Joint stimulated fourier transform coherent raman spectroscopy detection system

Abstract

The application relates to a combined stimulated Fourier transform coherent Raman spectrum detection system. The system comprises a light source structure, a beam combination structure, a scanning structure and a detection structure; the light source structure is used for processing input original pulses to obtain a first main excitation pulse and a first supplementary excitation pulse; the beam combination structure is used for beam combination processing of 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 the second combined excitation pulse and the third combined excitation pulse are incident to the detection structure; and the detection structure is used for combined stimulated excitation of a sample to be detected and detection to obtain a detection result. The detection wave number range of the coherent Raman spectrum simultaneously includes a fingerprint region and a high wave number region.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of spectrum detection, in particular to a combined stimulated Fourier transform coherent Raman spectrum detection system. BACKGROUND

[0002] With the development of nonlinear spectrum technology and microscopy technology, Fourier transform coherent anti-Stokes Raman spectrum microscopy imaging technology appears, which is one of the mainstream technologies of broadband coherent Raman spectrum detection, and can detect the chemical specificity composition information of the sample to be measured.

[0003] In the conventional technology, a spectrum excitation scheme of impact stimulated or double-pulse stimulated is used.

[0004] However, the conventional spectrum excitation scheme has the problem of limited detectable wave number range of spectrum. SUMMARY

[0005] Therefore, it is necessary to provide a combined stimulated Fourier transform coherent Raman spectrum detection system which can make the coverage range of spectrum include the fingerprint region and the high wave number region.

[0006] In a first aspect, the present application provides a combined stimulated Fourier transform coherent Raman spectrum detection system, which comprises a light source structure, a beam combination structure, a scanning structure and a detection structure.

[0007] The light source structure is configured to process an 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 spectrum width is expanded to a preset value and is compressed to a transform limit, and the center wavelength of the first supplementary excitation pulse is separated from the center wavelength of the first main excitation pulse by a preset interval, and the first supplementary excitation pulse is an optical soliton.

[0008] The beam combination structure is configured to perform beam combination processing on the first main excitation pulse and the first supplementary excitation pulse to obtain a first combined excitation pulse.

[0009] The scanning structure is configured to scan the first combined excitation pulse to obtain a second combined excitation pulse and a third combined excitation pulse, and to make the second combined excitation pulse and the third combined excitation pulse incident to the detection structure.

[0010] The detection structure is configured to perform combined stimulated excitation on the sample to be measured and to detect the sample to obtain a detection result.

[0011] In one embodiment, the light source structure comprises a pulse generating device, a light splitting device, a main excitation pulse adjusting device and a supplementary excitation pulse adjusting device.

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

[0013] The splitting device is configured to split the original pulse to obtain a second main excitation pulse and a second supplementary excitation pulse;

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

[0015] The supplementary excitation pulse adjusting device is configured 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 adjusting device comprises a main excitation pulse wavelength adjusting device and a main excitation pulse compression device;

[0017] The main excitation pulse wavelength adjusting device is configured to adjust the wavelength of the second main excitation pulse to obtain a first dispersive main excitation pulse;

[0018] The main excitation pulse compression device is configured to compensate the dispersion and compress the pulse of the first dispersive main excitation pulse to obtain the first main excitation pulse.

[0019] In one of the embodiments, the main excitation pulse wavelength adjusting device comprises a first mirror, a second mirror, a third half-wave plate, a main excitation pulse spectrum widening device and a third mirror;

[0020] The first mirror is configured to reflect the second main excitation pulse to the second mirror;

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

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

[0023] The main excitation pulse spectrum widening device is configured to widen the spectrum of the adjusted main excitation pulse to obtain the first dispersive main excitation pulse;

[0024] The third mirror is configured to reflect the first dispersive main excitation pulse to the main excitation pulse compression device.

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

[0026] The first dispersion prism and the second dispersion prism are used for dispersion compensation and pulse compression of 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 for reflecting and lifting 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 of the embodiments, the supplementary excitation pulse adjusting device comprises a fourth mirror, a fifth mirror, a fourth half-wave plate, a supplementary excitation pulse spectrum widening device and a first filter;

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

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

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

[0032] The supplementary excitation pulse spectrum widening device is used for widening the spectrum of the first adjusted supplementary excitation pulse to obtain a second adjusted supplementary excitation pulse, and an optical soliton is obtained at a preset long wavelength part of the second adjusted supplementary excitation pulse;

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

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

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

[0036] The first polarization beam splitter is used for splitting processing of the first adjusted pulse to obtain a redundant pulse and a second adjusted pulse;

[0037] The optical block is used for blocking and absorbing the redundant pulse;

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

[0039] The second polarization beam splitter is configured to split 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 combination structure comprises a time domain adjustment component, a focal point adjustment component and a first dichroic mirror.

[0041] The time domain adjustment component is configured to adjust the time domain of the first main excitation pulse to obtain a time domain adjusted main excitation pulse, so that the time domain adjusted main excitation pulse and the first supplementary excitation pulse are time domain coincident at the sample to be measured.

[0042] The focal point adjustment component is configured to adjust the focal point position of the time domain adjusted main excitation pulse to obtain a third main excitation pulse, so that the third main excitation pulse and the first supplementary excitation pulse are focal point space coincident at the sample to be measured.

[0043] The first dichroic mirror is configured to combine the third main excitation pulse and the first supplementary excitation pulse to obtain the first joint excitation pulse.

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

[0045] The beam splitter is configured to copy the first joint excitation pulse to obtain a first copy pulse and a second copy pulse.

[0046] The first delay component is configured to reflect the first copy pulse to obtain the second joint excitation pulse.

[0047] The second delay component is configured to reflect and delay the second copy pulse to obtain the third joint excitation pulse.

[0048] The beam splitter is further configured to combine the second joint excitation pulse and the third joint excitation pulse, and to emit the combined second joint excitation pulse and the third joint excitation pulse to a detection structure.

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

[0050] In one of the embodiments, the detection structure comprises an objective lens, a collection lens and a detection component.

[0051] The objective lens is configured to emit and tightly focus the second joint excitation pulse and the third joint excitation pulse to the sample to be measured, and to jointly excite the sample to be measured to obtain a first signal light.

[0052] the collection mirror is configured to collect the first signal light to obtain second signal light;

[0053] the detection assembly is configured to determine a joint stimulated Fourier transform coherent Raman spectrum detection result of the sample to be measured according to the second signal light.

[0054] The joint stimulated Fourier transform coherent Raman spectrum detection system comprises a light source structure, a beam combination structure, a scanning structure, and a detection structure. The light source structure is configured to process an 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 with a spectral width expanded to a preset value and compressed to a transform limit, and the first supplementary excitation pulse has a central wavelength separated from a central wavelength of the first main excitation pulse by a preset interval and is an optical soliton. The beam combination structure is configured to perform beam combination processing on the first main excitation pulse and the first supplementary excitation pulse to obtain a first joint excitation pulse. The scanning structure is configured to scan the first joint excitation pulse to obtain a second joint excitation pulse and a third joint excitation pulse, and to cause the second joint excitation pulse and the third joint excitation pulse to be incident on the detection structure. The detection structure is configured to perform joint stimulated excitation on a sample to be measured and to perform detection to obtain a detection result. Because the light source structure can generate the first main excitation pulse with a wide spectrum transform limit and the first supplementary excitation pulse with a central wavelength separated from a central wavelength of the first main excitation pulse by a certain interval, the detection wave number range of the coherent Raman spectrum simultaneously includes a fingerprint region and a high wave number region. Compared with an existing spectral excitation scheme, the detection wave number range is no longer limited to the impact stimulated fingerprint region or the double-pulse stimulated flexible and narrow wave number region, thereby expanding the detection range of the sample to be measured. BRIEF DESCRIPTION OF DRAWINGS

[0055] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the related art, the following will briefly introduce the drawings needed to be used in the description of the embodiments of the present application or the related art. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0056] Figure 1 A frequency domain schematic diagram of a Fourier transform coherent anti-Stokes Raman spectrum detection system of a solid femtosecond pulse impact stimulated embodiment;

[0057] Figure 2 A frequency domain schematic diagram of a Fourier transform coherent anti-Stokes Raman spectrum detection system of a fiber femtosecond pulse impact stimulated embodiment after spectrum expansion;

[0058] Figure 3Frequency domain schematic diagram of a fiber-optic femtosecond pulse dual-pulse stimulated Fourier transform coherent anti-Stokes Raman spectroscopy system in one embodiment;

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

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

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

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

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

[0064] Figure 9 Frequency domain schematic diagram of a fiber-optic femtosecond pulse joint stimulated Fourier transform coherent anti-Stokes Raman spectroscopy system in one embodiment;

[0065] Figure 10 Time domain schematic diagram of a joint stimulated Fourier transform coherent Raman spectroscopy detection in one embodiment;

[0066] Figure 11 Time domain schematic diagram of a fiber-optic femtosecond pulse joint stimulated Fourier transform coherent anti-Stokes Raman spectroscopy system in one embodiment;

[0067] Reference signs:

[0068] Light source structure: 10; beam combination structure: 20; scanning structure 30:

[0069] Detection structure: 40; pulse generating device: 101; light splitting device: 102;

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

[0071] Main excitation pulse compression device: 104; supplementary excitation pulse adjusting device: 105;

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

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

[0074] First mirror: 131; second mirror: 132; third half-wave plate: 133;

[0075] Main excitation pulse spectrum spreading device: 134; third mirror: 135;

[0076] First dispersive prism: 141; second dispersive prism: 142;

[0077] First corner mirror: 143; fourth mirror: 151; fifth mirror: 152;

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

[0079] First filter: 155; time domain adjustment assembly: 201; focal point adjustment assembly: 202;

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

[0081] Eighth mirror: 223; beam splitter: 301; first delay assembly: 302;

[0082] Second delay assembly: 303; delay detection assembly: 304; tenth mirror: 331;

[0083] Curved mirror: 332; resonant scanning mirror: 333; helium-neon laser: 341;

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

[0085] First photodetector: 345; objective lens: 401; sample to be measured: 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 purposes, technical solutions and advantages of the present application clearer, the present application is further described in detail below in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the present application and do not limit the present application.

[0089] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this application; the use of the terms "including," "comprising," "having" and "with" in the specification and claims herein are used to mean "including but not limited to"; the use of the terms "first," "second," "third," etc. in the specification and claims herein is used for clarity only and does not necessarily indicate any relative importance or particular order.

[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 "a plurality of" is two or more, unless otherwise explicitly and specifically limited.

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

[0092] With the development of nonlinear spectral technology and microscopy technology, Fourier transform coherent anti-Stokes Raman spectroscopy microscopic imaging technology appears. This technology has the advantages of wideband spectrum detection, high spectral resolution (which 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 of coherent Raman spectrum detection. In the traditional technology, an impact stimulated spectrum excitation scheme or a double-pulse stimulated spectrum excitation scheme is usually used.

[0093] Among them, the impact stimulated spectrum excitation scheme requires very strict spectrum of the light source if a wide enough detection wave number range is to be achieved, because the maximum wave number that can be detected by the impact stimulated scheme depends on the spectral width of the transform-limited excitation pulse. Therefore, an ultra-wideband spectrum transform-limited excitation pulse is needed for impact stimulated excitation, and such a light source is usually extremely difficult to obtain. At present, domestic and foreign researchers use transform-limited pulses with a pulse width of about order to perform impact stimulated excitation, and the frequency domain schematic diagram thereof is as shown in Figure 1 The spectrum coverage range is concentrated in the fingerprint region (ω0) of low wave number , and it is difficult to excite the high wave number region (ω1) ) coherent Raman signals (a large number of Raman signals of biochemical substances exist in the fingerprint region and the high wave number region). Moreover, the solid-state femtosecond laser device is bulky and high in cost, which is not conducive to practical spectral detection application scenarios. In order to overcome the above difficulties, scholars at home and abroad use the method of optical fiber femtosecond pulse spectrum expansion to expand the spectrum of the excitation pulse while ensuring that it can be compressed to the transform limit, and to make the detection spectrum of the impact stimulated scheme cover the high wave number region, as shown in the frequency domain principle diagram Figure 2 However, due to the limitations of the spectrum expansion technology itself, in order to compress the pulse to the transform limit, the spectrum cannot be widened unlimitedly, otherwise the high-order dispersion will be quite significant. Therefore, 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 double-pulse stimulated spectral excitation scheme, the output of the laser is initially divided into two paths, one of which is adjusted in spectrum by introducing a spectrum expansion module so that the center wavelength is separated from the other path by a preset value, which is related to the detection wave number region to be excited and can be flexibly adjusted according to requirements. Finally, the two paths are combined as a double-pulse excitation light, as shown in the frequency domain principle diagram Figure 3 For example, as long as the center wavelength interval of the double pulse is set in the high wave number region, the corresponding coherent Raman signals in the high wave number region can be excited, solving the problem that the impact stimulated scheme cannot detect the high wave number region. However, the double-pulse stimulated scheme also has certain limitations. Although the detection wave number region is flexible and adjustable, the overall width of the detectable wave number is still limited due to the spectral width of each double pulse, and it is still difficult to detect the coherent Raman signals in the fingerprint region and the high wave number region at the same time.

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

[0096] In one embodiment, as shown in Figure 4 A joint stimulated Fourier transform coherent Raman spectrum detection system is provided, which 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 with a spectrum width expanded to a preset value and compressed to the transform limit, and the center wavelength of the first supplementary excitation pulse is separated from the center 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 combine 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 on the sample 402 to be detected and perform detection to obtain a detection result.

[0097] Wherein, the optical soliton is a pulse formed in the optical fiber due to the balance of chromatic effect and nonlinear effect, which can keep its shape, amplitude and speed unchanged when transmitting in the optical fiber, and is naturally a transform-limited pulse.

[0098] In the embodiment of the present application, the light source structure 10 can include a light source emitter and a light source processing device. The light source emitter is used to generate an original pulse and make the original pulse incident into the light source processing device. The light source processing device processes the input original pulse to obtain a first main excitation pulse and a first supplementary excitation pulse, and makes the first main excitation pulse and the first supplementary excitation pulse incident into the beam combination structure 20 respectively. Optionally, the light source processing device can perform processing such as 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 expanded to a preset value and is compressed to a transform-limited pulse, and the center wavelength of the first supplementary excitation pulse is separated from the center wavelength of the first main excitation pulse by a preset interval. Optionally, the preset interval can be set according to the high wave number of the actual demand excitation.

[0099] Optionally, the light source structure 10 can make the first main excitation pulse incident into the first receiving point of the beam combination structure 20 through the first incident channel, and make the first supplementary excitation pulse incident into the second receiving point of the beam combination 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 area is completed by the pump light and the Stokes light provided by the main excitation pulse, and the excitation of the high wave number area is completed by the pump light provided by the main excitation pulse and the Stokes light provided by the supplementary excitation pulse.

[0101] In the embodiment of the present application, the beam combination structure 20 adjusts the first main excitation pulse to obtain a third main excitation pulse, so that the third main excitation pulse and the first supplementary excitation pulse are matched in time domain and focal point at the sample to be measured 402, and the third main excitation pulse and the first supplementary excitation pulse are combined to obtain a first joint excitation pulse. Further, the first joint excitation pulse is incident into the scanning structure 30.

[0102] In the embodiment of the present application, the scanning structure 30 performs copying and time delay scanning on the first joint excitation pulse to obtain a second joint excitation pulse and a third joint excitation pulse with relative time delay, and monitors the relative time delay amount 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 into the detection structure 40.

[0103] In the embodiment of the present application, the probe structure 40 performs joint stimulated excitation on the sample 402 to be measured by the second joint excitation pulse and the third joint excitation pulse, so as to determine the probe result of the sample 402 to be measured. Optionally, the probe result of the sample 402 to be measured includes the Raman spectrum information of the biochemical substance to be measured.

[0104] The joint stimulated Fourier transform coherent Raman spectrum probe system includes a light source structure, a beam combination structure, a scanning structure and a probe structure. The light source structure is configured to process an 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 with a spectrum width expanded to a preset value and compressed to a transform limit, and the first supplementary excitation pulse has a center wavelength separated from the center wavelength of the first main excitation pulse by a preset interval and is an optical soliton. The beam combination structure is configured to perform beam combination processing on the first main excitation pulse and the first supplementary excitation pulse to obtain a first joint excitation pulse. The scanning structure is configured to scan the first joint excitation pulse to obtain a second joint excitation pulse and a third joint excitation pulse, and to make the second joint excitation pulse and the third joint excitation pulse incident on the probe structure. The probe structure is configured to perform joint stimulated excitation on a sample to be measured and to perform probe processing to obtain a probe result. Since the light source structure can generate the first main excitation pulse with a wide spectrum transform limit and the first supplementary excitation pulse with a center wavelength separated from the center wavelength of the first main excitation pulse by a certain interval, the probe wave number range of the coherent Raman spectrum includes the fingerprint region and the high wave number region at the same time. Compared with the existing spectrum excitation scheme, the probe wave number range is no longer limited to the impact stimulated fingerprint region or the double-pulse stimulated flexible and narrow wave number region, thereby expanding the probe range of the sample to be measured.

[0105] In one embodiment, as shown in FIG. 1, Figure 5 The light source structure 10 includes a pulse generating device 101, a splitting device 102, a main excitation pulse adjusting device 11 and a supplementary excitation pulse adjusting device 105. The pulse generating device 101 is configured to generate an original pulse. The splitting device 102 is configured 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 adjusting device 11 is configured to adjust the spectrum of the second main excitation pulse to obtain a first main excitation pulse. The supplementary excitation pulse adjusting device is configured 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, the pulse generating device 101 emits an original pulse to the splitting device 102, so that the splitting device 102 performs energy control and splitting processing on the original pulse, to obtain a second main excitation pulse and a second supplementary excitation pulse, and the splitting device 102 emits the second main excitation pulse to the main excitation pulse adjusting device 11, and emits the second supplementary excitation pulse to the supplementary excitation pulse adjusting device. The main excitation pulse adjusting device 11 contains a first photonic crystal fiber, and the nonlinear effect and the dispersion effect of the photonic crystal fiber are used to adjust the spectrum of the second main excitation pulse, to obtain a first main excitation pulse. The supplementary excitation pulse adjusting device 105 contains a second photonic crystal fiber, and the nonlinear effect and the dispersion effect of the photonic crystal fiber are used to perform wavelength adjustment on the second supplementary excitation pulse, to obtain a first supplementary excitation pulse. Optionally, the original pulse is a transform-limited femtosecond pulse, and the first main excitation pulse is a wider-band transform-limited femtosecond pulse, and the first supplementary excitation pulse is a transform-limited soliton femtosecond pulse with a longer wavelength.

[0107] In the above embodiment, the second main excitation pulse and the second supplementary excitation pulse are obtained by splitting processing on the original pulse, and then the second main excitation pulse and the second supplementary excitation pulse are processed to obtain a wider-band transform-limited femtosecond pulse and a transform-limited soliton femtosecond pulse with a longer wavelength, which improves the spectral width of the main excitation pulse and red-shifts the center wavelength of the supplementary excitation pulse to a preset value.

[0108] In one embodiment, as shown in FIG. 1, Figure 5 The main excitation pulse adjusting device 11 includes a main excitation pulse wavelength adjusting device 103 and a main excitation pulse compressor device 104. The main excitation pulse wavelength adjusting device 103 is used to perform wavelength adjustment on the second main excitation pulse to obtain a first dispersion main excitation pulse. The main excitation pulse compressor device 104 is used to perform dispersion compensation and pulse compression on the first dispersion main excitation pulse to obtain the first main excitation pulse.

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

[0110] In the above embodiment, the second main excitation pulse is sequentially subjected to wavelength adjustment, dispersion compensation and pulse compression, so that a wider-band transform-limited femtosecond pulse can be more accurately obtained.

[0111] In one embodiment, such as 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 dispersive main excitation pulse. The third reflector 135 is used to reflect the first dispersive main excitation pulse to the main excitation pulse compression device 104.

[0112] In this embodiment, the second main excitation pulse passes sequentially through a first reflecting mirror 131, a second reflecting mirror 132, a third half-wave plate 133, a main excitation pulse topology device 134, and a third reflecting mirror 135. After the beam splitter 102 incident the second main excitation pulse onto the first reflecting mirror 131, the first reflecting mirror 131 reflects the second main excitation pulse onto the second reflecting mirror 132. Further, the second reflecting mirror 132 reflects the second main excitation pulse onto the third half-wave plate 133, thereby adjusting the polarization direction of the second main excitation pulse by the third half-wave plate 133 to obtain an adjusted main excitation pulse that matches the principal axis direction of the first photonic crystal fiber in the main excitation pulse topology device 134. The main excitation pulse topology device 134 broadens the spectrum of the adjusted main excitation pulse to obtain a first dispersive main excitation pulse, and incident the first dispersive main excitation pulse onto the third reflecting mirror 135. Further, the third reflecting mirror 135 reflects the first dispersive main excitation pulse onto the main excitation pulse compression device 104.

[0113] In the above-mentioned embodiments, the first and second reflectors introduce four degrees of freedom to adjust the beam of the main excitation pulse, which facilitates the adjustment and alignment of the beam direction and landing point of the main excitation pulse. In addition, the main excitation pulse spectral expansion device is the first photonic crystal fiber, which broadens the spectrum of the first dispersive main excitation pulse to a preset value through nonlinear and dispersion effects.

[0114] In one embodiment, such as Figure 5As shown, the above-mentioned main excitation pulse compression device 104 comprises a first dispersion prism 141, a second dispersion prism 142 and a first corner mirror 143; the first dispersion prism 141 and the second dispersion prism 142 are used for dispersion compensation and pulse compression of the first dispersion main excitation pulse, after the first dispersion main excitation pulse passes through the first dispersion prism 141 and the second dispersion prism 142 respectively, a second dispersion main excitation pulse is obtained; the first corner mirror 143 is used for reflecting and lifting 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, and a first main excitation pulse is obtained.

[0115] In the embodiment of the present application, the first dispersion main excitation pulse is sequentially incident to the first dispersion prism 141 and the second dispersion prism 142, 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, after the first dispersion main excitation pulse passes through the first dispersion prism 141 and the second dispersion prism 142 respectively, a second dispersion main excitation pulse is obtained, the first corner mirror 143 reflects and lifts 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, and a first main excitation pulse is obtained. 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 of the height of the light beam, the first main excitation pulse will no longer act on the third reflector 135, and the first main excitation pulse is incident to the beam combination structure 20 immediately.

[0116] In the above-mentioned embodiment, the first dispersion prism and the second dispersion prism form a dispersion compensation prism pair, which can compensate the dispersion introduced by the first photonic crystal fiber to the first dispersion main excitation pulse through different refractive index responses of different frequencies of light to the material itself, the dispersion main excitation pulse passes through the dispersion compensation prism pair twice, and a first main excitation pulse is obtained, the pulse width is compressed to the transform limit, and the excitation efficiency of the Raman oscillation is ensured.

[0117] In one embodiment, as Figure 5As shown, the above-mentioned supplementary excitation pulse adjusting device 105 comprises a fourth mirror 151, a fifth mirror 152, a fourth half-wave plate 153, a supplementary excitation pulse spectrum widening device 154, and a first filter 155; the fourth mirror 151 is configured to reflect the second supplementary excitation pulse to the fifth mirror 152; the fifth mirror 152 is configured to reflect the second supplementary excitation pulse reflected by the fourth mirror 151 to the fourth half-wave plate 153; the fourth half-wave plate 153 is configured to adjust the polarization direction of the second supplementary excitation pulse reflected by the fifth mirror 152 to obtain a first adjusted supplementary excitation pulse; the supplementary excitation pulse spectrum widening device 154 is configured to widen the spectrum of the first adjusted supplementary excitation pulse to obtain a second adjusted supplementary excitation pulse, and obtain an optical soliton at a preset long-wavelength part of the second adjusted supplementary excitation pulse; and the first filter 155 is configured to optically filter the second adjusted supplementary excitation pulse to filter out a non-soliton part to obtain the first supplementary excitation pulse.

[0118] In the embodiment of the present application, the fourth mirror 151 reflects the second supplementary excitation pulse to the fifth mirror 152, so that the fifth mirror 152 reflects the second supplementary excitation pulse to the fourth half-wave plate 153, and further, the fourth half-wave plate 153 adjusts the polarization direction of the second supplementary excitation pulse to obtain the first adjusted supplementary excitation pulse, so as to match the principal axis direction of the second photonic crystal fiber in the supplementary excitation pulse spectrum widening device 154. Further, the supplementary excitation pulse spectrum widening device 154 widens the spectrum of the first adjusted supplementary excitation pulse to obtain the second adjusted supplementary excitation pulse, obtains the optical soliton at the preset long-wavelength part of the second adjusted supplementary excitation pulse, and makes the second adjusted supplementary excitation pulse incident to the first filter 155, so that the first filter 155 optically filters the second adjusted supplementary excitation pulse to filter out the non-soliton part to obtain the first supplementary excitation pulse, and makes the first supplementary excitation pulse incident to the beam combination structure 20.

[0119] In the above-mentioned embodiment, the fourth mirror and the fifth mirror introduce four adjusting degrees of freedom for 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 widening device is the second photonic crystal fiber, which widens the spectrum of the supplementary excitation pulse through the nonlinear effect and the dispersion effect, and obtains the optical soliton at the preset long-wavelength part.

[0120] In one embodiment, as Figure 5As shown, the above-mentioned light splitting device 102 comprises 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 adjusted pulse; the first polarization beam splitter 122 is used to split the first adjusted pulse to obtain a redundant pulse and a second adjusted 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 adjusted pulse to obtain a third adjusted pulse; and the second polarization beam splitter 125 is used to split the third adjusted pulse to obtain a second main excitation pulse and a second supplementary excitation pulse.

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

[0122] In the embodiment of the present application, the original pulse is incident into the first half-wave plate 121, the first half-wave plate 121 divides the original pulse into two light beams of orthogonal polarization directions, the two light beams propagate at different speeds inside the half-wave plate, and then are combined again to obtain a first adjusted pulse, and the first adjusted pulse is incident into the first polarization beam splitter 122, the first polarization beam splitter 122 splits the first adjusted pulse by using the polarization characteristics of light to obtain a redundant pulse and a second adjusted pulse, the redundant pulse is incident into the light block 123, the second adjusted pulse is incident into the second half-wave plate 124, the light block 123 blocks and absorbs the redundant pulse, the second half-wave plate 124 adjusts the polarization direction of the second adjusted pulse to obtain a third adjusted pulse, and the third adjusted pulse is incident into the second polarization beam splitter 125; further, the second polarization beam splitter 125 splits the third adjusted pulse to obtain a second main excitation pulse and a second supplementary excitation pulse.

[0123] In the above-mentioned embodiment, by using the combination of two groups of half-wave plates and polarization beam splitters, the absolute energy of the second main excitation pulse and the second supplementary excitation pulse is controlled respectively, so that the wavelength adjustment results of the main excitation pulse wavelength adjustment device and the supplementary excitation pulse wavelength adjustment device can be controlled.

[0124] In one embodiment, as Figure 6As shown in the figure, the above beam combining structure comprises: a time domain adjusting component 201, a focal point adjusting component 202 and a first dichroic mirror 203; the time domain adjusting component 201 is configured to perform time domain adjustment on the first main excitation pulse to obtain a time domain adjusted main excitation pulse, so that the time domain adjusted main excitation pulse is time domain coincident with the first supplementary excitation pulse at the sample to be measured 402; the focal point adjusting component 202 is configured to perform focal point position adjustment on the time domain adjusted main excitation pulse to obtain a third main excitation pulse, so that the third main excitation pulse is focal point space coincident with the first supplementary excitation pulse at the sample to be measured 402; and the first dichroic mirror 203 is configured 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 adjusting component 201 performs time domain adjustment on the first main excitation pulse to obtain a time domain adjusted main excitation pulse, so that the time domain adjusted main excitation pulse is time domain coincident with the first supplementary excitation pulse at the sample to be measured 402, and the time domain adjusted main excitation pulse is incident to the focal point adjusting component 202; the focal point adjusting component 202 performs focal point position adjustment on the time domain adjusted main excitation pulse to obtain a third main excitation pulse, so that the third main excitation pulse is focal point space coincident with the supplementary excitation pulse at the sample to be measured 402, and the third main excitation pulse is incident to the first dichroic mirror 203; and 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 to the scanning structure 30.

[0126] Optionally, as shown in the figure, the time domain adjusting component 201 comprises a sixth mirror, a second corner mirror and a seventh mirror; the sixth mirror is configured to reflect the first main excitation pulse to the second corner mirror; the second corner mirror is configured to reflect the first main excitation pulse reflected by the sixth mirror to the seventh mirror; and the seventh mirror is configured to reflect the first main excitation pulse reflected by the second corner mirror to the focal point adjusting component 202 to obtain the time domain adjusted main excitation pulse. By changing the front and back positions of the second corner mirror, the optical path of the main excitation pulse reflected by the sixth mirror in the second corner mirror can be changed. Figure 6 Optionally, the focal point adjusting component 202 comprises a first lens 221, a second lens 222 and an eighth mirror 223; the optical axes of the first lens 221 and the second lens 222 are located on the same straight line and coincide with the main excitation pulse beam, the first lens 221 and the second lens 222 adjust the focal point position of the main excitation pulse at the sample to be measured 402 to obtain the third main excitation pulse, and the third main excitation pulse is incident to the eighth mirror 223, which is configured to reflect the third main excitation pulse to the first dichroic mirror 203.

[0127]

[0128] ​In the above application examples, the first main excitation pulse is adjusted in time domain and focal point, so that the main excitation pulse after time domain adjustment is time domain coincident with the first supplementary excitation pulse at the sample to be detected, and is spatially coincident with the first supplementary excitation pulse at the sample to be detected, so as to ensure the effectiveness and accuracy of excitation of the sample to be detected.

[0129] In one embodiment, as shown in Figure 7 The scanning structure 30 comprises a beam splitter 301, a first time delay component 302, a second time delay component 303 and a time delay detection component 304. The beam splitter 301 is configured to copy the first joint excitation pulse to obtain a first copy pulse and a second copy pulse. The first time delay component 302 is configured to reflect the first copy pulse to obtain the second joint excitation pulse. The second time delay component 303 is configured to reflect and time delay scan the second copy pulse to obtain the third joint excitation pulse. The beam splitter 301 is further configured 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 time delay detection component 304 is configured to detect and monitor the relative time delay between the second joint excitation pulse and the third joint excitation pulse.

[0130] In the embodiment, the first joint excitation pulse is incident on the beam splitter 301. The beam splitter 301 copies the first joint excitation pulse to obtain the first copy pulse and the second copy pulse, and emits the first copy pulse to the first time delay component 302 and emits the second copy pulse to the second time delay component 303. The first time delay component 302 reflects the first copy pulse to obtain the second joint excitation pulse, and emits the second joint excitation pulse to the beam splitter 301. The second time delay component 303 reflects and time delay scans the second copy pulse to obtain the third joint excitation pulse, and emits the third joint excitation pulse to 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] Optionally, as shown in Figure 7 The second time delay component 303 comprises a tenth mirror 331, a curved mirror 332 and a resonant scanning mirror 333. The second copy pulse is reflected by the tenth mirror 331, the curved mirror 332, the resonant scanning mirror 333, the curved mirror 332 and the tenth mirror 331 in sequence to obtain the third joint excitation pulse and return to the beam splitter 301. The resonant scanning mirror 333 controls the relative time delay between the joint excitation pulses, which provides a prerequisite for Fourier transform detection.

[0132] Optionally, as shown in Figure 7As shown, the 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 configured to provide a stable single-frequency laser light source to obtain continuous laser light, and measure the relative delay between the second joint excitation pulse and the third joint excitation pulse by using the single-frequency laser interference principle; the second dichroic mirror 342 is configured to combine the first joint excitation pulse with the continuous laser light, and the continuous laser light will undergo the same beam splitting, copying, relative delay scanning and combining process as the first joint excitation pulse, so that the combined first delay continuous laser light and the second delay continuous laser light are finally obtained after the combiner; the relative delay between the first delay continuous laser light and the second delay continuous laser light is always consistent with the relative delay between the second joint excitation pulse and the third joint excitation pulse; the third dichroic mirror 343 is configured to separate the second and third joint excitation pulses and the first and second delay continuous laser lights; the third lens 344 is configured to focus the combined continuous laser light on the detection target surface of the first photodetector 345; and the first photodetector 345 is configured to detect the interference signal intensity of the first delay continuous laser light and the second delay continuous laser light to analyze the relative delay amount, so that the correct joint excitation pulse relative delay information provides a guarantee for the accuracy of the Fourier transform spectrum detection.

[0133] In the above application embodiment, the first joint excitation pulse is copied, reflected and delay 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 the spectrum detection.

[0134] In one embodiment, as shown in Figure 8 The above detection structure 40 includes an objective lens 401, a collection lens 403 and a detection component 404; the objective lens 401 is configured to make the second joint excitation pulse and the third joint excitation pulse incident and tightly focus on the sample to be measured 402, and excite the sample to be measured 402 by joint stimulated emission to obtain the first signal light; the collection lens 403 is configured to collect the first signal light to obtain the second signal light; and the detection component 404 is configured to determine the coherent Raman spectrum detection result of the sample to be measured 402 according to the second signal light.

[0135] The sample to be measured 402 is a sample to be measured for coherent Raman spectrum.

[0136] In the embodiment of the present application, the sample 402 to be measured is arranged between the objective lens 401 and the collecting lens 403, the combined second excitation pulse and the third excitation pulse are collected and focused by the objective lens 401, so that the sample 402 to be measured is jointly excited, and the first signal light is obtained, the collecting lens 403 collects the first signal light generated by the sample 402 to be measured, and the second signal light is obtained, and the second signal light is incident on the detection assembly 404; the detection assembly 404 determines the coherent Raman spectrum detection result of the sample 402 to be measured according to the second signal light.

[0137] Optionally, as shown in Figure 8 , the detection assembly 404 comprises a second filter 441, a fourth lens 442 and a second photodetector 443; the second filter 441 is used for performing optical filtering processing on the second signal light, filtering out the residual second excitation pulse and the third excitation pulse, and obtaining the third signal light; the fourth lens 442 is used for focusing the third signal light on the detection target surface of the second photodetector 443; and the second photodetector 443 is used for performing detection processing according to the third signal light, and determining the coherent Raman spectrum detection result of the sample 402 to be measured. The third signal light is the short-wave anti-Stokes scattering after the second filter 441 performs the long-wave filtering processing.

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

[0139] In the embodiment of the present application, the frequency domain schematic diagram of the embodiment of the present application is as shown in Figure 9 , the excitation light of the system is obtained by the same optical fiber femtosecond pulse through two different spectrum expanding modules, respectively, to generate the main excitation pulse and the supplementary excitation pulse, and the combined excitation pulse is combined to be incident on the sample 402 to be measured. The main excitation pulse has a relatively wide spectrum and is compressed to the transform limit, and can excite the Raman oscillation in the fingerprint region; the supplementary excitation pulse is a relatively narrow optical soliton, which can cooperate with the main excitation pulse to excite the Raman oscillation in the high-wave number region. As shown in Figure 10 , if the angular frequency of the Raman oscillation is , after the single combined excitation pulse is incident on the sample 402 to be measured, the Raman oscillation of the sample molecule is excited, and at the same time, the main excitation pulse acts on the Raman oscillation of the molecule as the detection light to generate the coherent anti-Stokes signal. The time domain principle of the joint stimulated Fourier transform coherent Raman spectrum detection system is as shown in Figure 11 , through copying and delaying, the second excitation pulse and the third excitation pulse after the delay are incident on the sample 402 to be measured in turn, and the Raman oscillations and , are excited, respectively. Excitation by the third combined excitation pulse Interference then occurs, and the Raman oscillations of the molecules are... The process will continue in the form of... The constructive or destructive interference depends on the relative delay between the second and third joint excitation pulses. And obtain a coherent anti-Stokes signal of corresponding strength. By scanning the relative delay This yields the time-domain interferogram of the coherent anti-Stokes signal, such as... Figure 11 As shown in (c), the coherent anti-Stokes Raman spectrum of the sample 402 can be obtained by performing a Fourier transform on the time-domain interferogram.

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

[0141] The technical features of the above embodiments can be combined in any way. For the sake of brevity, 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 embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. A combined stimulated Fourier transform coherent Raman spectroscopy detection system, characterized in that, The 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 raw 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 the transformation limit, the center wavelength of the first supplementary excitation pulse is separated from the center wavelength of the first main excitation pulse by a preset distance, and the first supplementary excitation pulse is an optical soliton. The beam combining structure is used to combine 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 incident the second joint excitation pulse and the third joint excitation pulse onto the detection structure; The detection structure is used to perform combined stimulated excitation and detection on the sample to be tested, and 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 beam splitting device, a main excitation pulse adjusting device, and a supplementary excitation pulse adjusting device; The pulse generating device is used to generate the original pulse; The beam splitter is used to split 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 the first dispersive main excitation pulse; The main excitation pulse compression device is used to perform dispersion compensation and pulse compression on the first dispersive 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 topology 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 mirror to obtain an adjusted main excitation pulse; The main excitation pulse spectral expansion device is used to broaden the spectrum of the adjusted main excitation pulse to obtain the first dispersive main excitation pulse; The third mirror is used to reflect the first dispersive master excitation pulse to the master 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 dispersive prism, a second dispersive prism, and a first corner mirror; The first dispersive prism and the second dispersive prism are used to perform dispersion compensation and pulse compression on the first dispersive master excitation pulse. After the first dispersive master excitation pulse passes through the first dispersive prism and the second dispersive prism respectively, the second dispersive master excitation pulse is obtained. The first corner mirror is used to reflect and elevate the second dispersive master excitation pulse, so that the second dispersive master excitation pulse passes through the second dispersive prism and the first dispersive prism respectively to obtain the first master 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 mirror, a fifth mirror, a fourth half-wave plate, a supplementary excitation pulse topology device, and a first filter; The fourth reflector is used to reflect the second supplementary excitation pulse to the fifth reflector; The fifth reflecting mirror is used to reflect the second supplementary excitation pulse reflected by the fourth reflecting mirror to the 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 the first adjusted supplementary excitation pulse; The supplementary excitation pulse spectral expansion device is used to broaden the spectrum of the first adjusted supplementary excitation pulse to obtain a second adjusted supplementary excitation pulse, and to obtain an optical soliton in the preset long wavelength portion of the second adjusted supplementary excitation pulse; The first filter is used to optically filter the second adjustment and supplementary excitation pulse to filter out the non-soliton portion and 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 beam splitter includes a first half-wave plate, a first polarizing beam splitter, an optical block, a second half-wave plate, and a second polarizing 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 split 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 the third adjustment pulse; The second polarization beam splitter is used to split 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 includes: a time-domain adjustment component, a focus adjustment component, and a first dichroic mirror; The time-domain adjustment component is used to adjust the first main excitation pulse in the time domain to obtain a time-domain adjusted main excitation pulse, so that the time-domain adjusted main excitation pulse and the first supplementary excitation pulse coincide in the time domain at the sample to be tested. The focus adjustment component is used to adjust the focus position of the time-domain adjusted main excitation pulse to obtain a third main excitation pulse, so that the third main excitation pulse and the first supplementary excitation pulse coincide in the focus space at the sample to be tested. The first dichroic mirror is used to combine 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 replicate the first joint excitation pulse to obtain a first replicated pulse and a second replicated pulse. The first delay component is used to reflect the first replicated pulse to obtain the second joint excitation pulse; The second delay component is used to perform reflection and delay scanning processing on the second replicated pulse to obtain the third joint excitation pulse; The beam splitter is also used to combine the second joint excitation pulse and the third joint excitation pulse, and to 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 incident and focus the second and third joint excitation pulses onto the sample under test, thereby jointly exciting the sample under test 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 joint stimulated Fourier transform coherent Raman spectroscopy detection result of the sample under test based on the second signal light.

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