CN115598910A - Optical system for avoiding ablation of optical fiber end face and laser projection device - Google Patents
Optical system for avoiding ablation of optical fiber end face and laser projection device Download PDFInfo
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- CN115598910A CN115598910A CN202211595556.0A CN202211595556A CN115598910A CN 115598910 A CN115598910 A CN 115598910A CN 202211595556 A CN202211595556 A CN 202211595556A CN 115598910 A CN115598910 A CN 115598910A
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- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
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- G03B21/2066—Reflectors in illumination beam
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Abstract
The invention provides an optical system and a laser projection device for avoiding ablation of an optical fiber end face. The optical system comprises a bundling optical fiber, a bundling lens component, a target surface component and a reflector component; the axis of the bundling optical fiber is parallel to the optical axis of the converging lens component and is arranged in an off-axis manner; the target surface assembly is arranged on the light emitting path of the converging lens assembly; the reflector assembly is arranged between the converging lens assembly and the target surface assembly and outside the emergent light beam of the converging lens assembly, and the reflector assembly and the converging optical fiber are respectively arranged on two sides of the optical axis of the converging lens assembly. Due to the off-axis optical path design, the converging lens component deviates from the axis of the bundled optical fiber, the light beam deviates from the axis of the bundled optical fiber after passing through the converging lens component, stray light formed by reflection of the light beam on the non-hollow surface of the target surface component cannot return to the bundled optical fiber from an original optical path, and the stray light can be completely removed after being reflected by the reflector component, so that the end face of the bundled optical fiber cannot be ablated.
Description
Technical Field
The invention relates to the technical field of laser projection, in particular to an optical system for avoiding ablation of an optical fiber end face and a laser projection device.
Background
Laser display is a new generation display technology, and has the characteristics of high brightness, high picture definition, good reliability and the like, so that the laser display is more popular in the market and has very wide application prospect. Wherein, the remote projection formation of image of laser is as an application that laser shows, and it can be with preset pattern or characters, through the remote projection formation of image in building outer wall or low latitude cloud layer even of laser to make the light and shadow show of being more on the spot for the user.
In laser long-distance projection imaging, a high-power laser is generally required to be used for projecting a laser beam with a thin caliber and high energy density onto a metal or quartz target surface, the light beam projected onto an un-hollowed area can be reflected back to the end face of an optical fiber, and the reflected light still has high energy, so that the end face of the optical fiber is easily ablated, the laser projection device is damaged, and the service life of the laser projection device is greatly influenced.
Disclosure of Invention
The invention aims to provide an optical system and a laser projection device for avoiding the ablation of an optical fiber end face, and aims to solve the technical problem that the optical fiber end face is easily ablated because laser is reflected back to the optical fiber end face and still has larger energy in the prior art.
In order to achieve the purpose, the invention adopts the technical scheme that:
in a first aspect, the present invention provides an optical system for avoiding ablation of an end face of an optical fiber, the optical system comprising:
bundling optical fibers;
the convergent lens assembly is arranged on a light emitting path of the bundled optical fiber, and the axis of the bundled optical fiber is parallel to the optical axis of the convergent lens assembly and is arranged in an off-axis manner;
the target surface assembly is arranged on the light emitting path of the converging lens assembly;
the reflector assembly is positioned between the converging lens assembly and the target surface assembly and is arranged outside the emergent light beam of the converging lens assembly, and the reflector assembly and the converging optical fiber are respectively positioned on two sides of the optical axis of the converging lens assembly;
stray light formed by reflection of the target surface assembly is emitted to the reflector assembly, and is reflected by the reflector assembly and then is moved out of the optical system.
In one embodiment, the mirror assembly comprises a first mirror;
the first reflector is positioned between the converging lens assembly and the target surface assembly and is arranged outside the emergent light beam of the converging lens assembly, and the first reflector and the converging optical fiber are positioned on two sides of the optical axis of the converging lens assembly;
the first reflector is obliquely arranged towards the target surface assembly.
In one embodiment, the first mirror is a planar mirror or a concave mirror.
In one embodiment, the mirror assembly further comprises a second mirror;
the second is taken the mirror and is located between first speculum and the target surface subassembly and locate the reflected light beam of target surface subassembly outside, and the second is taken the mirror to the first speculum slope setting of orientation.
In one embodiment, the second mirror is a planar mirror or a concave mirror.
In one embodiment, the reflector assembly further comprises a light absorbing member disposed between the first reflector and the target surface assembly and disposed outside the stray light reflected by the target surface assembly for absorbing the light beam reflected by the first reflector.
In one embodiment, the mirror assembly further comprises a mirror adjustment unit connected to the first mirror for adjusting the position and pitch angle of the first mirror.
In one embodiment, the target surface assembly comprises a target surface, and the target surface is arranged on the light-emitting path of the converging lens assembly;
the axis of the target surface is parallel to the optical axis of the converging lens assembly, and the axis of the target surface and the axis of the bundled optical fibers are respectively positioned on two sides of the optical axis of the converging lens assembly.
In one embodiment, the target surface assembly further comprises a target surface adjustment unit connected to the target surface for adjusting the position of the target surface.
In a second aspect, the present invention further provides a laser projection apparatus, where the laser projection apparatus includes a laser and the above-mentioned optical system for avoiding ablation of the end face of the optical fiber, and the laser is connected to the bundled optical fiber of the optical system.
The optical system and the laser projection device for avoiding the ablation of the end face of the optical fiber have the advantages that: on one hand, due to the off-axis optical path design, the converging lens component deviates from the axis of the bundled optical fiber, the light beam of the bundled optical fiber deviates from the axis of the bundled optical fiber after passing through the converging lens component, and stray light formed by the reflection of the light beam on the non-hollow surface of the target surface component cannot return to the bundled optical fiber from an original optical path, so that the end face of the bundled optical fiber cannot be ablated; on the other hand, the stray light can be completely removed from the optical system after being reflected by the reflector component, and the phenomenon that the stray light enters the target surface component again to form a ghost image to influence the projection effect is avoided.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed for the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic diagram of an optical path structure of an optical system in the prior art;
FIG. 2 is a schematic diagram of an optical path structure of an optical system for avoiding fiber end face ablation according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of another optical path structure of an optical system for avoiding ablation of an end face of an optical fiber according to an embodiment of the present invention;
fig. 4 is a schematic diagram of another optical path structure of an optical system for avoiding ablation of an end face of an optical fiber according to an embodiment of the present invention.
Wherein, in the figures, the respective reference numerals:
101-an optical fiber; 102-a converging lens; 103-lettering target surface;
201-bundling optical fibers; 202-a converging lens assembly; 203-a target surface component; 204-a mirror assembly; 205-a first mirror; 206-a second mirror; 207-light absorbing member.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly or indirectly secured to the other element. When an element is referred to as being "connected to" another element, it can be directly or indirectly connected to the other element. The terms "upper", "lower", "left", "right", "front", "back", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positions based on the orientations or positions shown in the drawings, and are for convenience of description only and not to be construed as limiting the technical solution. The terms "first", "second" and "first" are used merely for descriptive purposes and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features. The meaning of "plurality" is two or more unless specifically limited otherwise.
With the continuous development of laser display technology, the application scenes of the laser display technology are also continuously enriched, wherein laser remote projection imaging is more attractive in the market because the laser remote projection imaging has a novel form and can bring more shocking text or image display effects to users.
Fig. 1 shows an optical system for laser teleprojection in the prior art. The optical system comprises an optical fiber 101, a converging lens 102 and a lettering target surface 103 which are arranged in sequence along an optical path. The axis of the optical fiber 101 and the optical axis of the converging lens 102 are coaxially arranged, the high-power laser is connected with the optical fiber 101, and laser generated by the high-power laser is emitted to the converging lens 102 through the optical fiber 101 and is projected onto the lettering target surface 103 after passing through the converging lens 102. The lettering target surface 103 is provided with hollow fonts or patterns, light beams projected to the hollow parts are transmitted, light beams of the non-hollow parts are reflected back to the converging lens 102, and the light beams irradiate the end surface of the optical fiber 101 again after passing through the converging lens 102. Because the light beam reflected by the lettering target surface 103 still has high energy, the end surface of the optical fiber 101 is easy to ablate, thereby damaging the optical system and greatly influencing the projection effect and the service life of the laser projection device.
The embodiment provides a brand new optical system, which can effectively solve the problem of ablation on the end face of the optical fiber, ensure the projection effect of the laser projection device and prolong the service life of the laser projection device. As shown in FIG. 2, the optical system for avoiding the ablation of the end face of the optical fiber provided by the present embodiment comprises a bundled optical fiber 201, a converging lens assembly 202, a target surface assembly 203 and a mirror assembly 204. Wherein, the bundling optical fiber 201 is used for connecting with a laser; the converging lens assembly 202 is arranged on the light emitting path of the bundled optical fiber 201, and the axis of the bundled optical fiber 201 is parallel to the optical axis of the converging lens assembly 202 and is arranged in an off-axis manner; the target surface assembly 203 is arranged on the light-emitting path of the converging lens assembly 202; the mirror assembly 204 is located between the converging lens assembly 202 and the target surface assembly 203 and is arranged outside the outgoing light beam of the converging lens assembly 202, and the mirror assembly 204 and the bundled optical fiber 201 are respectively located on two sides of the optical axis of the converging lens assembly 202. The stray light formed by reflection of the target surface assembly 203 exits to the reflector assembly 204, and is reflected by the reflector assembly 204 and then moves out of the optical system.
The bundled optical fiber 201 may be positioned above the optical axis of the converging lens assembly 202 with the mirror assembly 204 positioned below the optical axis of the converging lens assembly 202. The bundled optical fiber 201 may also be positioned below the optical axis of the converging lens assembly 202, with the mirror assembly 204 positioned above the optical axis of the converging lens assembly 202.
For convenience of description, the embodiment is described by taking the example that the bundled optical fiber 201 is located above the optical axis of the converging lens assembly 202. Due to the off-axis optical path design, the converging lens assembly 202 is deviated from the axis of the bundled optical fiber 201 downwards, the light beam of the bundled optical fiber 201 is deviated from the axis of the bundled optical fiber 201 downwards after passing through the converging lens assembly 202, and the reflector assembly 204 is positioned below the emergent light beam of the converging lens assembly 202 at the moment so as to avoid shielding the emergent light beam and ensure that the emergent light beam can be projected onto the target surface assembly 203. Stray light formed by light beams reflected on the non-hollow surface of the target surface component 203 cannot return to the bundled optical fiber 201 from an original light path, so that the end face of the bundled optical fiber 201 cannot be ablated, but downwards exits to the reflector component 204, and the position and the angle of the reflector component 204 are adjusted, so that the stray light can be completely removed from an optical system after being reflected by the reflector component 204, and the stray light is prevented from entering the target surface component 203 again to form ghost images, and the projection effect is prevented from being influenced.
Further, the converging lens assembly 202 includes at least one converging lens for converging the incident light beam and then emitting the converged light beam to the target surface assembly 203, so as to achieve a better laser projection effect. When the number of the condensing lenses is plural, the plural condensing lenses are disposed along the optical path, and the optical axes of the plural condensing lenses coincide. The converging lens assembly 202 may further include an adjusting unit, which is connected to the converging lens and is used to adjust an off-axis distance of the converging lens with respect to the bundled optical fiber, so that the off-axis distance between the bundled optical fiber 201 and the converging lens assembly 202 may be adjusted as required, thereby adjusting a degree of the light beam deviating from the axis of the bundled optical fiber 201 downward after passing through the converging lens assembly 202.
Further, the target assembly 203 comprises a target, preferably a high reflectivity, high temperature resistant metal or quartz, which is provided with a hollowed-out lettering or design. The target surface is arranged on the light emitting path of the converging lens assembly 202, the axis of the target surface (perpendicular to the arrangement direction of the target surface) is parallel to the optical axis of the converging lens assembly 202, and the axis of the target surface and the axis of the bundled optical fiber 201 are respectively positioned on two sides of the optical axis of the converging lens assembly 202. That is, when the axis of the bundled optical fiber 201 is located above the optical axis of the converging lens assembly 202, the axis of the target surface is located below the converging lens assembly 202 and is disposed on the same side as the mirror assembly 204. Because the bundled optical fiber 201 and the converging lens assembly 202 are arranged in an off-axis manner, the light beam emitted by the converging lens assembly 202 can deviate from the axis of the bundled optical fiber 201 downwards, and when the axis of the target surface is arranged below the optical axis of the converging lens assembly 202, the light beam can be ensured to be projected on the target surface more fully, and meanwhile, stray light formed by the reflection of the target surface can be better reflected out of the optical system. The target surface can be replaced according to the needs to satisfy different projection requirements. The target surface assembly 203 may further be provided with a target surface adjusting unit connected to the target surface for adjusting the position of the target surface in the vertical direction and the horizontal direction, thereby adjusting the off-axis distance of the target surface with respect to the converging lens and the distance of the target surface with respect to the converging lens.
Further, the mirror assembly 204 may be specifically configured as desired.
For example, referring to fig. 2, the mirror assembly 204 includes a first mirror disposed between the converging lens and the target surface and outside the outgoing beam of the converging lens (i.e., below the outgoing beam of the converging lens), and the first mirror and the converging optical fiber 201 are disposed on both sides of the optical axis of the converging lens. In order to better reflect the light beam, the first reflector is arranged obliquely to the target surface, so that the incidence angle of the stray light on the first reflector can be increased. Of course, the inclination angle of the first reflector can be set according to the requirement, and is not limited here. The first reflecting mirror may be a plane reflecting mirror or a concave reflecting mirror, and may be disposed as needed, which is not limited herein. The mirror assembly 204 may further comprise a mirror adjusting unit connected to the first mirror for adjusting the position of the first mirror in the horizontal and vertical directions and the pitch angle, thereby adjusting the position of the first mirror with respect to the convergent lens and the target surface and the angle of the first mirror with respect to the target surface.
For another example, referring to fig. 3, the mirror assembly 204 includes a first mirror 205 and a second mirror 206. The first reflector 205 is located between the convergent lens and the target surface and is arranged outside the emergent light beam of the convergent lens, and the first reflector 205 and the bundling optical fiber 201 are located on two sides of the optical axis of the convergent lens. The second reflector 206 is disposed between the first reflector 205 and the target surface and outside the stray light reflected by the target surface, so as to avoid shielding the stray light. In order to better reflect the stray light, the first reflecting mirror 205 is disposed to be inclined toward the target surface, and the second reflecting mirror 206 is disposed to be inclined toward the first reflecting mirror 205, so that the incident angle of the stray light on the first reflecting mirror 205 and the second reflecting mirror 206 can be increased. By adding the second reflector 206, stray light can be further reflected, and the stray light can be effectively ensured to be completely moved out of the optical system. The first mirror 205 and the second mirror 206 may be plane mirrors or concave mirrors, and may be disposed as needed, which is not limited herein.
For another example, referring to fig. 4, a mirror assembly 204 includes a first mirror 205 and a light absorbing member 207. The first reflector 205 is located between the convergent lens and the target surface and is arranged outside the emergent light beam of the convergent lens, and the first reflector 205 and the bundling optical fiber 201 are located on two sides of the optical axis of the convergent lens. In order to better reflect the stray light, the first reflecting mirror 205 is disposed to be inclined toward the target surface, so that an incident angle of the stray light at the first reflecting mirror 205 can be increased. The light absorbing member 207 is disposed between the first reflector 205 and the target surface and outside the stray light reflected by the target surface, so as to prevent the stray light from being blocked and absorb the stray light reflected by the first reflector 205.
The light absorbing piece 207 is made of a light absorbing material and can effectively absorb visible light, so that stray light can be effectively prevented from entering the target surface again to form ghost images, and the projection effect is prevented from being influenced. The light absorbing member may be obtained by specially processing the resin material, for example, irradiating the resin material with an ion beam emitted from an accelerator to form a plurality of micro-holes; then, expanding the micropores into tapered holes through chemical treatment, so that the resin material has a more precise surface structure; then, black silicon rubber mixed with carbon is filled in the resin material, so that the light absorbing piece is obtained, and the absorptivity of the light absorbing piece on visible light can reach 99.5%. Of course, the light absorbing member can be made of other light absorbing materials, and is not limited herein.
Specific embodiments of optical systems that avoid fiber-optic endface ablation are given below. It should be understood that the following examples are illustrative only and are not intended to limit the scope of protection.
Referring to fig. 2, in the first embodiment:
an optical system for avoiding fiber end face ablation includes a bundled optical fiber 201, a converging lens assembly 202, a target surface assembly 203, and a mirror assembly 204. The bundled optical fiber 201 is used for connection with a laser. The converging lens assembly 202 comprises a converging lens, the converging lens is arranged on the light-emitting path of the bundled optical fiber 201, and the axis of the bundled optical fiber 201 is parallel to and off-axis with the optical axis of the converging lens. The target surface assembly 203 includes a target surface disposed on the light exit path of the converging lens. The mirror assembly 204 includes a first mirror, the first mirror is located between the converging lens and the target surface and is disposed outside the outgoing beam of the converging lens, the first mirror is disposed obliquely toward the target surface, and the first mirror and the bundled optical fiber 201 are respectively located on two sides of the optical axis of the converging lens assembly 202. Stray light formed by reflection of the target surface is emitted to the first reflector, and is removed out of the optical system after being reflected by the first reflector.
Referring to fig. 3, the second embodiment:
an optical system for avoiding fiber end face ablation includes a bundled optical fiber 201, a converging lens assembly 202, a target surface assembly 203, and a mirror assembly 204. The bundled optical fiber 201 is used for connection with a laser. The converging lens assembly 202 comprises a converging lens, the converging lens is arranged on the light-emitting path of the bundled optical fiber 201, and the axis of the bundled optical fiber 201 is parallel to and off-axis with the optical axis of the converging lens. The target surface assembly 203 includes a target surface disposed on a light exit path of the converging lens. The mirror assembly 204 includes a first mirror 205 and a second mirror 206, the first mirror 205 is located between the converging lens and the target surface and is disposed outside the outgoing beam of the converging lens, and the first mirror 205 and the bundled optical fiber 201 are located on both sides of the optical axis of the converging lens. The second reflector 206 is disposed between the first reflector 205 and the target surface and is disposed outside stray light reflected by the target surface. The first mirror 205 is disposed obliquely toward the target surface, and the second mirror 206 is disposed obliquely toward the first mirror 205. Stray light formed by reflection of the target surface is emitted to the first reflector 205, is emitted to the second reflector 206 after being reflected by the first reflector 205, and is removed out of the optical system after being reflected by the second reflector 206.
Referring to fig. 4, the third embodiment:
an optical system for avoiding fiber end face ablation includes a bundled optical fiber 201, a converging lens assembly 202, a target surface assembly 203, and a mirror assembly 204. The bundled optical fiber 201 is used for connection with a laser. The converging lens assembly 202 comprises a converging lens, the converging lens is arranged on the light emitting path of the bundled optical fiber 201, and the axis of the bundled optical fiber 201 is parallel to and off-axis with the optical axis of the converging lens. The target surface assembly 203 includes a target surface disposed on the light exit path of the converging lens. The mirror assembly 204 includes a first mirror 205 and a light absorbing member 207, the first mirror 205 is located between the converging lens and the target surface and is disposed outside the outgoing light beam of the converging lens, the first mirror 205 is disposed obliquely toward the target surface, and the first mirror 205 and the bundled optical fiber 201 are located on both sides of the optical axis of the converging lens. The light absorbing member 207 is disposed between the first reflector 205 and the target surface and outside stray light formed by reflection of the target surface. The stray light reflected by the target surface is emitted to the first reflecting mirror 205, reflected by the first reflecting mirror 205, emitted to the light absorbing member 207, and absorbed by the light absorbing member 207.
The present embodiment also aims to provide a laser projection apparatus, the laser display device includes a laser and the above-mentioned optical system for avoiding the ablation of the end face of the optical fiber, the laser is connected with the bundled optical fiber 201 of the optical system. The laser can be set according to the needs, preferably high power laser, and its quantity can be one, also can be a plurality of to can satisfy the requirement of laser long distance projection (for example building outer wall projection or low latitude cloud layer projection).
The laser projection device provided by the embodiment has the beneficial effects that: on one hand, due to the off-axis optical path design, the converging lens component deviates from the axis of the bundled optical fiber, the light beam of the bundled optical fiber deviates from the axis of the bundled optical fiber after passing through the converging lens component, and stray light formed by reflection of the non-hollow surface of the target surface component cannot return to the bundled optical fiber from the original optical path, so that the end face of the bundled optical fiber cannot be ablated; on the other hand, the stray light can be reflected to the reflector component, so that the stray light formed by the reflection of the target surface component can be completely removed from the optical system after being reflected by the reflector component, and the phenomenon that the stray light enters the target surface component again to form ghost images to influence the projection effect is avoided.
The above description is intended to be illustrative of the preferred embodiment of the present invention and should not be taken as limiting the invention, but rather, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.
Claims (10)
1. An optical system for avoiding ablation of an end face of an optical fiber, the optical system comprising:
bundling optical fibers;
the convergent lens assembly is arranged on a light emitting path of the bundled optical fiber, and the axis of the bundled optical fiber is parallel to the optical axis of the convergent lens assembly and is arranged in an off-axis manner;
the target surface assembly is arranged on the light emitting path of the converging lens assembly;
the reflector assembly is positioned between the converging lens assembly and the target surface assembly and is arranged outside an emergent light beam of the converging lens assembly, and the reflector assembly and the bundling optical fiber are respectively positioned on two sides of an optical axis of the converging lens assembly;
stray light formed by reflection of the target surface component is emitted to the reflector component, and is reflected by the reflector component and then moves out of the optical system.
2. The optical system for avoiding fiber end face ablation according to claim 1, wherein the mirror assembly comprises a first mirror;
the first reflector is positioned between the converging lens assembly and the target surface assembly and is arranged outside an emergent light beam of the converging lens assembly, and the first reflector and the bundled optical fibers are positioned on two sides of an optical axis of the converging lens assembly;
the first reflector is obliquely arranged towards the target surface assembly.
3. The optical system for avoiding ablation of an end face of an optical fiber according to claim 2, wherein the first reflecting mirror is a plane mirror or a concave mirror.
4. The optical system for avoiding fiber-optic endface ablation according to claim 2, wherein said mirror assembly further comprises a second mirror;
the second reflector is arranged between the first reflector and the target surface component and outside a reflected light beam of the target surface component, and the second reflector faces the first reflector in an inclined mode.
5. The optical system for avoiding ablation of an end face of an optical fiber according to claim 4, wherein the second mirror is a plane mirror or a concave mirror.
6. The optical system for avoiding fiber end face ablation according to claim 2, wherein the mirror assembly further comprises a light absorbing member disposed between the first mirror and the target surface assembly and disposed outside the stray light reflected by the target surface assembly for absorbing the light beam reflected by the first mirror.
7. The optical system for avoiding ablation of an end face of an optical fiber according to claim 2, wherein the mirror assembly further comprises a mirror adjusting unit connected to the first mirror for adjusting a position and a pitch angle of the first mirror.
8. The optical system for avoiding ablation of an end face of an optical fiber according to claim 1, wherein the target surface assembly comprises a target surface, and the target surface is arranged on a light-emitting path of the converging lens assembly;
the axis of the target surface is parallel to the optical axis of the converging lens assembly, and the axis of the target surface and the axis of the bundled optical fibers are respectively positioned on two sides of the optical axis of the converging lens assembly.
9. The optical system for avoiding fiber end face ablation of claim 8, wherein said target surface assembly further comprises a target surface adjustment unit connected to said target surface for adjusting the position of said target surface.
10. A laser projection apparatus, characterized in that the laser projection apparatus comprises a laser and the optical system of any of claims 1-9 for avoiding ablation of the end face of the optical fiber, the laser being connected to a bundled optical fiber of the optical system.
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