CN113721311B - Laser infrared composite attenuation sheet, preparation method thereof and optical axis adjusting device - Google Patents
Laser infrared composite attenuation sheet, preparation method thereof and optical axis adjusting device Download PDFInfo
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- CN113721311B CN113721311B CN202110944240.7A CN202110944240A CN113721311B CN 113721311 B CN113721311 B CN 113721311B CN 202110944240 A CN202110944240 A CN 202110944240A CN 113721311 B CN113721311 B CN 113721311B
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- 239000002131 composite material Substances 0.000 title claims abstract description 79
- 230000003287 optical effect Effects 0.000 title claims abstract description 31
- 238000002360 preparation method Methods 0.000 title abstract description 8
- 238000000034 method Methods 0.000 claims abstract description 12
- 239000000853 adhesive Substances 0.000 claims description 7
- 230000001070 adhesive effect Effects 0.000 claims description 7
- 230000001681 protective effect Effects 0.000 claims description 6
- 230000008569 process Effects 0.000 abstract description 5
- 208000033999 Device damage Diseases 0.000 abstract description 2
- 230000002093 peripheral effect Effects 0.000 description 13
- 239000003292 glue Substances 0.000 description 8
- 239000010410 layer Substances 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 239000012790 adhesive layer Substances 0.000 description 4
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 230000005693 optoelectronics Effects 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000003822 epoxy resin Substances 0.000 description 3
- 229920000647 polyepoxide Polymers 0.000 description 3
- 229920002379 silicone rubber Polymers 0.000 description 3
- 239000004945 silicone rubber Substances 0.000 description 3
- 238000002834 transmittance Methods 0.000 description 3
- 230000002238 attenuated effect Effects 0.000 description 2
- 238000013016 damping Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 229910052732 germanium Inorganic materials 0.000 description 1
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- ORUIBWPALBXDOA-UHFFFAOYSA-L magnesium fluoride Chemical compound [F-].[F-].[Mg+2] ORUIBWPALBXDOA-UHFFFAOYSA-L 0.000 description 1
- 229910001635 magnesium fluoride Inorganic materials 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 230000001902 propagating effect Effects 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/20—Filters
Abstract
The invention discloses a laser infrared composite attenuation sheet, a preparation method thereof and an optical axis adjusting device, wherein the laser infrared composite attenuation sheet comprises: the base lens is suitable for transmitting optical signals of working wave bands except laser, and is provided with a through hole; the laser attenuation sheet is arranged in the through hole and is assembled with the base lens in a flush way, and the laser attenuation sheet is suitable for attenuating laser power. According to the invention, the laser attenuation sheet and the base lens are assembled to form the composite attenuation sheet, the composite attenuation sheet can be integrally arranged between the high-power laser/infrared composite multiband photoelectric device and the target simulator to carry out optical axis debugging, the base lens can allow working waveband optical signals except laser to pass through, and the laser attenuation sheet can attenuate laser power, so that the laser attenuation sheet needs to be arranged and removed back and forth in the debugging process, thereby improving the working efficiency and avoiding the problem of device damage caused by misoperation.
Description
Technical Field
The invention relates to the technical field of laser energy attenuation, in particular to a laser infrared composite attenuation sheet, a preparation method thereof and an optical axis adjusting device.
Background
For high-power laser/infrared composite multiband photoelectric equipment, besides a visible light and infrared sensing system, a laser ranging module is also arranged, and the module irradiates a target by using high-power coded laser pulse, so that the target is indicated for a striking system and ranging is carried out. In such high-power laser/infrared composite multiband photoelectric equipment, the requirement for the consistency of the optical axes of the sensors is very high, so that a multiband composite target simulator is often used for providing an axis adjusting basis for the multiband composite target simulator, the optical axes of the laser and the optical axes of other observable sensors are adjusted to be within a certain precision range, and the effectiveness of striking is ensured.
At present, when the target simulator is used, a whole-piece type laser attenuation sheet is adopted to prevent other lenses in the target simulator from being damaged by high-power laser. However, the base material of the laser attenuation sheet generally cannot transmit infrared wave bands, so that the laser attenuation sheet is used in a time-sharing manner in the current debugging and use processes, when the laser ranging module is debugged, the laser wave bands are used, the laser attenuation sheet is placed in a light path, when the infrared sensor is debugged, the laser attenuation sheet is not used, and the infrared sensor is moved out of the light path, so that the infrared permeability is ensured. The use mode of the repeatedly switched attenuation sheet is low in efficiency, the requirement on the repeated precision is very high, and devices in the target simulator are easily damaged if accidental misoperation occurs.
Disclosure of Invention
The embodiment of the invention provides a laser infrared composite attenuation sheet, a preparation method thereof and an optical axis adjusting device, which are used for at least solving the problems that in the prior art, a whole-sheet type laser attenuation sheet is adopted when photoelectric equipment is used for adjusting an axis, the laser attenuation sheet needs to be placed when a laser ranging module is debugged, the laser attenuation sheet needs to be moved out when an infrared sensor is debugged, and the use mode of the laser attenuation sheet is repeatedly switched, so that the efficiency is low and misoperation is easy to occur.
According to the embodiment of the invention, the laser infrared composite attenuation sheet comprises:
a base lens adapted to transmit an optical signal in an operating band other than laser, the base lens having a through hole;
the laser attenuation sheet is arranged in the through hole and is assembled with the base lens in a flush mode, and the laser attenuation sheet is suitable for attenuating laser power.
According to some embodiments of the invention, the laser attenuation sheet is secured within the through hole of the base lens by an adhesive.
According to some embodiments of the invention, the through hole has a chamfer structure.
According to some embodiments of the invention, the through hole is located in a central region of the base lens.
According to some embodiments of the invention, the base lens has a plurality of through holes, the through holes are arranged at intervals along the circumferential direction of the center of the base lens, and each through hole is provided with one laser attenuation sheet.
According to some embodiments of the invention, the surface of the base lens is coated with an infrared anti-reflection film and/or a protective film.
An optical axis adjusting device according to an embodiment of the present invention includes:
high-power laser/infrared composite multiband photoelectric equipment;
a target simulator;
the laser infrared composite attenuation sheet is positioned between the high-power laser/infrared composite multiband photoelectric device and the target simulator, and the laser infrared composite attenuation sheet is the laser infrared composite attenuation sheet according to any one of the above embodiments.
According to some embodiments of the invention, an outer diameter of a base lens in the laser infrared composite attenuation sheet is equal to or larger than an effective caliber of the target simulator.
According to some embodiments of the invention, the diameter Φ of the laser attenuation sheet in the laser infrared composite attenuation sheet is calculated according to formula 1:
Φ=a+2×tan θ×b formula 1,
where a represents the laser emission aperture, θ represents the laser divergence angle, and b represents the shortest distance from the emission point to the laser attenuator.
According to the preparation method of the laser infrared composite attenuation sheet, the laser infrared composite attenuation sheet is any one of the laser infrared composite attenuation sheets, and the method comprises the following steps:
preparing a base lens and a laser attenuation sheet, wherein the thickness difference of the base lens and the laser attenuation sheet is within a preset range;
placing the base lens and the laser attenuation sheet on a reference flat plate meeting the flatness requirement, and enabling the laser attenuation sheet to be positioned in a through hole of the base lens;
and bonding the base lens and the laser attenuation sheet.
By adopting the technical scheme of the invention, the laser attenuation sheet for attenuating the high-magnification laser is assembled with the base lens to form the composite attenuation sheet, the composite attenuation sheet can be integrally arranged between the high-power laser/infrared composite multiband photoelectric equipment and the target simulator to carry out optical axis debugging, the base lens can allow working waveband optical signals except laser to pass through, and the laser attenuation sheet can attenuate laser power, so that the laser attenuation sheet needs to be arranged and removed back and forth in the debugging process, thereby improving the working efficiency, and avoiding the problems of device damage caused by poor time for arranging or removing the laser attenuation sheet due to misoperation.
The foregoing description is only an overview of the present invention, and is intended to be implemented in accordance with the teachings of the present invention in order that the same may be more clearly understood and to make the same and other objects, features and advantages of the present invention more readily apparent.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. In the drawings:
FIG. 1 is a schematic structural diagram of a laser infrared composite attenuation sheet in an embodiment of the invention;
FIG. 2 is a schematic diagram showing a state of the laser infrared composite attenuation sheet in the preparation process according to the embodiment of the invention;
FIG. 3 is a schematic view of an optical axis adjusting device according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a laser infrared composite attenuation sheet according to an embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
As shown in fig. 1, an embodiment of a first aspect of the present invention provides a laser infrared composite attenuation sheet 2, including:
a base lens 210 adapted to transmit an optical signal of an operating band other than laser light, the base lens 210 having a through hole;
and a laser attenuation sheet 220 disposed in the through hole and flush-fitted with the base lens 210, the laser attenuation sheet 220 being adapted to attenuate laser power.
The base lens 210 includes opposing first and second mirrors and the laser attenuation sheet 220 includes opposing first and second surfaces. The flush assembly is understood to mean that the first surface of the laser attenuator 220 and the first mirror surface of the base lens 210 are in the same plane within the error accuracy after the assembly is completed, and the second surface of the laser attenuator 220 and the second mirror surface of the base lens 210 are in the same plane within the error accuracy after the assembly is completed.
The laser attenuation sheet 220 is arranged in the through hole of the base lens 210 to form the laser infrared composite attenuation sheet 2, and the laser infrared composite attenuation sheet 2 can attenuate laser and does not influence the passing of optical signals of other wave bands, so that the steps of continuously placing and moving out the whole laser attenuation sheet 220 in the test are reduced, and the working efficiency and the test accuracy are improved.
On the basis of the above-described embodiments, various modified embodiments are further proposed, and it is to be noted here that only the differences from the above-described embodiments are described in the various modified embodiments for the sake of brevity of description.
According to some embodiments of the present invention, the diameter of the laser attenuation sheet 220 is slightly smaller than the diameter of the through hole, and the diameter difference between the two may be: and 0.4mm-4mm, so that a gap exists between the laser attenuation sheet 220 and the through hole, thereby facilitating the subsequent adhesive injection layer 230 to adhere.
According to some embodiments of the present invention, the outer peripheral wall of the laser attenuation sheet 220 is adhered and fixed to the inner peripheral wall of the through hole of the base lens 210 by an adhesive member, which may be a laser damage resistant adhesive layer, including but not limited to silicone rubber, epoxy resin adhesive, and the like. Thus, the base lens 210 and the laser attenuation sheet 220 can be firmly bonded together, and damage of the laser to the adhesive layer 230 can be avoided.
According to the embodiment of the present invention, the laser attenuation sheet 220 is screwed to the through hole, an external thread is provided on the outer peripheral wall of the laser attenuation sheet 220, and an internal thread is provided on the inner peripheral wall of the through hole of the base lens 210, so that after the two are stably screwed, the two mirror surfaces of the base lens 210 are respectively located on the same plane with the two surfaces of the laser attenuation sheet 220 within the error range. The bolt connection is adopted to facilitate the disassembly of the laser infrared composite attenuation sheet 2 and the replacement of parts, so that the utilization rate of parts is improved, and the waste of materials is avoided.
As shown in fig. 2, according to some embodiments of the present invention, the through hole has a chamfer structure, and the chamfer structure may be a rounded chamfer provided on the inner peripheral wall of the through hole of the base lens 210, a straight chamfer provided, or another chamfer structure, so long as the area of the injected adhesive layer 230 is enlarged to increase the amount of the adhesive, so that the base lens 210 and the laser attenuator 220 are more firmly adhered together. Of course, the chamfer structure may be provided on the outer peripheral wall of the laser damping sheet 220, or may be provided on both the inner peripheral wall of the through hole and the outer peripheral wall of the laser damping sheet 220.
According to some embodiments of the present invention, the inner peripheral wall of the through hole or the outer peripheral wall of the laser attenuation sheet 220 may be designed to have a wavy or concave surface, or both may be designed to have a wavy or concave surface. The contact area between the glue and the through hole or the laser attenuation sheet 220 can be increased by the design, the glue injection amount is increased, and the substrate lens 210 and the laser attenuation sheet 220 are firmly bonded.
As shown in fig. 1, according to some embodiments of the present invention, the base lens 210 includes a central region located at the geometric center of the base lens 210 and an edge region located at the periphery of the central region, and the through hole is located at the central region of the base lens 210. The design is beneficial to debugging coaxial laser and other light wave signals in subsequent use.
As shown in fig. 4, according to some embodiments of the present invention, the base lens 210 has a plurality of through holes, and the plurality of through holes are arranged at intervals along the circumferential direction of the center of the base lens 210, and each through hole is provided with one laser attenuation sheet 220. The circumferentially spaced arrangement refers to arrangement along a circumference with the center of the base lens 210 as the center and the shortest distance between the center of the base lens 210 and the edge of the base lens 210 as the radius. The number of the through holes may be set according to the actual situation of the target simulator 3, or only one through hole may be provided in the circumferential direction, as long as the actual requirement of the test is satisfied.
In accordance with some embodiments of the present invention, taking the example of using a Cassegrain-type coaxial target simulator to debug the high-power laser/infrared composite multi-band optoelectronic device 1, the hole opening pattern of the base lens 210 is shown in FIG. 4 because the coaxial target simulator 3 has a central field of view obscuration. The outer diameter of the base lens 210 is matched with the target simulator 3 to cover the effective caliber of the target simulator 3, and the main function of the hole opening mode is to avoid the secondary lens of the coaxial target simulator and the shielding area (the broken line part in fig. 4) of the secondary lens frame, so that one hole can be opened, 2-3 holes can be opened according to the use requirement, a laser high-magnification attenuation sheet is assembled in the hole, and according to the parameters of the laser emitting device of the photoelectric equipment: laser emission caliber: 25mm; laser divergence angle θ:3mrad; distance of the optoelectronic device from the target simulator: 60mm-120mm; therefore, the caliber of the laser high-magnification attenuation sheet can be calculated by the formula: Φ=laser emission aperture+2×tan θ×distance=25.36 mm; in order to ensure that different light deflection angles are not introduced into an infrared light beam and a laser light beam when the light beam passes through the novel laser attenuation sheet, the perforated base lens and the laser high-magnification attenuation sheet are guaranteed to have higher accuracy in flushness.
According to some embodiments of the present invention, the surface of the base lens 210 is coated with one or more layers of an infrared anti-reflection film or a protective film, or one or more layers of an infrared anti-reflection film and a protective film may be coated on the surface of the base lens 210 at the same time. The protective film can protect the base lens 210, reduce the damage of high-power laser to the base lens 210, prolong the service life, and the infrared antireflection film can improve the transmittance of other wave band light wave signals except the laser.
The laser infrared composite attenuation sheet 2 is described in detail below with a specific embodiment. It is to be understood that the following description is exemplary only and is not intended to limit the invention in any way. All similar structures and similar variations of the invention are included in the scope of the invention.
According to some embodiments of the present invention, in combination with fig. 1, the laser infrared composite attenuation sheet 2 includes:
the base lens 210, the base lens 210 is circular, and the material of the base lens 210 may be silicon, germanium, magnesium fluoride, infrared glass, or the like. The base lens 210 includes a first mirror surface and a second mirror surface, and the first mirror surface and the second mirror surface are both coated with an infrared anti-reflection film and a protective film, so that the transmittance of optical signals in the infrared wavelength band can be improved, and the damage of high-power laser to the base lens 210 can be reduced. A through hole is formed at the center of the mirror surface of the base lens 210, and the through hole is circular; the center axis of the through hole coincides with the center axis of the base lens 210. The base lens 210 is adapted to transmit optical signals in other operating bands than laser light.
The laser attenuation sheet 220 is circular, the laser attenuation sheet 220 can be a medium-density attenuation sheet such as ZAB25, and the attenuation rate is generally considered to attenuate the energy of the high-power laser to the mw level. The laser attenuation sheet 220 includes a first surface and a second surface. The diameter of the surface of the laser attenuator 220 is smaller than the diameter of the through hole of the base lens 210, and the optimal range of the diameter difference between the two is 0.4mm-4mm. The laser attenuation sheet 220 is disposed in the through hole and is assembled flush with the base lens 210, that is, the first surface of the laser attenuation sheet 220 and the first mirror surface of the base lens 210 are in the same plane after the assembly is completed, and the second surface of the laser attenuation sheet 220 and the second mirror surface of the base lens 210 are in the same plane after the assembly is completed. The laser attenuation sheet 220 is adapted to attenuate laser power. The laser attenuator diameter may be calculated by the following formula:
Φ=laser emission aperture+2×tan θ×distance; θ is the laser divergence angle.
The base lens 210 and the laser attenuator 220 are fixed by adhesion, and after the laser attenuator 220 is placed in the through hole, a laser damage resistant adhesive layer is injected into a gap between the laser attenuator 220 and the through hole, including but not limited to silicone rubber, epoxy resin adhesive, etc., in combination with fig. 2. The inner peripheral wall of the through hole is provided with a chamfer structure with an inclined surface, so that the glue injection amount is increased when the glue layer 230 is injected, the contact area between the glue layer 230 and the inner peripheral wall of the through hole is increased, and the adhesion between the base lens 210 and the laser attenuation lens is firmer.
By adopting the laser infrared composite attenuation sheet 2, the laser attenuation sheet 220 is arranged in the central area of the base lens 210, and the laser infrared composite attenuation sheet 2 can not only attenuate the laser intensity, but also enable the non-laser infrared light signals to penetrate the laser infrared composite attenuation sheet 2. The laser attenuation sheet 220 adopts a neutral density attenuation sheet made of ZAB25 and other materials, has good laser damage resistance, is not easy to damage, improves the reliability of debugging, calibration and working, and improves the positioning accuracy of a laser optical axis. The problems that the laser attenuation rate is low and the reliability is poor due to the fact that the selectable materials of the integral type laser attenuation sheet 220 are few, and the laser positioning accuracy is affected and the device is damaged due to the fact that the laser spot is too large due to the fact that the transmitted laser energy is too high are solved; and the transmittance of the infrared equal-wave band optical signals is improved, and the positioning accuracy of the infrared optical axis is improved. The method can be widely applied to the working processes of adjusting, debugging, calibrating and the like of the high-power laser/infrared composite multiband photoelectric equipment 1.
As shown in fig. 3, an embodiment of a second aspect of the present invention proposes an optical axis adjusting device, including:
a high power laser/infrared composite multiband electro-optical device 1;
a target simulator 3;
the laser infrared composite attenuation sheet 2 is located between the high-power laser/infrared composite multiband photoelectric device and the target simulator 3, and the laser infrared composite attenuation sheet 2 is the laser infrared composite attenuation sheet 2 in any one of the embodiments of the first aspect.
In the debugging of the high-power laser/infrared composite multiband photoelectric device 1 by using the target simulator, the aperture of the laser transmitter of the high-power laser/infrared composite multiband photoelectric device 1 is coaxial with that of the target simulator 3, the laser infrared composite attenuation sheet 2 in the embodiment is placed between the high-power laser/infrared composite multiband photoelectric device 1 and the target simulator 3, and the laser infrared composite attenuation sheet 2 covers the aperture of the propagating beam of the infrared and the laser. The high-power laser emitted by the high-power laser/infrared composite multiband photoelectric device penetrates through the laser infrared composite attenuation sheet 2, and the laser after being attenuated to a large extent reaches the target simulator 3; the infrared light emitted by the target simulator 3 passes through the laser infrared composite attenuation sheet 2 and reaches the photoelectric equipment after being attenuated by a small amplitude, so that the use requirement that the infrared tuning axis emitted by the target simulator 3 smoothly reaches the high-power laser/infrared composite multiband photoelectric equipment 1 by using the standard is met. The parameters of the laser emitting device of the high-power laser/infrared composite multiband photoelectric device 1 are as follows: laser emission caliber: 25mm; laser divergence angle θ:3mrad; distance of the optoelectronic device from the target simulator: 60mm-120mm; therefore, the caliber of the laser high-magnification attenuation sheet can be calculated by the formula: Φ=laser emission aperture+2×tan θ×distance=25.36 mm; in order to provide a certain margin for debugging and working processes, the caliber of the fixed laser high-magnification attenuation sheet is 26mm. The laser infrared composite attenuation sheet 2 in the invention does not influence the transmission of optical signals of other wave bands except laser from the composite attenuation sheet, can effectively reduce the damage of high-power laser emitted by composite multiband photoelectric equipment to parts of the target simulator 3, can solve the problem of laser speckle, and improves the positioning precision of a laser optical axis.
According to some embodiments of the present invention, the outer diameter of the base lens 210 in the laser infrared composite attenuation sheet 2 is greater than or equal to the effective caliber of the target simulator, so as to ensure that the base lens 210 with holes is matched with the target simulator 3, so that optical signals of other wave bands emitted by all the target simulators 3 reach the optoelectronic device through the base lens 210, and the accuracy in axis adjustment is improved.
According to some embodiments of the present invention, the diameter Φ of the laser attenuation sheet 220 in the laser infrared composite attenuation sheet 2 is calculated according to formula 1:
Φ=a+2×tan θ×b formula 1,
where a denotes a laser emission aperture, θ denotes a laser divergence angle, and b denotes a shortest distance of laser light from an emission point to the laser attenuation sheet 220.
The diameter of the required laser attenuation sheet 220 can be specifically calculated according to the formula 1 in combination with the actual use situation so as to meet the test under different data, and the applicability of the composite attenuation sheet is increased.
According to some embodiments of the present invention, the diameter of the laser attenuation sheet 220 actually used may be set to be slightly larger than the diameter of the laser attenuation sheet 220 calculated by equation 1, so as to provide a certain margin for coaxial debugging and operation.
The embodiment of the invention also provides a preparation method of the laser infrared composite attenuation sheet, wherein the laser infrared composite attenuation sheet is the laser infrared composite attenuation sheet 2 in any one of the embodiments of the first aspect, and the method comprises the following steps:
firstly, preparing a base lens 210 and a laser attenuation sheet 220, wherein a through hole is formed in the central area of the base lens 210, the diameter of the through hole is larger than or equal to that of the laser attenuation sheet 220, and the thickness difference between the base lens 210 and the laser attenuation sheet 220 is within a preset range so as to ensure that the base lens 210 and the laser attenuation sheet 220 can be assembled in a flush manner;
then, the base lens 210 is placed on the reference flat plate 4, the laser attenuation sheet 220 is placed in the through hole of the base lens 210, and the surface of the reference flat plate 4, which is in contact with the base lens 210 and the laser attenuation sheet 220, is required to meet the flatness requirement, so that when the base lens 210 and the laser attenuation sheet 220 are placed on the reference flat plate 4, the requirement that the planes of the two mirror surfaces of the base lens 210 are respectively overlapped with the planes of the two surfaces of the laser attenuation sheet 220 can be achieved, as shown in fig. 2;
finally, the base lens 210 and the laser attenuation sheet 220 are bonded using bonding glue, which is not limited to silicone rubber, epoxy resin glue, etc.; in order to increase the adhesion between the base lens 210 and the laser attenuation sheet 220, as shown in fig. 2, a chamfer structure is provided in the through hole, that is, a rounded chamfer is provided on the inner peripheral wall of the through hole of the base lens 210, so that the glue injection area can be enlarged, and the adhesion between the base lens 210 and the laser attenuation sheet 220 is more firm.
It should be noted that the foregoing description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes may be made to the present invention by those skilled in the art, and various combinations of the embodiments may be freely combined. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
In the description of the present specification, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.
Claims (9)
1. A laser infrared composite attenuation sheet, comprising:
a base lens adapted to transmit an optical signal in an operating band other than laser, the base lens having a through hole;
the laser attenuation sheet is arranged in the through hole and is assembled with the base lens in a flush way, and the laser attenuation sheet is suitable for attenuating laser power;
the surface of the base lens is plated with an infrared antireflection film and/or a protective film.
2. The laser infrared composite attenuation sheet according to claim 1, wherein the laser attenuation sheet is fixed in the through hole of the base lens by an adhesive member.
3. The laser infrared composite attenuation sheet of claim 2, wherein the through hole has a chamfer structure.
4. The laser infrared composite attenuation sheet of claim 1, wherein the through hole is located in a central region of the base lens.
5. The laser infrared composite attenuation sheet according to claim 1, wherein the base lens has a plurality of through holes, the plurality of through holes are arranged at intervals along the circumferential direction of the center of the base lens, and one laser attenuation sheet is installed in each through hole.
6. An optical axis adjusting device, characterized by comprising:
high-power laser/infrared composite multiband photoelectric equipment;
a target simulator;
a laser-infrared composite attenuation sheet located between the high-power laser/infrared composite multiband photoelectric device and the target simulator, the laser-infrared composite attenuation sheet being according to any one of claims 1 to 5.
7. The optical axis adjusting apparatus of claim 6, wherein an outer diameter of the base lens in the laser infrared composite attenuation sheet is equal to or larger than an effective caliber of the target simulator.
8. The optical axis adjusting apparatus as claimed in claim 6, wherein the diameter Φ of the laser attenuation sheet in the laser infrared composite attenuation sheet is calculated according to formula 1:
Φ=a+2×tan θ×b formula 1,
where a represents the laser emission aperture, θ represents the laser divergence angle, and b represents the shortest distance from the emission point to the laser attenuator.
9. A method for preparing a laser-infrared composite attenuation sheet, characterized in that the laser-infrared composite attenuation sheet is a laser-infrared composite attenuation sheet according to any one of claims 1 to 5, the method comprising:
preparing a base lens and a laser attenuation sheet, wherein the thickness difference of the base lens and the laser attenuation sheet is within a preset range;
placing the base lens and the laser attenuation sheet on a reference flat plate meeting the flatness requirement, and enabling the laser attenuation sheet to be positioned in a through hole of the base lens;
and bonding the base lens and the laser attenuation sheet.
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| CN202110944240.7A CN113721311B (en) | 2021-08-17 | 2021-08-17 | Laser infrared composite attenuation sheet, preparation method thereof and optical axis adjusting device |
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| CN108287059A (en) * | 2018-01-16 | 2018-07-17 | 南京理工大学 | High-precision near-infrared laser beam quality measurement analysis device |
| CN211857109U (en) * | 2020-03-25 | 2020-11-03 | 南阳市康力达光学仪器有限责任公司 | Multifunctional optical lens |
| CN113125119A (en) * | 2021-04-14 | 2021-07-16 | 中国电子科技集团公司第十一研究所 | Off-axis target simulator and method for multi-spectral-band composite photoelectric equipment focusing and axis adjustment |
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| WO2014147211A1 (en) * | 2013-03-21 | 2014-09-25 | ETH Zürich | Method and device to achieve spatially confined photointeraction at the focal volume of a microscope |
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| CN211857109U (en) * | 2020-03-25 | 2020-11-03 | 南阳市康力达光学仪器有限责任公司 | Multifunctional optical lens |
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