Wide spectrum type confocal collimator

Abstract

The utility model provides a wide-spectrum confocal collimator. The wide-spectrum confocal collimator comprises a collimator main body shell, an optical fiber connector, an achromatic lens and a compensating mirror, one end of the collimator main body shell is connected with an optical fiber connector, one end, far away from the optical fiber connector, in the collimator main body shell is provided with a group of achromatic lenses and a compensating mirror which are sequentially arranged along the direction of an optical path, and an air gap is reserved between the compensating mirror and the achromatic lenses; the optical fiber connector is connected with an optical fiber and can enable the end face of the optical fiber to coincide with the focus of the achromatic lens in the collimator main body shell after being connected with the collimator main body shell. The achromatic lens and the compensating mirror are adopted as optical components in the collimator body shell, chromatic aberration can be reduced and light beam collimation can be optimized through the achromatic lens, the light beam is further accurately adjusted through the compensating mirror, and it is ensured that the finally output light beam has high-quality collimation and stability.

Description

Technical Field

[0001] The present application relates to the technical field of collimators, and in particular to a wide-spectrum confocal collimator. Background Art

[0002] Confocal optical systems have been widely used in fields such as optical microscopes, optical detection instruments, and optical fiber communications. A key component of a confocal optical system is a collimator, whose function is to collimate the light beam emitted by a light source into a parallel beam, or to focus the parallel beam onto a specific position of a detector or an optical fiber.

[0003] Optical fiber collimators are mainly applied in the field of optical fiber communications. Most traditional optical fiber collimators use a single spherical lens to collimate the light beam. Its structure is simple and it is widely used in the field of optical communications. Traditional optical fiber collimators have insufficient chromatic aberration correction in a wide spectral range, resulting in unstable beam collimation and affecting the communication quality. Therefore, traditional optical fiber collimators are usually only suitable for the transmission of optical signals under a narrow spectrum. Since significant chromatic aberration is likely to occur under a wide spectrum, thus affecting the collimation performance, it is necessary to improve the existing optical fiber collimators. Currently, with the rapid development of fields such as sensing and medical treatment, optical fiber collimators are facing the need to achieve beam collimation in a wide spectral range. Summary of the Utility Model

[0004] The present application provides a wide-spectrum confocal collimator to solve the problem that the existing optical fiber collimator is prone to significant chromatic aberration under a wide spectrum, thus affecting the collimation performance.

[0005] To solve the above technical problems, the present application adopts the following technical solutions:

[0006] A wide-spectrum confocal collimator includes a collimator main body housing, an optical fiber connector, an achromatic lens, and a compensating mirror;

[0007] One end of the collimator main body housing is connected with the optical fiber connector. One end of the collimator main body housing far from the optical fiber connector is provided with a group of the achromatic lenses and a compensating mirror arranged in sequence along the optical path direction. An air gap is left between the compensating mirror and the achromatic lens. The optical fiber connector is connected with an optical fiber and can make the end face of the optical fiber coincide with the focal point of the achromatic lens in the collimator main body housing after being connected with the collimator main body housing.

[0008] In an optional embodiment, the achromatic lens includes a negative lens and a positive lens arranged in sequence along the optical path direction. The positive lens is arranged on the rear side of the optical path of the negative lens. The negative lens and the positive lens are glued together. The compensating mirror is located behind the achromatic lens in the optical path.

[0009] In an alternative embodiment, both the positive lens and the negative lens are made of low-dispersion optical materials.

[0010] In an alternative embodiment, the positive lens of the achromatic lens is made of Fused Silica material, and the negative lens is made of Calcium Fluoride material.

[0011] In an alternative embodiment, a lens holder is provided inside the collimator body housing. The achromatic lens and the compensating mirror are installed in the lens holder, and a spacer is provided between the achromatic lens and the compensating mirror. The air gap between the achromatic lens and the compensating mirror is 0.5 mm - 1.2 mm.

[0012] In an alternative embodiment, the spacer is made of aluminum, copper or stainless steel material, and the spacer is of an annular structure.

[0013] In an alternative embodiment, the collimator body housing is a sleeve made of aluminum alloy or titanium alloy.

[0014] In an alternative embodiment, a heat-insulating layer and an anti-reflection coating are sequentially provided on the inner surface of the collimator body housing.

[0015] In an alternative embodiment, a connector for threaded connection with the fiber optic connector is provided at one end on the outer side of the collimator body housing. The connector is provided with an external thread. The collimator body housing is threadedly connected to the fiber optic connector through the connector. An interface channel that is connected to the connector and for the fiber end face to penetrate is provided at the end of the collimator body housing where the fiber optic connector is connected;

[0016] The achromatic lens and the compensating mirror are bonded in the lens holder, and the lens holder is bonded in the collimator body housing.

[0017] In an alternative embodiment, the glue used to glue the negative lens and the positive lens together is UV-curable optical glue.

[0018] Compared with the prior art, the present application has the following beneficial effects:

[0019] The present application provides a wide-spectrum confocal collimator, which includes a collimator main body housing, an optical fiber connector, an achromatic lens, and a compensating mirror. In the present application, an achromatic lens and a compensating mirror are arranged inside the collimator main body housing. During use, the light in the optical fiber is guided into the collimator main body housing through the optical fiber connector. The achromatic lens and the compensating mirror are used as optical components inside the collimator main body housing, enabling the collimator to still maintain high-precision beam collimation and transmission performance under light beams of different wavelengths. The achromatic lens can reduce chromatic aberration and optimize beam collimation, while the compensating mirror further precisely adjusts the beam to ensure that the finally output beam has high-quality collimation and stability. Therefore, through the combined design of the achromatic lens and the compensating mirror, high-precision beam collimation in a wide spectral range is achieved, which is significantly superior to traditional optical fiber collimators. Description of the Drawings

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0021] Figure 1 It is a schematic structural diagram of the wide-spectrum confocal collimator provided by an embodiment of the present application when connecting the optical fiber connector;

[0022] Figure 2 It is a schematic structural diagram of the wide-spectrum confocal collimator provided by an embodiment of the present application when not connecting the optical fiber connector;

[0023] Figure 3 It is an internal schematic diagram of the collimator main body housing provided by an embodiment of the present application;

[0024] Figure 4 It is a schematic overall structural diagram of the wide-spectrum confocal collimator provided by an embodiment of the present application.

[0025] Reference Signs:

[0026] 100, collimator main body housing; 110, connection head; 120, interface channel; 200, optical fiber connector; 210, connector main body; 220, optical fiber sleeve; 230, tail tube; 300, achromatic lens; 310, negative lens; 320, positive lens; 400, compensating mirror; 500, lens seat; 600, spacer ring. Detailed Embodiments

[0027] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the following provides a clear and complete description of the technical solutions in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in this application without creative efforts also fall within the scope of protection of this application.

[0028] In the description of this application, it should be understood that the orientation or positional relationships indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings. These are only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to this application.

[0029] The terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of this application, unless otherwise specified, the meaning of "plurality" is two or more.

[0030] In the description of this application, it should be noted that unless otherwise clearly specified and limited, the terms "mounted", "connected", and "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0031] Figure 1 Schematic diagram of the structure of a wide-spectrum confocal collimator provided by an embodiment of this application when connecting to an optical fiber connector; Figure 2 Schematic diagram of the structure of a wide-spectrum confocal collimator provided by an embodiment of this application when not connecting to an optical fiber connector; Figure 3 Internal schematic diagram of the collimator body housing provided by an embodiment of this application; Figure 4 Overall structural schematic diagram of a wide-spectrum confocal collimator provided by an embodiment of this application.

[0032] In traditional fiber collimators, various glass materials are used to make lenses, while the material of the optical fiber is quartz. Under a wide spectrum, high chromatic aberration will occur, which will cause the focal points of each wavelength of the lens to be different under wide-spectrum light. Therefore, when the entire wide spectrum passes through the lens, there will be multiple divergence angles, including convergence, collimation, and divergence. Overall, it is a chaotic light beam and cannot achieve collimated output well. Wide-spectrum confocal collimators are widely used in optical communication, laser systems, and precision measuring instruments, especially in occasions involving the transmission and processing of multi-wavelength optical signals.

[0033] An embodiment of the present application provides a wide-spectrum confocal collimator, as Figures 1-4 shown, which includes a collimator main body housing 100, an optical fiber connector 200, an achromatic lens 300, and a compensation mirror 400.

[0034] Among them, one end of the collimator main body housing 100 is connected with an optical fiber connector 200 for connecting an optical fiber so that the light output by the optical fiber can enter the collimator main body housing 100. At the end of the collimator main body housing 100 far from the optical fiber connector 200, a group of achromatic lenses 300 and a compensation mirror 400 are arranged in sequence along the optical path direction. There is an air gap between the compensation mirror 400 and the achromatic lens 300. The optical fiber connector 200 is connected with an optical fiber and can make the end face of the optical fiber coincide with the focal point of the achromatic lens 300 in the collimator main body housing 100 after being connected with the collimator main body housing 100. There is also an air gap between the end face of the optical fiber and the achromatic lens 300. When the end face of the optical fiber (i.e., the fiber head) is located at the focal point of the achromatic lens 300, the divergent light beam output by the optical fiber will be collimated into a parallel light beam after passing through the lens, realizing the core function of the fiber collimator, enabling the light beam to propagate over a long distance without divergence. Moreover, the achromatic lens 300 can correct the chromatic aberration of the light beam, making the light of different wavelengths focus at the same point, ensuring that the light of different wavelengths maintains the same path during propagation, thereby reducing the dispersion effect and improving the quality of the light beam. Therefore, through the combined design of the achromatic lens 300 and the compensation mirror 400, high-precision beam collimation in a wide spectral range is achieved, which is significantly better than traditional fiber collimators.

[0035] Since the optical fiber connector 200 can make the end face of the optical fiber coincide with the focal point of the achromatic lens 300 in the collimator main body housing 100 after being connected with the collimator main body housing 100, this can also leave an air gap between the end face of the optical fiber and the achromatic lens 300. This helps to reduce reflection loss. If there is no air gap and the end face of the optical fiber is in direct contact with the achromatic lens 300, it may cause reflection and interference effects, affecting the quality of the light beam. At the same time, this air gap can also prevent the surface of the achromatic lens 300 from being in direct contact with the end face of the optical fiber, thereby reducing contamination or mechanical damage and maintaining the cleanliness and stability of the optical system.

[0036] In this embodiment, the end face of the optical fiber coincides with the focal point of the achromatic lens 300, which means that the end face of the optical fiber is at the focal point position of the achromatic lens 300. After the optical fiber connector 200 is completely connected to the collimator body housing 100, the position of the end face of the optical fiber is fixed. The focal point of the achromatic lens 300 is the key position for beam collimation. Fixing the end face of the optical fiber at this focal point position ensures that the beam emitted by the optical fiber can form a parallel beam after passing through the lens, thereby realizing the core function of the collimator. Moreover, at the focal point position, the beam can be collimated by the lens to the greatest extent, reducing optical loss and scattering and improving the efficiency of the system.

[0037] The wide-spectrum confocal collimator provided by the embodiment of the present application includes a collimator body housing 100, an optical fiber connector 200, an achromatic lens 300, and a compensation mirror 400. In the present application, the achromatic lens 300 and the compensation mirror 400 are arranged in the collimator body housing 100. During use, the light in the optical fiber is guided into the collimator body housing 100 through the optical fiber connector 200. The achromatic lens 300 and the compensation mirror 400 are used as optical components inside the collimator body housing 100, enabling the collimator to maintain high-precision beam collimation and transmission performance under light beams of different wavelengths. The achromatic lens 300 can reduce chromatic aberration and optimize beam collimation, while the compensation mirror 400 further precisely adjusts the beam to ensure that the finally output beam has high-quality collimation and stability.

[0038] In the embodiment of the present application, inside the collimator body housing 100, the compensation mirror 400 is arranged after the optical path of the achromatic lens 300. The main purpose is to further optimize the quality and directivity of the beam and compensate for the optical errors that the achromatic lens 300 may not be able to completely correct. Although the achromatic lens 300 can effectively reduce the chromatic aberration between lights of different wavelengths, it may still have some aberrations or slight wavefront distortions. The compensation mirror 400 can further correct these residual aberrations by adjusting the shape of the reflecting surface to ensure that the beam has better collimation performance and higher optical quality when output. Moreover, each element in the optical system will introduce certain errors, and these errors may accumulate in the system. By adding the compensation mirror 400 after the achromatic lens 300, these errors can be corrected in a timely manner to prevent them from having a significant impact on the final performance of the system. In summary, the setting of the compensation mirror 400 after the achromatic lens 300 can improve the overall performance of the wide-spectrum confocal collimator in the embodiment of the present application, ensuring that the beam has higher quality and better collimation when output, which is particularly important for high-precision optical systems because it can minimize the influence of various optical errors. Optionally, in this embodiment, the compensation mirror 400 is selected as a biconvex lens.

[0039] In some embodiments, the achromatic lens 300 includes a negative lens 310 (also known as a concave lens) and a positive lens 320 (also known as a converging lens or a convex lens) arranged in sequence along the optical path direction. The positive lens 320 is disposed on the rear side of the optical path of the negative lens 310, and the negative lens 310 and the positive lens 320 are glued together. This combination can effectively eliminate chromatic aberration within a wide spectral range. The compensating lens 400 is located behind the optical path of the achromatic lens 300 and is separated from the achromatic lens 300 by an air gap, and is used to further correct the residual chromatic aberration in the optical path.

[0040] In some embodiments, both the positive lens 320 and the negative lens 310 are made of low-dispersion optical materials to reduce the refractive differences of light with different wavelengths in the lens and can reduce the optical loss of the system to ensure good performance within a wide wavelength range.

[0041] In some embodiments, the positive lens 320 of the achromatic lens 300 is made of Fused Silica material, and the negative lens 310 is made of Calcium Fluoride material. The selection of these materials exhibits excellent optical performance within the ultraviolet to near-infrared wavelength range and can effectively reduce the chromatic aberration of light beams with different wavelengths and improve the overall transmittance of the system.

[0042] In some embodiments, a lens mount 500 is provided inside the collimator body housing 100. The achromatic lens 300 and the compensating lens 400 are installed in the lens mount 500, and a spacer 600 is provided between the achromatic lens 300 and the compensating lens 400 to ensure the size of the air gap between the achromatic lens 300 and the compensating lens 400, so as to ensure their relative positions are accurate. The size of the air gap between the achromatic lens 300 and the compensating lens 400 is 0.5 mm - 1.2 mm. In order to effectively eliminate or reduce chromatic aberration, the air gap between the lenses must be precisely controlled. This gap affects the propagation path of light, thereby affecting the effect of chromatic aberration correction; moreover, the size of the air gap also affects the focal length and focusing ability of the collimator. If the gap is too large or too small, it may result in inaccurate focusing or the generation of additional aberrations. In this embodiment, the size of the air gap between the achromatic lens 300 and the compensating lens 400 is between 0.5 mm and 1.2 mm. The specific gap size can be determined by the requirements of optical design to ensure optical performance and chromatic aberration correction effect. During installation, it should be ensured that the gap between the achromatic lens 300 and the compensating lens 400 is between 0.5 mm - 1.2 mm to avoid insufficient chromatic aberration correction.

[0043] In this embodiment, the achromatic lens 300 and the compensating mirror 400 share a lens mount 500, which can make the overall structure of the collimator more compact, reduce the volume of the optical system. Moreover, since the two lenses, the achromatic lens 300 and the compensating mirror 400, share a lens mount 500, their relative positions can be more easily maintained in precise alignment, reducing the impact of assembly errors on the optical performance. At the same time, during the assembly process, the number of independent components that need to be aligned and fixed can be reduced, simplifying the assembly process.

[0044] During use, first install the achromatic lens 300 and the compensating mirror 400 in the lens mount 500, and then install the lens mount 500 with the installed achromatic lens 300 and compensating mirror 400 in the collimator body housing 100, which can ensure the optical performance and stability of the collimator. Optionally, the lens mount 500 adopts a cylindrical structure to facilitate mating with the optical cavity in the collimator body housing 100. The material of the lens mount 500 can be selected from aluminum alloy or stainless steel. Aluminum alloy is lightweight and easy to process, while stainless steel provides higher strength and corrosion resistance. To enhance durability and reduce optical reflection, the surface of the lens mount 500 can be anodized or coated with an anti-reflection coating.

[0045] The spacer 600 used between the achromatic lens 300 and the compensating mirror 400 can precisely control the distance between the achromatic lens 300 and the compensating mirror 400. The lens spacing in the optical system has a crucial impact on the collimation, focusing, and chromatic aberration correction of the light beam. The use of the spacer 600 can ensure a fixed distance between the achromatic lens 300 and the compensating mirror 400, maintain the optical design parameters of the system, and ensure that the optical performance meets the expectations. Moreover, the use of the spacer 600 helps to ensure the stability of the lens in the lens mount, preventing the lens from shifting during vibration or thermal expansion and contraction. By increasing mechanical stability, the spacer 600 helps to achieve optical alignment and performance stability of the collimator.

[0046] In some embodiments, the spacer 600 is made of aluminum, copper, or stainless steel material, having good mechanical strength and thermal stability, and is suitable for application in optical systems requiring high precision and high stability. Among them, the spacer 600 is in a ring structure. By adopting this common ring structure, a uniform gap between the achromatic lens 300 and the compensating mirror 400 can be ensured. In addition, the material and structural design of the spacer 600 can be selected differently according to application requirements, such as various forms like metal, plastic, glass, etc., and different thicknesses and geometric shapes can be provided according to needs.

[0047] In some embodiments, the collimator body housing 100 is a sleeve made of aluminum alloy or titanium alloy, which has high strength and a low coefficient of thermal expansion and is used to accommodate optical elements and other necessary components inside.

[0048] In some embodiments, to reduce the impact of environmental temperature changes on the optical system and lower the optical losses in the system, in this embodiment, a heat-insulating layer and an anti-reflection coating are sequentially provided on the inner surface of the collimator body housing 100. By providing the heat-insulating layer, it can be used to reduce the impact of heat on the optical elements, while the anti-reflection coating reduces internal reflections, thereby improving the light transmission efficiency.

[0049] Among them, the material of the heat-insulating layer can be selected as ceramic materials, such as alumina (Al 2 O 3 ) or zirconia (ZrO 2 ), etc. These materials have excellent heat-insulating performance and mechanical strength, and can also withstand high-temperature and high-pressure environments. When applied, the ceramic material can be evenly coated on the inner surface of the collimator body housing 100 through plasma spraying or thermal spraying technology to form a dense heat-insulating layer, which can significantly improve the reliability and durability of the collimator under extreme temperature conditions, reduce the impact of temperature fluctuations on optical performance, and is an important means to ensure the stability of high-precision optical systems.

[0050] The material of the anti-reflection coating can be selected as silica (SiO 2 ), titanium oxide (TiO 2 ), alumina (Al 2 O 3 ), magnesium fluoride (MgF 2 ), etc. These materials can be deposited on the inner surface of the collimator body housing 100 through physical vapor deposition (PVD), chemical vapor deposition (CVD) or sputtering processes. Their use in fiber collimators helps to improve the signal transmission efficiency and measurement accuracy of the entire system, and is one of the key technologies to ensure the performance of optical systems.

[0051] In some embodiments, a connector head 110 for threaded connection with an optical fiber connector 200 is provided at one outer end of the collimator body housing 100. The connector head 110 is provided with an external thread for tightly connecting with a part of the optical fiber connector 200. The collimator body housing 100 is threadedly connected with the optical fiber connector 200 through the connector head 110. This design allows for easy disassembly and maintenance. An interface channel 120, which is connected to the connector head 110 and is used for the optical fiber end face to penetrate, is provided at one end of the collimator body housing 100 where the optical fiber connector 200 is connected, so that the optical fiber end face coincides with the focal point of the achromatic lens 300 inside the collimator body housing 100. In this embodiment, the used optical fiber connector 200 includes a connector body 210, an optical fiber ferrule 220, and a tail tube 230. Among them, the interior of the connector body 210 contains a component for fixing the optical fiber, that is, the optical fiber ferrule 220 inside the connector body 210, which is used for precisely positioning the optical fiber end face. The optical fiber ferrule 220 is usually made of ceramic and functions to fix the optical fiber. After the optical fiber passes through the optical fiber ferrule 220, its end face needs to be precisely ground. The tail tube 230 is used to protect the bending radius of the optical fiber tail and prevent signal attenuation caused by excessive bending of the optical fiber inside the connector. The connector body 210 is provided with an internal thread for threaded connection with the connector head 110, and after being threadedly connected with the connector head 110, the connector head 110 will not be exposed, so as to protect the connector head 110 through the connector body 210. When the optical fiber connector 200 is connected to the collimator body housing 100, one end of the optical fiber connector 200 biased towards the connector head 110 is inside the connector head 110 and the optical fiber end face penetrates into the interface channel 120. After the connector head 110 and the optical fiber connector 200 are threadedly connected and fixed, the optical fiber end face is at the inner port of the interface channel 120. In practical applications, the lens holder 500 can be installed at a suitable position inside the collimator body housing 100, so that the focal point of the achromatic lens 300 is just at the inner port of the interface channel 120, so that the optical fiber end face coincides with the focal point of the achromatic lens 300, realizing the fixation of the optical fiber end face at the focal point position of the achromatic lens 300.

[0052] Furthermore, the achromatic lens 300 and the compensating lens 400 are bonded within the lens holder 500, and the lens holder 500 is bonded within the collimator body housing 100 to ensure the stable positions of all components. Optionally, for bonding the achromatic lens 300 and the compensating lens 400 within the lens holder 500, a UV-curable optical adhesive can be used. This adhesive can cure rapidly under ultraviolet light irradiation, has good transparency and low shrinkage, is suitable for bonding optical components, can ensure the accurate alignment between lenses, and reduce the impact on optical performance. For bonding the lens holder 500 within the collimator body housing 100, an epoxy resin-based adhesive can be used. Epoxy resin adhesives have good bonding strength and weather resistance, can maintain a stable bonding effect in different environments, and are suitable for bonding metals and optical components.

[0053] In the collimator, it is crucial to select a suitable adhesive for bonding between the negative lens 310 and the positive lens 320 of the achromatic lens 300. For bonding the achromatic lens 300, a special optical adhesive must be used. Such adhesives generally have good light transmittance and low light absorption rate to avoid affecting optical performance. In some embodiments, the adhesive used for gluing the negative lens 310 and the positive lens 320 together is a UV-curable optical adhesive, which is suitable for bonding the achromatic lens 300, can ensure the relative positions of the negative lens 310 and the positive lens 320 are fixed, and can effectively transmit light. This adhesive has a fast curing speed, high transparency, stable refractive index, high bonding strength, etc., and can be used for bonding optical components that require rapid curing and high transparency requirements. When applying the bonding of the achromatic lens 300, a UV-curable optical adhesive (such as NOA61) is the first choice because it can cure in a short time and provide good optical performance. If higher requirements for bonding strength and environmental resistance are needed, an epoxy resin optical adhesive (such as EPO-TEK 301) can be considered. It has excellent weather resistance, high mechanical strength, and good long-term stability, is suitable for use in more demanding environments, has a relatively long curing time, but can provide stronger bonding force and stability. When using glue for bonding, it is necessary to precisely control the thickness and coating position of the glue to ensure that the optical axis and geometric center of the lens are aligned. An overly thick glue layer may introduce optical axis deviation and affect the beam quality.

[0054] Working principle: The fiber optic connector 200 fixes the fiber end face inside the main body housing 100, making its fiber end face precisely aligned with the focus of the achromatic lens 300. After the light beam enters the collimator of the present application through the optical fiber, it first passes through the air gap between the fiber end face and the achromatic lens 300, and then passes through the achromatic lens 300 (the achromatic lens 300 is composed of a negative lens 310 and a positive lens 320). The dispersion characteristics of different materials are used to pre-correct the light beam, effectively reducing the chromatic aberration within the wide wavelength band. Then, after passing through the air gap between the achromatic lens 300 and the compensating mirror 400, the light beam passes through the compensating mirror 400, and the compensating mirror 400 further corrects the remaining chromatic aberration in the optical path to ensure the collimated output of the light beam. The wide-spectrum confocal collimator of the embodiment of the present application can operate within a wide spectral range of 300 nm to 1600 nm, and is applicable to multi-wavelength laser systems and broadband light sources. Through the optimized design of the achromatic lens and the compensating mirror, this system can maintain excellent beam quality throughout the wavelength range, with a beam divergence angle less than 0.1 degree, and the focal length is stable within ±0.2 mm, significantly superior to traditional fiber optic collimators. The wide-spectrum confocal collimator of the embodiment of the present application, through the combined design of the achromatic lens 300 and the compensating mirror 400, successfully solves the chromatic aberration problem in the transmission of wide-spectrum light beams. Its structure is simple, easy to install, and can maintain high-efficiency collimation performance under multi-wavelength conditions, having broad application prospects.

[0055] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A wide spectrum confocal collimator, characterized in that: It comprises a collimator main body housing (100), an optical fiber connector (200), an achromatic lens (300) and a compensating mirror (400); One end of the collimator main body shell (100) is connected to the optical fiber connector (200); an end of the collimator main body shell (100) away from the optical fiber connector (200) is provided with a group of achromatic lenses (300) and a compensating mirror (400) arranged in sequence along the optical path direction; an air gap is left between the compensating mirror (400) and the achromatic lens (300); the optical fiber connector (200) is connected to an optical fiber and can make the optical fiber end face coincide with the focus of the achromatic lens (300) in the collimator main body shell (100) after being connected to the collimator main body shell (100).

2. The wide spectrum confocal collimator according to claim 1, characterized in that: The achromatic lens (300) comprises a negative lens (310) and a positive lens (320) arranged in sequence along the optical path direction; the positive lens (320) is arranged on one side of the optical path behind the negative lens (310); the negative lens (310) and the positive lens (320) are glued together; and the compensation mirror (400) is located behind the optical path of the achromatic lens (300).

3. The wide spectrum confocal collimator according to claim 2, characterized in that: The positive lens (320) and the negative lens (310) are both made of low-dispersion optical materials.

4. The wide spectrum confocal collimator according to claim 2 or 3, characterized in that: The positive lens (320) of the achromatic lens (300) is made of fused quartz material, and the negative lens (310) is made of calcium fluoride material.

5. The wide spectrum confocal collimator according to any one of claims 1 to 3, characterized in that: A lens seat (500) is arranged in the collimator main body housing (100), the achromatic lens (300) and the compensating mirror (400) are installed in the lens seat (500), and a spacer (600) is arranged between the achromatic lens (300) and the compensating mirror (400), and the size of the air gap between the achromatic lens (300) and the compensating mirror (400) is 0.5 mm-1.2 mm.

6. The wide spectrum confocal collimator according to claim 5, characterized in that: The spacer (600) is made of aluminum, copper or stainless steel, and is an annular structure.

7. The wide spectrum confocal collimator according to claim 1, characterized in that: The collimator main body shell (100) is a sleeve made of aluminum alloy or titanium alloy.

8. The wide spectrum confocal collimator according to claim 1 or 6, characterized in that: A heat insulation layer and an anti-reflection coating are sequentially arranged on the inner surface of the collimator main body shell (100).

9. The wide spectrum confocal collimator according to claim 5, characterized in that: A connector (110) for threaded connection with the optical fiber connector (200) is provided at one end of the outer side of the collimator main body shell (100); the connector (110) is provided with an external thread; the collimator main body shell (100) is threadedly connected to the optical fiber connector (200) via the connector (110); and an interface channel (120) is provided at one end of the collimator main body shell (100) connected to the optical fiber connector (200) and is communicated with the connector (110) and is used for the optical fiber end face to penetrate therethrough; The achromatic lens (300) and the compensating mirror (400) are bonded inside the lens seat (500), and the lens seat (500) is bonded inside the collimator main body housing (100).

10. The wide spectrum confocal collimator according to claim 2 or 3, characterized in that: The glue used to glue the negative lens (310) and the positive lens (320) together is UV-curing optical glue.

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