CN218158571U

CN218158571U - Non-interference non-iterative complex amplitude reading optical system

Info

Publication number: CN218158571U
Application number: CN202222545934.6U
Authority: CN
Inventors: 郝建颖; 谭小地; 林枭; 任宇红
Original assignee: Fujian Pansheng Information Optics Co ltd
Current assignee: Fujian Pansheng Information Optics Co ltd
Priority date: 2022-09-26
Filing date: 2022-09-26
Publication date: 2022-12-27
Anticipated expiration: 2032-09-26

Abstract

The utility model discloses a non-interference, non-iterative complex amplitude reads optical system, including the laser instrument, the parallel subassembly of light beam, the first 1/2 wave plate, the diaphragm, the first formation of image subassembly, the first polarizer and the first beam splitter of transmission-reflection type that set gradually along incident beam propagation direction; an amplitude spatial light modulator is arranged in the transmission beam propagation direction of the first beam splitter, and a second polarizer, a second imaging component, a second 1/2 wave plate and a transmission-reflection type second beam splitter are sequentially arranged in the reflection beam propagation direction of the first beam splitter; a phase spatial light modulator is arranged in the transmission direction of the transmission light beam of the second beam splitter, and a third imaging component and a photoelectric detector are sequentially arranged in the transmission direction of the reflection light beam of the second beam splitter; the optical system can be simplified, the amplitude and phase reading speed can be improved, the reading result is accurate, stable and reliable, and the method is suitable for the fields of holographic storage, biomedical image processing, microscopic imaging and the like.

Description

Non-interference non-iterative complex amplitude reading optical system

Technical Field

The utility model relates to an optical equipment technical field especially relates to noninterference, the compound amplitude of non-iterative formula reads optical system.

Background

Phase and amplitude are two basic characteristics of light. In the fields of information storage, biomedicine, computational imaging, etc., it is often necessary to obtain both amplitude and phase information of light.

The current detector can only detect the intensity information of light, and the phase information needs to be obtained by indirect calculation through an interference method or a non-interference iterative method.

The interferometric method needs to introduce a beam of reference light to convert phase information into an interferogram, and then calculates to obtain a phase, so that the method has the disadvantages of complex optical system, unstable phase reading result and low precision.

Although the non-interferometric method does not need to introduce reference light, the system is relatively simple, but multiple iterations or multiple shooting operations are often required to obtain relatively accurate phase information. The disadvantage of the non-intrusive iterative method is therefore that the computation speed is relatively slow.

In some special fields, such as information storage and reading, real-time image processing for computational imaging, etc., requirements are imposed on the speed and precision of information reading, and it is necessary to accurately and rapidly read amplitude and phase information in a simple optical system. Therefore, a non-interference and non-iterative complex amplitude reading optical system is needed, which is mainly used for transmitting a light beam in the air for a preset distance to generate a diffraction image, can be used in combination with electronic equipment such as a computer, and realizes the detection of complex amplitude information from an intensity image based on a single diffraction image; the optical system has a simplified and reasonable structure, and is beneficial to improving the amplitude and phase reading speed.

SUMMERY OF THE UTILITY MODEL

The utility model provides a noninterference, the complex amplitude of non-iterative formula reads optical system, can overcome the interference method that obtains the phase place information usefulness of light among the prior art and the optical system that non-interference formula method exists relatively complicated, can lead to follow-up phase place reading result unstable in using, the precision is lower, defects such as the computational rate is relatively slow; the phase-shifting grating can simplify the system, improve the precision, is suitable for phase reading, and can be applied to the fields of holographic storage, biomedical image processing, microscopic imaging and the like.

The utility model provides a non-interference, non-iterative complex amplitude reads optical system, this optical system include along the laser instrument, light beam parallel assembly, the first 1/2 wave plate, the diaphragm, the first imaging assembly, the first polarizer that incident beam propagation direction set gradually and the first beam splitter of transmission-reflection type; an amplitude spatial light modulator is arranged in the transmission beam propagation direction of the first beam splitter, and a second polarizer, a second imaging component, a second 1/2 wave plate and a transmission-reflection type second beam splitter are sequentially arranged in the reflection beam propagation direction of the first beam splitter; the phase spatial light modulator is arranged in the transmission beam propagation direction of the second beam splitter, and the third imaging assembly and the photoelectric detector are sequentially arranged in the reflection beam propagation direction of the second beam splitter.

Preferably, the beam parallel assembly includes a pinhole filter and a collimating lens sequentially arranged along the incident beam propagation direction.

The utility model discloses a noninterference, the compound amplitude of non-iterative formula read optical system can reach following beneficial effect at least:

the utility model discloses a noninterference, non-iterative formula complex amplitude read optical system, for noninterference read optical system, only need propagate the preset distance with the light beam in the air, need not to set up reference light, additional lens and other optical systems during reading; the device has reasonable and compact structure, is beneficial to improving the amplitude and phase reading speed, and promotes the accuracy, stability and reliability of the reading result.

Drawings

The accompanying drawings, which are described herein, serve to provide a further understanding of the invention and constitute a part of this specification, and the exemplary embodiments and descriptions thereof are provided for explaining the invention without unduly limiting it. In the drawings:

FIG. 1 is a schematic diagram of an optical system of a non-interferometric, non-iterative complex amplitude readout optical system according to an embodiment of the present invention,

fig. 2 is a schematic diagram of complex amplitude reading in a non-interference and non-iterative complex amplitude reading method according to an embodiment of the present invention.

In the figure, 1 is a laser, 2 is a pinhole filter, 3 is a collimating lens, 4 is a first 1/2 wave plate, 5 is a diaphragm, 6 is a first relay lens, 7 is a second relay lens, 8 is a first polarizer, 9 is a first beam splitter, 10 is an amplitude spatial light modulator, 11 is a second polarizer, 12 is a third relay lens, 13 is a fourth relay lens, 14 is a second 1/2 wave plate, 15 is a second beam splitter, 16 is a phase spatial modulator, 17 is a fifth relay lens, 18 is a sixth relay lens, and 19 is a photodetector.

Detailed Description

To make the purpose, technical solution and advantages of the present invention clearer, the following description will be given with reference to the embodiments of the present invention and the accompanying drawings, in which the technical solution of the present invention is clearly and completely described. It is to be understood that the disclosed embodiments are merely exemplary of the invention, and are not intended to limit the invention to the precise embodiments disclosed. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

The technical solutions provided by the embodiments of the present invention are described in detail below with reference to the accompanying drawings.

Example 1

Referring to fig. 1, the present embodiment provides a non-interference and non-iterative complex amplitude readout optical system, which includes a laser 1, a beam parallel assembly, a first 1/2 wave plate 4, a diaphragm 5, a first imaging assembly, a first polarizer 8, and a transmission-reflection type first beam splitter 9 sequentially arranged along a propagation direction of an incident beam; an amplitude spatial light modulator 10 is arranged in the transmission direction of the transmitted light beam of the first beam splitter 9, and a second polarizer 11, a second imaging component, a second 1/2 wave plate 14 and a transmission-reflection type second beam splitter 15 are sequentially arranged in the transmission direction of the reflected light beam of the first beam splitter 9; a phase spatial light modulator 16 is disposed in the direction of propagation of the transmitted beam of the second beam splitter 15, and a third imaging element and a photodetector 19 are disposed in the direction of propagation of the reflected beam of the second beam splitter 15 in this order.

The non-interferometric, non-iterative complex amplitude readout optical system described above may be used in conjunction with electronic devices such as computers. Amplitude and phase images of complex amplitudes are generated by a computer, and experimental diffraction intensity images for corresponding are obtained through shooting by an optical system. In practical application, in the stage of neural network model application after training and verification of the neural network model is completed through a computer, for example, the diffraction intensity diagram is still shot by using an optical system and then input into the neural network model for complex amplitude reconstruction; that is, both a computer and an optical system need to be used.

Specifically, the beam parallelizing assembly includes a pinhole filter 2 and a collimator lens 3 sequentially arranged along the propagation direction of the incident beam. The diaphragm 5 functions to control the size of the beam diameter. The first imaging assembly comprises a first relay lens 6 and a second relay lens 7 arranged in sequence along the direction of propagation of the light beam. The first relay lens 6 and the second relay lens 7 constitute a 4f system. The first polarizer 8 is a horizontal polarizer. The first beam splitter 9 is a polarizing beam splitter and a non-polarizing stereo beam splitter. The second polarizer 11 is a vertical polarizer. The second imaging component includes a third relay lens 12 and a fourth relay lens 13 arranged in this order along the beam propagation direction. The third relay lens 12 and the fourth relay lens 13 constitute a 4f system. The second beam splitter 15 is a non-polarizing stereoscopic beam splitter. The third imaging assembly includes a fifth relay lens 17 and a sixth relay lens 18 arranged in this order in the beam propagation direction. The fifth relay lens 17 and the sixth relay lens 18 constitute a 4f system.

With reference to fig. 2, the non-interference and non-iterative complex amplitude reading optical system may specifically work in the following process:

the laser 1 emits laser light, for example, green laser light having a wavelength of 532 nm. The laser light passes through a pinhole filter 2 and a collimating lens 3 and is converted into parallel light with good beam quality. After the parallel light passes through the first 1/2 wave plate 4 and the diaphragm 5, the beam cross section of the parallel light is converted into the shape of a diaphragm hole of the diaphragm 5 from a circle. The first relay lens 6 and the second relay lens 7 constitute a 4f system, which has the function of imaging the diaphragm 5 onto the plane in which the spatial light modulator 10 is located. After the laser beam passes through the first polarizer 8 and the first beam splitter 9 and enters the spatial light modulator 10, the reflected light thereof passes through the first beam splitter 9 again and is reflected in a direction perpendicular to the original optical path. The spatial light modulator 10 may be an amplitude type spatial light modulator, and the liquid may be a combined phase type spatial light modulator of the first polarizer 8 and the second polarizer 11 whose polarization directions are perpendicular to each other to realize amplitude modulation of the laser beam. That is, the spatial light modulator 10 is operative to carry accurate amplitude information by loading a specific amplitude a image, and then, after the laser beam is incident on the spatial light modulator 10, it is reflected and passes through the second polarizer 11. The laser beam with amplitude information is made to pass through a third relay lens 12 and a fourth relay lens 13, and the third relay lens 12 and the fourth relay lens 13 also form a 4f system and are used for imaging the amplitude spatial light modulator 10 onto the plane where the second spatial light modulator 16 is located. After passing through a 4f system composed of a third relay lens 12 and a fourth relay lens 13, the laser beam continues to pass through a second 1/2 wave plate 14 and a second beam splitter 15, and is incident on the second beam splitter 15. The second 1/2 wave plate 14 is used to adjust the polarization state of the laser beam so as to satisfy the polarization state requirement of the phase-type spatial light modulator 16. The phase spatial light modulator 16 is used for uploading a specific phase image P to realize phase modulation of the laser beam. The laser beam with amplitude and phase information reflected from the phase type spatial light modulator 16 passes through the second beam splitter 15, is reflected in a direction perpendicular to the original optical path, and then enters the photodetector 19 through the sixth relay lens 17 and the sixth relay lens 18. The sixth relay lens 17 and the sixth relay lens 18 form a 4f system, and the function of the system is to accurately image the plane where the second beam splitter 15 is located onto the back focal plane of the sixth relay lens 18. Along the propagation direction of the laser beam, the photodetector 19 is located on the plane behind the focal plane behind the sixth relay lens 18, so that the beam located at the focal plane behind the sixth relay lens 18 has precise amplitude and phase information, and the laser beam further propagates the diffracted light after a preset distance to enter the photodetector 19 and be received by the photodetector 19, so as to obtain a diffraction pattern with light intensity variation, i.e. a diffraction intensity image I.

The utility model discloses non-interference, non-iterative formula complex amplitude read optical system in practical application, can combine the computer, realize through following step that non-interference, non-iterative formula complex amplitude read:

the method comprises the steps of building an optical system for non-interference lens-free complex amplitude diffraction reconstruction, generating amplitude and phase images by using electronic equipment such as a computer, uploading the amplitude and the phase to the optical system to obtain diffraction intensity images to build a neural network data set, building a neural network model structure, setting corresponding parameters, training and verifying the generalization of the neural network model by using the data set, and inputting any diffraction image into the neural network model to directly output the amplitude and phase images.

In the non-interference and non-iterative complex amplitude reading process, by adopting the non-interference and non-iterative complex amplitude reading optical system of the embodiment of the utility model, the amplitude and phase reading speed and accuracy can be further improved, and the device is simplified.

The above are merely examples of the present invention, and are not intended to limit the present invention. Various modifications and variations of the present invention will be apparent to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.

Claims

1. The non-interference and non-iterative complex amplitude reading optical system is characterized by comprising a laser, a light beam parallel assembly, a first 1/2 wave plate, a diaphragm, a first imaging assembly, a first polarizer and a transmission-reflection type first beam splitter which are sequentially arranged along the propagation direction of an incident light beam; an amplitude spatial light modulator is arranged in the transmission beam propagation direction of the first beam splitter, and a second polarizer, a second imaging component, a second 1/2 wave plate and a transmission-reflection type second beam splitter are sequentially arranged in the reflection beam propagation direction of the first beam splitter; and a phase spatial light modulator is arranged in the transmission beam propagation direction of the second beam splitter, and a third imaging component and a photoelectric detector are sequentially arranged in the reflection beam propagation direction of the second beam splitter.

2. The non-interferometric, non-iterative complex amplitude readout optical system of claim 1 in which the beam parallelizing component comprises a pinhole filter and a collimating lens arranged in sequence along the direction of propagation of the incident beam.

3. A non-interferometric, non-iterative complex amplitude readout optical system according to claim 1, characterized in that the first imaging assembly comprises a first relay lens and a second relay lens arranged in sequence along the beam propagation direction, the first relay lens and the second relay lens constituting a 4f system.

4. A non-interferometric, non-iterative complex amplitude readout optical system according to claim 1, characterized in that the first polarizer is a horizontal polarizer.

5. The non-interferometric, non-iterative complex amplitude readout optical system of claim 1 in which the first beam splitter is a polarizing beam splitter and a non-polarizing cube beam splitter.

6. A non-interferometric, non-iterative complex amplitude readout optical system according to claim 1, characterized in that the second polarizer is a perpendicular polarizer.

7. A non-interferometric, non-iterative, complex amplitude readout optical system according to claim 1, characterized in that the second imaging assembly comprises a third and a fourth relay lens arranged in sequence along the direction of beam propagation, the third and fourth relay lenses constituting a 4 f-system.

8. The non-interferometric, non-iterative complex amplitude readout optical system of claim 1, wherein the second beam splitter is a non-polarizing solid beam splitter.

9. A non-interferometric, non-iterative complex amplitude reading optical system according to claim 1, characterized in that the third imaging assembly comprises a fifth and a sixth relay lens arranged in sequence along the direction of beam propagation, the fifth and sixth relay lenses constituting a 4 f-system.