A method for regulating mid-infrared light field and a light guiding and intensity confinement heterostructure

Abstract

The present invention discloses a method for mid-infrared light field regulation and a light guiding and intensity confinement heterostructure. The method for mid-infrared light field regulation includes: inputting the light sources generated by a pump source and a weak probe seed into the light guiding and intensity confinement heterostructure, which includes a silicon nitride core diameter, a silica substrate, and a cladding, and there is a strong confinement effect between the silicon nitride core diameter and the silica substrate, and between the silica substrate and the cladding; when the light source is processed by the light guiding and intensity confinement heterostructure, the light guiding and intensity confinement heterostructure outputs a single-mode waveguide laser with high spatial coherence. The present invention uses a femtosecond pump field and a tunable weak probe light as light sources, and realizes the regulation of the effective wavelength near 3.5 μm through nonlinear interaction, obtaining a single-mode waveguide laser output with high spatial coherence, and solving the problem of mid-infrared light field regulation of on-chip light sources.

Description

Technical Field

[0001] The present invention relates to the technical field of optical wavelength conversion, and in particular to a mid-infrared light field control method, system, mobile terminal and computer-readable storage medium. Background Art

[0002] Mid-infrared light generation is a research hotspot in the field of wavelength conversion. Direct methods for mid-infrared light generation are widely used in spectroscopy, detection systems, optical sensing, biophotonics, and other fields, especially in the functional group region within the range of 3-5μm. However, there are currently many methods for directly generating mid-infrared light, such as interband cascade lasers, quantum cascade lasers, and Fe2+-doped crystals, but they all have the characteristics of complex structure and poor tunability. In addition, supercontinuum generation in photon integrated waveguides can achieve mid-infrared light generation, but supercontinuum generation has the characteristics of compact single-pass structure, no need for time synchronization, and wide tunability range, which can achieve broadband mid-infrared light generation. However, supercontinuum light generation is the result of a combination of multiple effects, with poor target controllability, and the spectrum reachable range and conversion efficiency still cannot meet the needs of practical applications.

[0003] Therefore, the prior art still needs to be improved and developed. Summary of the invention

[0004] The main purpose of the present invention is to provide a mid-infrared light field control method, system, mobile terminal and computer-readable storage medium, aiming to solve the problem that the target controllable performance is poor when generating mid-infrared light in the prior art, and the spectrum reachable range and conversion efficiency still cannot meet the needs of practical applications.

[0005] To achieve the above object, the present invention provides a mid-infrared light field control method, the mid-infrared light field control method comprising the following steps:

[0006] Inputting the light source generated by the pump source and the weak detection seed into a light-guiding strong confinement heterostructure, wherein the light-guiding strong confinement heterostructure comprises a silicon nitride core, a silicon dioxide substrate and a cladding, and there is a strong confinement effect between the silicon nitride core and the silicon dioxide substrate, and between the silicon dioxide substrate and the cladding;

[0007] When the light source is processed by the light-guiding strong confinement heterostructure, the light-guiding strong confinement heterostructure outputs a single-mode waveguide laser with high spatial coherence.

[0008] In the mid-infrared light field control method, the input end of the light-guiding strong-constrained heterostructure is connected to the pump source and the weak detection seed, and the weak detection seed is a weak detection wave used to provide seeds for mid-infrared light field control.

[0009] The mid-infrared light field control method, wherein the mid-infrared light field control method further comprises:

[0010] The wavelength of the weak detection seed is adjusted to generate specific mid-infrared laser radiation, and an adjustable lasing wavelength is output after passing through the light-guiding strong confinement heterostructure.

[0011] The mid-infrared light field control method, wherein after the light source is processed by the light-guiding intensity-constrained heterostructure, the light-guiding intensity-constrained heterostructure outputs a single-mode waveguide laser with high spatial coherence, specifically includes:

[0012] The light source generated by the pump source and the weak detection seed includes a strong pump wave, a first weak detection wave and a second weak detection wave, wherein the strong pump wave is a soliton that maintains a transmission shape and is distributed in an anomalous dispersion region, and the first weak detection wave and the second weak detection wave are distributed around the strong pump wave;

[0013] The first weak detection wave and the strong pump wave interact nonlinearly to excite resonant radiation exceeding the wavelength of conventional dispersive radiation, and the second weak detection wave and the strong pump wave interact nonlinearly through collision to excite resonant radiation below the wavelength of conventional dispersive radiation, thereby obtaining a highly coherent mid-infrared resonant radiation sideband centered on the wavelength of conventional dispersive radiation.

[0014] In the mid-infrared light field control method, the transmission characteristics of the light-guiding strong-constrained heterostructure include the dispersion characteristics and high nonlinear effects of the medium.

[0015] In the mid-infrared light field control method, the incident center wavelength of the pump source is 1550nm and the bandwidth is 10nm.

[0016] The mid-infrared light field control method, wherein the mid-infrared light field control method further comprises:

[0017] The weak probe light pulse achieves wavelength conversion near 3.5μm through nonlinear interaction.

[0018] The mid-infrared light field control method, wherein the light-guiding strong constrained heterostructure achieves phase matching near a wavelength of 3.5 μm in the mid-infrared region to obtain an interaction phase matching point near a wavelength of 3.5 μm.

[0019] In addition, to achieve the above-mentioned purpose, the present invention also provides a light-guiding strong confinement heterostructure, characterized in that the light-guiding strong confinement heterostructure comprises a silicon nitride core, a silicon dioxide substrate and a cladding;

[0020] There is a strong confinement effect between the silicon nitride core and the silicon dioxide substrate, and between the silicon dioxide substrate and the cladding.

[0021] The described light-guiding strong-constraint heterostructure, in which the core diameter width of silicon nitride is 0.87 μm, the height is 1.7 μm, and the length is 10 mm.

[0022] In the present invention, the light sources generated by the pump source and the weak detection seed are input into the light-guiding strong-constraint heterostructure. The light-guiding strong-constraint heterostructure includes a silicon nitride core diameter, a silica substrate, and a cladding. There is a strong constraint effect between the silicon nitride core diameter and the silica substrate, and between the silica substrate and the cladding. When the light source is processed by the light-guiding strong-constraint heterostructure, the light-guiding strong-constraint heterostructure outputs a single-mode waveguide laser with high spatial coherence. The present invention uses a femtosecond pump field and an adjustable weak detection light as the light source, and realizes the effective wavelength regulation near 3.5 μm through nonlinear interaction, obtaining a single-mode waveguide laser output with high spatial coherence, and solving the problem of mid-infrared light field regulation in on-chip light sources. Description of the Drawings

[0023] Figure 1 is a flowchart of a preferred embodiment of the mid-infrared light field regulation method of the present invention;

[0024] Figure 2 is a dispersion schematic diagram of the waveguide of the light-guiding strong-constraint heterostructure in a preferred embodiment of the mid-infrared light field regulation method of the present invention;

[0025] Figure 3 is a schematic diagram of the single-mode spot structure in the light-guiding strong-constraint heterostructure of the present invention;

[0026] Figure 4 is a schematic diagram of realizing mid-infrared wavelength conversion by the pump-probe structure in a preferred embodiment of the mid-infrared light field regulation method of the present invention;

[0027] Figure 5 is a spectrogram of the mid-infrared dispersion wave realized by the silicon nitride waveguide in a preferred embodiment of the mid-infrared light field regulation method of the present invention;

[0028] Figure 6 is the spectrogram of the wavelength conversion in the kinetic process of implementing pump-probe wave collision and nonlinear interaction in a preferred embodiment of the mid-infrared light field regulation method of the present invention;

[0029] Figure 7 is a schematic diagram of the comparison between the theoretical result and the test result in the kinetic process of implementing pump-probe wave collision and nonlinear interaction in a preferred embodiment of the mid-infrared light field regulation method of the present invention;

[0030] Figure 8 is the spectrogram of the wavelength conversion effect in the implementation of phase-sensitive scattering four-wave mixing in a preferred embodiment of the mid-infrared light field regulation method of the present invention. Detailed Embodiments

[0031] In order to make the purpose, technical solution and advantages of the present invention clearer and more specific, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0032] Pump-probe collision interaction and phase-sensitive scattering four-wave mixing are important wavelength conversion technologies. They use readily available fiber lasers to directly generate mid-infrared light. They have absolute advantages such as simplicity and robustness and can be used in nonlinear optics, optical communications, and sensing. At the same time, the nonlinear wavelength-tuned laser output has good directionality, high brightness, and high coherence, making these technologies suitable for compact, chip-integrated spectroscopy and sensing applications.

[0033] The mid-infrared light field control method described in the preferred embodiment of the present invention is as follows: Figure 1 As shown, the mid-infrared light field control method includes the following steps:

[0034] Step S10, inputting the light source generated by the pump source and the weak detection seed into the light-guiding strong confinement heterostructure, wherein the light-guiding strong confinement heterostructure comprises a silicon nitride core, a silicon dioxide substrate and a cladding, and there is a strong confinement effect between the silicon nitride core and the silicon dioxide substrate, and between the silicon dioxide substrate and the cladding;

[0035] Step S20: After the light source is processed by the light-guiding intensity-confined heterostructure, the light-guiding intensity-confined heterostructure outputs a single-mode waveguide laser with high spatial coherence.

[0036] Specifically, Figure 3 As shown, the light-guiding strong confinement heterostructure includes silicon nitride (Si 3 N 4) core diameter, silica substrate and cladding, small size and simple structure; there is a strong confinement effect between the silicon nitride core diameter and the silica substrate, and between the silica substrate and the cladding, which is used to effectively excite the transverse fundamental mode (the transmission of light in the medium has a three-dimensional structure, namely the transverse spatial dimension and the time dimension. The transverse fundamental mode refers to the spatial transmission characteristics that keep the basic mode structure unchanged, which is equivalent to mathematically, the space remains unchanged and only the time dimension is considered) to obtain a single-mode waveguide laser output with high spatial coherence; the guide The silicon nitride core diameter in the intensity-constrained heterostructure is 0.87 μm wide, 1.7 μm high and 10 mm long. The combination of its core diameter and cladding size provides a favorable environment for mid-infrared light field regulation. The advantage of designing this structure is that the light beam maintains fundamental mode transmission in the light-guiding intensity-constrained heterostructure (waveguide) to ensure the spatial coherence of the light while the corresponding mode area is small, thereby achieving highly nonlinear transmission of the pulse. At the same time, the waveguide geometry makes the dispersion zero point experienced by the pulse go deeper into the mid-infrared region, providing a favorable basis for mid-infrared light field regulation.

[0037] The input end of the light-guiding strong confinement heterostructure is connected to the pump source (the pump source is used to excite the laser working material and pump the activated particles from the ground state to the high energy level to achieve particle number inversion) and the weak detection seed. The weak detection seed is a weak detection wave (weak linear wave) and is used to provide a seed for mid-infrared light field regulation. The waveguide environment (i.e., the light-guiding strong confinement heterostructure) provides nonlinear interaction. The present invention can generate a specific mid-infrared laser radiation output by adjusting the wavelength of the weak detection seed, so that the waveguide pump-detection laser structure has a flexible and adjustable lasing wavelength to eliminate the influence of ambient light background noise on imaging.

[0038] The pump source is a strong pump source, the incident center wavelength of the strong pump source is 1550nm, and the bandwidth is 10nm.

[0039] like Figure 2 As shown, a schematic diagram of the dispersion of the light-guiding strong confinement heterostructure waveguide, including the transmission characteristics and geometric size structure of the light-guiding strong confinement heterostructure, wherein the light-guiding strong confinement heterostructure is composed of a silicon nitride core, a silicon dioxide substrate and a cladding; Figure 2 The meaning of β is the dispersion characteristics of silicon nitride heterostructure (linear effect experienced by pulses during transmission in the medium). During pulse transmission, two phase matching points of the four-wave mixing process can be realized due to the medium characteristics, where PM1 and PM2 refer to phase matching points 1 and 2 respectively. The transmission characteristics of the light-guiding strong constraint heterostructure mainly include the dispersion characteristics and high nonlinear effects of the medium. These two characteristics provide the basis for mid-infrared light field regulation. The dispersion characteristics of the medium include two zero dispersion points. Figure 2The two zero dispersion points in are marked ZDW1 (zeros-dispersion wavelength) and ZDW2, ZDW1 represents the first zero dispersion point, ZDW2 represents the second zero dispersion point, the shaded area between the two points is the anomalous dispersion area (negative dispersion), and the other areas are the normal dispersion area (positive dispersion), the second zero dispersion point ZDW2 extends to around 2.28μm, so that the second phase matching point PM2 (PM1 is the first phase matching point) advances (deepens) to around 3.5μm in the mid-infrared region. Figure 4 As shown in the figure, including the femtosecond pump source and the weak detection wave and the corresponding wavelength conversion direction, the wavelength conversion in the corresponding area is realized through the specific transmission characteristics provided by the transmission waveguide medium and the efficient nonlinear interaction (for example, the weak detection light pulse realizes the wavelength conversion near 3.5μm through nonlinear interaction); and the high nonlinear effect is due to the single-mode spot mode area ( Figure 3 ) combined with the nonlinear coefficient.

[0040] In the present invention, the input end of the light-guiding strong-constrained heterostructure (i.e., the light-guiding strong-constrained waveguide structure) is connected to a femtosecond pump and a detection wave seed, and a high nonlinear effect is provided by the high contrast of the core diameter-cladding refractive index in the light-guiding strong-constrained heterostructure environment. The light-guiding strong-constrained heterostructure provides a zero dispersion point deep into the mid-infrared. A pump-detection structure is formed by adopting a femtosecond pump and a weak linear wave seed, and the problem of regulating the infrared light field of the on-chip light source is solved through effective nonlinear interaction.

[0041] The light-guiding strong confinement heterostructure adjusts the core diameter and cladding geometry to further guide the laser to the fundamental mode bound spot to provide a high nonlinear coefficient, and by applying stress to the core diameter and cladding geometry, the second zero dispersion point is extended deep into the mid-infrared to obtain an interaction phase matching point near the wavelength of 3.5μm.

[0042] like Figure 4 As shown, Figure 4The diagram is a wavelength conversion diagram of a strong pump-weak probe structure, including a strong pump wave, a first weak probe wave (weak probe wave 1) and a second weak probe wave (weak probe wave 2), wherein the strong pump wave is a soliton that maintains its shape and is distributed in the anomalous dispersion region, and two weak probe waves are distributed around the strong pump wave. The first weak probe wave (weak probe wave 1) interacts nonlinearly with the strong pump wave to excite resonant radiation exceeding the wavelength of conventional dispersive radiation, and the second weak probe wave (weak probe wave 2) collides with the strong pump wave and interacts nonlinearly to excite resonant radiation below the wavelength of conventional dispersive radiation. With the wavelength of conventional dispersive radiation as the center, a highly coherent mid-infrared resonant radiation sideband is obtained. Phase-matched dispersive radiation is a dispersive wave released when the pump wave is transmitted under the influence of the transmission characteristics of the medium, and its wavelength position can be determined by phase matching. The dynamics of the collision and nonlinear interaction of the pump-probe wave is that the pump and the probe wave with different transmission speeds collide at a certain distance and interact with each other, and a new light wave is transmitted at the same time, and its wavelength position is located on the left side of the phase-matched dispersive radiation.

[0043] In the light-guiding strong confinement heterostructure, a strong pump light pulse realizes traditional dispersive wave radiation output through phase matching, and this wavelength position provides a conversion center for the wavelength conversion scheme of pump-probe.

[0044] The pump-probe wavelength conversion scheme can be any one of traditional dispersive wave radiation output, optical horizon wavelength conversion and phase-sensitive scattering four-wave mixing. By combining a specific waveguide geometry structure, the bandwidth characteristics of the lasing transmission laser can be adjusted.

[0045] The light-guiding intensity-constrained heterostructure photolithographically adjusts the geometric structure of the waveguide, and by applying stress to the silicon nitride structure, regulates the waveguide transmission characteristics (such as dispersion characteristics and fundamental mode area) to further optimize the transmission characteristics of the laser in the heterostructure.

[0046] like Figure 5 As shown, Figure 5 It is a schematic diagram of the traditional dispersive radiation generated by strong pumping in a light-guiding strong-confinement heterostructure and its phase matching relationship, including the input pump field, the geometric dispersion of the silicon nitride heterostructure waveguide, the spectral profile formed by the dispersive wave radiation during transmission, and the waveguide output spectral profile. The strongly coupled heterostructure confines the light to a low-order mode, excites a single transverse mode, and regulates the spatial coherence of the light field laser to obtain a laser spectral output with high spatial coherence.

[0047] in, Figure 5The two curves below (with distance information marked) are the output spectra at different distances after the pump wave transmission is affected by the medium characteristics, and the upper part is the phase matching curve. BS-DW (Blue-shifted dispersive wave) and RS-DW (Red-shifted dispersive wave) represent the blue-shifted and red-shifted dispersive waves, respectively. They are new light waves formed by the energy transfer caused by the pump being affected by the transmission medium.

[0048] Figure 6 and Figure 7 The wavelength conversion spectrum diagram shown in the example of the optical horizon dynamics process of the present invention has a high spectral density; Figure 6 It is the output spectrum curve corresponding to the two detection wavelengths for the pump-probe wave collision dynamics. Figure 7 It is a comparison of the theoretical result curve and the test results of pump-probe waves (various wavelengths) for the collision dynamics of pump-probe waves; adjusting the probe wavelength can achieve effective tuning of the new wave sidebands in the mid-infrared [2.8μm, 3.6μm] range.

[0049] Figure 8 The figure shows the wavelength conversion effect spectrum diagram in the phase-sensitive scattering four-wave mixing example of the present invention. For the phase-sensitive scattering four-wave mixing process, the theoretical result curve is compared with the test results of the pump-probe wave (multiple different wavelengths); regulating the detection wavelength in the range of [1μm, 1.5μm] can achieve effective tuning of the new frequency optical sidebands in the mid-infrared range of [3.6μm, 4μm].

[0050] Furthermore, the present invention also provides a light-guiding strong confinement heterostructure, wherein the light-guiding strong confinement heterostructure comprises a silicon nitride core, a silicon dioxide substrate and a cladding; a strong confinement effect exists between the silicon nitride core and the silicon dioxide substrate, and between the silicon dioxide substrate and the cladding.

[0051] The silicon nitride core in the light-guiding strong confinement heterostructure has a width of 0.87 μm, a height of 1.7 μm and a length of 10 mm.

[0052] In summary, by adopting the above technical solution, the beneficial effects of the present invention are:

[0053] (1) In the present invention, the light-guiding strong confinement heterostructure includes a silicon nitride core, a silicon dioxide substrate and a cladding. There is a strong confinement effect between the silicon nitride core and the silicon dioxide substrate, and between the silicon nitride core and the cladding, which is used to effectively excite multiple transverse fundamental modes and obtain a single-mode waveguide laser output with high spatial coherence.

[0054] (2) In the present invention, a laser spectrum structure with high coherence is formed by combining single-mode laser output with a strongly coupled heterogeneous waveguide structure, thereby providing an ideal laser transmission system for compact and efficient wavelength conversion technology.

[0055] (3) In the present invention, the high contrast of the core-cladding refractive index of the light-guiding strong confinement heterostructure further constrains the laser spectrum into a transverse fundamental mode, excites a single transverse mode to provide a high nonlinear effect, and regulates the waveguide dispersion of the single-mode laser by applying stress to the waveguide core-cladding geometric structure to obtain a second zero dispersion point deep into the mid-infrared.

[0056] (4) In the present invention, by selecting the wavelength of the pump source, the laser dispersion wave spectrum has the characteristic of tunable lasing bandwidth.

[0057] (5) In the present invention, by selecting a detection wavelength higher than the pump source wavelength, the pump-probe structure can obtain a flexibly adjustable lasing wavelength through optical horizon dynamics (dynamics of nonlinear interaction caused by collision of pump-probe waves).

[0058] (6) In the present invention, by selecting a detection wavelength lower than the pump source wavelength, the pump-probe structure obtains lasing radiation with a wavelength exceeding the dispersion wave through phase-sensitive scattering dynamics.

[0059] In summary, the present invention provides a mid-infrared light field control method and a light-guiding strong-constraint heterostructure, the mid-infrared light field control method comprising: inputting a light source generated by a pump source and a weak detection seed into a light-guiding strong-constraint heterostructure, the light-guiding strong-constraint heterostructure comprising a silicon nitride core, a silicon dioxide substrate and a cladding, and there is a strong confinement effect between the silicon nitride core and the silicon dioxide substrate, and between the silicon dioxide substrate and the cladding; when the light source is processed by the light-guiding strong-constraint heterostructure, the light-guiding strong-constraint heterostructure outputs a single-mode waveguide laser with high spatial coherence. The present invention uses a femtosecond pump field and an adjustable weak detection light as light sources, realizes effective wavelength control near 3.5μm through nonlinear interaction, obtains single-mode waveguide laser output with high spatial coherence, and solves the problem of on-chip light source mid-infrared light field control.

[0060] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0061] It should be understood that the application of the present invention is not limited to the above examples. For ordinary technicians in this field, improvements or changes can be made based on the above description. All these improvements and changes should fall within the scope of protection of the claims attached to the present invention.

Claims

1. A method for regulating mid-infrared light field, characterized in that, the method for regulating mid-infrared light field includes: Inputting the light sources generated by a pump source and a weak probe seed into a light guiding and intensity confinement heterostructure, the light guiding and intensity confinement heterostructure includes a silicon nitride core diameter, a silica substrate and a cladding, and there is a strong confinement effect between the silicon nitride core diameter and the silica substrate, and between the silica substrate and the cladding; When the light source is processed by the light guiding and intensity confinement heterostructure, the light guiding and intensity confinement heterostructure outputs a single-mode waveguide laser with high spatial coherence; When the light source is processed by the light guiding and intensity confinement heterostructure, the light guiding and intensity confinement heterostructure outputs a single-mode waveguide laser with high spatial coherence, specifically including: The light sources generated by the pump source and the weak probe seed include a strong pump wave, a first weak probe wave and a second weak probe wave. The strong pump wave is a soliton that maintains its shape during transmission and is distributed in the anomalous dispersion region, and the first weak probe wave and the second weak probe wave are distributed around the strong pump wave; The first weak probe wave and the strong pump wave interact nonlinearly to excite resonance radiation exceeding the traditional dispersion radiation wavelength, and the second weak probe wave and the strong pump wave interact nonlinearly through collision dynamics to excite resonance radiation lower than the traditional dispersion radiation wavelength, and high-coherence mid-infrared resonance radiation sidebands are obtained centered on the traditional dispersion radiation wavelength.

2. The method for regulating mid-infrared light field according to claim 1, characterized in that, The input end of the light guiding and intensity confinement heterostructure is connected to the pump source and the weak probe seed, and the weak probe seed is a weak probe wave, which is used to provide seeds for the regulation of the mid-infrared light field.

3. The method for regulating mid-infrared light field according to claim 2, characterized in that, The method for regulating mid-infrared light field further includes: Adjusting the wavelength of the weak probe seed to generate specific mid-infrared laser radiation, and outputting an adjustable lasing wavelength after passing through the light guiding and intensity confinement heterostructure.

4. The method for regulating mid-infrared light field according to claim 1, characterized in that, The transmission characteristics of the light guiding and intensity confinement heterostructure include the dispersion characteristics of the medium and high nonlinear effects.

5. The method for regulating mid-infrared light field according to claim 1, characterized in that, The incident center wavelength of the pump source is 1550 nm, and the bandwidth is 10 nm.

6. The method for regulating mid-infrared light field according to claim 1, characterized in that, The method for regulating mid-infrared light field further includes: The weak probe light pulse realizes wavelength conversion near 3.5 μm through nonlinear interaction.

7. The method for regulating mid-infrared light field according to claim 1, characterized in that, The light guiding and intensity confinement heterostructure realizes phase matching near the wavelength of 3.5 μm in the mid-infrared region to obtain an interaction phase matching point near the wavelength of 3.5 μm.

8. A light guiding and intensity confinement heterostructure, characterized in that, The light guiding and intensity confinement heterostructure includes a silicon nitride core diameter, a silica substrate and a cladding; There is a strong confinement effect between the core diameter of the silicon nitride, the silicon dioxide substrate, and the cladding. The light sources generated by the pump source and the weak probe seed are input into the light-guiding strongly confined heterostructure. When the light source passes through the light-guiding strongly confined heterostructure, the light-guiding strongly confined heterostructure outputs a single-mode waveguide laser with high spatial coherence. The light sources generated by the pump source and the weak probe seed include a strong pump wave, a first weak probe wave, and a second weak probe wave. The strong pump wave is a soliton that maintains its shape during transmission and is distributed in the anomalous dispersion region. The first weak probe wave and the second weak probe wave are distributed around the strong pump wave. The first weak probe wave and the strong pump wave interact nonlinearly to excite resonance radiation with a wavelength exceeding the traditional dispersion radiation wavelength. The second weak probe wave and the strong pump wave interact nonlinearly through collision dynamics to excite resonance radiation with a wavelength lower than the traditional dispersion radiation wavelength. Centered on the traditional dispersion radiation wavelength, a mid-infrared resonance radiation sideband with high coherence is obtained.

9. The light-guiding strongly confined heterostructure according to claim 8, wherein, the width of the silicon nitride core diameter in the light-guiding strongly confined heterostructure is 0.87 μm, the height is 1.7 μm, and the length is 10 mm.

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