Aspheric lens and device for monitoring suspension optical power voltage

Abstract

The invention discloses an aspheric lens for monitoring suspension optical power voltage, relates to the technical field of vacuum optical tweezers systems, and is used for solving the problem that a lens capable of stably working in a vacuum and high-voltage electric field environment is lacked in the prior art, specifically, the lens is of a single plano-convex structure and comprises an incident plane and an emergent plane, the incident plane is a convex aspheric surface, the emergent plane is a plane, and the working wavelength of the lens is 1064nm. The invention further discloses a device for monitoring the suspension light power voltage. According to the invention, the lens with a single plano-convex structure is designed under the condition of the wavelength of 1064nm, so that stable work in vacuum and high-voltage electric field environments is realized.

Description

Technical Field

[0001] This invention relates to the field of vacuum optical tweezers systems, and more particularly to an aspherical lens and device for monitoring suspended optical force and voltage. Background Technology

[0002] Vacuum optical tweezers is an optical system that uses optical radiation to suspend and manipulate micro- and nano-particles in a vacuum environment. By isolating micro- and nano-particles from the external environment under high vacuum conditions, the system can effectively eliminate interference factors such as air damping, thermal noise, and mechanical vibration, thereby achieving extremely high detection sensitivity.

[0003] In vacuum optical tweezers systems, a laser beam, after being focused by a high numerical aperture (NAP) capturing objective, forms a stable three-dimensional optical potential trap to capture and confine nano- or micron-sized particles. The stability and focusing capability of the potential trap directly determine the system's capture efficiency, cooling efficiency, and ultimately achievable vacuum level. To achieve a strong focused optical field, the NAP of the capturing objective is typically required to be greater than 0.7. In existing systems, researchers commonly use commercially available high-magnification microscope objectives as focusing elements. While these objectives can achieve good aberration correction at larger NAPs, their design is primarily geared towards microscopic imaging applications, rather than vacuum or high-voltage electric field environments. This presents numerous limitations in optical tweezers systems, necessitating a more stable aspherical lens solution that can operate stably in both vacuum and high-voltage electric field environments. Summary of the Invention

[0004] To overcome the shortcomings of the prior art, one of the objectives of this invention is to provide an aspherical lens for monitoring the levitation photoelectric voltage, which achieves high NA focusing under conditions of small incident light spot through the design of an aspherical plano-convex single lens.

[0005] One of the objectives of this invention is achieved through the following technical solution: An aspherical lens for monitoring suspended optical power voltage, the lens is a monolithic plano-convex structure including an incident surface and an exit surface, the incident surface is a convex aspherical surface, the exit surface is a planar surface, and the working wavelength of the lens is 1064nm.

[0006] To achieve high focusing performance within a small volume, the aperture diameter D ≤ 5mm, the numerical aperture NA ≥ 0.7, and the focal length... f ≤4mm; the wavelet aberration RMS of the lens is <λ / 14, where λ is the working wavelength.

[0007] To ensure excellent thermal stability, vacuum resistance, and electrical insulation performance, the lens is made of glass and has a refractive index greater than 1.7.

[0008] The equation of the convex aspherical surface of the lens satisfies: , in, It indicates verticality. The curvature of the reference or auxiliary sphere of an aspherical surface. The taper coefficient is... = A4~A16 , representing aspherical coefficients of orders 4 to 16 respectively. This represents the highest order of the aspherical coefficients. It represents the radial distance from a point on the lens surface to the optical axis.

[0009] The convex aspherical surface of the lens satisfies: , , , , in, This represents the ratio of focal length to aperture diameter. Indicates the center thickness of an aspherical lens. It is the first derivative of the surface elevation of the aspherical surface. It represents the second derivative of the sag of the aspherical surface.

[0010] Both surfaces of the lens are coated with a 1064nm antireflection film. The antireflection film has a reflectivity of ≤0.2% and a transmittance of ≥99% in the 1064nm band, in order to reduce energy loss and improve the intensity of focused light.

[0011] Furthermore, the lens is used in a vacuum optical tweezers system to capture and suspend micro- and nano-particles in a vacuum environment.

[0012] To avoid subsurface damage that may be introduced by traditional polishing and to achieve high-precision, high-consistency mass production, the lens is integrally formed by precision glass molding.

[0013] Furthermore, the lens can form a three-dimensional tightly focused optical potential trap after focusing, thereby improving the capture efficiency and cooling efficiency of micro and nano particles.

[0014] The second objective of this invention is to provide a device for monitoring the voltage of suspended light.

[0015] The second objective of this invention is achieved by the following technical solution: A device for monitoring the levitation optical voltage, comprising: Vacuum cavity; As described above, an aspherical lens is mounted on the vacuum cavity to form an optical potential well within the vacuum cavity to capture particles; A detection module for detecting the scattered light from the particles; The signal processing unit determines the electric field strength based on the signal from the detection module.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention achieves high-performance optical capture in extreme environments through the design of a small-diameter, high-numerical-aperture aspherical plano-convex single lens. It also enables high-NA focusing under conditions of small incident light spots, thereby forming a three-dimensional tightly focused beam within a limited space and effectively improving the gradient force intensity and optical field confinement capability of the optical trap. This characteristic allows the vacuum optical tweezers system to maintain high capture efficiency even in environments with limited volume or optical path conditions. This invention solves the problem that traditional commercial microscope objectives cannot operate stably in ultra-high vacuum and high-voltage electric field environments.

[0017] Furthermore, the aspherical lens of this invention achieves a balance between miniaturization, integration, and high performance, and can form a light spot close to the diffraction limit. At the same time, it enables the miniaturization of the optical head of the entire suspended optical force sensing system, laying the foundation for portable and array-based deployment of the device.

[0018] Furthermore, this invention adopts an integrated structure that is all glass, metal-free, and adhesive-free, physically eliminating the vacuum venting source and high-voltage discharge point, ensuring that the system can obtain and maintain an ultra-high vacuum, thereby significantly reducing gas damping and thermal noise, achieving higher precision particle displacement detection, and ensuring the long-term stability and measurement accuracy of the system. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the aspherical lens in Embodiment 1; Figure 2 This is a schematic diagram of the capture and detection optical path in the vacuum optical tweezers system of Example 2; Figure 3 This is a graph showing the root mean square value of wave aberration under different fields of view in Example 3; Figure 4 This is a graph showing the root mean square value of wave aberration under different fields of view in Example 3; Figure 5 This is a graph showing the root mean square value of wave aberration under different fields of view in Example 3. Detailed Implementation

[0020] The present invention will now be described in more detail with reference to the accompanying drawings. It should be noted that the following description of the present invention with reference to the accompanying drawings is merely illustrative and not restrictive. Various embodiments can be combined with each other to form other embodiments not shown in the following description.

[0021] Example 1 Example 1 provides an aspherical lens for levitation optical voltage monitoring. It aims to enable the application of high-sensitivity levitation optical sensing technology in high-voltage power grid monitoring by adopting an all-glass, metal-free integrated plano-convex structure and combining it with a high-transmittance coating optimized for 1064nm laser wavelength.

[0022] Microscope objectives typically employ multiple lenses (commonly more than 10) to correct monochromatic and chromatic aberrations. These lenses are complex, bulky, and heavy, resulting in high manufacturing and assembly costs, and limited transmittance. This complex optical structure not only hinders the miniaturization and integration of vacuum optical tweezers systems but also limits their long-term stable operation under ultra-high vacuum conditions due to the adhesives, glues, or greases used internally. Furthermore, in strong electric field environments such as high-voltage power grid monitoring, the metal structures within the objectives can cause electric field distortion, severely affecting the measurement accuracy and safety of levitated optical force detection systems. Therefore, traditional commercial microscope objectives are difficult to directly apply to vacuum optical tweezers systems under high-voltage electric fields.

[0023] In contrast, aspherical lenses can effectively eliminate spherical aberration caused by spherical lenses by adjusting the surface constant and aspherical coefficient, thus significantly simplifying the optical system structure while maintaining excellent focusing performance.

[0024] Currently available small-aperture, high-numerical-aperture aspherical lenses are primarily designed for the 830 nm or 1550 nm wavelength bands, with typical applications including laser diode collimation and fiber coupling. However, in vacuum optical tweezers systems, a 1064 nm laser is commonly used as the capture source. Existing commercial lenses are not compatible with this wavelength, easily leading to focused spot diffusion and reduced light intensity, thereby decreasing particle capture efficiency, stability, and cooling performance.

[0025] Specifically, traditional vacuum optical tweezers systems typically require a large incident light spot and a complex optical path system to achieve high numerical aperture (NA) focusing. This embodiment achieves high NA focusing with a small incident light spot by designing a small-diameter, large numerical aperture aspherical plano-convex single lens. This enables the formation of a three-dimensional tightly focused beam within a limited space, effectively improving the gradient force intensity and optical field confinement capability of the optical trap. This characteristic allows the vacuum optical tweezers system to maintain high capture efficiency even in environments with limited volume or optical path conditions.

[0026] The aspherical plano-convex single lens in this embodiment employs an optimized aspherical curvature design, reducing the system's performance sensitivity to manufacturing tolerances. Compared to multi-element compound microscope objectives, which have high requirements for center deviation, thickness error, and assembly precision, this invention features a simple structure, centralized parameter control, and can achieve highly consistent manufacturing through precision glass molding (PGM) technology. This process is suitable for mass production and offers advantages such as low cost, good repeatability, and high yield, providing a feasible path for the large-scale manufacturing and promotion of vacuum optical tweezers systems.

[0027] Compared to traditional multi-element microscope objectives, the aspherical plano-convex single lens in this embodiment achieves high-quality focusing using only a single optical element, significantly reducing the size and weight of the acquisition optics module. By employing high-refractive-index glass material and combining it with a high-transmittance anti-reflection coating, the lens maintains high light transmittance while reducing internal reflection and absorption losses. This characteristic not only reduces system hardware costs but also improves the light acquisition efficiency, cooling efficiency, and vacuum level of the vacuum optical tweezers system, contributing to enhanced stability and anti-interference capabilities of the entire system during long-term operation.

[0028] Furthermore, this embodiment employs an all-glass structure and a metal-free encapsulation design, possessing excellent electrical insulation and vacuum compatibility. It can operate stably in high-voltage electric field environments, avoiding the electric field distortion problems caused by traditional metal-structured lenses. This characteristic makes the lens of this embodiment particularly suitable for scenarios requiring high-precision optical manipulation in strong electric fields, such as levitation optical force and voltage monitoring.

[0029] In summary, the lens in this embodiment targets the 1064nm wavelength band, combining a small aperture with a large numerical aperture, and can operate stably in vacuum and high-voltage electric field environments. It provides a simple, high-performance, and mass-producible small-aperture, high-numerical-aperture aspherical lens for vacuum optical tweezers electric field sensing systems.

[0030] Based on the above principles, please refer to Figure 1 As shown in the figure, the letters O, A, and B represent tangents to the aspherical surface to facilitate understanding of the lens. This embodiment provides an aspherical lens suitable for monitoring the levitation optical voltage in the 1064 nm band. The incident surface of this aspherical lens is convex, facing the incident light, and the exit surface is a plano-convex aspherical lens. The lens is a monolithic plano-convex structure, including an incident surface and an exit surface. The incident surface is a convex aspherical surface, and the exit surface is a plane. The working wavelength of the lens is 1064 nm.

[0031] To ensure the capture of nanoparticles, the lens in this embodiment has a light-transmitting aperture D ≤ 5 mm, enabling miniaturization and facilitating system integration; a numerical aperture NA ≥ 0.7 ensures a high-gradient optical trap with strong capture force and high stability; a focal length f ≤ 4 mm results in a compact structure and suitable working distance; the root mean square (RMS) wavefront aberration of the geometric spot size formed by focusing the collimated laser light through the lens is less than λ / 14 within a 0.5° field of view, where λ is the working wavelength. The RMS of the lens's wavefront aberration < λ / 14 ensures concentrated spot energy and a high signal-to-noise ratio. Here, the numerical aperture NA refers to the sine of the angle between the edge rays and the optical axis after convergence by the lens, i.e., sinθ. The light-transmitting aperture D is the diameter of the laser beam passing through the lens.

[0032] To achieve better thermal stability, a lower coefficient of thermal expansion, and a higher laser damage threshold, making the lens suitable for vacuum and laser irradiation environments, the aspherical single lens in this embodiment is made of glass instead of plastic and is formed using glass molding technology. The lens has a refractive index greater than 1.7, providing stronger optical power at the same curvature, which is beneficial for achieving a large aperture (NA) with a small aperture. The expression for the aspherical surface in this embodiment is as follows: , in, This represents the perpendicularity, specifically the incident height of the light ray from the tangent of the refracting surface at the origin to the lens surface. h The distance between points along the optical axis, The curvature of the reference or auxiliary sphere of an aspherical surface. c =1 / r for, r Let be the radius of curvature. The taper coefficient is... = A4~A16 , representing aspherical coefficients of orders 4 to 16 respectively. This represents the highest order of the aspherical coefficients. It represents the radial distance from a point on the lens surface to the optical axis.

[0033] To ensure the smoothness and rationality of the aspherical shape and avoid anomalous curved surfaces that are difficult to process or degrade image quality, the convex aspherical surface of the lens must satisfy the following: , , , , in, This represents the ratio of focal length to aperture diameter. Indicates the center thickness of an aspherical lens. It is the first derivative of the surface elevation of the aspherical surface. It represents the second derivative of the sag of the aspherical surface.

[0034] The lens in this embodiment is used in a vacuum optical tweezers system to capture and suspend micro- and nano-particles in a vacuum environment.

[0035] More specifically, the incident surface of the aspherical single lens is an aspherical surface with positive optical power, while the exit surface is a plane. The numerical aperture of aspherical single lens 1 is 0.7 or greater. After collimated laser light passes through aspherical single lens 1, its geometrically diffused spot is smaller than the diffraction limit. The plano-convex design of the aspherical surface reduces manufacturing difficulty, reduces the tolerance sensitivity of inter-lens eccentricity, and maintains the focusing effect of the lens. Secondly, the plane of the aspherical surface serves as a reference surface, which is beneficial for the positioning and fixation of the aspherical lens. When a watt-level laser irradiates the lens, the lens material absorbs energy, causing its temperature to rise. Coupled with the vacuum working environment, heat dissipation is difficult. Considering factors such as refractive index, aspherical single lens 1 uses a high-refractive-index glass material. Compared with plastic materials, glass materials have better stability and less bubble formation, which is beneficial for improving the vacuum level. Aspherical glass lenses are often made using CNC polishing or molding techniques to achieve the aspherical surface. CNC polishing is usually used for processing aspherical lenses with a diameter of 10mm or more, and therefore is not suitable for miniaturized applications. Molding technology involves placing softened glass into a high-precision mold and directly molding it into an optical component that meets the required specifications under heat, pressure, and an oxygen-free environment in a single step. Using glass materials with high refractive indices allows for a larger lens surface radius, and edge rays can be incident on the aspherical lens at a smaller angle, which is more advantageous for lens processing and anti-reflective coating design. Both the aspherical surface and the planar surface of the aspherical single lens are coated with an anti-reflective coating that provides high transmission up to 1064nm.

[0036] In summary, this embodiment provides a small-diameter, high numerical aperture aspherical plano-convex single-lens structure specifically designed for vacuum optical tweezers systems. The first surface (light incident surface) of the lens is a convex aspherical surface with positive optical power, used to achieve high numerical aperture focusing; the second surface (light exit surface) is a planar structure to simplify installation and collimation design. Both surfaces of the lens are coated with a high-transmittance antireflection film, achieving low reflection (reflectivity ≤0.2%) and high transmittance (transmittance ≥99%) in the 1064 nm wavelength band, thereby reducing energy loss and increasing the intensity of the focused light.

[0037] The aspherical single lens in this embodiment operates at a wavelength of 1064 nm, with an aperture diameter (D) ≤ 5 mm, a numerical aperture (NA) ≥ 0.7, and a focal length (f) ≤ 4 mm. In the simulation, the lens, after focusing the collimated laser, has a geometric spot size smaller than the diffraction limit and a root mean square wavelet aberration (RMS) less than λ / 14, achieving high focusing performance within a small volume. This optical parameter configuration enables the stable formation of a high-intensity three-dimensional optical potential trap in a high-vacuum environment, achieving efficient capture and long-term stable suspension of nanoparticles.

[0038] Furthermore, the aspherical single lens in this embodiment uses a high-refractive-index glass material (refractive index n>1.7) instead of plastic or resin materials to ensure excellent thermal stability, vacuum resistance, and electrical insulation properties. The lens employs Precision Glass Molding (PGM) technology to achieve high-precision aspherical forming and low-cost mass production. This process avoids surface stress and shape errors generated in traditional grinding and polishing, helping to maintain the consistency of the lens's optical performance.

[0039] Example 2 Example 2 is a system utilizing the lens described in Example 1.

[0040] A device for monitoring the voltage of levitation light, comprising: Vacuum cavity; The aspherical lens described in Embodiment 1 is mounted on the vacuum cavity to form an optical potential well within the vacuum cavity to capture particles. A detection module for detecting the scattered light from the particles; The signal processing unit determines the electric field strength based on the signal from the detection module.

[0041] Please refer to Figure 2 The diagram shows the schematic of the acquisition and detection optical path in a typical vacuum optical tweezers system. In the diagram, 1 is an aspherical single lens, 2 is a micro / nano particle, 3 is a collecting lens, 4 is a half-wave plate, 5 is a polarizing beam splitter, 6 is a converging lens, 7 is a quadrant detector, 8 is an absorption tube, and 9 is a vacuum cavity. The detection module corresponds to the collecting lens 3, half-wave plate 4, polarizing beam splitter 5, converging lens 6, and quadrant detector 7, along with their optical path connections. The signal processing unit is a conventional processing module and will not be described in detail in this embodiment.

[0042] Specifically, a linearly polarized laser beam enters the vacuum cavity 9 through a glass window. An aspherical single lens 1 is fixed to its clamping structure. The laser beam is a Gaussian beam with good symmetry. By adjusting the incident direction of the laser beam through an external adjustment mechanism, the laser beam can be orthogonally incident through the aspherical single lens 1. This creates a tightly focused optical trap that also possesses high symmetry, greatly improving the stability of the optical trap. This is crucial for increasing the capture probability and for motion cooling under high vacuum. The diameter of the laser beam is slightly larger than the aperture of the aspherical single lens 1, so that the focusing capability of the aspherical single lens 1 can be fully utilized to achieve the predetermined numerical aperture. After the optical trap captures the micro / nano particles 2, both the scattered light from the particles and the laser light that does not pass through the particles are collimated by the collecting lens 3 and transmitted out of the vacuum cavity 9. The outgoing collimated light passes through a half-wave plate 4. Rotating the half-wave plate 4 changes the linear polarization direction of the collimated light. The polarization beam splitter 5 separates the p-beam and s-beam. Therefore, by combining the half-wave plate 4 and the polarization beam splitter 5, the light intensity can be adjusted. By controlling the power intensity of the light emitted from the polarization beam splitter 5, damage to the four-quadrant detector 7 due to excessive power is avoided. Collimated light with a specific polarization direction is filtered and transmitted through the polarization beam splitter 5, while other light is reflected into the light-absorbing tube 8. The outgoing collimated light is focused onto the four-quadrant detector 7 by the converging lens 6. The four-quadrant detector 7 is placed at a certain distance behind the focal point of the converging lens 6, and the light spot must be uniformly illuminating the four quadrants of the four-quadrant detector 7. The four-quadrant detector 7 converts the collected light into an electrical signal for subsequent processing.

[0043] Example 3 Example 3 is an illustration of a specific aspherical lens as described in Example 1.

[0044] The operating wavelength of this embodiment is 1064 nm, and the numerical aperture NA = 0.705. The parameters of the aspherical single lens are shown in Tables 1.1 and 1.2.

[0045] Table 1.1

[0046] Table 1.2

[0047] The refractive surface 2 of this lens is the aspherical surface, and the refractive surface 3 is a plane. The radius of curvature of the refractive surface 2 is positive and infinite, satisfying the requirements of a plano-convex lens. Here, the focal length f = 3.18mm ≤ 4mm, the aperture D = 4.5 ≤ 5mm, 0.5 ≤ F = 0.706 ≤ 0.75, and 0.6 ≤ f / t = 1 ≤ 1.2 all satisfy the ranges of Example 1.

[0048] Please refer to Table 1.3.

[0049] Table 1.3

[0050] The surface slope of the aspherical surface The value is between -1.1 and 1.1, and the second derivative is... The value is between 0.4 and 0.65, satisfying -1.7 ≤ ≤1.7, 0.3≤ ≤3. Please refer to Figure 3 The root mean square wavefront difference shown in the different fields of view can be seen to be lower than λ / 14 within a 0.7-degree field of view.

[0051] This embodiment also provides parameters for an aspherical lens.

[0052] Please refer to Tables 2.1 and 2.2 for aspherical lenses with a numerical aperture NA=0.8.

[0053] Table 2.1

[0054] Table 2.2

[0055] The refractive surface 2 of this lens is the aspherical surface, and the refractive surface 3 is a plane. The radius of curvature of the refractive surface 2 is positive and infinite, satisfying the requirements of a plano-convex lens. Here, the focal length f = 1.83mm ≤ 4mm, the aperture D = 3mm ≤ 5mm, 0.5 ≤ F = 0.61 ≤ 0.75, and 0.6 ≤ f / t = 0.9 ≤ 1.2 all satisfy the parameter description of Example 1.

[0056] Please refer to Table 2.3.

[0057] Table 2.3

[0058] The surface slope of the aspherical surface The value is between -1.4 and 1.4, and the value of the second derivative d²z / dh² is between 0.6 and 1.2, satisfying -1.7 ≤ ≤1.7, 0.3≤ ≤3. Figure 4 The root mean square wavefront difference of the third embodiment under different fields of view can be seen to be lower than λ / 14 within a 1-degree field of view.

[0059] This embodiment also provides parameters for an aspherical lens.

[0060] Please refer to the aspherical lenses with numerical aperture NA=0.8 shown in Tables 3.1, 3.2 and 3.3.

[0061] Table 3.1

[0062] Table 3.2

[0063] Table 3.3

[0064] The refractive surface 2 of this lens is the aspherical surface, and the refractive surface 3 is a plane. The radius of curvature of the refractive surface 2 is positive and infinite, satisfying the requirements of a plano-convex lens. Here, the focal length f = 0.74mm ≤ 4mm, the aperture diameter D = 1.2mm ≤ 5mm, 0.5 ≤ F = 0.617 ≤ 0.75, and 0.6 ≤ f / t = 0.74 ≤ 1.2 all satisfy the claims. Figure 5 The root mean square wavefront difference of the second embodiment under different fields of view can be seen to be lower than λ / 14 within a 0.55-degree field of view.

[0065] The surface slope of the aspherical surface The value is between -1.2 and 1.2, the second derivative. The value is between 1.5 and 2.3, satisfying -1.7 ≤ ≤1.7, 0.3≤ ≤3.

[0066] For those skilled in the art, various other corresponding changes and modifications can be made based on the technical solutions and concepts described above, and all such changes and modifications should fall within the protection scope of the claims of this invention.

Claims

1. An aspherical lens for monitoring levitation optical force and voltage, characterized in that, The lens is a single plano-convex structure, including an incident surface and an exit surface. The incident surface is a convex aspherical surface, and the exit surface is a plane. The working wavelength of the lens is 1064nm.

2. The aspherical lens for monitoring levitation photoelectric voltage as described in claim 1, characterized in that, Light-transmitting aperture D≤5mm, numerical aperture NA≥0.7, focal length f ≤4mm; the wavelet aberration RMS of the lens is <λ / 14, where λ is the working wavelength.

3. The aspherical lens for monitoring levitation photoelectric voltage as described in claim 1, characterized in that, The lens is a glass lens with a refractive index greater than 1.

7.

4. The aspherical lens for monitoring levitation photoelectric voltage as described in claim 1, characterized in that, The equation of the convex aspherical surface of the lens satisfies: ， in, It indicates verticality. The curvature of the reference or auxiliary sphere of an aspherical surface. The taper coefficient, = A4~ A16 , representing aspherical coefficients of orders 4 to 16 respectively. This represents the highest order of the aspherical coefficients. It represents the radial distance from a point on the lens surface to the optical axis.

5. The aspherical lens for monitoring levitation photoelectric voltage as described in claim 1 or 4, characterized in that, The convex aspherical surface of the lens satisfies: ， ， ， ， in, This represents the ratio of focal length to aperture diameter. Indicates the center thickness of an aspherical lens. It is the first derivative of the surface elevation of the aspherical surface. It represents the second derivative of the sag of the aspherical surface.

6. The aspherical lens for monitoring levitation optical force and voltage as described in claim 1, characterized in that, Both surfaces of the lens are coated with a 1064nm antireflection film, which has a reflectivity of ≤0.2% and a transmittance of ≥99% in the 1064nm band.

7. The aspherical lens for monitoring levitation optical force and voltage as described in claim 1, characterized in that, The lens is used in a vacuum optical tweezers system to capture and suspend micro- and nano-particles in a vacuum environment.

8. The aspherical lens for monitoring levitation photoelectric voltage as described in claim 3, characterized in that, The lens is integrally formed by precision glass molding.

9. The aspherical lens for monitoring levitation optical force and voltage as described in claim 1, characterized in that, The lens, once focused, can form a three-dimensional tightly focused optical potential trap, improving the capture and cooling efficiency of micro and nano particles.

10. A device for monitoring the voltage of suspended light, characterized in that, include: Vacuum cavity; The aspherical lens as described in any one of claims 1-9 is mounted on the vacuum cavity to form an optical potential well within the vacuum cavity to capture particles; A detection module for detecting the scattered light from the particles; The signal processing unit determines the electric field strength based on the signal from the detection module.

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