Real-time holographic system and real-time optical reconstruction method

Abstract

The present disclosure provides a real-time holographic system and a real-time optical reconstruction method, which relate to the field of holographic technology. The system comprises: a first laser, adapted to generate nanosecond pulse light; a first beam splitter, adapted to split the nanosecond pulse light into reference light and detection light, the detection light being incident on an object to be measured and generating object light having information about the object to be measured; a reconstruction light timing module, adapted to generate reconstruction light having timed femtosecond pulse information; a dichroic mirror, adapted to generate combined light based on the incident reference light and reconstruction light; a holographic dry plate, adapted to receive the combined light and object light, so that the reference light and object light in the combined light interfere on the holographic dry plate to form a phase grating, thereby recording optical information; and a multi-frame imaging module, adapted to receive the reconstruction light and form a diffraction wave based on the phase grating, thereby reading the optical information with a time resolution of the order of picoseconds.

Description

Technical Field

[0001] At least one embodiment of the present disclosure relates to the field of holography technology, and in particular to a real-time holography system and a real-time optical reconstruction method. Background Art

[0002] Holography, combined with pulsed laser technology, is being applied to the study of ultrafast events. In the field of laser plasmas, obtaining information about plasma evolution at different times requires multi-frame optical reconstruction. This multi-frame reconstruction is achieved using pulsed light multiplexing techniques. For example, spatial multiplexing involves recording holograms at different times on different locations on a holographic plate. Spatial multiplexing requires the object being recorded to change position rapidly, making it unsuitable for laser plasmas. For example, angular multiplexing involves the propagation of object light pulses in the same direction, while reference light pulses at different times propagate in different directions, forming holograms at multiple angles on the holographic plate. Angular multiplexing can be applied to laser plasmas, but the number of reconstructed frames is proportional to the number of angular minutes. A greater number of reconstructed frames increases the complexity of the optical path, thus limiting the number of reconstructed frames. Furthermore, to achieve high temporal resolution, pulses must be as short as picoseconds, making it difficult to adjust the optical path lengths between the object and reference beams. This difficulty is exacerbated by the complexity of the optical path.

[0003] In addition, holographic dry plates are the key to holographic technology. In related technologies, the material of holographic dry plates is silver halide photosensitive emulsion, which requires chemical treatments such as development and fixing after exposure, and cannot achieve real-time reconstruction. Summary of the Invention

[0004] In view of this, the present disclosure provides a real-time holographic system and a real-time optical reconstruction method.

[0005] According to a first aspect of the present disclosure, a real-time holographic system is provided, comprising a first laser 1, adapted to generate nanosecond pulse light; a first beam splitter 2, adapted to split the nanosecond pulse light into reference light and detection light, the detection light being incident on an object to be measured 5 and generating object light having information about the object to be measured; a reconstruction light timing module 200, adapted to generate reconstruction light having timed femtosecond pulse information; a dichroic mirror 3, adapted to generate a combined beam based on the incident reference light and reconstruction light; a holographic dry plate 7, adapted to receive the combined beam and object light, so that the reference light and the object light in the combined beam interfere on the holographic dry plate to form a phase grating, thereby recording optical information; the holographic dry plate 7 is further adapted to receive the reconstruction light and form diffraction waves based on the phase grating, thereby reading the optical information with a temporal resolution of the order of picoseconds; and a multi-frame imaging module 300, adapted to receive the diffraction waves and obtain reconstructed images of multiple frames of optical information, thereby achieving real-time holography.

[0006] According to an embodiment of the present disclosure, the holographic dry plate is made of a semiconductor thin slice of gallium arsenide grown by low-temperature molecular beam epitaxy to achieve a time resolution of the order of picoseconds.

[0007] According to an embodiment of the present disclosure, the holographic dry plate is adapted to form interference fringes in response to interference between the reference light and the object light on the holographic dry plate. The gallium arsenide generates a distribution of photogenerated carriers corresponding to the interference fringes within a femtosecond time scale to form the phase grating. The photogenerated carriers complete recombination within a picosecond time scale, so that the phase grating achieves an update rate of the picosecond level.

[0008] According to an embodiment of the present disclosure, the above-mentioned reconstruction light timing module includes: a second laser 8, which is suitable for generating femtosecond pulse light synchronously with the above-mentioned first laser; a glass rod 9, which is suitable for performing wavelength-division time sequencing on the above-mentioned femtosecond pulse light; and a delay crystal 10, which is suitable for performing polarization-division time sequencing on the femtosecond pulse light that has been wavelength-division time sequenced to obtain the above-mentioned reconstruction light.

[0009] According to an embodiment of the present disclosure, the multi-frame imaging module includes: a displacement crystal 11, adapted to receive the diffracted waves and output ordinary light and extraordinary light; a plurality of beam splitters 12, adapted to obtain at least one beam of sub-ordinary light and at least one beam of sub-extraordinary light based on the ordinary light and the extraordinary light; and at least one imaging group, adapted to obtain multiple frames of the reconstructed image based on a group of the sub-ordinary light and the sub-extraordinary light, respectively.

[0010] According to an embodiment of the present disclosure, each of the above-mentioned imaging groups includes: a filter 13, which is suitable for outputting imaging ordinary light with a predetermined wavelength in the above-mentioned sub-ordinary light and imaging extraordinary light with a predetermined wavelength in the above-mentioned sub-extraordinary light based on a group of the above-mentioned sub-ordinary light and the above-mentioned sub-extraordinary light; a camera 14, which is suitable for imaging the above-mentioned imaging ordinary light to obtain a first frame of the above-mentioned reconstructed image; and imaging the above-mentioned imaging extraordinary light to obtain a second frame of the above-mentioned reconstructed image; wherein the predetermined wavelengths of the imaging ordinary light and the imaging extraordinary light outputted from the filters of different above-mentioned imaging groups are different.

[0011] According to an embodiment of the present disclosure, the above-mentioned shift crystal obtains the above-mentioned ordinary light and the above-mentioned extraordinary light based on the above-mentioned polarization time serialization; the above-mentioned filter obtains imaging ordinary light and imaging extraordinary light of different predetermined wavelengths based on the above-mentioned wavelength time serialization.

[0012] According to an embodiment of the present disclosure, imaging ordinary light and imaging extraordinary light of different predetermined wavelengths correspond to obtaining the above-mentioned reconstructed images at different moments.

[0013] According to an embodiment of the present disclosure, the system further includes: a reflector 4, adapted to reflect the detection light toward the object to be measured to obtain the object light; and a third beam splitter 6, adapted to reflect the object light from the object to be measured toward the holographic dry plate, and transmit a combined beam of the reconstruction light and the reference light toward the holographic dry plate.

[0014] According to another aspect of the present disclosure, a real-time optical reconstruction method is provided.

[0015] According to the real-time holographic system and real-time optical reconstruction method of the disclosed embodiments, time-sequential reconstruction light is used to generate multi-frame reconstructed images, enabling continuous observation of ultrafast events at multiple moments. Nanosecond pulses serve as the basis for the object and reference beams, facilitating interference between the two beams on the holographic plate and reducing the difficulty of optical path adjustment. Phase gratings generated by the holographic plate, with a picosecond response rate, enable ultrafast recording of ultrafast events. By combining time-sequential femtosecond pulse reconstruction light, real-time reconstruction of the reconstructed image is also possible. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The above and other objects, features and advantages of the present disclosure will become more apparent through the following description of the embodiments of the present disclosure with reference to the accompanying drawings, in which:

[0017] Figure 1 Schematically shows a principle diagram of a real-time holographic system according to an embodiment of the present disclosure;

[0018] Figure 2 A schematic diagram schematically illustrates the principle of a reconstruction light timing module of a real-time holographic system according to an embodiment of the present disclosure; and

[0019] Figure 3 The schematic diagram schematically shows the principle of a multi-frame imaging module of a real-time holographic system according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0020] In order to make the objectives, technical solutions and advantages of the present disclosure more clearly understood, the present disclosure is further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0021] The terms used herein are only for describing specific embodiments and are not intended to limit the present disclosure. The terms "comprise," "include," etc. used herein indicate the presence of the features, steps, operations, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, or components.

[0022] All terms used herein, including technical and scientific terms, have the meanings commonly understood by those skilled in the art, unless otherwise defined. It should be noted that the terms used herein should be interpreted as having a meaning consistent with the context of this specification and should not be interpreted in an idealized or overly rigid manner.

[0023] When expressions such as “at least one of A, B, and C, etc.” are used, they should generally be interpreted in accordance with the meaning commonly understood by those skilled in the art. For example, “a system having at least one of A, B, and C” should include but is not limited to systems having A alone, B alone, C alone, A and B, A and C, B and C, and / or A, B, and C, etc. When expressions such as “at least one of A, B, or C, etc.” are used, they should generally be interpreted in accordance with the meaning commonly understood by those skilled in the art. For example, “a system having at least one of A, B, or C” should include but is not limited to systems having A alone, B alone, C alone, A and B, A and C, B and C, and / or A, B, and C, etc.

[0024] It should also be noted that directional terms such as "upper," "lower," "front," "back," "left," and "right" mentioned in the embodiments are merely references to the directions in the accompanying drawings and are not intended to limit the scope of protection of this disclosure. Throughout the drawings, identical elements are represented by identical or similar reference numerals. Conventional structures or configurations will be omitted where they may cause confusion in understanding this disclosure.

[0025] The technical problems in related technologies mainly include: the holographic optical path using angle multiplexing technology of pulsed light is complex; the equal optical path adjustment is difficult due to the use of short pulses; the number of reconstructed frames is limited due to the limitation of angular components; the holographic dry plate made of silver halide photosensitive emulsion needs to be chemically treated after exposure, and real-time reconstruction is impossible.

[0026] The present disclosure provides a real-time holographic system and a real-time optical reconstruction method, in order to solve the above technical problems.

[0027] Figure 1 The schematic diagram schematically shows the principle of a real-time holographic system according to an embodiment of the present disclosure.

[0028] like Figure 1 As shown, the real-time holographic system includes a recording module 100, a reconstruction light timing module 200 and a multi-frame imaging module 300. The recording module 100 includes a first laser 1, a first beam splitter 2, a dichroic mirror 3 and a holographic dry plate 7.

[0029] According to an embodiment of the present disclosure, the first laser 1 is adapted to generate nanosecond pulse light. The first beam splitter 2 is adapted to split the nanosecond pulse light into reference light and detection light, which is incident on the object to be measured 5 and generates object light having information about the object to be measured. The reconstruction light timing module 200 is adapted to generate reconstruction light having timed femtosecond pulse information. The dichroic mirror 3 is adapted to generate a combined beam based on the incident reference light and reconstruction light. The holographic dry plate 7 is adapted to receive the combined beam and the object light, so that the reference light and the object light in the combined beam interfere on the holographic dry plate 7 to form a phase grating, thereby recording optical information; the holographic dry plate 7 is also adapted to receive the reconstruction light and form a diffraction wave based on the phase grating, thereby reading the optical information with a time resolution of the order of picoseconds. The multi-frame imaging module 300 is adapted to receive the diffraction wave, obtain a plurality of reconstructed images of optical information, and thereby realize real-time holography.

[0030] According to an embodiment of the present disclosure, in a plasma experiment, another pulsed laser beam is focused onto the object to be measured 5 to generate plasma. The plasma will evolve rapidly and change in size, for example, expanding outward.

[0031] In one example, the nanosecond pulse light can have a wavelength of 532 nm and is split into reference light and detection light after passing through the first beam splitter 2. When the object 5 to be measured is ablated by another laser to generate plasma, the detection light is incident on the object 5 to be measured, generating object light that carries plasma information. The reference light and object light interfere on the surface of the holographic dry plate 7, forming interference fringes. The refractive index of the holographic dry plate 7 changes, forming a phase grating, thereby optically recording the plasma information.

[0032] In one example, a pulsed beam with a shorter wavelength can be used as the basic pulse for the object light and the reference light, for example, a laser with a wavelength of 266 nm, which can enter a region with a higher density of the plasma.

[0033] According to the embodiments of the present disclosure, time-sequential reconstruction light is used to generate multi-frame reconstructed images, enabling continuous observation of ultrafast events at multiple moments. Using nanosecond pulses as the basis for the object and reference beams makes interference between the two beams on the holographic plate easier, reducing the difficulty of optical path adjustment. The phase grating generated by the holographic plate, which has a response rate on the order of picoseconds, enables ultrafast recording of ultrafast events. By combining time-sequential femtosecond pulse reconstruction light, real-time reconstruction of the reconstructed image is also possible.

[0034] According to an embodiment of the present disclosure, the holographic dry plate 7 is the core of the recording module 100. The holographic dry plate 7 is made of a semiconductor thin film of gallium arsenide grown by low-temperature molecular beam epitaxy to achieve a time resolution of the order of picoseconds.

[0035] According to an embodiment of the present disclosure, the holographic dry plate 7 is adapted to form interference fringes in response to interference between reference light and object light on the holographic dry plate 7. Gallium arsenide generates a distribution of photogenerated carriers corresponding to the interference fringes within a femtosecond time scale to form a phase grating. The photogenerated carriers complete recombination within a picosecond time scale, so that the phase grating achieves an update rate of the picosecond level.

[0036] According to the embodiments of the present disclosure, GaAs has an extremely fast response speed. Photons with energy greater than the band gap width are absorbed upon impacting the GaAs surface, generating photogenerated carriers within femtosecond timescales. The lifetime of these photogenerated carriers is in the picosecond range, and the photogenerated carriers complete recombination within this timescale. Object light and reference light interfere on the surface of the holographic plate, forming interference fringes. A concentration distribution of photogenerated carriers corresponding to the interference fringes is generated within the GaAs, and the refractive index of the holographic plate changes simultaneously, forming a transient phase grating, also known as a phase grating. After the photogenerated carriers recombine, the phase grating is regenerated.

[0037] In one example, 129 nm silicon nitride anti-reflection films are coated on both sides of the gallium arsenide semiconductor slice to prevent the reconstruction light from reflecting back and forth inside the gallium arsenide semiconductor slice and affecting the reconstruction effect.

[0038] According to the embodiments of the present disclosure, based on the ultrafast response and ultrafast recombination characteristics of gallium arsenide, the phase grating formed on the holographic dry plate has an update rate of the order of picoseconds, so that the real-time holographic system of the embodiments of the present disclosure has a time resolution of the order of picoseconds, which can realize ultrafast recording of ultrafast events.

[0039] Figure 2 The schematic diagram shows the principle of the reconstruction light timing module of the real-time holographic system according to the embodiment of the present disclosure.

[0040] like Figure 2 As shown, the reconstruction light timing module 200 includes a second laser 8 , a glass rod 9 and a delay crystal 10 .

[0041] According to an embodiment of the present disclosure, the second laser 8 is adapted to generate femtosecond pulsed light synchronously with the first laser. The glass rod 9 is adapted to perform wavelength-sequencing and time-sequencing on the femtosecond pulsed light. The time-delay crystal 10 is adapted to perform polarization-sequencing and time-sequencing on the wavelength-sequencing and time-sequencing femtosecond pulsed light to obtain reconstructed light.

[0042] In one example, the second laser 8 can be a chirped femtosecond pulse laser. After synchronization with the first laser 1, the second laser 8 outputs femtosecond pulses with a central wavelength of 1030 nm. The glass rod 9 can be an SF10 glass rod, where SF (Schwerflint) denotes a heavy flint glass material with specific optical properties. The glass rod 9 chirps the femtosecond pulses by wavelength separation. The chirped femtosecond pulses are then polarization-sequenced by a time delay crystal 10 to produce reconstructed light. The reconstructed light is then combined with the reference light by a dichroic mirror 3, resulting in diffraction on the holographic dry plate 7.

[0043] In one example, based on the nature of time serialization, the frame interval of the reconstructed image can be conveniently changed by replacing the glass rod 9 and the time delay crystal 10 with different lengths.

[0044] According to the embodiment of the present disclosure, by adjusting the length of the optical path between the second laser 8 and the dichroic mirror 3 , the time when the reconstruction light reaches the holographic dry plate 7 can be adjusted to obtain a reconstructed image of the ultrafast event at the target time.

[0045] Figure 3 The schematic diagram schematically shows the principle of a multi-frame imaging module of a real-time holographic system according to an embodiment of the present disclosure.

[0046] like Figure 3 As shown, the multi-frame imaging module 300 includes a shift crystal 11, a beam splitter 12, a beam splitter 15, and multiple imaging groups. The first imaging group includes a filter 13 and a camera 14. The second imaging group includes a filter 16 and a camera 17. The third imaging group includes a filter 18 and a camera 19.

[0047] According to an embodiment of the present disclosure, the shift crystal 11 is adapted to receive diffracted waves and output ordinary light and extraordinary light. Multiple beam splitters are adapted to obtain at least one sub-ordinary light beam and at least one sub-extraordinary light beam based on the ordinary light and the extraordinary light. At least one imaging group is adapted to obtain multiple reconstructed images based on a group of sub-ordinary light and a group of sub-extraordinary light, respectively.

[0048] According to an embodiment of the present disclosure, the filters of each imaging group are adapted to output imaging ordinary light having a predetermined wavelength within the sub-ordinary light and imaging extraordinary light having a predetermined wavelength within the sub-ordinary light, based on a set of sub-ordinary light and sub-extraordinary light. The camera of each imaging group is adapted to image the imaging ordinary light to obtain a first frame of reconstructed image, and to image the imaging extraordinary light to obtain a second frame of reconstructed image. The predetermined wavelengths of the imaging ordinary light and imaging extraordinary light output by the filters of different imaging groups are different.

[0049] In one example, filter 13 can be a 1025 nm narrowband filter with a bandwidth of 3 nm. Filter 16 can be a 1030 nm narrowband filter with a bandwidth of 3 nm. Filter 18 can be a 1035 nm narrowband filter with a bandwidth of 3 nm. Cameras 14, 17, and 19 can be CCD cameras.

[0050] In one example, after the reconstruction light is incident on the holographic dry plate 7, it is diffracted by the phase grating, forming diffraction waves. The diffraction waves then pass through the displacement crystal 11 to form ordinary light (o-light) and extraordinary light (e-light). The ordinary light and extraordinary light are spatially spread out and separated into two groups of ordinary light sub-lights and extraordinary light sub-lights by the beam splitter 12. The first group of ordinary light sub-lights and extraordinary light sub-lights passes through the filter 13 to produce imaging ordinary light and extraordinary light of 1025 nm wavelength. The 1025 nm imaging ordinary light and the 1025 nm imaging extraordinary light enter the camera 14, producing the first and second reconstructed image frames, respectively. The second group of ordinary light sub-lights and extraordinary light sub-lights passes through the beam splitter 15 to separate into the third and fourth groups of ordinary light sub-lights and extraordinary light sub-lights. The third group of sub-ordinary light and sub-extraordinary light pass through filter 16 to obtain imaging ordinary light with a wavelength of 1030 nm and imaging extraordinary light with a wavelength of 1030 nm. The imaging ordinary light with a wavelength of 1030 nm and imaging extraordinary light with a wavelength of 1030 nm enter camera 17, respectively producing a third reconstructed image frame and a fourth reconstructed image frame. The fourth group of sub-ordinary light and sub-extraordinary light pass through filter 18 to obtain imaging ordinary light with a wavelength of 1035 nm and imaging extraordinary light with a wavelength of 1035 nm. The imaging ordinary light with a wavelength of 1035 nm and imaging extraordinary light with a wavelength of 1035 nm enter camera 19, respectively producing a fifth reconstructed image frame and a sixth reconstructed image frame.

[0051] According to an embodiment of the present disclosure, the shifted crystal obtains ordinary light and extraordinary light based on polarization time sequencing, and different filters obtain imaging ordinary light and imaging extraordinary light of different predetermined wavelengths based on wavelength time sequencing.

[0052] According to an embodiment of the present disclosure, imaging ordinary light and imaging extraordinary light of different predetermined wavelengths correspond to reconstructed images at different moments.

[0053] In one example, six reconstructed images correspond to the object-light information of the plasma at different moments. By adding more imaging groups and capturing more frames of reconstructed images, continuous high-temporal-resolution observation of ultrafast events can be achieved.

[0054] According to an embodiment of the present disclosure, the real-time holographic system further includes a reflection mirror 4 and a third beam splitter 6 .

[0055] According to an embodiment of the present disclosure, the reflector 4 is adapted to reflect the detection light toward the object to be measured to obtain object light. The third beam splitter 6 is adapted to reflect the object light from the object to be measured toward the holographic dry plate and transmit the combined beam of the reconstruction light and the reference light toward the holographic dry plate.

[0056] In one example, the first beam splitter 2 , the dichroic mirror 3 , the reflecting mirror 4 and the third beam splitter 6 constitute a Mach-Zehnder interferometer.

[0057] According to embodiments of the present disclosure, to achieve high temporal resolution, holographic optical paths using multiplexing technology require the use of picosecond pulse beams as the basis pulses for both the object and reference beams. This makes it difficult to adjust the optical path lengths of the object and reference beams in the Mach-Zehnder interferometer, a task that increases with the number of multiplexed optical paths. However, by using nanosecond pulses as the basis pulses for both the object and reference beams, the embodiments of the present disclosure facilitate interference between the object and reference beams on the holographic plate, reducing the difficulty of optical path adjustment.

[0058] According to an embodiment of the present disclosure, a real-time optical reconstruction method based on a real-time holographic system is provided.

[0059] According to the real-time holographic system and real-time optical reconstruction method of the disclosed embodiments, a holographic dry plate is fabricated using gallium arsenide grown by low-temperature molecular beam epitaxy. The phase grating generated by interference fringes on the holographic dry plate is updated at a rate on the order of picoseconds, enabling ultrafast recording of ultrafast events. Polarization and wavelength splitting techniques are used to generate time-series reconstruction light, resulting in multi-frame reconstructed images and enabling continuous observation of ultrafast events. Nanosecond pulses are used as the basis for object and reference light, reducing the difficulty of optical path adjustment. Femtosecond pulses are used as the basis for reconstruction light, enabling real-time reconstruction with high temporal resolution on the order of picoseconds.

[0060] The embodiments of the present disclosure are described above. However, these embodiments are for illustrative purposes only and are not intended to limit the scope of the present disclosure. Although each embodiment has been described separately above, this does not mean that the measures in each embodiment cannot be used in combination to advantage. The scope of the present disclosure is defined by the appended claims and their equivalents. Without departing from the scope of the present disclosure, those skilled in the art may make various substitutions and modifications, which should all fall within the scope of the present disclosure.

Claims

1. A real-time holographic system, characterized in that: include: A first laser (1) adapted to generate nanosecond pulsed light; A first beam splitter (2) is adapted to split the nanosecond pulse light into reference light and detection light, wherein the detection light is incident on the object to be measured (5) and generates object light having information about the object to be measured; A reconstruction light timing module (200) is suitable for generating reconstruction light with timing-sequential femtosecond pulse information; A dichroic mirror (3) adapted to generate a combined light beam based on the incident reference light and reconstruction light; A holographic dry plate (7) is adapted to receive the combined light beam and the object light, so that the reference light in the combined light beam and the object light interfere with each other on the holographic dry plate to form a phase grating, thereby realizing optical information recording; and is also adapted to receive the reconstructed light and form a diffraction wave based on the phase grating, thereby realizing reading of the optical information with a time resolution of the order of picoseconds; wherein the holographic dry plate is made of a semiconductor thin slice of gallium arsenide grown by low-temperature molecular beam epitaxy, thereby achieving a time resolution of the order of picoseconds; as well as The multi-frame imaging module (300) is suitable for receiving the diffraction wave, obtaining reconstructed images of multiple frames of optical information, and realizing real-time holography.

2. The real-time holographic system according to claim 1, characterized in that: The holographic dry plate is adapted to form interference fringes in response to interference between the reference light and the object light on the holographic dry plate; the gallium arsenide generates a distribution of photogenerated carriers corresponding to the interference fringes within a femtosecond time scale to form the phase grating; the photogenerated carriers complete recombination within a picosecond time scale, so that the phase grating achieves an update rate of the picosecond level.

3. The real-time holographic system according to claim 1, characterized in that: The reconstruction light timing module includes: A second laser (8) adapted to generate femtosecond pulse light synchronously with the first laser; A glass rod (9) adapted to perform wavelength-sequencing time sequencing on the femtosecond pulse light; and The time delay crystal (10) is suitable for performing polarization time sequencing on the femtosecond pulse light that has been time-sequenced by wavelength separation to obtain the reconstructed light.

4. The real-time holographic system according to claim 3, characterized in that: The multi-frame imaging module includes: A displacement crystal (11) is adapted to receive the diffracted wave and output ordinary light and extraordinary light; A plurality of beam splitters (12) adapted to obtain at least one beam of sub-ordinary light and at least one beam of sub-extraordinary light based on the ordinary light and the extraordinary light; At least one imaging group is adapted to obtain a plurality of frames of the reconstructed images based on a group of the sub-ordinary light and the sub-extraordinary light, respectively.

5. The real-time holographic system according to claim 4, characterized in that: Each of the imaging groups comprises: A filter (13) adapted to output, based on a set of the sub-ordinary light and the sub-extraordinary light, imaging ordinary light having a predetermined wavelength in the sub-ordinary light and imaging extraordinary light having a predetermined wavelength in the sub-extraordinary light; A camera (14) is adapted to image the imaging ordinary light to obtain a first frame of the reconstructed image; and to image the imaging extraordinary light to obtain a second frame of the reconstructed image; The predetermined wavelengths of the imaging ordinary light and the imaging extraordinary light output from filters of different imaging groups are different.

6. The real-time holographic system according to claim 5, characterized in that: The shift crystal obtains the ordinary light and the extraordinary light based on the polarization time sequence; the filter obtains imaging ordinary light and imaging extraordinary light of different predetermined wavelengths based on the wavelength time sequence.

7. The real-time holographic system according to claim 5, characterized in that: Imaging ordinary light and imaging extraordinary light of different predetermined wavelengths correspond to obtaining the reconstructed images at different moments.

8. The real-time holographic system according to claim 1, characterized in that: Also includes: A reflector (4) adapted to reflect the detection light toward the object to be detected to obtain the object light; The third beam splitter (6) is adapted to reflect the object light from the object to be measured to the holographic dry plate, and transmit the combined light of the reconstructed light and the reference light to the holographic dry plate.

9. A real-time optical reconstruction method based on the real-time holographic system according to any one of claims 1 to 8.

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