CN210922845U - Multi-angle chromatographic recording frequency domain holographic imaging device - Google Patents
Multi-angle chromatographic recording frequency domain holographic imaging device Download PDFInfo
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- CN210922845U CN210922845U CN201922308308.3U CN201922308308U CN210922845U CN 210922845 U CN210922845 U CN 210922845U CN 201922308308 U CN201922308308 U CN 201922308308U CN 210922845 U CN210922845 U CN 210922845U
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Abstract
The application provides a device of multi-angle chromatography record frequency domain holographic imaging, the device includes: an excitation light generator comprising: the device comprises a femtosecond laser, a frequency multiplier, an excitation beam splitting piece and a Michelson interferometer; a chromatographic detection light generator comprising: a chromatographic beam splitter and a chromatographic delay optical path; the ultrafast event reference light generator is used for obtaining ultrafast event reference light and transmitting the ultrafast event reference light to the imaging spectrometer; the ultrafast event detection light generator is used for simultaneously enabling the chromatographic reflection delayed detection light, the chromatographic transmission delayed detection light and the ultrafast event excitation light to reach the ultrafast event position, and the ultrafast event excitation light is used for exciting to generate ultrafast events; generating ultrafast event detection light carrying ultrafast event information and transmitting the ultrafast event detection light to an imaging spectrometer; and the imaging spectrometer is used for carrying out frequency domain interference on the ultrafast event reference light and the ultrafast event detection light to obtain a frequency domain holographic two-dimensional spectral information image. The utility model discloses record frequency domain holographic imaging obtains the two-dimensional spectral information image of complete and clear description.
Description
Technical Field
The application relates to the technical field of imaging, in particular to a multi-angle chromatographic recording frequency domain holographic imaging device.
Background
The frequency domain digital holography can record the process of continuous change of time dimension by a frequency domain-time domain mapping method, and has great application prospect in the field of ultrafast imaging. However, frequency domain digital holography is recorded by a grating spectrometer, when a beam of composite light enters an entrance slit of the grating spectrometer, the beam is firstly converged into parallel light by an optical collimating mirror, then is dispersed into separate wavelengths (colors) by a diffraction grating, and then is imaged into an exit slit by a focusing mirror by utilizing different angles of each wavelength leaving the grating, and the exit wavelength can be accurately changed by computer control.
The grating imaging spectrum technology is a product combining an imaging technology and a spectrum technology, two-dimensional space information and spectrum information of a target object can be obtained through a platform or a scanning mode, a data cube is further formed, and tens to hundreds of narrow wave bands are formed for continuous spectrum measurement through means of dispersion, diffraction, interference and the like for each distinguishable space pixel while space characteristics of an observation target are imaged. The imaging spectral data cube may be implemented by a series of image coordinate transformations and linked individual dimensional spatial coordinates corresponding to the two dimensional spatial location of the target and the location of each band spectral dimension. The slit on the spectrometer is used as a field stop to allow the image of the object to partially pass through, and to block other light from passing through. Therefore, when the image passing through the slit is irradiated onto the dispersion element through the collimating objective, the image can be dispersed according to the wavelength in the direction perpendicular to the slit, and finally focused and imaged on the image plane of the imaging spectrometer by the imaging objective.
To obtain two-dimensional spatial information, scanning is always used for recording, and femtosecond high-speed imaging cannot be realized. The change of the one-dimensional section information along with the frequency is obtained by solving the phase, and then the change of the one-dimensional information along with the time is obtained by the frequency domain-time domain corresponding relation, which is far insufficient for judging the evolution law of the ultrafast process. Due to the limitation of the slit, the change of the refractive index integral quantity of only one spatial dimension in space along with time can be obtained, so that complete imaging and clear description of the whole change process are difficult.
Therefore, how to provide a complete imaging and clearly described scheme for recording a two-dimensional space is a technical problem to be solved in the field.
SUMMERY OF THE UTILITY MODEL
The application aims to provide a method and a device for multi-angle chromatography recording frequency domain holographic imaging, and solves the technical problem that a scheme for recording a two-dimensional space which is complete in imaging and clear in description does not exist in the prior art.
In order to achieve the above object, the present application provides a device for multi-angle tomographic recording of frequency domain holographic imaging, comprising: an excitation light generator, a chromatography detection light generator, an ultrafast event reference light generator, an ultrafast event detection light generator and an imaging spectrometer; wherein the content of the first and second substances,
an excitation light generator comprising: the device comprises a femtosecond laser, a frequency multiplier, an excitation beam splitting piece and a Michelson interferometer; the femtosecond laser device emits femtosecond laser to the frequency multiplier, and the frequency multiplier processes the femtosecond laser to obtain fundamental frequency light and frequency doubling light; the excitation light beam splitting sheet transmits the frequency doubling light to a Michelson interferometer, and reflects the fundamental frequency light to a delay line excitation light path for processing to obtain ultrafast event excitation light; the Michelson interferometer processes the transmitted frequency-doubled light to obtain reference light and detection light;
the chromatographic detection light generator comprises: more than or equal to one chromatography beam splitter and chromatography delay optical path; the chromatographic beam splitter transmits the reference light and the detection light to obtain chromatographic transmission reference light and detection light and chromatographic reflection reference light and detection light, reflects the chromatographic reflection reference light and the detection light, and enters a chromatographic delay light path after being reflected by a reflector; the chromatography delay optical path is used for processing the chromatography reflection reference light and the detection light to obtain chromatography reflection delay reference light and detection light, and processing the chromatography transmission reference light and the detection light to obtain chromatography transmission delay reference light and detection light;
the ultrafast event reference light generator is used for reflecting the chromatographic reflection delayed reference light and the chromatographic transmission delayed reference light by the chromatographic reflectors with the respective corresponding angles, passing through the ultrafast event position, obtaining ultrafast event reference light of ultrafast events and transmitting the ultrafast event reference light to the imaging spectrometer;
the ultrafast event detection light generator reflects the chromatographic reflection delayed detection light and the chromatographic transmission delayed detection light through the chromatographic reflectors with the corresponding angles respectively, and then reaches the ultrafast event position together with the ultrafast event excitation light, and the ultrafast event excitation light is excited to generate an ultrafast event; the chromatographic reflection delayed detection light and the chromatographic transmission delayed detection light pass through the ultrafast event to generate ultrafast event detection light carrying ultrafast event information and transmit the ultrafast event detection light to the imaging spectrometer;
and the imaging spectrometer performs frequency domain interference on the ultrafast event reference light and the ultrafast event detection light to obtain a frequency domain holographic two-dimensional spectral information image.
Optionally, wherein the tomographic delay optical path includes: the device comprises a chromatography delay beam splitter, a chromatography transmission delay optical path and a chromatography reflection delay optical path; wherein the content of the first and second substances,
the chromatographic delay beam splitter receives the reflected chromatographic reflection reference light and the reflected detection light, transmits the reference light and the detection light to the chromatographic transmission delay light path, and transmits the reference light and the detection light to the chromatographic reflection delay light path after reflection; receiving the transmitted chromatographic transmission reference light and the transmitted detection light, transmitting the transmitted chromatographic transmission reference light and the transmitted detection light to the chromatographic transmission delay light path, and transmitting the transmitted chromatographic transmission reference light and the transmitted detection light to the chromatographic reflection delay light path after reflection;
the chromatographic transmission delay optical path is used for processing the transmitted chromatographic reflection reference light and the transmitted detection light to obtain transmitted chromatographic reflection delay reference light and transmitted detection light; processing the transmitted reference light and the probe light transmitted by the chromatography, the transmitted reference light and the probe light transmitted by the chromatography are transmitted and delayed;
the chromatographic reflection delay optical path is used for processing the reflected chromatographic reflection reference light and the reflected detection light to obtain reflected chromatographic reflection delay reference light and reflected detection light; and processing the reflected chromatographic transmission reference light and the reflected detection light to obtain reflected chromatographic transmission delay reference light and reflected detection light.
Optionally, wherein the imaging spectrometer comprises: detecting a light receiving spectrometer and a spectral information imager; wherein the content of the first and second substances,
the detection light receiving spectrometer is connected with the spectral information imager, receives the ultrafast event reference light and the ultrafast event detection light at each angle, records and carries out frequency domain interference to obtain interference fringes and sends the interference fringes to the spectral information imager;
the spectrum information imager is connected with the detection light receiving spectrometer, and recovers a frequency domain holographic two-dimensional spectrum information image of the ultrafast event, wherein the space two-dimensional information of the ultrafast event changes along with time, by using a filtering back projection algorithm through the interference fringes.
Optionally, wherein the apparatus further comprises: and the focusing lens is positioned between the delay line excitation light path and the ultrafast event position, converges the ultrafast event excitation light and then sends the ultrafast event excitation light to the ultrafast event position.
Optionally, wherein the apparatus further comprises: a beam delay adjuster comprising: an exciting light delay adjusting unit and a detecting light delay adjusting unit; wherein the content of the first and second substances,
the excitation light delay adjusting unit is connected with the Michelson interferometer and the detection light delay adjusting unit, the Michelson interferometer is adjusted at preset time intervals, the multiplied light is transmitted to the adjusted Michelson interferometer through the beam splitting piece to be processed, and reference light and detection light are obtained;
the detection light delay adjusting unit is connected with the exciting light delay adjusting unit, and adjusts the delay line exciting light path and each chromatography delay light path according to the time interval, so that the fundamental frequency light is reflected to the delay line exciting light path through the beam splitting sheet for processing, and the obtained ultrafast event exciting light, the chromatography reflection delay detection light and the chromatography transmission delay detection light synchronously reach the ultrafast event position.
The utility model provides a device of multi-angle chromatography record frequency domain holographic imaging, the beneficial effect of realization is as follows at least:
(1) the method and the device for multi-angle chromatography recording frequency domain holographic imaging adopt chromatography synthesis to record images of phase change along with time of two-dimensional space, phase change along with time of one-dimensional direction in space is obtained by each angle frequency domain holography, the frequency domain holography results of a plurality of different angles are synthesized to obtain the evolution process of the whole space two-dimensional refractive index, the advantages of dense time-dimensional sampling and high resolution ratio are achieved by using the frequency domain femtosecond holographic imaging technology, and meanwhile the defect that the space recording information is few is overcome. Focusing and imaging to obtain a complete and clearly described two-dimensional spectral information image.
(2) The method and the device for multi-angle chromatographic recording frequency domain holographic imaging use a scanning mode for recording, and two-dimensional space spectral information which cannot be obtained by femtosecond-level high-speed imaging is obtained. The spectrum information sampling is completed by adopting a multi-angle chromatography delay light path to generate detection light carrying ultrafast event information, and then the detection light is combined and spliced into a light beam section to form two-dimensional spectrum information, so that the time change of a one-dimensional space direction detection pulse phase can be obtained, and the evolution process of the two-dimensional space information along with time in the ultrafast process can be further obtained.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present application, and other drawings can be obtained by those skilled in the art according to the drawings.
FIG. 1 is a schematic flow chart of a method for multi-angle tomographic recording of frequency domain holographic imaging according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a michelson interferometer according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of an optical path of a delay line according to an embodiment of the present invention;
FIG. 4 is a schematic flow chart of a second method for multi-angle tomographic frequency domain holographic imaging according to an embodiment of the present invention;
FIG. 5 is a schematic flow chart of a third method for multi-angle tomographic frequency domain holographic imaging according to an embodiment of the present invention;
FIG. 6 is a schematic flow chart of a fourth method for multi-angle tomographic frequency domain holographic imaging according to an embodiment of the present invention;
FIG. 7 is a schematic flow chart of a fifth method for multi-angle tomographic frequency domain holographic imaging according to an embodiment of the present invention;
FIG. 8 is a schematic structural diagram of an apparatus for multi-angle tomographic frequency domain holographic imaging according to an embodiment of the present invention;
FIG. 9 is a schematic structural diagram of a chromatographic delay optical path in an apparatus for multi-angle chromatographic recording of frequency domain holographic imaging according to an embodiment of the present invention;
FIG. 10 is a schematic structural diagram of an apparatus for multi-angle tomographic frequency domain holographic imaging according to a second embodiment of the present invention;
fig. 11 is a schematic structural diagram of an apparatus for multi-angle tomographic frequency domain holographic imaging according to a third embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present application are clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Examples
As shown in fig. 1 to 3, fig. 1 is a schematic flow chart of a method for multi-angle tomography frequency domain holographic imaging in this embodiment; fig. 2 is a schematic structural diagram of a michelson interferometer in this embodiment, the synchronous time control of the probe light and the excitation light can be realized by adjusting the delay line, and the time of the reference light and the probe light is adjusted by the distance between the two michelson mirrors M1 and M2 relative to the single-wavelength beam splitter BS2, and the longer the distance is, the longer the light transmission time is, and therefore, the larger the time difference is. Fig. 3 is a schematic structural diagram of an optical path of a delay line in this embodiment. In the embodiment, the process of continuous change of the time dimension is recorded by a frequency domain-time domain mapping method, and the method has a great application prospect in the field of ultrafast imaging. It is difficult to image and clearly describe the entire process. In the method, on the basis of the frequency domain digital holographic imaging method, the multi-angle chromatographic recording frequency domain digital hologram is developed through the expansion of the spatial recording dimension, and the spatial dimension of the frequency domain hologram is expanded to two dimensions. Specifically, the method comprises the following steps:
101, processing femtosecond laser emitted by a femtosecond laser through a frequency multiplier to obtain fundamental frequency light and frequency multiplied light; transmitting the frequency doubling light to a Michelson interferometer for processing through an excitation light beam splitter to obtain reference light and detection light; and reflecting the fundamental frequency light to a delay line excitation light path through an excitation light beam splitting sheet to be processed to obtain ultrafast event excitation light.
Optionally, the femtosecond laser with a wavelength of 800nm emitted by the femtosecond laser is processed by a frequency multiplier to obtain fundamental frequency light with a wavelength of 800nm and frequency-doubled light with a wavelength of 400nm, and the excitation beam splitting plate is a dual-wavelength beam splitter, and can transmit the frequency-doubled light with a wavelength of 400nm and reflect the fundamental frequency light with a wavelength of 800 nm.
102, processing the reference light and the detection light by more than or equal to one chromatography beam splitter to obtain chromatography transmission reference light and detection light and chromatography reflection reference light and detection light; after being reflected by a reflector, the chromatographic reflection reference light and the detection light enter a chromatographic delay light path for processing to obtain the chromatographic reflection delay reference light and the detection light; and the chromatographic transmission reference light and the detection light enter a chromatographic delay optical path for processing to obtain the chromatographic transmission delay reference light and the detection light.
And 103, reflecting the chromatographic reflection delayed reference light and the chromatographic transmission delayed reference light by the chromatographic reflectors with the respective corresponding angles, passing through the ultrafast event position, obtaining ultrafast event reference light of the ultrafast event, and transmitting the ultrafast event reference light to the imaging spectrometer.
A michelson interferometer, comprising: for a single wavelength beam splitter SubBS2 and two mirrors SubM1 and SubM2 for the frequency doubled light, the frequency doubled light travels to SubBS2, 50% of the light is reflected by SubBS2 to mirror SubM1, and the other 50% of the light is transmitted through SubBS2 to the other mirror SubM 2. Here, two beams of light are generated, one beam is reflected by SubBS2, one beam is transmitted by SubBS2, then the two beams of light are reflected by respective mirrors and returned to SubBS2, the light originally reflected from SubBS2 reaches SubBS2 after being reflected by SubM1 and is transmitted downward, the light originally transmitted from SubBS2 is reflected by SubM2 and is returned to SubBS2, so that the two beams of light become the same direction, but still two beams of light, and are sent out by mirror SubM3, wherein one beam is used as probe light or object light (probe light/object light), and the other beam is used as reference light.
The optical path of the delay line is used for adjusting time, and consists of mirrors M2, M3, M4 and M5, and the mirror M3 and the mirror M4 can be adjusted downwards to change the path of light. The delay lines of the several beams of light are adjusted in this way, firstly, the time synchronization of the detection light and the laser event in each beam of light is ensured, and secondly, the time of the detection light in different light paths reaching the ultrafast event is also ensured to be consistent.
The delayed reference light is earlier in time than the delayed excitation light, based on the time of the ultrafast event, i.e. where no ultrafast event is generated in the figure, before the event is triggered, the delayed reference light passes through the location where the ultrafast event is generated, then the delayed excitation light triggers the event, and the delayed probe light also reaches the location where the ultrafast event is generated.
When the delayed excitation light excites the ultrafast event, the delayed detection light just reaches the position where the ultrafast event is generated, and then the delayed detection light passes through the ultrafast event, which also carries the information of the ultrafast event, and may at least include: amplitude information and phase information.
And 105, carrying out frequency domain interference on the ultrafast event reference light and the ultrafast event detection light in an imaging spectrometer to obtain a frequency domain holographic two-dimensional spectral information image.
In some optional embodiments, as shown in fig. 4, which is a schematic flow chart of a second multi-angle chromatography recording frequency domain holographic imaging method in this embodiment, different from fig. 1, the reference light and the detection light reflected by the chromatography are reflected by a reflector and then enter a chromatography delayed light path for processing, so as to obtain the reference light and the detection light reflected by the chromatography; the chromatographic transmission reference light and the detection light enter a chromatographic delay light path for processing to obtain the chromatographic transmission delay reference light and the detection light, and the processing comprises the following steps:
step 401, after being reflected by a reflector, the reference light and the detection light are transmitted by a chromatography delay beam splitter of a chromatography delay optical path to obtain transmitted chromatography reflection delay reference light and detection light; the chromatographic reflection reference light and the detection light are reflected by the reflecting mirror, enter the chromatographic delay beam splitter of the chromatographic delay light path, are reflected by the delay light path, and then are reflected by the reflective mirror to obtain the reflective chromatographic reflection delay reference light and the detection light.
In some optional embodiments, as shown in fig. 5, which is a schematic flow chart of a third multi-angle tomography frequency domain holographic imaging method in this embodiment, different from fig. 1, the imaging spectrometer performs frequency domain interference according to ultrafast event reference light and ultrafast event probe light to obtain a two-dimensional spectral information image of frequency domain hologram, where:
And 502, recovering a frequency domain holographic two-dimensional spectral information image of space two-dimensional information of the ultrafast event changing along with time by using a filtering back projection algorithm through interference fringes.
In some optional embodiments, as shown in fig. 6, which is a schematic flow chart of a fourth multi-angle tomographic recording frequency domain holographic imaging method in this embodiment, different from fig. 1, after being reflected by a tomographic mirror with a corresponding angle, the tomographic reflection delayed detection light and the tomographic transmission delayed detection light reach an ultrafast event position simultaneously with ultrafast event excitation light, and the ultrafast event is generated by the ultrafast event excitation light excitation, as follows:
In some optional embodiments, as shown in fig. 7, which is a schematic flow chart of a fifth method for multi-angle tomography recording frequency domain holographic imaging in this embodiment, different from fig. 1, the doubled light is transmitted to a michelson interferometer through a beam splitter to obtain a reference light and a probe light; the fundamental frequency light is reflected to a delay line excitation light path through a beam splitting sheet to be processed, and ultrafast event excitation light is obtained, wherein the ultrafast event excitation light comprises the following components:
and 701, adjusting the Michelson interferometer at a preset time interval, and transmitting the frequency doubling light to the adjusted Michelson interferometer through the beam splitting piece to be processed to obtain reference light and detection light.
Optionally, it can also be set as: the corresponding relation between the time interval between the reference light and the detection light and the characteristics of different ultrafast events is preset, and when the ultrafast events excited by different objects or different object scenes are detected, the time interval of the corresponding ultrafast event is selected based on the characteristics of the ultrafast events to adjust the Michelson interferometer. Preferably, a model relationship between the ultrafast event characteristics and the time interval between the reference light and the probe light may be created in advance by combining with the neural network, and when the ultrafast event is detected, the corresponding time interval adjustment michelson interferometer is automatically obtained according to the model relationship.
In some alternative embodiments, as shown in fig. 8 to 11, fig. 8 is a schematic structural diagram of an apparatus for multi-angle tomographic recording of frequency-domain holographic imaging in this embodiment; FIG. 9 is a schematic structural diagram of a chromatographic delay optical path in a second multi-angle chromatographic recording frequency-domain holographic imaging apparatus according to this embodiment; FIG. 10 is a schematic structural diagram of a second multi-angle tomographic frequency-domain holographic imaging apparatus in this embodiment; FIG. 11 is a schematic structural diagram of a third multi-angle tomographic frequency-domain holographic imaging apparatus in this embodiment. The device can be used for implementing the method for multi-angle chromatographic recording frequency domain holographic imaging, in particular to the device for multi-angle chromatographic recording frequency domain holographic imaging, which comprises the following steps: an excitation light generator 801, a tomographic detection light generator 802, an ultrafast event reference light generator 803, an ultrafast event probe light generator 804, and an imaging spectrometer 805.
The excitation light generator 801 includes: a femtosecond laser 811, a frequency multiplier 812, an excitation beam splitter 813, and a michelson interferometer 814; the femtosecond laser is emitted by the femtosecond laser to the frequency multiplier, and the frequency multiplier processes the femtosecond laser to obtain fundamental frequency light and frequency doubling light; the excitation light beam splitting sheet transmits the frequency doubling light to the Michelson interferometer, and reflects the fundamental frequency light to the delay line excitation light path 826 for processing to obtain ultrafast event excitation light; and the Michelson interferometer processes the transmitted frequency doubling light to obtain the reference light and the detection light. In the figure, M is a reflector and BS is a beam splitting sheet.
A chromatographic detection light generator 802, comprising: one or more than one of the chromatographic beam splitter 821 and the chromatographic delay optical path 822; the chromatographic beam splitter transmits the reference light and the detection light to obtain chromatographic transmission reference light and detection light and chromatographic reflection reference light and detection light, reflects the chromatographic reflection reference light and the detection light, and enters a chromatographic delay light path after being reflected by the reflector; the chromatographic delay optical path 822 processes the chromatographic reflection reference light and the detection light to obtain chromatographic reflection delay reference light and detection light, and processes the chromatographic transmission reference light and the detection light to obtain chromatographic transmission delay reference light and detection light.
And an ultrafast event reference light generator 803, which reflects the tomographic reflection delayed reference light and the tomographic transmission delayed reference light by the tomographic reflectors with the respective corresponding angles, passes through the ultrafast event position, and transmits the ultrafast event reference light of the ultrafast event to the imaging spectrometer.
Ultrafast event detection light generator 804, after reflecting the chromatographic reflection delayed detection light and the chromatographic transmission delayed detection light by the respective corresponding angle chromatographic reflector, the chromatographic reflection delayed detection light and the chromatographic transmission delayed detection light reach the ultrafast event position simultaneously, and the ultrafast event excitation light excites to generate an ultrafast event; the chromatographic reflection delayed detection light and the chromatographic transmission delayed detection light pass through the ultrafast event to generate ultrafast event detection light carrying ultrafast event information and transmit the ultrafast event detection light to the imaging spectrometer.
The imaging spectrometer 805 performs frequency domain interference on the ultrafast event reference light and the ultrafast event probe light to obtain a frequency domain holographic two-dimensional spectral information image.
Optionally, the apparatus further comprises: and the focusing lens 806 is positioned between the delay line excitation light path and the ultrafast event position, converges the ultrafast event excitation light, and then sends the ultrafast event excitation light to the ultrafast event position.
In some alternative embodiments, the chromatographic delay optical path 822 includes: a chromatographic delay beam splitter 823, a chromatographic transmission delay optical path 824, and a chromatographic reflection delay optical path 825; wherein the content of the first and second substances,
the chromatographic delay beam splitter 823 is configured to receive the reflected chromatographic reflection reference light and the reflected detection light, transmit the reference light and the detection light to the chromatographic transmission delay optical path 824, and transmit the reference light and the detection light to the chromatographic reflection delay optical path 825; the transmitted reference and probe light are received, transmitted and sent to the transmission delay optical path 824, and reflected and sent to the reflection delay optical path 825.
A chromatographic transmission delay optical path 824 for processing the transmitted chromatographic reflection reference light and the transmitted detection light to obtain transmitted chromatographic reflection delay reference light and transmitted detection light; the transmitted reference light and the probe light are transmitted chromatographically, and the transmitted reference light and the probe light are delayed chromatographically.
A chromatographic reflection delay optical path 825 for processing the reflected chromatographic reflection reference light and the reflected detection light to obtain reflected chromatographic reflection delay reference light and reflected detection light; and processing the reflected chromatographic transmission reference light and the detection light to obtain reflected chromatographic transmission delay reference light and detection light.
In some alternative embodiments, as shown in fig. 10, an imaging spectrometer 805, comprises: greater than or equal to one of the detection light receives the spectrometer 851 and the spectral information imager 852. The detection light receiving spectrometer 851 is connected to the spectral information imager 852, receives the ultrafast event reference light and the ultrafast event probe light at each angle, records and performs frequency domain interference to obtain interference fringes, and transmits the interference fringes to the spectral information imager.
The spectral information imager 852 is connected with the detection light receiving spectrometer 851 and recovers a frequency domain holographic two-dimensional spectral information image of the spatial two-dimensional information of the ultrafast event changing along with time by using a filtering back projection algorithm through interference fringes.
In some alternative embodiments, as shown in fig. 11, the apparatus further comprises: a beam delay adjuster 1101, comprising: an excitation light delay adjusting unit 1111 and a detection light delay adjusting unit 1112. The excitation light delay adjusting unit 1111 is connected to the michelson interferometer 814 and the detection light delay adjusting unit 1112, and adjusts the michelson interferometer at a predetermined time interval, and transmits the multiplied light to the adjusted michelson interferometer through the beam splitting plate to obtain the reference light and the detection light.
And a detection light delay adjusting unit 1112, connected to the excitation light delay adjusting unit 1111, the delay line excitation light path 826, and the chromatography delay light path 822, for adjusting the delay line excitation light path and each chromatography delay light path according to a time interval, so that the fundamental frequency light is reflected to the delay line excitation light path via the beam splitting sheet for processing, and the obtained ultrafast event excitation light, the chromatography reflection delay detection light, and the chromatography transmission delay detection light synchronously reach the ultrafast event position.
The method and the device for multi-angle chromatographic recording frequency domain holographic imaging have the following beneficial effects:
and synthesizing the result of the change of the chromatographic two-dimensional space phase along with time, wherein the phase in one-dimensional direction in the space changes along with the time dimension in each angle frequency domain holography, and synthesizing by using the frequency domain holography results of different angles to obtain the change relation of the whole space two-dimensional refractive index along with time.
It should be noted that the ultrafast event reference light generator 803 and the ultrafast event detection light generator 804 are integrated with the tomographic detection light generator 802 to form a tomographic system.
While the preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all alterations and modifications as fall within the scope of the application. It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.
Claims (5)
1. An apparatus for multi-angle tomographic recording of frequency domain holographic imagery, comprising: an excitation light generator, a chromatography detection light generator, an ultrafast event reference light generator, an ultrafast event detection light generator and an imaging spectrometer; wherein the content of the first and second substances,
an excitation light generator comprising: the device comprises a femtosecond laser, a frequency multiplier, an excitation beam splitting piece and a Michelson interferometer; the femtosecond laser device emits femtosecond laser to the frequency multiplier, and the frequency multiplier processes the femtosecond laser to obtain fundamental frequency light and frequency doubling light; the excitation light beam splitting sheet transmits the frequency doubling light to a Michelson interferometer, and reflects the fundamental frequency light to a delay line excitation light path for processing to obtain ultrafast event excitation light; the Michelson interferometer processes the transmitted frequency-doubled light to obtain reference light and detection light;
the chromatographic detection light generator comprises: more than or equal to one chromatography beam splitter and chromatography delay optical path; the chromatographic beam splitter transmits the reference light and the detection light to obtain chromatographic transmission reference light and detection light and chromatographic reflection reference light and detection light, reflects the chromatographic reflection reference light and the detection light, and enters a chromatographic delay light path after being reflected by a reflector; the chromatography delay optical path is used for processing the chromatography reflection reference light and the detection light to obtain chromatography reflection delay reference light and detection light, and processing the chromatography transmission reference light and the detection light to obtain chromatography transmission delay reference light and detection light;
the ultrafast event reference light generator is used for reflecting the chromatographic reflection delayed reference light and the chromatographic transmission delayed reference light by the chromatographic reflectors with the respective corresponding angles, passing through the ultrafast event position, obtaining ultrafast event reference light of ultrafast events and transmitting the ultrafast event reference light to the imaging spectrometer;
the ultrafast event detection light generator reflects the chromatographic reflection delayed detection light and the chromatographic transmission delayed detection light through the chromatographic reflectors with the corresponding angles respectively, and then reaches the ultrafast event position together with the ultrafast event excitation light, and the ultrafast event excitation light is excited to generate an ultrafast event; the chromatographic reflection delayed detection light and the chromatographic transmission delayed detection light pass through the ultrafast event to generate ultrafast event detection light carrying ultrafast event information and transmit the ultrafast event detection light to the imaging spectrometer;
and the imaging spectrometer performs frequency domain interference on the ultrafast event reference light and the ultrafast event detection light to obtain a frequency domain holographic two-dimensional spectral information image.
2. The apparatus for multi-angle tomosynthesis recording frequency domain holographic imaging according to claim 1, wherein the tomosynthesis delay optical path comprises: the device comprises a chromatography delay beam splitter, a chromatography transmission delay optical path and a chromatography reflection delay optical path; wherein the content of the first and second substances,
the chromatographic delay beam splitter receives the reflected chromatographic reflection reference light and the reflected detection light, transmits the reference light and the detection light to the chromatographic transmission delay optical path, and transmits the reference light and the detection light to the chromatographic reflection delay optical path after reflection; receiving the transmitted chromatographic transmission reference light and the transmitted detection light, transmitting the transmitted chromatographic transmission reference light and the transmitted detection light, sending the transmitted chromatographic transmission delay light path to the chromatographic reflection delay light path, and transmitting the reflected chromatographic transmission delay light path to the chromatographic reflection delay light path;
the chromatographic transmission delay optical path is used for processing the transmitted chromatographic reflection reference light and the transmitted detection light to obtain transmitted chromatographic reflection delay reference light and transmitted detection light; processing the transmitted reference light and the probe light transmitted by the chromatography, the transmitted reference light and the probe light transmitted by the chromatography are transmitted and delayed;
the chromatographic reflection delay optical path is used for processing the reflected chromatographic reflection reference light and the reflected detection light to obtain reflected chromatographic reflection delay reference light and reflected detection light; and processing the reflected chromatographic transmission reference light and the reflected detection light to obtain reflected chromatographic transmission delay reference light and reflected detection light.
3. The apparatus of claim 1, wherein the imaging spectrometer comprises: detecting a light receiving spectrometer and a spectral information imager; wherein the content of the first and second substances,
the detection light receiving spectrometer is connected with the spectral information imager, receives the ultrafast event reference light and the ultrafast event detection light at each angle, records and carries out frequency domain interference to obtain interference fringes and sends the interference fringes to the spectral information imager;
the spectrum information imager is connected with the detection light receiving spectrometer and passes through the interference fringes.
4. The apparatus for multi-angle tomosynthesis recording frequency domain holographic imaging according to claim 1, further comprising: and the focusing lens is positioned between the delay line excitation light path and the ultrafast event position, converges the ultrafast event excitation light and then sends the ultrafast event excitation light to the ultrafast event position.
5. The apparatus for multi-angle tomosynthesis recording frequency domain holographic imaging according to claim 1, further comprising: a beam delay adjuster comprising: an exciting light delay adjusting unit and a detecting light delay adjusting unit; wherein the content of the first and second substances,
the excitation light delay adjusting unit is connected with the Michelson interferometer and the detection light delay adjusting unit, the Michelson interferometer is adjusted at preset time intervals, the multiplied light is transmitted to the adjusted Michelson interferometer through the beam splitting piece to be processed, and reference light and detection light are obtained;
the detection light delay adjusting unit is connected with the exciting light delay adjusting unit, and adjusts the delay line exciting light path and each chromatography delay light path according to the time interval, so that the fundamental frequency light is reflected to the delay line exciting light path through the beam splitting sheet for processing, and the obtained ultrafast event exciting light, the chromatography reflection delay detection light and the chromatography transmission delay detection light synchronously reach the ultrafast event position.
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| CN111307285B (en) * | 2019-12-20 | 2023-09-22 | 深圳大学 | Multi-angle chromatography recording frequency domain holographic imaging method and device |
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