Asymmetric spherical cylindrical surface optical multi-pass cell and design method thereof

Abstract

The invention relates to the technical field of optical detection, in particular to an asymmetric spherical cylindrical surface optical multi-pass cell and a calculation method thereof. The invention provides an asymmetric spherical and cylindrical surface optical multi-pass pool, which comprises a spherical reflector and a cylindrical reflector, and the spherical reflector and the cylindrical reflector are both concave reflection, are oppositely arranged and are coaxial; at least one of the two reflectors is provided with a light hole. According to the invention, Lissajous light spot pattern distribution can be realized without rotating the reflector, the utilization rate of the mirror surface is high, and long optical path can be realized. And the relative rotation angle of the two reflectors in the optical axis direction can be kept, the stability of light spot patterns is guaranteed, namely the stability of the light reflection and propagation space path is guaranteed, and therefore the light absorption efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of optical detection, and in particular to an asymmetric spherical-cylindrical optical multipass cell and its design method. Background Art

[0002] An optical multipass cell enables light to be transmitted multiple times between mirrors through optical design, and can effectively increase the optical path within a relatively small volume. Since the effective distance of the interaction between light and matter determines key indicators such as the sensitivity of optical measurement, the optical multipass cell has been widely used in fields such as absorption spectroscopy detection and photoacoustic spectroscopy detection. An optical multipass cell usually consists of two or more mirrors, and common types include White-type multipass cells, Herriott-type multipass cells, astigmatic multipass cells, double cylindrical mirror multipass cells, etc.

[0003] Multipass cells represented by the White-type multipass cell, which are composed of three or more mirrors, are more complex in structure and have disadvantages in terms of stability compared to multipass cells composed of two mirrors. Herriott-type, astigmatic, and double cylindrical mirror multipass cells are all composed of two mirrors. The traditional Herriott-type multipass cell can form a circular light spot distribution on the mirror surface, but the mirror surface utilization rate is low, and the number of reflections obtained under the same volume is limited, resulting in a limited effective optical path. The improved Herriott-type multipass cell can have a dense light spot distribution, but requires a large optical incident angle, a small focal length of the mirror, and a short physical base length. Therefore, the effective optical path length is limited, and multiple circularly distributed light spot patterns make it easy for other light spots to escape near the exit hole. The astigmatic multipass cell consists of two astigmatic mirrors (tire mirrors), which overcomes the disadvantages of the Herriott multipass cell, effectively utilizes the cavity mirror area, and can form a Lissajous figure light spot distribution on the mirror surface. However, the tire mirror has different focal lengths in the x and y directions, with complex processing technology, high cost, and low consistency. Moreover, the two mirrors need to have a relative rotation angle along the optical axis direction, and the light spot distribution is very sensitive to this rotation angle. The double cylindrical mirror multipass cell can also form a Lissajous figure light spot distribution on the mirror surface, but also requires a relative rotation angle between the two mirrors along the optical axis direction and is very sensitive to this angle. Summary of the Invention

[0004] In order to overcome the defects of the above-mentioned existing multipass cells, such as complex structure and low stability, the present invention proposes an asymmetric spherical-cylindrical optical multipass cell, which has a simple structure, is immune to mirror rotation, and has excellent consistency.

[0005] An asymmetric spherical-cylindrical optical multipass cell proposed by the present invention includes a spherical mirror and a cylindrical mirror. Both the spherical mirror and the cylindrical mirror are concave mirrors, and they are oppositely arranged and coaxial; at least one of the two mirrors is provided with an aperture.

[0006] Preferably, the optical aperture is located at the center of the spherical mirror.

[0007] Preferably, the projection of the cylindrical mirror on the x-y plane is located within the inner circumference of the spherical mirror.

[0008] A design system for an asymmetric spherical-cylindrical optical multi-pass cell proposed by the present invention determines the radius of curvature of the spherical mirror and the radius of curvature of the cylindrical mirror, co-axially arranges the spherical mirror and the cylindrical mirror relatively and adjusts the relative distance. The two are used as the incident mirror and the retroreflector respectively, and an incident aperture is provided on the incident mirror.

[0009] Combined with the angle of the incident aperture, the incident light equation is determined, and the intersection point of the incident light equation and the retroreflector is calculated as the reflection point.

[0010] Determine the retroreflection equation of the incident light after reflection at the reflection point, calculate the intersection point of the retroreflection equation and the incident mirror as the latest reflection point; determine the incident light equation of the retroreflection after reflection at the reflection point, calculate the intersection point of the incident light equation and the retroreflector as the latest reflection point; iterate until the number of light rays between the incident mirror and the retroreflector reaches the set value.

[0011] Determine the area of the spherical mirror and the area of the cylindrical mirror to form a multi-pass cell design scheme {spherical area, spherical radius of curvature; cylindrical radius of curvature, cylindrical area; relative distance, incident angle}.

[0012] Preferably, according to the requirement of the number of light spots, an exit aperture is provided at the intersection of the last light ray's exit direction and the mirror surface.

[0013] A design method for an asymmetric spherical-cylindrical optical multi-pass cell proposed by the present invention determines the radius of curvature and area of the spherical mirror and the radius of curvature and area of the cylindrical mirror, arranges the two relatively and coaxially, and adjusts the relative distance between them.

[0014] An optical aperture is provided on one of the mirrors, and the mirror where the optical aperture is located is denoted as the incident mirror, and the other mirror is denoted as the retroreflector.

[0015] Combined with the angle of the optical aperture, the incident light equation is determined, and the intersection point of the incident light equation and the retroreflector is calculated as the reflection point.

[0016] Determine the retroreflection equation of the incident light after reflection at the reflection point, calculate the intersection point of the retroreflection equation and the incident mirror as the latest reflection point; determine the incident light equation of the retroreflection after reflection at the reflection point, calculate the intersection point of the incident light equation and the retroreflector as the latest reflection point; iterate until the light ray exits through the optical aperture, and calculate the number of light rays between the incident mirror and the retroreflector.

[0017] Determine the area of the spherical mirror and the area of the cylindrical mirror to form a multi-pass cell design scheme {spherical area, spherical radius of curvature; cylindrical radius of curvature, cylindrical area; relative distance, incident angle}.

[0018] Preferably, the optical aperture is located at the center of the spherical mirror or the cylindrical mirror.

[0019] A design method of an asymmetric spherical-cylindrical optical multipass cell proposed by the present invention determines the radius of curvature and area of the spherical mirror and the radius of curvature and area of the cylindrical mirror, sets the two relatively and coaxially, and adjusts the relative distance between the two;

[0020] An optical aperture is arranged on one of the mirrors, and the mirror where the optical aperture is located is denoted as the incident mirror, and the other mirror is denoted as the retroreflector;

[0021] Combined with the angle of the optical aperture, the incident light equation is determined, and the intersection point of the incident light equation and the retroreflector is calculated as the reflection point;

[0022] Determine the retroreflection equation of the incident light after reflection by the reflection point, and calculate the intersection point of the retroreflection equation and the incident mirror as the latest reflection point; determine the incident light equation of the retroreflection after reflection by the reflection point, and calculate the intersection point of the incident light equation and the retroreflector as the latest reflection point; iterate until the number of light rays between the incident mirror and the retroreflector reaches the set value, then project the light spots on the two mirrors onto the x-y plane to obtain the light spot pattern;

[0023] Adjust the distance between the two mirrors and the light incident angle of the optical aperture until a light spot pattern that meets the set conditions is obtained, and an exit hole is arranged at the intersection point of the last light ray exit direction and the mirror.

[0024] Preferably, the set condition is that the uniformity of the light spots on the light spot pattern reaches the set value.

[0025] A design system of an asymmetric spherical-cylindrical optical multipass cell proposed by the present invention includes a memory and a processor. A computer program is stored in the memory, and the processor is connected to the memory. The processor is used to execute the computer program to implement the design method of the asymmetric spherical-cylindrical optical multipass cell.

[0026] The advantages of the present invention are as follows:

[0027] An asymmetric spherical-cylindrical optical multipass cell proposed by the present invention is a multipass cell formed by the cooperation of a spherical mirror and a cylindrical mirror. It can realize the Lissajous light spot pattern distribution without rotating the mirror, has a high mirror utilization rate, and can achieve a long optical path. Moreover, it can immunize the relative rotation angle of the two mirrors along the optical axis direction, ensure the stability of the light spot pattern, that is, ensure the stability of the spatial path of light reflection and propagation, thereby improving the light absorption efficiency.

[0028] The present invention consists of only two reflecting mirrors, with a simple and stable structure. The processing technologies of spherical mirrors and cylindrical mirrors are mature and simple, with low cost and good consistency. The multi-pass cell formed by the cooperation of spherical reflecting mirrors and cylindrical reflecting mirrors is conducive to ensuring the consistency of structural parameters and improving the factory quality.

[0029] The design method of the asymmetric spherical-cylindrical optical multi-pass cell proposed by the present invention can achieve a relatively divergent light spot distribution around the light input and output apertures through design, avoiding the escape of other light spots, so as to provide corresponding asymmetric spherical-cylindrical optical multi-pass cells for different scenario requirements. Brief Description of the Drawings

[0030] Figure 1 It is a structural diagram of an asymmetric spherical-cylindrical optical multi-pass cell proposed by the present invention;

[0031] Figure 2 It is a schematic diagram of light reflection;

[0032] Figure 3(a) shows the light reflection display of the multi-pass cell of the present invention;

[0033] Figure 3(b) is the light spot pattern corresponding to the spherical reflecting mirror in the experiment of Figure 3(a);

[0034] Figure 3(c) is the light spot pattern corresponding to the cylindrical reflecting mirror in the experiment of Figure 3(a);

[0035] Figure 4(a) is the light spot pattern of the spherical reflecting mirror calculated in Example 1;

[0036] Figure 4(b) is the light spot pattern of the cylindrical reflecting mirror calculated in Example 1;

[0037] Figure 5(a) is the light spot pattern of the spherical reflecting mirror obtained by experiment in Example 1;

[0038] Figure 5(b) is the light spot pattern of the cylindrical reflecting mirror obtained by experiment in Example 1;

[0039] Figure 6(a) is the light spot pattern of the spherical reflecting mirror calculated in Example 2;

[0040] Figure 6(b) is the light spot pattern of the cylindrical reflecting mirror calculated in Example 2;

[0041] Figure 7(a) is the light spot pattern of the spherical reflecting mirror obtained by experiment in Example 2;

[0042] Figure 7(b) is the light spot pattern of the cylindrical reflecting mirror obtained by experiment in Example 2. Detailed Embodiments

[0043] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0044] Referring to Figure 1 , an asymmetric spherical-cylindrical optical multipass cell proposed in this embodiment includes a spherical mirror and a cylindrical mirror 2. Both the spherical mirror and the cylindrical mirror 2 are concave mirrors, and they are arranged opposite to each other and coaxial. That is, the central axes of the spherical mirror and the cylindrical mirror 2 are collinear.

[0045] At least one of the two mirrors is provided with an optical hole 10, and the optical hole 10 is offset from the central axis of the mirror. Light enters the multipass cell through the optical hole 10 and exits through the optical hole after reflection. The combination of the asymmetric spherical and cylindrical mirrors can achieve a Lissajous figure distribution of the light spot, and the presence of the spherical mirror makes it immune to the relative rotation angle of the two mirrors along the optical axis. In addition, the processing technologies of the spherical mirror and the cylindrical mirror are both mature and simple, and the consistency is good.

[0046] In the embodiment shown in Fig. 3(a), the radius of curvature of the spherical mirror is 1000 mm, the radius of curvature of the cylindrical mirror is 800 mm, the center distance between the two mirrors is 365.91 mm, and the light is reflected 415 times after entering the multipass cell. Since the hole is opened at the center position of the spherical mirror, 207 light spots are distributed on the spherical mirror, as shown in Fig. 3(b); 208 light spots are distributed on the cylindrical mirror, as shown in Fig. 3(c); the effective optical path is about 152.22 m.

[0047] It can be seen from the above experiments that the light spots on the spherical mirror are more divergent. In specific implementation, a smaller mirror surface can be used for the cylindrical mirror to improve the utilization rate of the mirror surface.

[0048] The spatial spherical equation is:

[0049] (x - O sx ) 2 +(y - O sy ) 2 +(z - O sz ) 2 + = R s 2 (1)

[0050] Where, (O sx , O sy , O sz ) is the spatial coordinate of the center of the spherical surface of the sphere, and R s is the radius of curvature of the spherical mirror.

[0051] The equation of the spatial cylindrical surface is:

[0052] (x - O cx ) 2 +(z - O cz ) 2 + = R c 2 (2)

[0053] Where, (O cx , O cz ) is the center of the circle where the cylindrical surface is projected onto the xz plane, and R c is the radius of curvature of the cylindrical mirror; the generatrix of this cylindrical surface is parallel to the y-axis.

[0054] Taking the example of opening a hole at the center of a spherical mirror, when the incident light enters through aperture 10 and hits the cylindrical mirror 2, after reflection, it hits the spherical mirror, and so on. The calculation process is as follows:

[0055] Step 1: Calculate the spot coordinates formed when the incident light hits the cylindrical mirror 2, that is, first solve the solution of the system of equations of the spatial straight line and the spatial cylindrical surface;

[0056] Step 2: Calculate the propagation direction of the light after reflection by the cylindrical mirror 2, that is, solve the vector after the spatial vector is reflected by the cylindrical mirror;

[0057] Step 3: Calculate the spot coordinates formed when the reflected light hits the spherical mirror, that is, first solve the solution of the system of equations of the spatial straight line and the spatial spherical surface;

[0058] Step 4: Calculate the propagation direction of the light after reflection by the spherical mirror, that is, solve the vector after the spatial vector is reflected by the spherical mirror;

[0059] … Repeat the above steps until the spot exits through aperture 10.

[0060] Define the coordinates (x0, y0, z0) of the initial incident light passing through the aperture and the initial transmission direction vector Then it can be expressed by the point-direction equation of the spatial straight line as:

[0061]

[0062] According to the first step of the calculation process, the coordinates (x1, y1, z1) of the first spot formed on the cylindrical mirror can be obtained by solving the system of equations composed of equations (2) and (3), that is:

[0063]

[0064] The solution is:

[0065]

[0066] It should be noted that a straight line and a cylindrical surface usually have two intersection points (except in the case of tangency). Therefore, this system of equations usually has two solutions. Boundary conditions need to be set according to the actual size and position of the cylindrical mirror to screen out the correct solutions.

[0067] When calculating the propagation direction after reflection in the second step, the method of spatial vectors can be used, such as Figure 2 As shown, after the incident light passes through point A and hits point B on the cylindrical mirror 2, reflection occurs, and the reflected light passes through point C. Solving the vector can obtain the propagation direction of the laser after reflection.

[0068]

[0069] For the cylindrical surface represented by Equation (2), it can be calculated by projecting onto the xoz plane (which is an arc) and the yoz plane (which is a straight line) respectively. Therefore, the propagation direction of the light after reflection by the cylindrical mirror is:

[0070] Similar to the first step, the spot coordinates (x2, y2, z2) formed on the spherical mirror in the third step can be solved by solving the system of equations composed of Equation (1) and (3), that is:

[0071]

[0072] Similar to the second step, in the fourth step, calculate the propagation direction after reflection by the spherical mirror is

[0073]

[0074] Repeat the above steps until the spot exits from the hole.

[0075] The following combines specific embodiments to verify the multi-pass cell with a central opening in the spherical mirror.

[0076] Embodiment 1

[0077] Let the radius of curvature of the spherical mirror be 1000 mm, the radius of curvature of the cylindrical mirror be 800 mm, and the center distance between the two mirrors be 277.23 mm. After calculation, the light is reflected 169 times in total after entering the multipass cell, as shown in Figure 3. Since there are openings in the spherical mirror, 84 light spots are distributed on the spherical mirror, as shown in Figure 4(a); 85 light spots are distributed on the cylindrical mirror, as shown in Figure 4(b); the effective optical path is about 47.13 m. Figure 5(a) shows the light spot pattern of the spherical mirror obtained by experiment, and Figure 5(b) shows the light spot pattern of the cylindrical mirror 2 obtained by experiment. By comparing Figure 4(a) with Figure 5(a) and Figure 4(b) with Figure 5(b), it can be seen that the light spot patterns of the mirrors obtained by experiment are in agreement with the calculation results.

[0078] Example 2

[0079] The radius of curvature of the spherical mirror is 1000 mm, the radius of curvature of the cylindrical mirror is 800 mm, and the center distance between the two mirror centers is 227.82 mm. After calculation, the light is reflected 119 times in total after entering the multipass cell. Since there are openings in the spherical mirror, 59 light spots are distributed on the spherical mirror, as shown in Figure 6(a); 60 light spots are distributed on the cylindrical mirror, as shown in Figure 6(b); the effective optical path is about 27.34 m.

[0080] The experimental results are as follows: the light spot pattern of the spherical mirror is shown in Figure 7(a), and the light spot pattern of the cylindrical mirror is shown in Figure 7(b). It can be seen that the experimental results are in agreement with the calculation results.

[0081] From the above experiments, it can be known that the multipass cell formed by the cooperation of the spherical mirror and the cylindrical mirror can realize the Lissajous light spot pattern distribution without rotating the mirror, with high mirror utilization rate and long optical path. And it can be immune to the relative rotation angle of the two mirrors along the optical axis direction, ensuring the stability of the light spot pattern, that is, ensuring the stability of the spatial path of light reflection and propagation, thereby improving the light absorption efficiency.

[0082] The parameters of the multipass cell proposed by the present invention include: the radius of curvature and area of the spherical mirror, the radius of curvature and area of the cylindrical mirror, the position of the light hole, the incident light direction, and the relative distance between the two mirrors.

[0083] It can be seen from the above embodiments that the greater the relative distance between the two mirrors, the more the number of reflections, the longer the effective optical path, and the more dispersed the light spots. However, if the mirrors are small, in the case of a large relative distance, it may cause the light to exit from the outer periphery of the mirror and cannot be effectively reflected; in the case of a small relative distance, it may cause a small number of reflections and the effective optical path cannot meet the requirements, affecting the light absorption efficiency.

[0084] In specific implementation, for the spherical-cylindrical multipass cell proposed by the present invention, the light spot pattern can be calculated for different design schemes, and then the design scheme can be selected according to the light spot pattern.

[0085] For example, when the spherical mirror, cylindrical mirror and relative distance are determined, the spot pattern can be adjusted by adjusting the position of the incident hole and the direction of the incident light. Through experimental verification, in any design scheme, the spot distribution on the spherical mirror is more divergent than that on the cylindrical mirror. Therefore, it is preferred to set the optical hole at the center position of the spherical mirror.

[0086] In specific implementation, when the radius of curvature of the mirror surface, the optical hole and the incident direction are determined, the relative distance can also be adjusted to achieve the target spot pattern; then the size of the mirror surface, that is, the size, can be determined according to the distribution area of the target spot pattern on the mirror surface.

[0087] Of course, for those skilled in the art, the details of the above exemplary embodiments are not limiting to the present invention, and it also includes the same or similar structures that can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be construed as limiting the claimed claim.

[0088] In addition, it should be understood that although this specification is described in terms of embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0089] The technologies, shapes and structures not detailedly described in the present invention are all well-known technologies.

Claims

1. An asymmetric spherical-cylindrical optical multi-pass cell, characterized in that, It includes a spherical mirror (1) and a cylindrical mirror (2). Both the spherical mirror (1) and the cylindrical mirror (2) are concave mirrors, and they are oppositely arranged and coaxial. At least one of the two mirrors is provided with an optical aperture (10).

2. The asymmetric spherical-cylindrical optical multipass cell according to claim 1, characterized in that, The optical aperture (10) is located at the center of the spherical mirror (1).

3. The asymmetric sphero-cylindrical optical multipass cell according to claim 1 or 2, characterized in that, The projection of the cylindrical mirror (2) on the x-y plane is located within the inner circumference of the spherical mirror (1).

4. A design method for an asymmetric spherical-cylindrical optical multipass cell, characterized in that: Determine the spherical curvature radius of the spherical mirror (1) and the curvature radius of the cylindrical mirror (2), arrange the spherical mirror (1) and the cylindrical mirror (2) coaxially and oppositely and adjust the relative distance. The two are respectively used as the incident mirror and the retroreflector mirror, and the incident mirror is provided with an incident aperture. Combine the angle of the incident aperture to determine the incident light equation, and calculate the intersection point of the incident light equation and the retroreflector mirror as the retroreflective point. Determine the retroreflective light equation after the incident light is reflected by the retroreflective point, and calculate the intersection point of the retroreflective light equation and the incident mirror as the latest retroreflective point. Determine the incident light equation after the retroreflective light is reflected by the retroreflective point, and calculate the intersection point of the incident light equation and the retroreflector mirror as the latest retroreflective point. Iterate until the number of light rays between the incident mirror and the retroreflector mirror reaches the set value. Determine the area of the spherical mirror (1) and the area of the cylindrical mirror (2) to form a multipass cell design scheme {spherical area, spherical curvature radius; cylindrical curvature radius, cylindrical area; relative distance, incident angle}.

5. The design method of the asymmetric spherical-cylindrical optical multipass cell according to claim 4, characterized in that, According to the requirement of the number of light spots, set an exit aperture at the intersection point of the last light ray's exit direction and the mirror surface.

6. A design method for an asymmetric spherical-cylindrical optical multipass cell, characterized in that: Determine the curvature radius and area of the spherical mirror (1) and the curvature radius and area of the cylindrical mirror (2), arrange the two oppositely and coaxially, and adjust the relative distance between the two. Set an optical aperture on one of the mirrors, denote the mirror where the optical aperture is located as the incident mirror, and denote the other mirror as the retroreflector mirror. Combine the angle of the optical aperture to determine the incident light equation, and calculate the intersection point of the incident light equation and the retroreflector mirror as the retroreflective point. Determine the retroreflective light equation after the incident light is reflected by the retroreflective point, and calculate the intersection point of the retroreflective light equation and the incident mirror as the latest retroreflective point. Determine the incident light equation after the retroreflective light is reflected by the retroreflective point, and calculate the intersection point of the incident light equation and the retroreflector mirror as the latest retroreflective point. Iterate until the light rays exit through the optical aperture, and calculate the number of light rays between the incident mirror and the retroreflector mirror. Determine the area of the spherical mirror (1) and the area of the cylindrical mirror (2) to form a multipass cell design scheme {spherical area, spherical curvature radius; cylindrical curvature radius, cylindrical area; relative distance, incident angle}.

7. The design method of the asymmetric sphero-cylindrical optical multipass cell according to claim 6, characterized in that, The optical aperture is located at the center of the spherical mirror (1) or the cylindrical mirror (2).

8. A design method for an asymmetric spherical-cylindrical optical multipass cell, characterized in that: Determine the curvature radius and area of the spherical mirror (1) and the curvature radius and area of the cylindrical mirror (2), arrange the two oppositely and coaxially, and adjust the relative distance between the two. Set an optical aperture on one of the mirrors, denote the mirror where the optical aperture is located as the incident mirror, and denote the other mirror as the retroreflector mirror. Determine the incident light equation in combination with the angle of the light aperture, and calculate the intersection point of the incident light equation and the retroreflector as the reflection point; Determine the return light equation after the incident light is reflected by the reflection point, and calculate the intersection point of the return light equation and the incident mirror as the latest reflection point; Determine the incident light equation after the return light is reflected by the reflection point, and calculate the intersection point of the incident light equation and the retroreflector as the latest reflection point; iterate until the number of light rays between the incident mirror and the retroreflector reaches the set value, then project the light spots on both reflectors onto the x-y plane to obtain the light spot pattern; Adjust the distance between the two reflectors and the incident angle of the light rays of the light aperture until a light spot pattern that meets the set conditions is obtained, and set an exit hole at the intersection point of the direction of the last light ray and the reflector.

9. The design method of the asymmetric spherical cylindrical optical multipass cell according to claim 8, characterized in that The set condition is: the uniformity of the light spots on the light spot pattern reaches the set value.

10. A design system for an asymmetric spherical-cylindrical optical multi-pass cell, characterized in that, It includes a memory and a processor. A computer program is stored in the memory. The processor is connected to the memory. The processor is used to execute the computer program to implement the design method of the asymmetric spherocylindrical optical multipass cell as described in any one of claims 4-9.

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