Coherent Raman spectrum detection system combining stimulated Fourier transform

Abstract

The invention relates to a coherent Raman spectrum detection system combining stimulated Fourier transform. The system comprises a light source structure, a beam combining structure, a scanning structure and a detection structure, the light source structure is used for processing an input original pulse to obtain a first main excitation pulse and a first supplementary excitation pulse; the beam combining structure is used for carrying out beam combining treatment on the first main excitation pulse and the first supplementary excitation pulse to obtain a first combined excitation pulse; the scanning structure is used for scanning the first combined excitation pulse to obtain a second combined excitation pulse and a third combined excitation pulse, and transmitting the second combined excitation pulse and the third combined excitation pulse to the detection structure; and the detection structure is used for carrying out combined stimulated excitation on the to-be-detected sample and carrying out detection to obtain a detection result. And the detection wave number range of the coherent Raman spectrum simultaneously comprises a fingerprint area and a high wave number area.

Description

Technical Field

[0001] The present application relates to the technical field of spectral detection, and in particular to a combined stimulated Fourier transform coherent Raman spectroscopy detection system. Background Art

[0002] With the development of nonlinear spectroscopy and microscopy, Fourier transform coherent anti-Stokes Raman spectroscopy microscopy has emerged. It is one of the mainstream technologies for broadband coherent Raman spectroscopy detection and can detect the chemical-specific composition information of the sample to be tested.

[0003] In conventional techniques, a spectral excitation scheme using impulse stimulation or double pulse stimulation is used.

[0004] However, conventional spectral excitation schemes suffer from the problem of limited detectable wavenumber range of the spectrum. Summary of the invention

[0005] Based on this, it is necessary to provide a joint stimulated Fourier transform coherent Raman spectroscopy detection system that can cover the spectrum including both the fingerprint region and the high wave number region in order to solve the above technical problems.

[0006] In a first aspect, the present application provides a joint stimulated Fourier transform coherent Raman spectroscopy detection system, the system comprising: a light source structure, a beam combining structure, a scanning structure and a detection structure;

[0007] The light source structure is used to process the input original pulse to obtain a first main excitation pulse and a first supplementary excitation pulse; the first main excitation pulse is an excitation pulse whose spectral width is extended to a preset value and compressed to a conversion limit, the central wavelength of the first supplementary excitation pulse is separated from the central wavelength of the first main excitation pulse by a preset interval, and the first supplementary excitation pulse is an optical soliton;

[0008] The beam combining structure is used to perform beam combining processing on the first main excitation pulse and the first supplementary excitation pulse to obtain a first joint excitation pulse;

[0009] The scanning structure is used to scan the first joint excitation pulse to obtain a second joint excitation pulse and a third joint excitation pulse, and to inject the second joint excitation pulse and the third joint excitation pulse into the detection structure;

[0010] The detection structure is used to perform joint stimulation and detection on the sample to be detected to obtain a detection result.

[0011] In one of the embodiments, the light source structure includes: a pulse generating device, a light splitting device, a main excitation pulse regulating device and a supplementary excitation pulse regulating device;

[0012] The pulse generating device is used to generate the original pulse;

[0013] The optical splitter is used to perform beam splitting processing on the original pulse to obtain a second main excitation pulse and a second supplementary excitation pulse;

[0014] The main excitation pulse adjustment device is used to adjust the spectrum of the second main excitation pulse to obtain the first main excitation pulse;

[0015] The supplementary excitation pulse adjustment device is used to adjust the spectrum of the second supplementary excitation pulse to obtain the first supplementary excitation pulse.

[0016] In one of the embodiments, the main excitation pulse adjustment device includes: a main excitation pulse wavelength adjustment device and a main excitation pulse compression device;

[0017] The main excitation pulse wavelength adjustment device is used to adjust the wavelength of the second main excitation pulse to obtain a first dispersed main excitation pulse;

[0018] The main excitation pulse compression device is used to perform dispersion compensation and pulse compression on the first dispersed main excitation pulse to obtain the first main excitation pulse.

[0019] In one embodiment, the main excitation pulse wavelength adjustment device includes a first reflector, a second reflector, a third half-wave plate, a main excitation pulse spectrum topography device and a third reflector;

[0020] The first reflector is used to reflect the second main excitation pulse to the second reflector;

[0021] The second reflector is used to reflect the second main excitation pulse reflected by the first reflector to the third half-wave plate;

[0022] The third half-wave plate is used to adjust the polarization direction of the second main excitation pulse reflected by the second reflector to obtain an adjusted main excitation pulse;

[0023] The main excitation pulse spectrum broadening device is used to broaden the spectrum of the adjusted main excitation pulse to obtain the first dispersed main excitation pulse;

[0024] The third reflecting mirror is used to reflect the first dispersed main excitation pulse to the main excitation pulse compression device.

[0025] In one of the embodiments, the main excitation pulse compression device includes a first dispersion prism, a second dispersion prism and a first corner mirror;

[0026] The first dispersion prism and the second dispersion prism are used to perform dispersion compensation and pulse compression on the first dispersion main excitation pulse, and the first dispersion main excitation pulse passes through the first dispersion prism and the second dispersion prism respectively to obtain a second dispersion main excitation pulse;

[0027] The first angle mirror is used to reflect and raise the second dispersion main excitation pulse, so that the second dispersion main excitation pulse passes through the second dispersion prism and the first dispersion prism respectively to obtain the first main excitation pulse.

[0028] In one embodiment, the supplementary excitation pulse adjustment device includes a fourth reflector, a fifth reflector, a fourth half-wave plate, a supplementary excitation pulse spectrum topography device and a first filter;

[0029] The fourth reflecting mirror is used to reflect the second supplementary excitation pulse to the fifth reflecting mirror;

[0030] The fifth reflecting mirror is used to reflect the second supplementary excitation pulse reflected by the fourth reflecting mirror to a fourth half-wave plate;

[0031] The fourth half-wave plate is used to adjust the polarization direction of the second supplementary excitation pulse reflected by the fifth reflector to obtain a first adjusted supplementary excitation pulse;

[0032] The supplementary excitation pulse spectrum broadening device is used to broaden the spectrum of the first adjusted supplementary excitation pulse to obtain the second adjusted supplementary excitation pulse, and obtain optical solitons in the preset long wavelength part of the second adjusted supplementary excitation pulse;

[0033] The first optical filter is used to perform optical filtering on the second adjusted supplementary excitation pulse to filter out the non-soliton part to obtain the first supplementary excitation pulse.

[0034] In one of the embodiments, the optical splitter comprises a first half-wave plate, a first polarization beam splitter, a light block, a second half-wave plate, and a second polarization beam splitter;

[0035] The first half-wave plate is used to adjust the polarization direction of the original pulse to obtain a first adjusted pulse;

[0036] The first polarization beam splitter is used to perform beam splitting processing on the first adjustment pulse to obtain a redundant pulse and a second adjustment pulse;

[0037] The light block is used to block and absorb the redundant pulses;

[0038] The second half-wave plate is used to adjust the polarization direction of the second adjustment pulse to obtain a third adjustment pulse;

[0039] The second polarization beam splitter is used to perform beam splitting processing on the third adjustment pulse to obtain the second main excitation pulse and the second supplementary excitation pulse.

[0040] In one of the embodiments, the beam combining structure includes: a time domain adjustment component, a focus adjustment component and a first dichroic mirror;

[0041] The time domain adjustment component is used to perform time domain adjustment on the first main excitation pulse to obtain a main excitation pulse after time domain adjustment, so that the main excitation pulse after time domain adjustment overlaps with the first supplementary excitation pulse in the time domain at the sample to be tested;

[0042] The focus adjustment component is used to adjust the focus position of the main excitation pulse after the time domain adjustment to obtain a third main excitation pulse, so that the third main excitation pulse and the first supplementary excitation pulse overlap in the focus space at the sample to be tested;

[0043] The first dichroic mirror is used to perform beam combining processing on the third main excitation pulse and the first supplementary excitation pulse to obtain the first combined excitation pulse.

[0044] In one of the embodiments, the scanning structure includes a beam splitter, a first delay component, a second delay component and a delay detection component;

[0045] The beam splitter is used to perform a replication process on the first joint excitation pulse to obtain a first replicated pulse and a second replicated pulse;

[0046] The first delay component is used to perform reflection processing on the first replica pulse to obtain the second joint excitation pulse;

[0047] The second delay component is used to perform reflection and delay scanning processing on the second replica pulse to obtain the third joint excitation pulse;

[0048] The beam splitter is further used to perform beam combining processing on the second joint excitation pulse and the third joint excitation pulse, and emit the combined second joint excitation pulse and the third joint excitation pulse to the detection structure;

[0049] The delay detection component is used to detect and monitor the relative delay between the second joint excitation pulse and the third joint excitation pulse.

[0050] In one embodiment, the detection structure includes an objective lens, a collecting lens and a detection assembly;

[0051] The objective lens is used to inject and tightly focus the second joint excitation pulse and the third joint excitation pulse onto the sample to be tested, and jointly excite the sample to be tested to obtain a first signal light;

[0052] The collecting mirror is used to collect the first signal light to obtain the second signal light;

[0053] The detection component is used to determine the detection result of the joint stimulated Fourier transform coherent Raman spectroscopy of the sample to be tested according to the second signal light.

[0054] The above-mentioned joint stimulated Fourier transform coherent Raman spectroscopy detection system includes: a light source structure, a beam combining structure, a scanning structure and a detection structure; the light source structure is used to process the input original pulse to obtain a first main excitation pulse and a first supplementary excitation pulse; the first main excitation pulse is an excitation pulse whose spectral width is extended to a preset value and compressed to a conversion limit, the central wavelength of the first supplementary excitation pulse is separated from the central wavelength of the first main excitation pulse by a preset interval, and the first supplementary excitation pulse is an optical soliton; the beam combining structure is used to perform beam combining processing on the first main excitation pulse and the first supplementary excitation pulse to obtain a first joint excitation pulse; the scanning structure is used to scan the first joint excitation pulse to obtain a second joint excitation pulse and a third joint excitation pulse, and the second joint excitation pulse and the third joint excitation pulse are incident on the detection structure; the detection structure is used to perform joint stimulated excitation and detection on the sample to be tested to obtain a detection result. Since the light source structure can generate a first main excitation pulse with a wider spectral conversion limit and a first supplementary excitation pulse separated from the central wavelength of the first main excitation pulse by a certain distance, the detection wavenumber range of the coherent Raman spectrum includes both the fingerprint region and the high wavenumber region. Compared with the existing spectral excitation schemes, the detection wavenumber range is no longer limited to the fingerprint region of impact stimulation or the flexible and adjustable but narrow wavenumber region of double pulse stimulation, thereby expanding the detection range of the sample to be tested. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the drawings required for use in the embodiments of the present application or related technical descriptions will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0056] Figure 1 The frequency domain principle diagram of a solid femtosecond pulse impact-stimulated Fourier transform coherent anti-Stokes Raman spectroscopy detection system in one embodiment;

[0057] Figure 2 A frequency domain principle diagram of a Fourier transform coherent anti-Stokes Raman spectroscopy detection system for impact-stimulated optical fiber femtosecond pulses after spectrum topography in one embodiment;

[0058] Figure 3It is a frequency domain principle diagram of a fiber femtosecond pulse double-pulse stimulated Fourier transform coherent anti-Stokes Raman spectroscopy detection system in one embodiment;

[0059] Figure 4 is a structural block diagram of joint stimulated Fourier transform coherent Raman spectroscopy detection in one embodiment;

[0060] Figure 5 It is a structural block diagram of joint stimulated Fourier transform coherent Raman spectroscopy detection in another embodiment;

[0061] Figure 6 It is a structural block diagram of joint stimulated Fourier transform coherent Raman spectroscopy detection in another embodiment;

[0062] Figure 7 It is a structural block diagram of joint stimulated Fourier transform coherent Raman spectroscopy detection in another embodiment;

[0063] Figure 8 It is a structural block diagram of joint stimulated Fourier transform coherent Raman spectroscopy detection in another embodiment;

[0064] Fig. 9 It is a frequency domain principle diagram of a fiber femtosecond pulse combined with stimulated Fourier transform coherent anti-Stokes Raman spectroscopy detection system in one embodiment;

[0065] Fig.10 A time domain schematic diagram of coherent Raman oscillation energy levels and coherent anti-Stokes scattering signals generated when a combined excitation pulse interacts with a sample to be tested in one embodiment;

[0066] Fig.11 It is a time domain principle diagram of a fiber femtosecond pulse combined with stimulated Fourier transform coherent anti-Stokes Raman spectroscopy detection system in one embodiment;

[0067] Reference numerals:

[0068] Light source structure: 10; Beam combining structure: 20; Scanning structure: 30;

[0069] Detection structure: 40; Pulse generating device: 101; Spectral splitting device: 102;

[0070] Main excitation pulse adjustment device: 11; Main excitation pulse wavelength adjustment device: 103;

[0071] Main excitation pulse compression device: 104; Supplementary excitation pulse adjustment device: 105;

[0072] First half-wave plate: 121; First polarization beam splitter: 122; Light block: 123;

[0073] Second half-wave plate: 124; Second polarization beam splitter: 125;

[0074] First reflecting mirror: 131; Second reflecting mirror: 132; Third half-wave plate: 133;

[0075] Main excitation pulse spectrum topography device: 134; Third reflecting mirror: 135;

[0076] First dispersion prism: 141; Second dispersion prism: 142;

[0077] First corner mirror: 143; Fourth reflecting mirror: 151; Fifth reflecting mirror: 152;

[0078] Fourth half-wave plate: 153; Supplementary excitation pulse spectrum topography device: 154;

[0079] First filter: 155; Time domain adjustment component: 201; Focus adjustment component: 202;

[0080] First dichroic mirror: 203; First lens: 221; Second lens: 222;

[0081] Eighth reflecting mirror: 223; Beam splitter: 301; First delay component: 302;

[0082] The second delay component: 303; The delay detection component: 304; The tenth reflector: 331;

[0083] Curved mirror: 332; Resonant scanning mirror: 333; He-Ne laser: 341;

[0084] Second dichroic mirror: 342; Third dichroic mirror: 343; Third lens: 344;

[0085] First photodetector: 345; Objective lens: 401; Sample to be tested: 402;

[0086] Collecting mirror: 403; Detection assembly: 404; Second filter: 441;

[0087] Fourth lens: 442; Second photodetector: 443. DETAILED DESCRIPTION

[0088] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0089] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0090] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0091] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0092] With the development of nonlinear spectroscopy and microscopy, Fourier transform coherent anti-Stokes Raman spectroscopy microscopy has emerged. This technology has the advantages of broadband spectral detection, high spectral resolution (can reach the natural broadening limit), immunity to non-resonant background noise and single-pixel high-speed detector detection, and is one of the mainstream technologies for coherent Raman spectroscopy detection. In traditional technologies, impact-stimulated spectral excitation schemes or double-pulse-stimulated spectral excitation schemes are usually used.

[0093] Among them, if the spectral excitation scheme of impact stimulation is to achieve a sufficiently wide detection wavenumber range, the spectrum requirements of the light source used are very stringent, because the maximum wavenumber that can be detected by the impact stimulation scheme depends on the spectral width of the conversion-limited excitation pulse. Therefore, ultra-wideband spectrum conversion-limited excitation pulses are required for impact stimulation excitation, and such light sources are usually extremely difficult to obtain. At present, researchers at home and abroad use titanium sapphire solid-state lasers with an output pulse width of about The frequency domain principle diagram is as follows: Figure 1 As shown, the spectral coverage is concentrated in the fingerprint region with lower wavenumbers ( ), it is difficult to excite the high wave number region ( ) (there are a lot of Raman signals of biochemical substances in both the fingerprint region and the high wavenumber region). In addition, solid-state femtosecond laser equipment is bulky and expensive, which is not conducive to actual spectral detection application scenarios. In order to overcome the above difficulties, domestic and foreign scholars have used a method based on fiber femtosecond pulse spectrum extension to expand the excitation pulse spectrum while ensuring that it can be compressed to the transformation limit, barely making the detection spectrum of the impact stimulation scheme cover the high wavenumber region. The frequency domain principle diagram is shown below. Figure 2 As shown. However, due to the limitations of the spectrum extension technology itself, in order to compress the pulse to the transformation limit, the spectrum cannot be broadened indefinitely, otherwise the high-order dispersion will be quite significant. As a result, the excitation energy in the high wave number region is insufficient and the detection signal-to-noise ratio is seriously attenuated.

[0094] In addition, in the dual-pulse stimulated spectral excitation scheme, the laser output is initially divided into two paths, one of which is adjusted by introducing a spectrum extension module to make its central wavelength separated from the other by a preset value. The preset value is related to the detection wave number region to be excited and can be flexibly adjusted according to demand. Finally, the two beams are combined as dual-pulse excitation light, and its frequency domain principle diagram is shown in the figure below. Figure 3 As shown. For example, as long as the central wavelength interval of the dual pulses is set in the high wavenumber region, the coherent Raman signal in the corresponding high wavenumber region can be excited, solving the problem that the impact stimulation is difficult to detect the high wavenumber region. However, the dual pulse stimulation scheme also has certain limitations. Although its detection wavenumber region is flexible and adjustable, it is limited by the spectral width of each dual pulse, and the overall width of the detectable wavenumber is still limited. It is still difficult to simultaneously detect the coherent Raman signals in the fingerprint region and the high wavenumber region.

[0095] In summary, the traditional spectral excitation scheme has the problem of insufficient detectable wavenumbers of the spectrum.

[0096] In one embodiment, Figure 4 As shown, a joint stimulated Fourier transform coherent Raman spectroscopy detection system is provided, and the system includes: a light source structure 10, a beam combining structure 20, a scanning structure 30 and a detection structure 40; the light source structure 10 is used to process the input original pulse to obtain a first main excitation pulse and a first supplementary excitation pulse; the first main excitation pulse is an excitation pulse whose spectral width is extended to a preset value and compressed to a conversion limit, the central wavelength of the first supplementary excitation pulse is separated from the central wavelength of the first main excitation pulse by a preset interval, and the first supplementary excitation pulse is an optical soliton; the beam combining structure 20 is used to perform beam combining processing on the first main excitation pulse and the first supplementary excitation pulse to obtain a first joint excitation pulse; the scanning structure 30 is used to scan the first joint excitation pulse to obtain a second joint excitation pulse and a third joint excitation pulse, and the second joint excitation pulse and the third joint excitation pulse are incident on the detection structure 40; the detection structure 40 is used to perform joint stimulated excitation and detection on the sample 402 to be tested to obtain a detection result.

[0097] Among them, optical solitons are formed by the balance of chromatic effect and nonlinear effect of pulses in optical fibers. They can maintain their shape, amplitude and speed unchanged when transmitted in optical fibers, and are naturally transformation-limited pulses.

[0098] In an embodiment of the present application, the light source structure 10 may include a light source emitter and a light source processing device, the light source emitter is used to generate an original pulse, and the original pulse is incident on the light source processing device, so that the light source processing device processes the input original pulse to obtain a first main excitation pulse and a first supplementary excitation pulse, and the first main excitation pulse and the first supplementary excitation pulse are respectively incident on the beam combining structure 20. Optionally, the light source processing device can perform beam splitting processing, wavelength adjustment, compression processing, etc. on the original pulse, so that the first main excitation pulse is an excitation pulse whose spectral width is extended to a preset value and compressed to a transformation limit, and the central wavelength of the first supplementary excitation pulse is separated from the central wavelength of the first main excitation pulse by a preset spacing. Optionally, the preset spacing can be set according to the high wave number excited according to actual needs.

[0099] Optionally, the light source structure 10 may incident the first main excitation pulse onto the first receiving point of the beam combining structure 20 through the first incident channel, and incident the first supplementary excitation pulse onto the second receiving point of the beam combining structure 20 through the second incident channel.

[0100] It should be noted that in the embodiment of the present application, the excitation of the fingerprint region is completed by the main excitation pulse providing pump light and Stokes light, and the excitation of the high wavenumber region is completed by the main excitation pulse providing pump light and the supplementary excitation pulse providing Stokes light.

[0101] In the embodiment of the present application, the beam combining structure 20 adjusts the first main excitation pulse to obtain the third main excitation pulse, so that the third main excitation pulse and the first supplementary excitation pulse are matched in time domain and focus at the sample to be tested 402, and combines the third main excitation pulse with the first supplementary excitation pulse to obtain a first joint excitation pulse. Further, the first joint excitation pulse is incident on the scanning structure 30.

[0102] In the embodiment of the present application, the scanning structure 30 replicates and delays the first joint excitation pulse to obtain a second joint excitation pulse and a third joint excitation pulse with relative delay, and monitors the relative delay of the second joint excitation pulse and the third joint excitation pulse in real time. Further, the second joint excitation pulse and the third joint excitation pulse are incident on the detection structure 40.

[0103] In the embodiment of the present application, the detection structure 40 jointly excites the sample 402 through the second joint excitation pulse and the third joint excitation pulse, thereby determining the detection result of the sample 402. Optionally, the detection result of the sample 402 includes Raman spectrum information of the biochemical substance to be detected.

[0104] The above-mentioned joint stimulated Fourier transform coherent Raman spectroscopy detection system includes: a light source structure, a beam combining structure, a scanning structure and a detection structure; the light source structure is used to process the input original pulse to obtain a first main excitation pulse and a first supplementary excitation pulse; the first main excitation pulse is an excitation pulse whose spectral width is extended to a preset value and compressed to a conversion limit, the central wavelength of the first supplementary excitation pulse is separated from the central wavelength of the first main excitation pulse by a preset interval, and the first supplementary excitation pulse is an optical soliton; the beam combining structure is used to perform beam combining processing on the first main excitation pulse and the first supplementary excitation pulse to obtain a first joint excitation pulse; the scanning structure is used to scan the first joint excitation pulse to obtain a second joint excitation pulse and a third joint excitation pulse, and the second joint excitation pulse and the third joint excitation pulse are incident on the detection structure; the detection structure is used to perform joint stimulated excitation and detection on the sample to be tested to obtain a detection result. Since the light source structure can generate a first main excitation pulse with a wider spectral conversion limit and a first supplementary excitation pulse separated from the central wavelength of the first main excitation pulse by a certain distance, the detection wavenumber range of the coherent Raman spectrum includes both the fingerprint region and the high wavenumber region. Compared with the existing spectral excitation schemes, the detection wavenumber range is no longer limited to the fingerprint region of impact stimulation or the flexible and adjustable but narrow wavenumber region of double pulse stimulation, thereby expanding the detection range of the sample to be tested.

[0105] In one embodiment, Figure 5 As shown, the light source structure 10 includes: a pulse generating device 101, a spectrometer 102, a main excitation pulse adjusting device 11 and a supplementary excitation pulse adjusting device 105; the pulse generating device 101 is used to generate an original pulse; the spectrometer 102 is used to perform beam splitting on the original pulse to obtain a second main excitation pulse and a second supplementary excitation pulse; the main excitation pulse adjusting device 11 is used to adjust the spectrum of the second main excitation pulse to obtain a first main excitation pulse; the supplementary excitation pulse adjusting device is used to adjust the spectrum of the second supplementary excitation pulse to obtain a first supplementary excitation pulse.

[0106] In the embodiment of the present application, the pulse generating device 101 is specifically a fiber femtosecond pulse generating device 101, and the pulse generating device 101 emits an original pulse to the optical splitter 102, so that the optical splitter 102 performs energy control and beam splitting processing on the original pulse to obtain a second main excitation pulse and a second supplementary excitation pulse, and the optical splitter 102 injects the second main excitation pulse into the main excitation pulse adjusting device 11, and injects the second supplementary excitation pulse into the supplementary excitation pulse adjusting device. The main excitation pulse adjusting device 11 contains a first photonic crystal fiber, and the spectrum of the second main excitation pulse is adjusted by using the nonlinear effect and dispersion effect of the photonic crystal fiber to obtain the first main excitation pulse, and the supplementary excitation pulse adjusting device 105 contains a second photonic crystal fiber, and the wavelength of the second supplementary excitation pulse is adjusted by using the nonlinear effect and dispersion effect of the photonic crystal fiber to obtain the first supplementary excitation pulse. Optionally, the original pulse is a conversion-limited femtosecond pulse, the first main excitation pulse is a wider-band conversion-limited femtosecond pulse, and the first supplementary excitation pulse is a conversion-limited soliton femtosecond pulse with a longer wavelength.

[0107] In the above-mentioned application embodiment, the second main excitation pulse and the second supplementary excitation pulse are obtained by beam splitting the original pulse. Further, the second main excitation pulse and the second supplementary excitation pulse are processed to obtain a wider-bandwidth transformation-limited femtosecond pulse and a longer-wavelength transformation-limited soliton femtosecond pulse, thereby increasing the spectral width of the main excitation pulse and red-shifting the central wavelength of the supplementary excitation pulse to a preset value.

[0108] In one embodiment, Figure 5 As shown, the main excitation pulse adjustment device 11 includes: a main excitation pulse wavelength adjustment device 103 and a main excitation pulse compression device 104; the main excitation pulse wavelength adjustment device 103 is used to adjust the wavelength of the second main excitation pulse to obtain a first dispersed main excitation pulse; the main excitation pulse compression device 104 is used to perform dispersion compensation and pulse compression on the first dispersed main excitation pulse to obtain the first main excitation pulse.

[0109] In the embodiment of the present application, the main excitation pulse wavelength adjustment device 103 contains a first photonic crystal fiber. By utilizing the nonlinear effect and dispersion effect of the photonic crystal fiber, the wavelength of the second main excitation pulse can be adjusted to obtain a first dispersed main excitation pulse, and the first dispersed main excitation pulse is incident on the main excitation pulse compression device 104, so that the main excitation pulse compression device 104 performs dispersion compensation and pulse compression on the first dispersed main excitation pulse to obtain the first main excitation pulse.

[0110] In the above application embodiment, the wavelength adjustment, dispersion compensation and pulse compression are performed on the second main excitation pulse in sequence, so as to more accurately obtain a wider bandwidth transformation-limited femtosecond pulse.

[0111] In one embodiment, Figure 5 As shown, the main excitation pulse wavelength adjustment device 103 includes a first reflector 131, a second reflector 132, a third half-wave plate 133, a main excitation pulse spectrum expansion device 134 and a third reflector 135; the first reflector 131 is used to reflect the second main excitation pulse to the second reflector 132; the second reflector 132 is used to reflect the second main excitation pulse reflected by the first reflector 131 to the third half-wave plate 133; the third half-wave plate 133 is used to adjust the polarization direction of the second main excitation pulse reflected by the second reflector 132 to obtain an adjusted main excitation pulse; the main excitation pulse spectrum expansion device 134 is used to broaden the spectrum of the adjusted main excitation pulse to obtain a first dispersed main excitation pulse; the third reflector 135 is used to reflect the first dispersed main excitation pulse to the main excitation pulse compression device 104.

[0112] In the embodiment of the present application, the second main excitation pulse passes through the first reflector 131, the second reflector 132, the third half-wave plate 133, the main excitation pulse spectrum extension device 134 and the third reflector 135 in sequence. After the optical splitter 102 makes the second main excitation pulse incident on the first reflector 131, the first reflector 131 reflects the second main excitation pulse to the second reflector 132. Further, the second reflector 132 reflects the second main excitation pulse to the third half-wave plate 133, so that the third half-wave plate 133 adjusts the polarization direction of the second main excitation pulse to obtain an adjusted main excitation pulse that matches the main axis direction of the first photonic crystal fiber in the main excitation pulse spectrum extension device 134. The main excitation pulse spectrum extension device 134 broadens the spectrum of the adjusted main excitation pulse to obtain a first dispersed main excitation pulse, and makes the first dispersed main excitation pulse incident on the third reflector 135. Further, the third reflector 135 reflects the first dispersed main excitation pulse to the main excitation pulse compression device 104.

[0113] In the above-mentioned application embodiment, the first reflector and the second reflector introduce four adjustment degrees of freedom to the light beam of the main excitation pulse, which facilitates the adjustment and alignment of the direction and landing point of the main excitation pulse beam. In addition, the main excitation pulse spectrum extension device is a first photonic crystal fiber, which uses nonlinear effects and dispersion effects to broaden the spectrum of the first dispersed main excitation pulse to a preset value.

[0114] In one embodiment, Figure 5As shown, the main excitation pulse compression device 104 includes a first dispersion prism 141, a second dispersion prism 142 and a first angle mirror 143; the first dispersion prism 141 and the second dispersion prism 142 are used to perform dispersion compensation and pulse compression on the first dispersion main excitation pulse, and the first dispersion main excitation pulse passes through the first dispersion prism 141 and the second dispersion prism 142 respectively to obtain the second dispersion main excitation pulse; the first angle mirror 143 is used to reflect and raise the second dispersion main excitation pulse, so that the second dispersion main excitation pulse passes through the second dispersion prism 142 and the first dispersion prism 141 respectively to obtain the first main excitation pulse.

[0115] In the embodiment of the present application, the first dispersion main excitation pulse is incident on the first dispersion prism 141 and the second dispersion prism 142 in sequence, the third reflector 135 reflects the first dispersion main excitation pulse to the first dispersion prism 141, the first dispersion prism 141 and the second dispersion prism 142 perform dispersion compensation and pulse compression on the first dispersion main excitation pulse, and the first dispersion main excitation pulse passes through the first dispersion prism 141 and the second dispersion prism 142 respectively to obtain the second dispersion main excitation pulse, the first angle mirror 143 reflects and raises the second dispersion main excitation pulse, and further, the second dispersion main excitation pulse passes through the second dispersion prism 142 and the first dispersion prism 141 respectively to obtain the first main excitation pulse. It should be noted that after the second dispersion main excitation pulse passes through the second dispersion prism 142 and the first dispersion prism 141 respectively, due to the change in the light beam height, the first main excitation pulse will no longer interact with the third reflector 135, and the first main excitation pulse is then incident on the beam combining structure 20.

[0116] In the above-mentioned application embodiment, the first dispersion prism and the second dispersion prism form a dispersion compensation prism pair, which can compensate for the dispersion of the first dispersion main excitation pulse introduced by the first photonic crystal fiber by having different refractive index responses of their own materials to different frequency lights. The dispersion main excitation pulse passes through the dispersion compensation prism pair twice to obtain the first main excitation pulse, and the pulse width is compressed to the transformation limit, thereby ensuring the excitation efficiency of Raman oscillation.

[0117] In one embodiment, Figure 5As shown, the above-mentioned supplementary excitation pulse adjustment device 105 includes a fourth reflector 151, a fifth reflector 152, a fourth half-wave plate 153, a supplementary excitation pulse spectrum extension device 154 and a first filter 155; the fourth reflector 151 is used to reflect the second supplementary excitation pulse to the fifth reflector 152; the fifth reflector 152 is used to reflect the second supplementary excitation pulse reflected by the fourth reflector 151 to the fourth half-wave plate 153; the fourth half-wave plate 153 is used to adjust the polarization direction of the second supplementary excitation pulse reflected by the fifth reflector 152 to obtain a first adjusted supplementary excitation pulse; the supplementary excitation pulse spectrum extension device 154 is used to broaden the spectrum of the first adjusted supplementary excitation pulse to obtain a second adjusted supplementary excitation pulse, and obtain optical solitons in the preset long wavelength part of the second adjusted supplementary excitation pulse; the first filter 155 is used to optically filter the second adjusted supplementary excitation pulse, filter out the non-soliton part, and obtain the first supplementary excitation pulse.

[0118] In the embodiment of the present application, the fourth reflector 151 reflects the second supplementary excitation pulse to the fifth reflector 152, so that the fifth reflector 152 reflects the second supplementary excitation pulse to the fourth half-wave plate 153. Further, the fourth half-wave plate 153 adjusts the polarization direction of the second supplementary excitation pulse to obtain a first adjusted supplementary excitation pulse to match the main axis direction of the second photonic crystal fiber in the supplementary excitation pulse spectrum extension device 154. Further, the supplementary excitation pulse spectrum extension device 154 broadens the spectrum of the first adjusted supplementary excitation pulse to obtain a second adjusted supplementary excitation pulse, obtains an optical soliton in a preset long wavelength portion of the second adjusted supplementary excitation pulse, and injects the second adjusted supplementary excitation pulse into the first filter 155, so that the first filter 155 performs optical filtering on the second adjusted supplementary excitation pulse, filters out the non-soliton portion, obtains the first supplementary excitation pulse, and injects the first supplementary excitation pulse into the beam combining structure 20.

[0119] In the above embodiment, the fourth reflector and the fifth reflector introduce four adjustment degrees of freedom to the light beam of the second supplementary excitation pulse, which facilitates the adjustment and alignment of the direction and landing point of the supplementary excitation pulse light beam. The supplementary excitation pulse spectrum topology device is a second photonic crystal fiber, which broadens the spectrum of the supplementary excitation pulse through nonlinear effects and dispersion effects, and obtains optical solitons in the preset long wavelength part.

[0120] In one embodiment, Figure 5As shown, the above-mentioned spectroscopic device 102 includes a first half-wave plate 121, a first polarization beam splitter 122, a light block 123, a second half-wave plate 124 and a second polarization beam splitter 125; the first half-wave plate 121 is used to adjust the polarization direction of the original pulse to obtain a first adjustment pulse; the first polarization beam splitter 122 is used to perform beam splitting processing on the first adjustment pulse to obtain a redundant pulse and a second adjustment pulse; the light block 123 is used to block and absorb the redundant pulse; the second half-wave plate 124 is used to adjust the polarization direction of the second adjustment pulse to obtain a third adjustment pulse; the second polarization beam splitter 125 is used to perform beam splitting processing on the third adjustment pulse to obtain a second main excitation pulse and a second supplementary excitation pulse.

[0121] Among them, the half-wave plate uses the birefringence property of the material to decompose the incident light beam into two mutually orthogonal polarization components, and imposes an optical path difference of half a wavelength between the two orthogonal polarization components; the polarization beam splitter is an optical device that uses the polarization characteristics of light to separate or combine light waves of different polarization states.

[0122] In an embodiment of the present application, an original pulse is incident on a first half-wave plate 121, which divides the original pulse into two light beams with orthogonal polarization directions. The two light beams propagate at different speeds inside the half-wave plate and then merge again to obtain a first adjustment pulse. The first adjustment pulse is incident on a first polarization beam splitter 122, which uses the polarization characteristics of light to perform beam splitting processing on the first adjustment pulse to obtain a redundant pulse and a second adjustment pulse, and the redundant pulse is incident on a light block 123, and the second adjustment pulse is incident on a second half-wave plate 124, so that the light block 123 blocks and absorbs the redundant pulse, and the second half-wave plate 124 adjusts the polarization direction of the second adjustment pulse to obtain a third adjustment pulse, and the third adjustment pulse is incident on a second polarization beam splitter 125; further, the second polarization beam splitter 125 performs beam splitting processing on the third adjustment pulse to obtain a second main excitation pulse and a second supplementary excitation pulse.

[0123] In the above-mentioned application embodiment, the absolute energy of the second main excitation pulse and the second supplementary excitation pulse are controlled respectively by a combination of two sets of half-wave plates and a polarization beam splitter, thereby being able to control the wavelength adjustment results of the main excitation pulse wavelength adjustment device and the supplementary excitation pulse wavelength adjustment device.

[0124] In one embodiment, Figure 6As shown, the above-mentioned beam combining structure includes: a time domain adjustment component 201, a focus adjustment component 202 and a first dichroic mirror 203; the time domain adjustment component 201 is used to perform time domain adjustment on the first main excitation pulse to obtain a main excitation pulse after time domain adjustment, so that the main excitation pulse after time domain adjustment and the first supplementary excitation pulse overlap in time domain at the sample to be tested 402; the focus adjustment component 202 is used to adjust the focus position of the main excitation pulse after time domain adjustment to obtain a third main excitation pulse, so that the third main excitation pulse and the first supplementary excitation pulse overlap in focus space at the sample to be tested 402; the first dichroic mirror 203 is used to perform beam combining processing on the third main excitation pulse and the first supplementary excitation pulse to obtain a first joint excitation pulse.

[0125] In the embodiment of the present application, the time domain adjustment component 201 performs time domain adjustment on the first main excitation pulse to obtain a main excitation pulse after time domain adjustment, so that the main excitation pulse after time domain adjustment coincides with the first supplementary excitation pulse in the time domain at the sample to be tested 402, and the main excitation pulse after time domain adjustment is incident on the focus adjustment component 202; the focus adjustment component 202 adjusts the focal position of the main excitation pulse after time domain adjustment to obtain a third main excitation pulse, so that the third main excitation pulse coincides with the supplementary excitation pulse in the focal space at the sample to be tested 402, and the third main excitation pulse is incident on the first dichroic mirror 203; the first dichroic mirror 203 performs beam combining processing on the third main excitation pulse and the first supplementary excitation pulse to obtain a first joint excitation pulse, and the first joint excitation pulse is incident on the scanning structure 30.

[0126] Optional, such as Figure 6 As shown, the time domain adjustment component 201 includes a sixth reflector, a second angle mirror and a seventh reflector; the sixth reflector is used to reflect the first main excitation pulse to the second angle mirror; the second angle mirror is used to reflect the first main excitation pulse reflected by the sixth reflector to the seventh reflector; the seventh reflector is used to reflect the first main excitation pulse reflected by the second angle mirror to the focus adjustment component 202 to obtain the main excitation pulse after time domain adjustment. By changing the front and rear positions of the second angle mirror, the optical path of the main excitation pulse reflected by the sixth reflector in the second angle mirror can be changed.

[0127] Optionally, the focus adjustment component 202 includes a first lens 221, a second lens 222 and an eighth reflector 223; the optical axes of the first lens 221 and the second lens 222 are located in the same straight line and coincide with the main excitation pulse beam, the first lens 221 and the second lens 222 adjust the focal position of the main excitation pulse at the sample to be tested 402 to obtain a third main excitation pulse, and the third main excitation pulse is incident on the eighth reflector 223, which is used to reflect the third main excitation pulse to the first dichroic mirror 203.

[0128] In the above-mentioned application embodiment, the first main excitation pulse is adjusted in time domain and focus, so that the main excitation pulse after time domain adjustment and the first supplementary excitation pulse overlap in time domain at the sample to be tested, and overlap in focal space at the sample to be tested, thereby ensuring the effectiveness and accuracy of exciting the sample to be tested.

[0129] In one embodiment, Figure 7 As shown, the scanning structure 30 includes a beam splitter 301, a first delay component 302, a second delay component 303 and a delay detection component 304; the beam splitter 301 is used to replicate the first joint excitation pulse to obtain a first replica pulse and a second replica pulse; the first delay component 302 is used to reflect the first replica pulse to obtain a second joint excitation pulse; the second delay component 303 is used to reflect and delay scan the second replica pulse to obtain a third joint excitation pulse; the beam splitter 301 is also used to combine the second joint excitation pulse and the third joint excitation pulse, and emit the combined second joint excitation pulse and the third joint excitation pulse to the detection structure 40; the delay detection component 304 is used to detect and monitor the relative delay between the second joint excitation pulse and the third joint excitation pulse.

[0130] In the embodiment of the present application, a first joint excitation pulse is incident on the beam splitter 301, the beam splitter 301 replicates the first joint excitation pulse to obtain a first replicated pulse and a second replicated pulse, and the first replicated pulse is incident on the first delay component 302, and the second replicated pulse is incident on the second delay component 303; the first delay component 302 reflects the first replicated pulse to obtain a second joint excitation pulse, and the second joint excitation pulse is incident on the beam splitter 301, the second delay component 303 reflects and delays the second replicated pulse to obtain a third joint excitation pulse, and the third joint excitation pulse is incident on the beam splitter 301; the beam splitter 301 combines the second joint excitation pulse and the third joint excitation pulse, and emits the combined second joint excitation pulse and the third joint excitation pulse to the detection structure 40.

[0131] Optional, such as Figure 7 As shown, the second delay component 303 includes a tenth reflector 331, a curved mirror 332 and a resonant scanning mirror 333; the second replica pulse is reflected by the tenth reflector 331, the curved mirror 332, the resonant scanning mirror 333, the curved mirror 332 and the tenth reflector 331 in sequence to obtain a third joint excitation pulse and return to the beam splitter 301. The resonant scanning mirror 333 controls the relative delay between the joint excitation pulses, providing a prerequisite for Fourier transform detection.

[0132] Optional, such as Figure 7As shown, the time delay detection component 304 includes a helium-neon laser 341, a second dichroic mirror 342, a third dichroic mirror 343, a third lens 344 and a first photodetector 345; the helium-neon laser 341 is used to provide a stable single-frequency laser light source to obtain a continuous laser, and the relative delay between the second joint excitation pulse and the third joint excitation pulse is measured by using the principle of single-frequency laser interference; the second dichroic mirror 342 is used to combine the first joint excitation pulse with the continuous laser, and the continuous laser will undergo the same beam splitting replication, relative delay scanning and beam combining process as the first joint excitation pulse, and finally obtain the combined first delayed continuous laser after the beam combiner. and the second delayed continuous laser; the relative delay between the first delayed continuous laser and the second delayed continuous laser and the relative delay between the second joint excitation pulse and the third joint excitation pulse are always consistent; the third dichroic mirror 343 is used to separate the second and third joint excitation pulses from the first and second delayed continuous lasers; the third lens 344 is used to focus the combined continuous laser on the detection target surface of the first photodetector 345; the first photodetector 345 is used to detect the interference signal intensity between the first delayed continuous laser and the second delayed continuous laser to resolve the relative delay amount. The correct relative delay information of the joint excitation pulses provides a guarantee for the accuracy of Fourier transform spectrum detection.

[0133] In the above application embodiment, the first joint excitation pulse is replicated, reflected and delayed scanned to obtain the second joint excitation pulse and the third joint excitation pulse, and the relative delay between the second joint excitation pulse and the third joint excitation pulse is detected to ensure the feasibility and accuracy of spectral detection.

[0134] In one embodiment, Figure 8 As shown, the detection structure 40 includes an objective lens 401, a collecting mirror 403 and a detection component 404; the objective lens 401 is used to inject and tightly focus the second joint excitation pulse and the third joint excitation pulse onto the sample to be tested 402, and perform joint stimulated excitation on the sample to be tested 402 to obtain a first signal light; the collecting mirror 403 is used to collect the first signal light to obtain a second signal light; the detection component 404 is used to determine the coherent Raman spectrum detection result of the sample to be tested 402 according to the second signal light.

[0135] The sample 402 to be tested is a sample to be tested for coherent Raman spectroscopy.

[0136] In an embodiment of the present application, the sample to be tested 402 is arranged between the objective lens 401 and the collecting lens 403. The second joint excitation pulse and the third joint excitation pulse after being combined are collected and tightly focused by the objective lens 401, so that the sample to be tested 402 is jointly stimulated to obtain a first signal light. The collecting lens 403 collects the first signal light generated by the sample to be tested 402 to obtain a second signal light, and the second signal light is incident on the detection component 404; the detection component 404 determines the coherent Raman spectrum detection result of the sample to be tested 402 according to the second signal light.

[0137] Optional, such as Figure 8 As shown, the detection component 404 includes: a second filter 441, a fourth lens 442 and a second photodetector 443; the second filter 441 is used to perform optical filtering on the second signal light, filter out the residual second joint excitation pulse and the third joint excitation pulse, and obtain the third signal light; the fourth lens 442 is used to focus the third signal light on the detection target surface of the second photodetector 443; the second photodetector 443 is used to perform detection processing according to the third signal light to determine the coherent Raman spectrum detection result of the sample to be tested 402. The third signal light is the short-wave anti-Stokes scattering after the second filter 441 performs long-wave filtering processing.

[0138] Optionally, specific information of the sample 402 to be tested is obtained according to the coherent Raman spectrum detection result.

[0139] In the embodiment of the present application, the frequency domain principle diagram of the embodiment of the present application is as follows: Fig. 9 As shown, the excitation light of the system is obtained by the same fiber femtosecond pulse through two different spectrum topology modules, which respectively generate the main excitation pulse and the supplementary excitation pulse, and merge them into a joint excitation pulse to irradiate the sample to be tested 402. The main excitation pulse has a relatively wide spectrum and is compressed to the transformation limit, which can excite Raman oscillation in the fingerprint area; the supplementary excitation pulse is a relatively narrow spectrum optical soliton, which can cooperate with the main excitation pulse to excite Raman oscillation in the high wave number area. Fig.10 As shown, if the angular frequency of Raman oscillation is After a single joint excitation pulse is incident on the sample 402 to be tested, the sample molecules are stimulated to generate Raman oscillations. At the same time, the main excitation pulse is used as the probe light to interact with the Raman oscillation of the molecule The time domain principle of the combined stimulated Fourier transform coherent Raman spectroscopy detection system is as follows: Fig.11 As shown, by replication and delay, the second combined excitation pulse and delay The third combined excitation pulses are incident on the sample 402 to stimulate Raman oscillations. and , and In the third joint excitation pulse After interference occurs, the Raman oscillation of the molecule The form continues. The constructive or destructive interference depends on the relative delay between the second joint excitation pulse and the third joint excitation pulse. , and obtain the coherent anti-Stokes signal of corresponding intensity. By scanning the relative delay , we can get the time domain interference pattern of the coherent anti-Stokes signal, such as Fig.11 (c) shows that the coherent anti-Stokes Raman spectrum of the sample 402 to be tested can be obtained by Fourier transforming the time domain interference pattern.

[0140] In the above application embodiments, based on the combined stimulation scheme provided by the light source structure, beam combining structure and scanning structure, when using a relatively lightweight and low-cost fiber femtosecond source, the coherent Raman spectroscopy detection range can cover both the fingerprint region and the high wavenumber region.

[0141] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this application.

[0142] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A combined stimulated Fourier transform coherent Raman spectroscopy detection system, characterized in that: The system comprises: a light source structure, a beam combining structure, a scanning structure and a detection structure; The light source structure is used to process the input original pulse to obtain a first main excitation pulse and a first supplementary excitation pulse; the first main excitation pulse is an excitation pulse whose spectral width is extended to a preset value and compressed to a conversion limit, the central wavelength of the first supplementary excitation pulse is separated from the central wavelength of the first main excitation pulse by a preset interval, and the first supplementary excitation pulse is an optical soliton; The beam combining structure is used to perform beam combining processing on the first main excitation pulse and the first supplementary excitation pulse to obtain a first joint excitation pulse; The scanning structure is used to scan the first joint excitation pulse to obtain a second joint excitation pulse and a third joint excitation pulse, and to inject the second joint excitation pulse and the third joint excitation pulse into the detection structure; The detection structure is used to perform joint stimulation and detection on the sample to be detected to obtain the detection result.

2. The combined stimulated Fourier transform coherent Raman spectroscopy detection system according to claim 1, characterized in that: The light source structure includes: a pulse generating device, a light splitting device, a main excitation pulse regulating device and a supplementary excitation pulse regulating device; The pulse generating device is used to generate the original pulse; The optical splitter is used to perform beam splitting processing on the original pulse to obtain a second main excitation pulse and a second supplementary excitation pulse; The main excitation pulse adjustment device is used to adjust the spectrum of the second main excitation pulse to obtain the first main excitation pulse; The supplementary excitation pulse adjustment device is used to adjust the spectrum of the second supplementary excitation pulse to obtain the first supplementary excitation pulse.

3. The combined stimulated Fourier transform coherent Raman spectroscopy detection system according to claim 2, characterized in that: The main excitation pulse adjustment device includes: a main excitation pulse wavelength adjustment device and a main excitation pulse compression device; The main excitation pulse wavelength adjustment device is used to adjust the wavelength of the second main excitation pulse to obtain a first dispersed main excitation pulse; The main excitation pulse compression device is used to perform dispersion compensation and pulse compression on the first dispersed main excitation pulse to obtain the first main excitation pulse.

4. The combined stimulated Fourier transform coherent Raman spectroscopy detection system according to claim 3, characterized in that: The main excitation pulse wavelength adjustment device includes a first reflector, a second reflector, a third half-wave plate, a main excitation pulse spectrum topography device and a third reflector; The first reflector is used to reflect the second main excitation pulse to the second reflector; The second reflector is used to reflect the second main excitation pulse reflected by the first reflector to the third half-wave plate; The third half-wave plate is used to adjust the polarization direction of the second main excitation pulse reflected by the second reflector to obtain an adjusted main excitation pulse; The main excitation pulse spectrum broadening device is used to broaden the spectrum of the adjusted main excitation pulse to obtain the first dispersed main excitation pulse; The third reflecting mirror is used to reflect the first dispersed main excitation pulse to the main excitation pulse compression device.

5. The combined stimulated Fourier transform coherent Raman spectroscopy detection system according to claim 3, characterized in that: The main excitation pulse compression device includes a first dispersion prism, a second dispersion prism and a first corner mirror; The first dispersion prism and the second dispersion prism are used to perform dispersion compensation and pulse compression on the first dispersion main excitation pulse, and the first dispersion main excitation pulse passes through the first dispersion prism and the second dispersion prism respectively to obtain a second dispersion main excitation pulse; The first angle mirror is used to reflect and raise the second dispersion main excitation pulse, so that the second dispersion main excitation pulse passes through the second dispersion prism and the first dispersion prism respectively to obtain the first main excitation pulse.

6. The combined stimulated Fourier transform coherent Raman spectroscopy detection system according to claim 2, characterized in that: The supplementary excitation pulse adjustment device includes a fourth reflector, a fifth reflector, a fourth half-wave plate, a supplementary excitation pulse spectrum topography device and a first filter; The fourth reflecting mirror is used to reflect the second supplementary excitation pulse to the fifth reflecting mirror; The fifth reflecting mirror is used to reflect the second supplementary excitation pulse reflected by the fourth reflecting mirror to a fourth half-wave plate; The fourth half-wave plate is used to adjust the polarization direction of the second supplementary excitation pulse reflected by the fifth reflector to obtain a first adjusted supplementary excitation pulse; The supplementary excitation pulse spectrum broadening device is used to broaden the spectrum of the first adjusted supplementary excitation pulse to obtain the second adjusted supplementary excitation pulse, and obtain optical solitons in the preset long wavelength part of the second adjusted supplementary excitation pulse; The first optical filter is used to perform optical filtering on the second adjusted supplementary excitation pulse to filter out the non-soliton part to obtain the first supplementary excitation pulse.

7. The combined stimulated Fourier transform coherent Raman spectroscopy detection system according to claim 2, characterized in that: The optical splitter comprises a first half-wave plate, a first polarization beam splitter, a light block, a second half-wave plate and a second polarization beam splitter; The first half-wave plate is used to adjust the polarization direction of the original pulse to obtain a first adjusted pulse; The first polarization beam splitter is used to perform beam splitting processing on the first adjustment pulse to obtain a redundant pulse and a second adjustment pulse; The light block is used to block and absorb the redundant pulses; The second half-wave plate is used to adjust the polarization direction of the second adjustment pulse to obtain a third adjustment pulse; The second polarization beam splitter is used to perform beam splitting processing on the third adjustment pulse to obtain the second main excitation pulse and the second supplementary excitation pulse.

8. The combined stimulated Fourier transform coherent Raman spectroscopy detection system according to claim 1, characterized in that: The beam combining structure comprises: a time domain adjustment component, a focus adjustment component and a first dichroic mirror; The time domain adjustment component is used to perform time domain adjustment on the first main excitation pulse to obtain a main excitation pulse after time domain adjustment, so that the main excitation pulse after time domain adjustment overlaps with the first supplementary excitation pulse in the time domain at the sample to be tested; The focus adjustment component is used to adjust the focus position of the main excitation pulse after the time domain adjustment to obtain a third main excitation pulse, so that the third main excitation pulse and the first supplementary excitation pulse overlap in the focus space at the sample to be tested; The first dichroic mirror is used to perform beam combining processing on the third main excitation pulse and the first supplementary excitation pulse to obtain the first combined excitation pulse.

9. The combined stimulated Fourier transform coherent Raman spectroscopy detection system according to claim 1, characterized in that: The scanning structure includes a beam splitter, a first delay component, a second delay component and a delay detection component; The beam splitter is used to perform a replication process on the first joint excitation pulse to obtain a first replicated pulse and a second replicated pulse; The first delay component is used to perform reflection processing on the first replica pulse to obtain the second joint excitation pulse; The second delay component is used to perform reflection and delay scanning processing on the second replica pulse to obtain the third joint excitation pulse; The beam splitter is further used to perform beam combining processing on the second joint excitation pulse and the third joint excitation pulse, and emit the combined second joint excitation pulse and the third joint excitation pulse to the detection structure; The delay detection component is used to detect and monitor the relative delay between the second joint excitation pulse and the third joint excitation pulse.

10. The combined stimulated Fourier transform coherent Raman spectroscopy detection system according to claim 1, characterized in that: The detection structure includes an objective lens, a collecting lens and a detection assembly; The objective lens is used to inject and tightly focus the second joint excitation pulse and the third joint excitation pulse onto the sample to be tested, and jointly excite the sample to be tested to obtain a first signal light; The collecting mirror is used to collect the first signal light to obtain the second signal light; The detection component is used to determine the detection result of the joint stimulated Fourier transform coherent Raman spectroscopy of the sample to be tested according to the second signal light.

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