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

Abstract

The invention provides a real-time holographic system and a real-time optical reconstruction method, and relates to the technical field of holography, and the system comprises a first laser which is suitable for generating nanosecond pulse light; the first beam splitter is suitable for dividing the nanosecond pulse light into reference light and detection light, and the detection light enters an object to be detected and generates object light with information of the object to be detected; the reconstruction light time sequence module is suitable for generating reconstruction light with time sequence femtosecond pulse information; the dichroscope is suitable for generating combined light based on the incident reference light and the reconstructed light; the holographic plate is suitable for receiving the combined light and the object light, so that the reference light and the object light in the combined light interfere with each other on the holographic plate to form a phase grating, and optical information recording is realized; the phase grating is also suitable for receiving the reconstructed light and forming a diffraction wave based on the phase grating so as to realize reading of optical information with a time resolution of picosecond magnitude; and the multi-framing imaging module is suitable for receiving the diffracted waves to obtain a plurality of reconstructed images of optical information so as to realize real-time holography.

Description

Technical Field

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

[0002] Holographic technology is combined with pulsed laser technology and applied to the study of ultrafast events. In the field of laser plasma, in order to obtain plasma evolution information at different times, multi-frame optical reconstruction is required. Multi-frame optical reconstruction is achieved using pulsed light multiplexing technology. For example, spatial multiplexing technology records holograms at different times at different positions on the holographic dry plate. Spatial multiplexing technology requires that the object being recorded changes position rapidly, which is not suitable for the field of laser plasma. For example, in angle multiplexing technology, the pulses of the object light propagate in the same direction, and the pulses of the reference light propagate in different directions at different times, forming multi-angle holograms on the holographic dry plate. Angle multiplexing technology can be applied to the field of laser plasma, but the number of reconstructed frames of angle multiplexing technology is the same as the number of angular minutes. The more reconstructed frames, the more complex the optical path, and therefore, the number of reconstructed frames is limited. In addition, in order to achieve high temporal resolution, the pulsed light needs to be as short as picoseconds, and the equal optical path adjustment of the object light and the reference light is somewhat difficult, and the more complex the optical path, the greater the difficulty of equal optical path adjustment.

[0003] In addition, holographic dry plates are the key to holographic technology. In related technologies, holographic dry plate materials are silver halide photosensitive emulsions, which require chemical treatments such as development and fixing after exposure, and real-time reconstruction cannot be achieved. 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 a reference light and a detection light, the detection light being incident on an object to be measured 5 and generating an object light having information of the object to be measured; a reconstruction light timing module 200, adapted to generate a 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 the 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 realizing optical information recording; and also adapted to receive the reconstruction light and form a diffraction wave based on the phase grating, so as to realize reading of the optical information with a time resolution of the order of picoseconds; and a multi-frame imaging module 300, adapted to receive the diffraction wave, obtain a plurality of reconstructed images of optical information, thereby realizing real-time holography.

[0006] According to an embodiment of the present disclosure, the above-mentioned 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, and the gallium arsenide generates a distribution of photogenerated carriers corresponding to the interference fringes within a time scale of femtoseconds to form the phase grating; the photogenerated carriers complete recombination within a time scale of picoseconds to enable the phase grating to achieve an update rate of picoseconds.

[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 time-sequenced by wavelength-division 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, which is suitable for receiving the diffraction wave and outputting ordinary light and extraordinary light; a plurality of beam splitters 12, which are suitable for obtaining 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, which is suitable for obtaining a plurality of frames of the reconstructed images 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 displacement 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 to the object to be detected to obtain the object light; a third beam splitter 6, adapted to reflect the object light from the object to be detected to the holographic dry plate, and transmit the combined light of the reconstruction light and the reference light to 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-series reconstruction light is used to obtain multi-frame reconstructed images to achieve multi-time continuous observation of ultrafast events. Nanosecond pulse light is used as the basic pulse of object light and reference light, so that the object light and reference light are more likely to interfere on the holographic dry plate, reducing the difficulty of optical path adjustment. The phase grating generated by the holographic dry plate with a response rate of picoseconds is used to achieve ultrafast recording of ultrafast events; by combining the reconstruction light of time-series femtosecond pulses, real-time reconstruction of the reconstructed image is also achieved. 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 The schematic diagram schematically shows the principle of a real-time holographic system according to an embodiment of the present disclosure;

[0018] Figure 2 A schematic diagram schematically shows a principle diagram 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 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 combination 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 existence of the features, steps, operations and / or components, but do not exclude the existence 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 using expressions such as "at least one of A, B, and C, etc.", it should generally be interpreted as the meaning of the expression generally understood by those skilled in the art. For example, "a system having at least one of A, B, and C" should include but not be limited to a system having A alone, B alone, C alone, A and B, A and C, B and C, and / or A, B, C, etc. When using expressions such as "at least one of A, B, or C, etc.", it should generally be interpreted as the meaning of the expression generally understood by those skilled in the art. For example, "a system having at least one of A, B, or C" should include but not be limited to a system having A alone, B alone, C alone, A and B, A and C, B and C, and / or A, B, C, etc.

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

[0025] The technical problems in the related technology mainly include: the holographic optical path using the 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 cannot be reconstructed in real time.

[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 principle diagram of a real-time holographic system according to an embodiment of the present disclosure is schematically shown.

[0028] like Figure 1 As shown, the real-time holographic system comprises a recording module 100, a reconstruction light timing module 200 and a multi-frame imaging module 300. The recording module 100 comprises 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 suitable for generating nanosecond pulse light. The first beam splitter 2 is suitable for dividing the nanosecond pulse light into reference light and detection light, and the detection light is incident on the object to be measured 5 and generates object light with information of the object to be measured. The reconstruction light timing module 200 is suitable for generating reconstruction light with timed femtosecond pulse information. The dichroic mirror 3 is suitable for generating a combined beam of light based on the incident reference light and reconstruction light. The holographic dry plate 7 is suitable for receiving the combined beam of light and the object light, so that the reference light and the object light in the combined beam of light interfere on the holographic dry plate 7 to form a phase grating to realize optical information recording; it is also suitable for receiving the reconstruction light, and forming a diffraction wave based on the phase grating to realize the reading of the optical information with a time resolution of the order of picoseconds. The multi-frame imaging module 300 is suitable for receiving the diffraction wave, obtaining a reconstructed image of multiple optical information, and realizing real-time holography.

[0030] According to an embodiment of the present disclosure, in a plasma experiment, another pulsed laser beam is focused on 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 wavelength of the nanosecond pulse light may be 532 nm, and it is divided into reference light and detection light after passing through the first beam splitter 2. When the object 5 to be measured is ablated by other lasers to generate plasma, the detection light is incident on the object 5 to be measured, generating object light carrying plasma information. The reference light and the object light interfere on the surface of the holographic dry plate 7 to form interference fringes, and the refractive index of the holographic dry plate 7 changes to form a phase grating, thereby realizing optical information recording of plasma information.

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

[0033] According to the embodiments of the present disclosure, time-series reconstruction light is used to obtain multi-frame reconstructed images to achieve multi-time continuous observation of ultrafast events. Nanosecond pulse light is used as the basic pulse of object light and reference light, so that the object light and reference light are more likely to interfere on the holographic dry plate, reducing the difficulty of optical path adjustment. The phase grating generated by the holographic dry plate with a response rate of picoseconds is used to achieve ultrafast recording of ultrafast events; by combining the reconstruction light of time-series femtosecond pulses, real-time reconstruction of the reconstructed image is also achieved.

[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, and gallium arsenide generates a distribution of photogenerated carriers corresponding to the interference fringes within a time scale of femtoseconds to form a phase grating; the photogenerated carriers complete recombination within a time scale of picoseconds, so that the phase grating reaches an update rate of picoseconds.

[0036] According to the embodiments of the present disclosure, the response speed of gallium arsenide is extremely fast. Photons with energy greater than the band gap width will be absorbed after irradiating the surface of gallium arsenide. Photogenerated carriers are generated in the femtosecond time scale of gallium arsenide, and the lifetime of photogenerated carriers is in the picosecond level. Photogenerated carriers will complete recombination in the picosecond time scale. The object light and the reference light interfere on the surface of the holographic dry plate to form interference fringes. The concentration distribution of photogenerated carriers corresponding to the interference fringes is generated inside the gallium arsenide. At the same time, the refractive index of the holographic dry plate changes to form a phase-type transient grating, that is, a phase grating. After the photogenerated carriers recombine, the phase grating will be 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 picoseconds, so that the real-time holographic system of the embodiments of the present disclosure has a time resolution of picoseconds, and can achieve 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 pulse light synchronously with the first laser. The glass rod 9 is adapted to perform wavelength-sequencing time serialization on the femtosecond pulse light. The delay crystal 10 is adapted to perform polarization-sequencing time serialization on the wavelength-sequencing time serialized femtosecond pulse light to obtain reconstructed light.

[0042] In one example, the second laser 8 may be a femtosecond pulse chirped laser. After being synchronized with the first laser 1, the second laser 8 outputs femtosecond pulse light with a central wavelength of 1030 nm. The glass rod 9 may be an SF10 glass rod, where SF (Schwerflint-heavy flint) represents a heavy flint glass material with specific optical properties. The glass rod 9 performs wavelength-sequencing and time-sequencing on the femtosecond pulse light to achieve chirping. The chirped femtosecond pulse light is subjected to polarization-sequencing by the delay crystal 10 to obtain reconstructed light. The reconstructed light is combined with the reference light through the dichroic mirror 3 to diffract 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 glass rods 9 and time-delay crystals 10 of different lengths.

[0044] According to the embodiments 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 an ultrafast event at a target time.

[0045] Figure 3 The schematic diagram 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 displacement crystal 11, a beam splitter 12, a beam splitter 15 and a plurality of 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 displacement crystal 11 is adapted to receive diffracted waves and output ordinary light and extraordinary light. A plurality of beam splitters are adapted to obtain at least one beam of sub-ordinary light and at least one beam of sub-extraordinary light based on ordinary light and extraordinary light. At least one imaging group is adapted to obtain multiple frames of 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 filter of each imaging group is adapted to output imaging ordinary light with a predetermined wavelength in the sub-ordinary light and imaging extraordinary light with a predetermined wavelength in the sub-extraordinary light based on a group 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 the imaging extraordinary light outputted from the filters of different imaging groups are different.

[0049] In one example, filter 13 may be a 1025 nm narrowband filter with a bandwidth of 3 nm. Filter 16 may be a 1030 nm narrowband filter with a bandwidth of 3 nm. Filter 18 may be a 1035 nm narrowband filter with a bandwidth of 3 nm. Cameras 14, 17, and 19 may 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 to form a diffraction wave. The diffraction wave passes through the displacement crystal 11 to form ordinary light (o light) and extraordinary light (e light). The ordinary light and extraordinary light are spread out in space and are divided into two groups of sub-ordinary light and sub-extraordinary light by the beam splitter 12. The first group of sub-ordinary light and sub-extraordinary light pass through the filter 13 to obtain imaging ordinary light with a wavelength of 1025nm and imaging extraordinary light with a wavelength of 1025nm. The imaging ordinary light with a wavelength of 1025nm and the imaging extraordinary light with a wavelength of 1025nm enter the camera 14, and the first frame of the reconstructed image and the second frame of the reconstructed image can be obtained respectively. The second group of sub-ordinary light and sub-extraordinary light are divided into the third group and the fourth group of sub-ordinary light and sub-extraordinary light by the beam splitter 15. The third group of sub-ordinary light and sub-extraordinary light pass through filter 16 to obtain imaging ordinary light with a wavelength of 1030nm and imaging extraordinary light with a wavelength of 1030nm. The imaging ordinary light with a wavelength of 1030nm and the imaging extraordinary light with a wavelength of 1030nm enter camera 17, and the third frame of reconstructed image and the fourth frame of reconstructed image can be obtained respectively. The fourth group of sub-ordinary light and sub-extraordinary light pass through filter 18 to obtain imaging ordinary light with a wavelength of 1035nm and imaging extraordinary light with a wavelength of 1035nm. The imaging ordinary light with a wavelength of 1035nm and the imaging extraordinary light with a wavelength of 1035nm enter camera 19, and the fifth frame of reconstructed image and the sixth frame of reconstructed image can be obtained respectively.

[0051] According to the embodiments of the present disclosure, the displacement crystal obtains ordinary light and extraordinary light based on polarization time serialization. Different filters obtain imaging ordinary light and imaging extraordinary light of different predetermined wavelengths based on wavelength time serialization.

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

[0053] In one example, six reconstructed images correspond to the object light information of plasma information at different moments. More imaging groups can be added to take more frames of reconstructed images to achieve continuous high-time resolution observation of ultrafast events.

[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 to 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 detected to the holographic dry plate, and transmit the combined light of the reconstruction light and the reference light to the holographic dry plate.

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

[0057] According to the embodiments of the present disclosure, in order to achieve high time resolution, the holographic optical path using multiplexing technology needs to use picosecond pulse beams as the basic pulses of the object light and the reference light, which makes it difficult to adjust the equal optical path of the object light path and the reference light path of the Mach-Zehnder interferometer. The more the number of multiplexed optical paths, the greater the difficulty. The embodiments of the present disclosure use nanosecond pulses as the basic pulses of the object light and the reference light, so that the object light and the reference light are more likely to interfere on the holographic dry 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 embodiment, a holographic dry plate is made of gallium arsenide grown by low-temperature molecular beam epitaxy. The phase grating generated based on the interference fringes on the holographic dry plate is updated at a rate of picoseconds, thereby realizing ultrafast recording of ultrafast events. By using polarization splitting technology and wavelength splitting technology to obtain time-series reconstruction light, multi-frame reconstructed images can be obtained, thereby realizing continuous observation of ultrafast events. By using nanosecond pulse light as the basic pulse of object light and reference light, the difficulty of optical path adjustment is reduced. By using femtosecond pulse light as the basic pulse of reconstruction light, real-time reconstruction with high time resolution of picoseconds is realized.

[0060] The embodiments of the present disclosure are described above. However, these embodiments are only for illustrative purposes and are not intended to limit the scope of the present disclosure. Although the embodiments are described above separately, this does not mean that the measures in the various embodiments cannot be used in combination to advantage. The scope of the present disclosure is defined by the attached claims and their equivalents. Without departing from the scope of the present disclosure, those skilled in the art may make a variety of 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) is suitable for generating 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), adapted to generate reconstruction light with timing 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; as well as The multi-frame imaging module (300) is suitable for receiving the diffraction wave, obtaining a plurality of reconstructed images 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 made of a semiconductor thin slice of gallium arsenide grown by low-temperature molecular beam epitaxy to achieve a time resolution of picosecond order.

3. The real-time holographic system according to claim 2, characterized in that: The holographic dry plate is suitable for forming interference fringes in response to the interference of the reference light and the object light on the holographic dry plate, and 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 reaches an update rate of the picosecond level.

4. The real-time holographic system according to claim 1, characterized in that: The reconstruction light timing module comprises: 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-sequence, so as to obtain the reconstructed light.

5. The real-time holographic system according to claim 4, characterized in that: The multi-frame imaging module comprises: A displacement crystal (11), 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.

6. The real-time holographic system according to claim 5, 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.

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

8. The real-time holographic system according to claim 6, characterized in that: Imaging ordinary light and imaging extraordinary light of different predetermined wavelengths correspond to obtaining the reconstructed images at different moments.

9. The real-time holographic system according to claim 1, characterized in that: Also includes: A reflector (4) adapted to reflect the detection light to 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.

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

Images