imaging technology, applied in optics, optical components, telescopes, etc., can solve the problem of huge data storage space, and achieve the effect of high-speed scanning and imaging

Active Publication Date: 2019-03-08
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] However, in the current multimode optical fiber transmission matrix measurement system, the measured matrix corresponds to only a surface at a certain distance from the exit end face of the optical fiber, that is, the front focal plane of the objective lens (such as figure 2 The front focal plane 14 in the case of middle A), so the obtained transfer matrix can only be used to modulate the distribution of the focused spot on this plane
At the same time, the measured transmission matrix contains random factors, so it cannot be multiplied by the free-space transfer function in the frequency domain to realize the next plane (such as figure 2 The focus spot of the front focal plane 14) in the case of middle B can be controlled to move
To realize the controllable movement of the focus spot on different surfaces, it can only be realized by moving the objective lens to measure the transmission matrix of different surfaces, which brings a lot of measurement complexity and measurement error to the actual measurement process. The required The data storage space is also very large

Method used

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  • Multimode optical fiber three-dimensional imaging device and method based on high-speed wavefront modulation
  • Multimode optical fiber three-dimensional imaging device and method based on high-speed wavefront modulation
  • Multimode optical fiber three-dimensional imaging device and method based on high-speed wavefront modulation

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Embodiment 1

[0046] see image 3 In this embodiment, the multimode optical fiber three-dimensional imaging device based on high-speed wavefront modulation includes:

[0047] The laser 101 is used to emit excitation light to realize corresponding fluorescence imaging or reflective intensity imaging;

[0048] reflector 102, reflecting the laser emitted by laser 101;

[0049] The first 4F system 103 is used for beam expansion of the beam;

[0050] beam splitter 104, used to separate object light and reference light;

[0051] Mirror 105, used to reflect the object light onto the digital micromirror array 106 according to a special angle;

[0052] The digital micromirror array 106 is used to realize the wavefront modulation for the laser;

[0053] The second 4F system 107 is used for filtering on the spectrum plane;

[0054] The aperture 121 is used to filter out light other than -1 order diffracted light;

[0055] Multimode optical fiber 113, used to transmit light beams;

[0056] The f...

Embodiment 2

[0077] In this embodiment, the multimode optical fiber three-dimensional imaging device based on high-speed wavefront modulation is the same as that of Embodiment 1 except that the transmission part that transmits the light intensity information of the sample to the photodetector is different from that of Embodiment 1. The transmission part of this embodiment It is a beam splitter, that is, the dichroic mirror 110 in Embodiment 1 is changed into a beam splitter, and imaging is performed by using the intensity of reflected light, which can be more suitable for non-fluorescent samples.

[0078] The working process of this embodiment is as follows:

[0079] (1) The laser 101 emits excitation light, expands the beam through the first 4F system 103, and splits the object light and reference light by the beam splitter 104. The object light is reflected by the mirror 105 and irradiates the digital micromirror array 106 according to a special angle.

[0080] (2) Generate a hologram fo...

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Abstract

The invention discloses a multimode optical fiber three-dimensional imaging device and method based on high-speed wavefront modulation, and belongs to the field of optical fiber microscopic endoscopies. The device comprises a laser, a first beam splitter making light beams of the laser divided into object light and reference light, a measurement assembly used for measuring a transmission matrix and a photoelectric detector used for recording light intensity information of sample reflected light or sample fluorescence, a digital micromirror array modulating object light and multimode optical fiber used for transmitting the object light obtained after modulation are arranged on a light path of the object light, and a first objective lens coupling the object light obtained after modulation isarranged at an input end of the multimode optical fiber; the measurement assembly comprises a second objective lens, a second beam splitter, a camera and a computer which is in communication connection with the camera; when the transmission matrix is measured, an output end of the multimode optical fiber is connected to the second beam splitter, and by means of the measurement assembly, a three-dimensional space transmission matrix corresponding to a focal plane of the second objective lens is obtained; when a sample three-dimensional image is collected, a sample is placed at an output end ofthe multimode optical fiber.

Description

technical field [0001] The invention relates to the field of optical fiber microendoscopy, in particular to a multimode optical fiber three-dimensional imaging device and method based on high-speed wavefront modulation. Background technique [0002] A fiberoptic endoscope is an imaging device that simply and effectively combines fiber optics, tunable instruments, and telemetry visualization. When using the device, first connect the light guide tube to the corresponding light source, insert it into the area to be detected through the tube, and control the operating parts to realize the imaging of the observation area. This kind of device is widely used in medical and industrial testing due to its excellent image transmission ability and bending performance, as well as its strong resistance to electromagnetic fields and high temperature capabilities. [0003] Single-mode fiber bundle is currently the most commonly used endoscopic fiber, but in order to obtain a better imaging...

Claims

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Application Information

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IPC IPC(8): G02B23/24G02B23/26G03H1/04G03H1/08G03H1/00
CPCG02B23/2407G02B23/26G03H1/04G03H1/0866G03H2001/0038
Inventor 杨青文仲马耀光刘旭
Owner ZHEJIANG UNIV