Reflector assembly, method, device and system for reducing light beam pointing temperature drift amount

Abstract

The invention discloses a reflector assembly, a method, a device and a system for reducing a light beam pointing temperature drift amount, and the thickness difference of an adhesive layer is converted into a controllable and preset design parameter from an uncontrollable random error through the introduction of an inclined bonding surface mirror seat. Therefore, when the ambient temperature changes, the reflector assembly can actively generate a pitch angle change opposite to the inherent temperature drift direction of the system by utilizing the characteristic that the thermal expansion coefficient of the ultraviolet glue is large, so that the autonomous, real-time and passive compensation of the light beam pointing drift is realized without depending on an external control system; and the stability of the optical system in a variable-temperature environment is greatly improved. The improved structure is simple, processing and manufacturing are convenient, cost is low, improvement and upgrading in an existing optical system and popularization and application of new products are facilitated, and the optical system has high cost performance and high practicability.

Description

Technical Field

[0001] This application relates to the field of mirror technology, and in particular to a mirror assembly, method, device, and system for reducing beam pointing temperature drift. Background Technology

[0002] In precision optical systems, such as optical experimental platforms and lasers, ensuring the stable propagation of light beams along a predetermined path and direction is crucial for the system to function. Achieving this goal relies on optical components consisting of optical elements (such as lenses and mirrors), mounts, and adhesives (such as UV adhesive) used to fix the components.

[0003] However, a long-standing unresolved problem exists in existing technologies: beam pointing drift occurs with changes in ambient temperature, known as temperature drift. This problem primarily stems from the following factors: First, unavoidable errors exist during the manufacturing and assembly of optical components and mounts, resulting in uneven thickness of the UV adhesive layer between the front and back of the optical components and the mount. Second, the coefficient of thermal expansion of the UV adhesive is much greater than that of the metal material of the mount. When the temperature changes, the expansion or contraction of the thicker side of the adhesive layer is greater than that of the thinner side, thus creating an unbalanced torque on the optical component, causing a slight pitch angle deflection. This angular change, amplified by the optical system, manifests as a significant drift in the output beam pointing direction, severely affecting the long-term stability and output accuracy of the system.

[0004] Therefore, overcoming thermally oriented drift caused by uneven adhesive layer thickness has become a pressing technical challenge in this field. Summary of the Invention

[0005] To address the aforementioned issues, this application provides a mirror assembly, method, device, and system for reducing beam pointing temperature drift.

[0006] The embodiments of this application disclose the following technical solutions: The first aspect of this application provides a mirror assembly for reducing beam pointing temperature drift, comprising: The reflector body is used to change the direction of light propagation; An adhesive layer is disposed between the inclined surfaces of the reflector body and the inclined bonding surface mirror mount; The inclined adhesive surface mirror holder has an inclined surface on its top for bonding the reflector body. The inclined surface is configured to be inclined relative to the optical axis of the reflector body, so that there is a thickness difference between the adhesive layer below the reflective surface of the reflector body and the adhesive layer on the back of the reflector body.

[0007] In one possible implementation, the inclined surface of the inclined bonding surface mirror mount is provided with three-sided barriers, which together with the inclined surface form an adhesive storage inclined groove. The adhesive layer is filled in the adhesive storage inclined groove. The three-sided barriers are used to restrict the flow of the adhesive along the inclined surface before it cures, so as to stably maintain the thickness difference of the ultraviolet adhesive layer below the reflective surface side and the back side of the reflector body.

[0008] In one possible implementation, the tilt angle of the tilted surface is determined by: The target beam pointing temperature drift compensation amount is obtained, where the target beam pointing temperature drift amount is the displacement variable of the beam spot coordinates caused by each degree Celsius temperature change. Based on the target beam pointing temperature drift compensation, optical path and the thermal expansion coefficient of the adhesive layer, the required target adhesive layer thickness difference between the reflective surface and the back surface of the reflector body is calculated. The tilt angle of the tilted surface is determined by geometric relationships based on the difference in thickness of the target adhesive layer and the thickness of the reflector body.

[0009] In one possible implementation, the inclination angle of the inclined surface is determined by the following formula: α = arctan(Δh / d) Where α is the tilt angle of the inclined surface, Δh is the thickness difference of the target adhesive layer, and d is the thickness of the reflector body.

[0010] In one possible implementation, the adhesive layer includes a UV adhesive layer, the UV adhesive layer being cured by UV light irradiation.

[0011] In one possible implementation, the reflector body is a plane reflector or a curved reflector.

[0012] A second aspect of this application provides a method for reducing beam pointing temperature drift, used in manufacturing a mirror assembly as described in the first aspect above, characterized in that the method includes: Measure the beam direction drift under temperature changes and record the target spot position coordinates at the reference temperature; Based on the beam pointing temperature drift, the thermal expansion coefficient of the adhesive, and the optical path, the required target adhesive layer thickness difference is calculated. Based on the target adhesive layer thickness difference, the reflector body is mounted on the inclined surface coated with adhesive, and the position of the reflector body is adjusted until the position coordinates of the light outlet spot at the reference temperature are consistent with the position coordinates of the target spot. While maintaining the position of the reflector body, the adhesive is cured.

[0013] In one possible implementation, adjusting the mirror body onto the inclined surface coated with adhesive based on the target adhesive layer thickness difference includes: Based on the target adhesive layer thickness difference, an online lens bonding fixture is used to mount and adjust the reflector onto the tilted bonding surface mirror mount. A third aspect of this application provides an optical device, including a mirror assembly as described in the first aspect above.

[0014] A fourth aspect of this application provides an optical system including a light source and an optical path, wherein at least one reflector assembly as described in the first aspect is disposed in the optical path.

[0015] Compared with the prior art, this application has the following advantages: This application introduces a custom-designed tilted adhesive surface mirror mount, transforming the thickness difference of the adhesive layer from an uncontrollable random error into a controllable, preset design parameter. This allows the mirror assembly to actively generate a pitch angle change opposite to the system's inherent temperature drift direction when the ambient temperature changes, utilizing the high thermal expansion coefficient of the UV adhesive. This achieves autonomous, real-time, and passive compensation for beam pointing drift without relying on an external control system, significantly improving the stability of the optical system in variable temperature environments. Furthermore, it eliminates the need for complex active temperature control elements, sensors, or additional adjustment mechanisms. The compensation function can be achieved simply by replacing the original flat adhesive surface mirror mount with the tilted adhesive surface mirror mount of this application. This modification is simple in structure, easy to manufacture, and inexpensive. It is also perfectly compatible with existing optical assembly processes (such as UV adhesive bonding), facilitating the upgrading and transformation of existing optical systems and the promotion and application of new products, possessing high cost-effectiveness and practicality. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of a flat bonding surface mirror mount bonding a reflector; Figure 2 This is a schematic diagram of the inclined adhesive surface mirror mount bonding reflector provided in the embodiments of this application; Figure 3 This is a schematic diagram of a glue storage inclined groove structure provided in an embodiment of this application; Figure 4 This is a schematic diagram of the tilt angle of an inclined adhesive surface provided in an embodiment of this application. Detailed Implementation

[0018] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present application.

[0019] To facilitate understanding of the technical solutions provided in the embodiments of this application, the background technology involved in the embodiments of this application will be described below.

[0020] As mentioned earlier, in precision applications such as optical experiments and lasers, one of the core tasks of an optical system is to ensure that the light beam can propagate stably along a predetermined path and direction. This function relies on optical components (such as lenses and mirrors), a mount, and UV adhesive used for fixation. However, in actual manufacturing and assembly, each component inevitably has processing errors. These minute errors accumulate during assembly, and combined with assembly deviations during the bonding of optical lenses to the mount, ultimately lead to inconsistencies in the thickness of the UV adhesive layer between the optical components and the mount.

[0021] When the ambient temperature changes, the various parts of an optical device made of different materials deform due to thermal expansion and contraction. Ultraviolet adhesive, as a polymer material, typically has a much higher coefficient of thermal expansion than the metal materials used in the mirror mount. If there is a difference in the thickness of the adhesive layer beneath the front and back of the mirror, the side with the thicker adhesive layer will experience greater absolute expansion and contraction due to the greater amount of material compared to the thinner side during temperature changes. This uneven deformation exerts an unbalanced torque on the mirror, causing a change in the mirror's pitch angle. Figure 1 As shown, Figure 1 This diagram illustrates the bonding of a reflector to a flat-mounted mirror. When the adhesive layer on the underside of the reflector is thicker than that on the backside, the increased temperature causes the adhesive layer on one side of the reflector to expand more significantly, pushing the reflector outward and causing a change in its perpendicularity. This minute change in angle, magnified by the optical system, manifests as a pitch drift in the direction of the emitted beam, also known as beam drift.

[0022] Specifically, the figure shows two bonding structures between the mirror and the mount: In the structure on the left, the mirror is bonded to the mount with a UV adhesive layer, and the adhesive layer below the reflecting surface is thicker than the adhesive layer on the back, exhibiting a significant thickness difference; the structure on the right is a comparison, with a uniform adhesive layer thickness (labeled 120μm). When the ambient temperature changes, the thermal expansion and contraction of the thicker adhesive layer below the reflecting surface is greater than that of the thinner adhesive layer on the back, which causes a change in the perpendicularity of the mirror. From the beam path perspective, after the incident light is horizontally incident on the mirror, the reflected light deviates from the ideal normal direction due to the change in the mirror's pitch angle. The figure clearly indicates that a 5μm change in adhesive layer thickness results in a 1250μm shift in the reflected light at a 1m optical path distance, meaning that a mere 5μm change in adhesive layer thickness causes a 1250μm shift in the beam at a 1m optical path distance (of which 625μm is a unidirectional shift). Figure 1 The complete causal chain of the difference in adhesive layer thickness → change in the tilt angle of the reflector → temperature drift in beam direction is clearly presented. The influence of temperature drift is quantified by specific values, and the principle of beam direction shift caused by thermal deformation of the adhesive layer in the optical system is intuitively explained.

[0023] In summary, current optical systems face three main challenges: First, the manufacturing processes of each component inherently contain errors. Second, process errors introduced during assembly and bonding further contribute to uneven adhesive layer thickness. Third, under varying temperature conditions, these errors combine to alter the orientation of optical elements, ultimately causing beam drift in the entire optical system with temperature changes. To address this challenge, the industry urgently needs a technical solution to effectively suppress beam drift due to temperature variations, keeping the system's beam drift at a low level. For example, the internationally recognized excellent pointing stability index for solid-state lasers is a beam drift of less than 20 microradians per degree Celsius change, thereby ensuring the long-term stability of the output beam of the optical system.

[0024] To address the aforementioned issues, this application embodiment measures the beam temperature drift at the light output port of the system and records the beam spot position at a reference temperature. Based on the thermal expansion coefficient and optical path length of the UV adhesive, the required adhesive layer thickness difference is calculated. Subsequently, a tilted adhesive surface mirror mount is replaced with a flat adhesive surface mirror mount to artificially create the preset adhesive layer thickness difference. Finally, an online bonding fixture is used for assembly and adjustment to ensure that the beam spot position at the reference temperature remains consistent with that before the modification. By actively creating a controllable adhesive layer thickness difference, the asymmetric deformation of the UV adhesive during temperature changes is compensated for, effectively suppressing beam pointing drift.

[0025] refer to Figure 2 , Figure 2 The schematic diagram of the inclined adhesive surface mirror mount and the reflector provided in the embodiments of this application is used to illustrate the core structural design of compensating for beam pointing temperature drift in this application. It presents a combined structure of inclined adhesive surface mirror mount + ultraviolet adhesive layer (adhesive layer) + reflector. The descriptions of each part are as follows: The tilted adhesive surface of the mirror mount is green, with a tilted adhesive surface at its top. This creates a controllable thickness difference in the UV adhesive layer beneath the front and back of the mirror, forming the structural basis for reverse pitch angle compensation. The adhesive layer is yellow and fills the space between the mirror and the tilted adhesive surface. Due to the tilt of the adhesive surface, its thickness distribution is uneven. When the ambient temperature changes, this adhesive layer, with its high coefficient of thermal expansion, undergoes asymmetrical thermal expansion and contraction, causing a change in the pitch angle of the mirror. The mirror itself is blue. Under the influence of the thermal deformation of the UV adhesive layer, the mirror produces a pitch angle change opposite to the direction of temperature drift of other optical components, thus offsetting or reducing the beam direction deviation.

[0026] It should be noted that the mirror assembly, method, device, and system for reducing beam pointing temperature drift provided in this application can be applied to the field of computer technology. The above are merely examples and do not limit the application areas of the mirror assembly, method, device, and system for reducing beam pointing temperature drift provided in this application.

[0027] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0028] The components provided in this application will be described below through an embodiment.

[0029] First, the principle of thermal expansion and contraction of UV adhesives will be explained. The core component of UV adhesives is a polymer, whose molecular structure has a unique cross-linked structure. This means that polymer molecular chains are connected by chemical bonds, forming a three-dimensional network structure. This structure is the fundamental reason for the thermal expansion and contraction characteristics of UV adhesives. Temperature changes directly alter the motion state of the polymer molecular chains, thus causing changes in the macroscopic thickness of the adhesive layer. When heated, the ambient temperature rises, the polymer molecular chains gain energy, and their motion increases. The originally tightly packed cross-linked structure is stretched, causing the adhesive layer to expand overall, increasing its thickness. When cooled, the ambient temperature decreases, the energy of the polymer molecular chains decreases, their motion decreases, the cross-linked structure contracts again, and the adhesive layer returns to a compact state, decreasing its thickness.

[0030] In optical systems, temperature drift caused by changes in ambient temperature primarily originates from the thermal deformation of optical components and supporting structures (including the UV adhesive layer). To compensate for this temperature drift, a compensation structure is designed utilizing the thermal expansion and contraction properties of the UV adhesive. Specifically, the position of the reflector in the optical system is replaced with a tilted adhesive-bonded reflector containing UV adhesive. This compensating reflector can produce a pitch angle change opposite to the temperature drift direction of other optical components when the ambient temperature changes, thereby offsetting or reducing the beam pointing deviation.

[0031] To clearly illustrate the quantitative relationship between the adhesive layer thickness and beam temperature drift in this scheme, a detailed theoretical calculation and analysis is conducted using the NOA61 UV adhesive as an example.

[0032] First, let's clarify the basic thermal parameters of the material: the coefficient of thermal expansion of NOA61 UV adhesive is 220 × 10⁻⁶. -6 / ℃, while the coefficient of thermal expansion of commonly used 304 stainless steel mirror mounts is 18×10. -6 / ℃. The ratio between the two is approximately 12.22:1, which means that under the same temperature change, the deformation of the UV adhesive is approximately 12.22 times that of stainless steel.

[0033] Based on this parameter, specific calculations are performed. When the initial thickness of the adhesive layer is 120 μm, the change in thickness for every 1°C change in temperature is 120 μm × 220 × 10. -6 / ℃ = 0.0264μm. This microscopic change in size will be amplified by the optical system through a leverage effect. According to the geometry shown in the attached figure, the change in adhesive layer thickness has a proportional relationship of 5:1250 with the pitch angle of the reflected beam.

[0034] In a typical scenario, assume the adhesive layer thickness below the reflecting surface of the mirror is 120 μm, and the adhesive layer thickness on the back is 0 μm, forming an initial thickness difference of 120 μm. When the temperature increases by 1 °C, the adhesive layer below the reflecting surface expands by 26.4 nm. Based on the ratio 5:1250=26.4:X, the spot offset of the reflected beam at a 1-meter optical path can be calculated to be 6.6 μm, corresponding to an angular drift of approximately 6.6 μrad.

[0035] If the thickness difference of the adhesive layer is increased to 240 μm, the beam offset will increase accordingly to 13.2 μrad, based on the linear relationship. However, this calculation does not take into account the thermal expansion effect of the tilted adhesive surface mirror mount itself. Since the coefficient of thermal expansion of 304 stainless steel is 1 / 12.22 of that of the UV adhesive, the thicker side of the tilted adhesive surface mirror mount expands more than the thinner side, and thermal deformation will partially offset the effect of adhesive layer expansion. After correction, the actual net offset is approximately 13.2 - (13.2 × 1 / 12.22) ≈ 12.12 μrad.

[0036] These calculation results demonstrate that by precisely controlling the thickness difference of the adhesive layer, the beam temperature drift can be quantitatively controlled, providing a reliable theoretical basis for the subsequent design of compensation structures.

[0037] The core design of this compensation device lies in the innovative improvement of the traditional flat bonding surface mirror mount into an inclined bonding surface mirror mount. This structural adjustment provides the fundamental physical conditions for achieving precise adhesive layer thickness differences. To ensure that the UV adhesive applied to the inclined surface maintains a preset distribution pattern and does not flow randomly before curing during the bonding process, a baffle structure is designed on three sides of the inclined surface, which together form a stable inclined adhesive storage groove. (See [link to relevant documentation]). Figure 3 , Figure 3 This is a schematic diagram of a glue storage inclined groove structure provided in an embodiment of this application.

[0038] Figure 3 The tilted slot design is not arbitrary; its tilt angle is precisely calculated based on the beam pointing compensation required by the optical system. To illustrate with a specific application example: suppose a laser experiences an upward temperature drift of 25 μrad when the ambient temperature increases by 1°C. According to the theoretical model established earlier, to generate a compensation of approximately 12.12 μrad in the opposite direction (downward), a difference in adhesive layer thickness of 240 micrometers is required. This compensation can reduce the system's total temperature drift from 25 μrad / °C to approximately 12.88 μrad / °C, a reduction of 50%, thus meeting the internationally accepted excellent beam pointing stability standard (<20 μrad / °C).

[0039] To achieve the specific 240-micron adhesive layer thickness difference, i.e., the target adhesive layer thickness difference in the current component, a precise tilt angle design is required. The reflector thickness is known to be 8 mm, and the required adhesive layer thickness difference is 240 μm. This geometric relationship can be abstracted as a right-angled triangle problem, where the lens thickness is one leg and the required adhesive layer thickness difference is the other leg. According to the definition of right-angled trigonometric functions, the tilt angle α can be calculated using the arctangent function, i.e., α = arctan(0.24 mm / 8 mm) ≈ 1.72°. Considering the precision of actual machining and ease of adjustment, the final tilt angle can be rounded to 1.5° or 2.0°, see [reference needed]. Figure 4 , Figure 4 This is a schematic diagram of the tilt angle of an inclined bonding surface provided in an embodiment of this application. This design ensures that the structural parameters of the compensation device can accurately meet the theoretical compensation requirements.

[0040] The installation and debugging in the embodiments are described below.

[0041] Step 1: System Characteristic Diagnosis and Benchmark Establishment. Before implementing compensation, the inherent temperature drift characteristics of the optical system must first be accurately quantified. At the final output port of the system, the target beam is determined, and the displacement of the beam position caused by each 1-degree Celsius temperature change is measured to determine the beam pointing temperature drift of the system. Simultaneously, the coordinates of the beam center at a stable ambient temperature (as the reference temperature) are recorded, establishing an indispensable reference benchmark for subsequent debugging.

[0042] Step 2: Theoretical calculation of compensation parameters. Based on the temperature drift data obtained in Step 1, combined with the specific thermal expansion coefficient of the selected UV adhesive and the beam path length at relevant locations in the system, the ideal adhesive layer thickness difference required to compensate for the inherent temperature drift of the system is calculated using a theoretical model. Thus, the optical performance index (temperature drift) is transformed into specific mechanical structural parameters (thickness difference).

[0043] Step 3: Installation of core compensation components. At the critical reflector location in the optical system's output path, a core structural modification is performed. The original flat adhesive-bonded mirror mount is removed and replaced with a pre-custom-made tilted adhesive-bonded mirror mount. The tilt angle of this specially designed mount is precisely to actively create a thickness difference in the adhesive layer between the reflecting surface and the back surface that closely approximates the theoretically calculated value after the reflector is installed, thus creating the necessary physical conditions for thermal compensation.

[0044] Step 4: Precision Assembly and Curing. This is the most delicate and crucial step in ensuring the compensation effect. Using an online lens bonding fixture, the mirror is assembled and bonded under a reference temperature environment. By monitoring the spot position at the system's output port in real time, the mirror's attitude on the tilting mount is finely adjusted until the spot coordinates perfectly coincide with the reference coordinates recorded in Step 1. This operation ensures that the compensation structure causes zero disturbance to the original optical path in its initial state. Subsequently, while maintaining this optimal state, the UV adhesive is cured to fix the mirror. At this point, an optical device capable of generating reverse compensation when the temperature changes is assembled, as shown in the schematic diagram of its final state. Figure 2 .

[0045] In one possible implementation, after the compensation device is installed and precisely debugged in the solid-state laser optical path system, it needs to be rigorously verified and systematically evaluated. The core task at this stage is to monitor and record the beam pointing changes of the optical system under different temperature conditions within a controlled temperature environment. By comparing and analyzing the temperature drift data before and after the implementation of the compensation measures, the actual compensation effect of the technology can be objectively quantified.

[0046] Experimental data show that after introducing the tilted adhesive surface mirror mount compensation scheme, the beam pointing stability of the optical system is significantly improved when the ambient temperature changes. Specifically, the beam pointing drift with temperature changes is greatly reduced, and the overall pointing stability parameters of the system are significantly improved. This result verifies the feasibility and effectiveness of the compensation method based on the principle of thermal expansion and contraction of UV adhesive.

[0047] Based on the measured results, key parameters of the compensation device, such as tilt angle design and adhesive layer thickness control, can be further optimized through feedback, thereby continuously improving compensation accuracy and system adaptability through iteration. This complete verification process not only confirms the engineering application value of this technical solution but also provides reliable experimental evidence and methodological guidance for its subsequent promotion and implementation in different types of optical systems.

[0048] Therefore, this application has the following beneficial effects: By utilizing the inherent thermal expansion and contraction properties of UV adhesives, this unstable factor is transformed into a source of compensation. Regardless of whether the ambient temperature rises or falls, the compensation mechanism can respond automatically and in real time, without the need for external energy drive or complex control systems. This achieves fully passive dynamic compensation, fundamentally improving the robustness of the optical system in variable temperature environments.

[0049] By precisely calculating and designing the tilt angle of the tilted adhesive mount, the thickness difference of the adhesive layer on the front and back of the mirror can be quantitatively controlled, thereby precisely customizing the required compensation amount. This design allows for flexible adjustments for different optical systems and different temperature drift characteristics, achieving precise matching from partial compensation to full compensation, and is highly versatile.

[0050] There is no need to introduce expensive active temperature control components, sensors, or complex feedback systems. The additional machining costs are extremely low and compatible with existing optical assembly processes. It can be completed using online lens bonding fixtures, which is very beneficial for upgrading existing products and promoting it in new products, offering extremely high cost-effectiveness.

[0051] Experimental verification shows that this method can significantly reduce beam pointing temperature drift and effectively improve system stability to an internationally advanced level, such as <20 μrad / ℃. This directly enhances the overall performance, reliability, and long-term stability of high-end equipment sensitive to temperature, such as lasers and precision optical measurement equipment. Furthermore, the principle of this application is universal and applicable not only to the aforementioned solid-state lasers, but also, with the maturation of the technology, it is expected to be widely applied and promoted in all optical fields with stringent requirements for beam pointing stability, such as optical communication, optical imaging, and remote sensing, thus possessing significant industry value.

[0052] It should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the systems or apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the descriptions are relatively simple, and relevant parts can be referred to the method section.

[0053] It should be understood that in this application, "at least one" refers to one or more items, and "more" refers to two or more items. "And / or" is used to describe the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: only A exists, only B exists, and both A and B exist simultaneously, where A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "At least one" or similar expressions refer to any combination of these items, including any combination of singular or plural items. For example, "at least one" of a, b, or c can represent: a, b, c, a and b, a and c, b and c, or a and b and c, where a, b, and c can be single or multiple.

[0054] It should be understood that the terms center, longitudinal, transverse, up, down, front, back, left, right, vertical, horizontal, top, bottom, inside, outside, etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the present 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 the present invention.

[0055] It should be noted that, unless otherwise explicitly specified and limited, the terms installation, connection, and linking should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0056] It should also be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the statement "comprising a..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0057] The steps of the methods or algorithms described in conjunction with the embodiments disclosed herein can be implemented directly by hardware, a software module executed by a processor, or a combination of both. The software module can be located in random access memory (RAM), main memory, read-only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, removable disk, CD-ROM, or any other form of storage medium known in the art.

[0058] The above description of the disclosed embodiments enables those skilled in the art to make or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A reflector assembly for reducing beam pointing temperature drift, characterized in that, include: The reflector body is used to change the direction of light propagation; An adhesive layer is disposed between the inclined surfaces of the reflector body and the inclined bonding surface mirror mount; The inclined adhesive surface mirror holder has an inclined surface on its top for bonding the reflector body. The inclined surface is configured to be inclined relative to the optical axis of the reflector body, so that there is a thickness difference between the adhesive layer below the reflective surface of the reflector body and the adhesive layer on the back of the reflector body.

2. The reflector assembly according to claim 1, characterized in that, The inclined surface of the inclined bonding surface mirror mount is provided with three-sided enclosures. The three-sided enclosures and the inclined surface together form an adhesive storage inclined groove. The adhesive layer is filled in the adhesive storage inclined groove. The three-sided enclosures are used to restrict the flow of adhesive along the inclined surface before curing, so as to stably maintain the thickness difference of the ultraviolet adhesive layer below the reflective surface side and the back side of the reflector body.

3. The reflector assembly according to claim 1, characterized in that, The method for determining the tilt angle of the tilted surface includes: The target beam pointing temperature drift compensation amount is obtained, which is the displacement variable of the beam spot coordinate caused by each degree Celsius temperature change. Based on the target beam pointing temperature drift compensation, optical path and the thermal expansion coefficient of the adhesive layer, the required target adhesive layer thickness difference between the reflective surface and the back surface of the reflector body is calculated. The tilt angle of the tilted surface is determined by geometric relationships based on the difference in thickness of the target adhesive layer and the thickness of the reflector body.

4. The reflector assembly according to claim 3, characterized in that, The inclination angle of the inclined surface is determined by the following formula: α = arctan(Δh / d); Where α is the tilt angle of the inclined surface, Δh is the thickness difference of the target adhesive layer, and d is the thickness of the reflector body.

5. The reflector assembly according to claim 1, characterized in that, The adhesive layer includes a UV adhesive layer, and the UV adhesive layer is cured by UV light irradiation.

6. The reflector assembly according to claim 1, characterized in that, The reflector body is a plane reflector or a curved reflector.

7. A method for reducing beam pointing temperature drift, used in manufacturing a mirror assembly as described in any one of claims 1 to 6, characterized in that, The method includes: Measure the beam direction drift under temperature changes and record the target spot position coordinates at the reference temperature; Based on the beam pointing temperature drift, the thermal expansion coefficient of the adhesive, and the optical path, the required target adhesive layer thickness difference is calculated. Based on the target adhesive layer thickness difference, the reflector body is mounted on the inclined surface coated with adhesive, and the position of the reflector body is adjusted until the position coordinates of the light outlet spot at the reference temperature are consistent with the position coordinates of the target spot. While maintaining the position of the reflector body, the adhesive is cured.

8. The method according to claim 7, characterized in that, The step of mounting the mirror body onto the inclined surface coated with adhesive based on the target adhesive layer thickness difference includes: Based on the target adhesive layer thickness difference, the reflector is mounted onto the inclined adhesive surface mirror mount using an online lens bonding fixture.

9. An optical device comprising a mirror assembly for reducing beam pointing temperature drift as described in any one of claims 1 to 6.

10. An optical system, comprising a light source and an optical path, characterized in that, The optical path is provided with at least one reflector assembly as described in any one of claims 1 to 6.

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