An apparatus for supercontinuum generation

Abstract

This invention relates to a supercontinuum generation device, comprising a pump source, a concave mirror, a resonant cavity, a concave beam splitter, and a collimating mirror. The pump source is used to output quasi-monochromatic laser light and transmit it to the resonant cavity. The resonant cavity is sealed and filled with gas, and its first and second walls are arranged opposite each other on the optical path and are both transparent walls. The concave mirror and the concave beam splitter are located beside the first and second walls, respectively, and form an optical path with the first and second walls. The concave mirror and the concave beam splitter are confocal, and the focal point is located inside the resonant cavity. The concave beam splitter, in addition to being used to generate supercontinuum, also serves to transmit quasi-monochromatic laser light. The continuous spectrum output to the collimating mirror is also used to reflect the quasi-monochromatic laser in the supercontinuum spectrum back into the resonant cavity through the second wall. The concave mirror is used to reflect the light transmitted from the first wall back into the resonant cavity through the first wall. The collimating mirror is used to output the collimated supercontinuum spectrum. This invention achieves the focusing of high-energy beams and the effective multiplication and amplification of photons through the confocal setting of the concave mirror and the concave beam splitter, as well as the enhancement effect of the resonant cavity. In turn, it generates a supercontinuum spectrum through nonlinear effects, which significantly reduces the technical requirements for the laser source and makes it easy to generate a supercontinuum spectrum.

Description

Technical Field

[0001] This invention relates to the field of laser technology, and more specifically, to a supercontinuum generation device. Background Technology

[0002] Supercontinuum lasers are multicolor lasers with an extremely wide spectral range, reaching thousands or even tens of thousands of nanometers. These lasers not only possess all the characteristics of lasers, such as high brightness, strong coherence, and good directionality, but also have unique light source characteristics such as a wide spectral range and good spatial coherence.

[0003] In gaseous media, the generation of supercontinuum primarily relies on the nonlinear interaction between a strong laser pulse and gas molecules. Generating supercontinuum in gaseous media places high demands on the laser source, requiring it to possess the following three optical characteristics: First, sufficiently high peak power to induce strong nonlinear effects in the gaseous medium. A high peak power laser pulse can generate a stronger electric field, thus significantly interacting with the electric field within the gas molecules. Second, short pulse width: a short pulse width facilitates the rapid establishment of nonlinear effects in the gaseous medium, avoiding the thermal effects and damage that may occur with long pulses. Third, good beam quality: the laser beam needs good spatial and temporal coherence to ensure a stable energy distribution and phase relationship during propagation in the gaseous medium. Therefore, existing technologies for generating supercontinuum in gaseous media place extremely stringent requirements on the laser source characteristics. These requirements are often difficult to simultaneously meet in practice, increasing the difficulty and cost of implementation. Therefore, there is an urgent need in this field to propose an innovative supercontinuum generation technology aimed at significantly lowering the technical barriers to laser sources, making them easier to implement and widely adopted. Summary of the Invention

[0004] Based on this, and to address the above problems, the present invention provides a supercontinuum generation device that reduces the technical requirements for the laser source and makes it easy to generate supercontinuum spectra.

[0005] To achieve the above objectives, the present invention provides a supercontinuum generation device, comprising a pump source, a concave mirror, a resonant cavity, a concave beam splitter, and a collimating lens. The pump source is used to output quasi-monochromatic laser light and transmit it to the resonant cavity. The resonant cavity is sealed and filled with gas, and its first wall and second wall are arranged opposite each other on the optical path, both of which are transparent walls. The concave mirror and the concave beam splitter are located on the sides of the first wall and the second wall, respectively, and form an optical path with the first wall and the second wall. The concave mirror and the concave beam splitter are confocal, and the focal point is located inside the resonant cavity. In addition to outputting the supercontinuum spectrum to the collimating lens, the concave beam splitter is also used to reflect the quasi-monochromatic laser light in the supercontinuum spectrum back into the resonant cavity through the second wall. The concave mirror is used to reflect the light transmitted from the first wall back into the resonant cavity through the first wall. The collimating lens is used to output the collimated supercontinuum spectrum.

[0006] In one embodiment, the focal point of the concave reflector and the concave beam splitter is located at the center of the resonant cavity.

[0007] In one embodiment, the first wall and / or the second wall are coated with an antireflective film.

[0008] In one embodiment, the concave mirror is coated with a reflective film, and the concave beam splitter is coated with a reflective film of a preset wavelength band.

[0009] In one embodiment, the concave reflector and / or concave beam splitter is connected to a five-dimensional adjuster.

[0010] In one embodiment, the gas filled in the resonant cavity is at least one of hydrogen, helium, argon, xenon, and krypton.

[0011] In one embodiment, the resonant cavity further includes an enclosing wall forming a sealed cavity, the number of which is one or at least four, and the enclosing wall is made of aluminum, aluminum alloy or stainless steel.

[0012] In one embodiment, a pressure regulating valve is provided on at least one of the enclosing walls.

[0013] In one embodiment, a temperature monitor is provided on the outside of at least one enclosing wall.

[0014] In one embodiment, a light-transmitting window is provided on at least one enclosing wall, through which quasi-monochromatic laser light output from the pump light source is transmitted to the resonant cavity.

[0015] In one embodiment, the concave reflector has a light-transmitting hole, and the quasi-monochromatic laser output from the pump light source is transmitted from the light-transmitting hole to the first wall and then to the resonant cavity.

[0016] In one embodiment, a laser power monitor is provided at a position between the concave reflector and the first wall, and between the second wall and the concave beam splitter.

[0017] In one embodiment, the quasi-monochromatic laser output by the pump source is green light.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] This invention features a concave reflector and a concave beam splitter confocally positioned upstream and downstream of the optical path in the resonant cavity, with their focal points located within the resonant cavity. Their function is to enhance the optical field intensity within the resonant cavity and control the optical path. The concave reflector reflects the light transmitted from the first wall back into the resonant cavity, while the concave beam splitter outputs a portion of the supercontinuum spectrum to the collimating lens and reflects the remaining quasi-monochromatic laser or other components of the light wave back into the resonant cavity. The reflected laser enters the resonant cavity and undergoes multiple resonances, enhancing the electric field intensity of the light wave within the resonant cavity. This invention can more effectively utilize pump light energy, significantly reducing the energy and quality requirements of the pump light, improving the generation efficiency of the supercontinuum spectrum, and enhancing the flexibility and convenience of the supercontinuum spectrum generation technology. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the supercontinuum generation device in one embodiment of the present invention;

[0021] Figure 2 This is a schematic diagram of the supercontinuum generation device in another embodiment of the present invention;

[0022] Figure 3 This is a schematic diagram of the supercontinuum generation device in the third embodiment of the present invention. Detailed Implementation

[0023] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0024] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0025] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0026] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0027] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0028] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0029] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] like Figures 1-2As shown, this embodiment provides a supercontinuum generation device, including a pump source 10, a concave mirror 20, a resonant cavity 30, a concave beam splitter 40, and a collimating mirror 50. The pump source 10 is used to output quasi-monochromatic laser light and transmit it to the resonant cavity 30. A focusing element (not shown in the figure) is set in the optical path of the quasi-monochromatic laser light transmission to the resonant cavity to focus the quasi-monochromatic laser light into the resonant cavity to form a high-intensity laser. The resonant cavity 30 is sealed and filled with any one or more gases selected from hydrogen, helium, argon, xenon, and krypton. These gases exhibit strong nonlinear optical properties under the action of the high-intensity laser. The first wall 31 and the second wall 32 of the resonant cavity 30 are arranged opposite each other in the optical path and are both transparent walls, allowing the laser light to enter and leave the resonant cavity 30 while maintaining the stability of the gas pressure and temperature inside the resonant cavity 30. The concave mirror 20 and the concave beam splitter 40 are located on the sides of the first wall 31 and the second wall 32, respectively, and form an optical path with the first wall 31 and the second wall 32. The concave reflector 20 and concave beam splitter 40 are confocally arranged with their focal point located within the resonant cavity 30. They are used to enhance the light field intensity within the resonant cavity 30 and control the optical path. The concave reflector 20 and concave beam splitter 40 reflect light back into the resonant cavity, forming a high electric field intensity at the focal point, thereby improving the supercontinuum spectrum generation efficiency. The concave beam splitter 40 is used, on the one hand, to output the supercontinuum spectrum to the collimating lens 50, and on the other hand, to reflect the quasi-monochromatic laser in the supercontinuum spectrum back into the resonant cavity 30 through the second wall. The concave reflector 20 is used to reflect the light transmitted from the first wall 31 back into the resonant cavity 30 through the first wall 31 to enhance the nonlinear interaction within the cavity. The collimating lens 50 is used to output the collimated supercontinuum spectrum. The supercontinuum spectrum, after being sufficiently broadened and increased in gain, is output to the collimating lens through the concave beam splitter. The collimating lens is responsible for collimating the output supercontinuum spectrum, that is, correcting its propagation direction and optimizing its beam quality to facilitate subsequent applications. For example, the pump source outputs a quasi-monochromatic high-energy narrow-linewidth laser beam. This laser beam serves as the initial light source and is transmitted to the resonant cavity through the optical path. The quasi-monochromatic laser interacts with light waves of its own frequency or other frequencies in the gas medium, inducing nonlinear optical processes such as four-wave mixing, self-phase modulation (SPM), and cross-phase modulation (XPM), resulting in the broadening of the laser spectrum and the generation of a supercontinuum spectrum. The concave mirror 20 reflects the light transmitted from the first wall back into the resonant cavity 30 for multiple resonances. The concave beam splitter 40 outputs the supercontinuum spectrum backward and reflects the quasi-monochromatic laser back into the resonant cavity 30 for multiple resonances, enhancing the electric field intensity of the light waves in the resonant cavity 30. This makes the electric field intensity of the light waves in the resonant cavity 30 comparable to the electric field inside the atoms of the medium, thereby successfully generating nonlinear effects and improving the supercontinuum spectrum generation efficiency.In this embodiment, through repeated reflections by the concave reflector 20 and the concave beam splitter 40, the pump laser and the supercontinuum spectrum generated within the resonant cavity form a cycle, continuously interacting nonlinearly with the gas medium, resulting in sustained spectral broadening and gain. In this process, the resonant cavity not only enhances the nonlinear generation effect but also selects spectral components. The overall device reduces the requirements for the pump source, making it easier to implement, and it also achieves energy recycling, saving energy.

[0031] like Figure 3 As shown, in one embodiment, this embodiment provides a supercontinuum generation device, including a pump source 10, a concave mirror 20, a resonant cavity 30, a concave beam splitter 40, and a collimating mirror 50 arranged sequentially along the optical path. The pump source 10 is used to output quasi-monochromatic laser. The resonant cavity 30 is sealed and filled with any one or more gases selected from hydrogen, helium, argon, xenon, and krypton. The first wall 31 and the second wall 32 of the resonant cavity 30 are arranged opposite each other on the optical path and are both transparent walls, allowing the laser to enter and leave the resonant cavity 30 while maintaining the stability of the gas pressure and temperature inside the resonant cavity 30. The concave mirror 20 and the concave beam splitter 40 are respectively arranged downstream of the resonant cavity 30 on the optical path, forming an optical path with the first wall 31 and the second wall 32 of the resonant cavity 30. The concave mirror 20 and the concave beam splitter 40 are confocal and the focal point is located at the resonant cavity 30. Inside cavity 30, the quasi-monochromatic laser output from the pump source 10 is transmitted to the concave beam splitter 40. After receiving the quasi-monochromatic laser, the concave beam splitter 40 focuses the light spot at the focal point, forming a high electric field intensity of the light wave. This generates a supercontinuum spectrum by interacting with the gas in the resonant cavity 30 in a nonlinear manner. The concave reflector 20 reflects the light transmitted from the first wall 31 back to the resonant cavity 30. The concave beam splitter 40 is responsible for outputting part of the supercontinuum spectrum to the collimating lens, while reflecting the remaining quasi-monochromatic laser or other light waves back to the resonant cavity 30. The reflected laser enters the resonant cavity and resonates multiple times, enhancing the electric field intensity of the light waves in the resonant cavity. This embodiment can utilize the pump light energy more effectively, significantly reducing the energy and quality requirements of the pump light, improving the generation efficiency of the supercontinuum spectrum, and enhancing the flexibility and convenience of the supercontinuum spectrum generation technology. Preferably, with the horizontal plane as the reference plane, the concave reflector 20 and the concave beam splitter 40 are perpendicular to the horizontal plane. The quasi-monochromatic laser output from the pump source 10 is transmitted parallel to the horizontal plane to the concave beam splitter 40, which focuses the monochromatic laser at the focal point. Optionally, the quasi-monochromatic laser output from the pump source 10 can also be directly transmitted to the concave reflector 20. After receiving the quasi-monochromatic laser, the concave reflector 20 focuses the light spot at the focal point, forming a high electric field intensity of the light wave. This generates a supercontinuum spectrum by interacting with the gas in the resonant cavity 30 through a nonlinear effect.

[0032] In one embodiment, the pump source is a tunable laser capable of outputting quasi-monochromatic lasers of different wavelengths to meet the needs of supercontinuum generation under different gas media.

[0033] In one embodiment, the concave reflector 20 and the concave beam splitter 40 are confocal, with the focal point located at the center of the resonant cavity 30. The concave surfaces of both the concave reflector 20 and the concave beam splitter 40 face the resonant cavity 30. The concave reflector 20 and the concave beam splitter 40 precisely reflect and focus light from all directions onto the center of the resonant cavity. The pump light is also focused at the center of the resonant cavity, resulting in a highly converged beam of ultra-high energy density with ultra-high electric field intensity. The reflected light, acting as the pump source, enhances energy, reducing the energy and quality requirements of the pump light and making it more conducive to generating a supercontinuum spectrum. The supercontinuum spectrum generation device provided in this embodiment, through the confocal design of the concave reflector and the concave beam splitter, and the enhancement effect of the resonant cavity, achieves the focusing of a high-energy beam and the effective proliferation and amplification of photons, thereby generating a supercontinuum spectrum through nonlinear effects.

[0034] In one embodiment, the first wall 31 and / or the second wall 32 are coated with an antireflective film to facilitate the smooth transmission of light along the optical path. It is understood that the antireflective film can also be installed on the first wall and / or the second wall by means of adhesive bonding or other methods.

[0035] In one embodiment, the concave reflector 20 is coated with a full-band reflective film, and the concave beam splitter 40 is coated with a preset-band reflective film, such as a green light reflective film or a other-band light transmission film. The coating reflects the preset-band light through the second wall 32 into the resonant cavity 30, serving as energy supplement for the pump light, reducing the energy and quality requirements of the pump light, and improving the generation efficiency of the supercontinuum spectrum. It should be noted that since the supercontinuum spectrum itself is a continuous and broadband spectral range covering multiple bands from ultraviolet to infrared, the spectrum after filtering out a certain preset band (such as green light) can still be called a supercontinuum spectrum.

[0036] In one embodiment, the concave reflector 20 and / or the concave beam splitter 40 are connected to a five-dimensional adjuster (not shown in the figure), which can be adjusted up and down, left and right, front and back, plane angle, and z-axis angle to facilitate adjusting the concave reflector 20 and / or the concave beam splitter 40 to the optimal position.

[0037] In one embodiment, the resonant cavity 30 further includes an enclosure wall 33 forming a sealed cavity. The number of enclosure walls 33 is one curved surface that encloses the resonant cavity into a cylinder or at least four surfaces that enclose the resonant cavity into a polyhedron. The enclosure walls 33 are made of opaque materials such as aluminum, aluminum alloy or stainless steel. The enclosure walls 33 are sealed to the first wall 31 and the second wall 32.

[0038] In one embodiment, a pressure regulating valve 60 is provided on at least one enclosing wall 33. Preferably, the air pressure in the resonant cavity 30 is 1.5-12 MPa, and the pressure regulating valve 60 is communicatively connected to a control system (not shown in the figure), which can realize precise adjustment and stabilization of the air pressure in the resonant cavity, ensuring the stable generation of the supercontinuum spectrum.

[0039] In one embodiment, a temperature monitor 70 is provided on the outside of at least one enclosing wall 33. The temperature monitor 70 is communicatively connected to the control system. Under normal operation, the propagation path of the laser beam in the supercontinuum generation device provided in this embodiment cannot exceed the cavity range of the resonant cavity 30, nor can it propagate onto the enclosing wall 33. If the laser beam propagates onto any one of the enclosing walls 33, the temperature of the enclosing wall will rise. The temperature monitor 70 on the outside of the enclosing wall 33 can realize the temperature monitoring and display of the resonant cavity 30. If the temperature exceeds the preset range, a prompt or alarm message will be output to indicate that the laser beam has deviated from the normal transmission path.

[0040] In one embodiment, a light-transmitting window 80 is provided on at least one enclosing wall 33, through which quasi-monochromatic laser output from the pump light source 10 is transmitted to the resonant cavity 30.

[0041] In one embodiment, the concave reflector 20 has a light-transmitting hole (not shown in the figure), and the quasi-monochromatic laser output by the pump light source 10 is transmitted from the light-transmitting hole to the first wall 31 and then to the resonant cavity 30.

[0042] In one embodiment, under normal operation, the propagation path of the laser beam in the provided supercontinuum generation device must not exceed the cavity range of the resonant cavity 30. A laser power monitor 90 is installed between the concave reflector 20 and the first wall 31, and between the second wall 32 and the concave beam splitter 40. When a laser power value is detected in this area, a prompt or alarm message is output to indicate that the laser beam has deviated from the normal propagation path. Furthermore, the laser power monitor 90 is connected to a rotatable base, which drives the laser power monitor 90 to perform scanning monitoring in the gap area between the concave reflector 20 and the first wall 31, and between the second wall 32 and the concave beam splitter 40, so that its monitoring area covers the entire gap position, resulting in higher monitoring accuracy.

[0043] In one embodiment, the quasi-monochromatic laser output by the pump source is green light. The green light resonates multiple times in the resonant cavity, making it easier to generate electromagnetic waves with wavelengths between 400-500 nanometers. The concave reflector 20 is coated with a green light reflective film and a light transmission film for other wavelength bands. This coating reflects the green light through the second wall 32 into the resonant cavity 30, serving as energy supplementation for the pump light, reducing the energy and quality requirements of the pump light, and improving the generation efficiency of the supercontinuum spectrum.

[0044] It should be noted that, for those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention, and no reference numerals in the claims should be construed as limiting the scope of the claims.

[0045] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A supercontinuum generation device, characterized in that: This includes a pump source, a concave mirror, a resonant cavity, a concave beam splitter, and a collimating mirror. The pump light source is used to output quasi-monochromatic laser light and transmit it to the resonant cavity; The resonant cavity includes an enclosing wall, a first wall, and a second wall. The enclosing wall is sealed to the first wall and the second wall to form a sealed cavity. The resonant cavity is sealed and filled with gas. The first wall and the second wall are arranged opposite each other on the optical path and are both light-transmitting walls. A temperature monitor is provided on the outside of at least one of the enclosing walls to indicate whether the laser beam has deviated from the normal transmission path. The concave reflector and the concave beam splitter are located on the sides of the first wall and the second wall, respectively, and form an optical path with the first wall and the second wall. The concave reflector and the concave beam splitter are confocal and the focal point is located in the resonant cavity. The concave reflector is coated with a reflective film, and the concave beam splitter is coated with a preset band reflective film. In addition to outputting the supercontinuum spectrum to the collimating lens, the concave beam splitter is also used to reflect the quasi-monochromatic laser in the supercontinuum spectrum back into the resonant cavity through the second wall. The concave reflector is used to reflect the light transmitted from the first wall back into the resonant cavity through the first wall to enhance the electric field intensity of the light field in the resonant cavity and realize the proliferation and amplification of photons. A laser power monitor is set between the concave reflector and the first wall, and between the second wall and the concave beam splitter to indicate whether the laser beam deviates from the normal transmission path. The collimating lens is used to output the collimated supercontinuum spectrum.

2. The supercontinuum generation device according to claim 1, characterized in that: The focal points of the concave reflector and the concave beam splitter are located at the center of the resonant cavity.

3. The supercontinuum generation device according to claim 1, characterized in that: The first wall and / or the second wall are coated with an anti-reflection film.

4. The supercontinuum generation device according to claim 1, characterized in that: The concave reflector and / or concave beam splitter are connected to the five-dimensional adjuster.

5. The supercontinuum generation device according to claim 1, characterized in that: The gas filled in the resonant cavity is at least one of hydrogen, helium, argon, xenon, and krypton.

6. The supercontinuum generation device according to claim 1, characterized in that: The enclosing wall is made of aluminum, aluminum alloy, or stainless steel.

7. The supercontinuum generation device according to claim 6, characterized in that: A pressure regulating valve is provided on at least one of the enclosing walls.

8. The supercontinuum generation device according to claim 6, characterized in that: A light-transmitting window is provided on at least one enclosing wall, through which quasi-monochromatic laser output from the pump light source is transmitted to the resonant cavity.

9. The supercontinuum generation device according to claim 1, characterized in that: The concave mirror has a light-transmitting hole, and the quasi-monochromatic laser output from the pump light source is transmitted from the light-transmitting hole to the first wall and then to the resonant cavity.

10. A supercontinuum generation apparatus according to any one of claims 1-9, characterized in that: The quasi-monochromatic laser output by the pump source is green light.

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