CN108889728B - Optical fiber output end with return light monitoring function for laser cleaning - Google Patents
Optical fiber output end with return light monitoring function for laser cleaning Download PDFInfo
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- CN108889728B CN108889728B CN201810832094.7A CN201810832094A CN108889728B CN 108889728 B CN108889728 B CN 108889728B CN 201810832094 A CN201810832094 A CN 201810832094A CN 108889728 B CN108889728 B CN 108889728B
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- optical fiber
- laser
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- auxiliary detection
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B7/00—Cleaning by methods not provided for in a single other subclass or a single group in this subclass
- B08B7/0035—Cleaning by methods not provided for in a single other subclass or a single group in this subclass by radiant energy, e.g. UV, laser, light beam or the like
- B08B7/0042—Cleaning by methods not provided for in a single other subclass or a single group in this subclass by radiant energy, e.g. UV, laser, light beam or the like by laser
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/262—Optical details of coupling light into, or out of, or between fibre ends, e.g. special fibre end shapes or associated optical elements
Abstract
An optical fiber output tip with a return light monitoring function for laser cleaning, comprising: a quartz end cap; one end of the main output optical fiber is welded with the quartz end cap; the auxiliary detection optical fiber is welded with the main output optical fiber at the same end of the quartz end cap or welded with the main output optical fiber cladding; the focusing lens is arranged at the other end of the auxiliary detection optical fiber and is used for gathering laser which is reflected by the workpiece to be processed and is transmitted along the auxiliary detection optical fiber; and the photoelectric detector is arranged at the focus at one side of the focusing lens and used for detecting the laser quantity returned along the auxiliary detection optical fiber and gathered by the focusing lens and converting the returned laser into an electric signal for monitoring so as to relieve the technical problems that the returned laser beam burns out the pumping source of the optical fiber laser and the photoelectric detector gives false alarm in the prior art when laser processing is carried out.
Description
Technical Field
The present disclosure relates to the field of high power laser processing tools, and more particularly to an optical fiber output tip for laser cleaning with a return light monitoring function.
Background
The application of the pulse fiber laser for laser cleaning has many advantages: 1. the fiber laser has relatively small volume and high electro-optic efficiency; 2. the laser can be transmitted in a long distance through the optical fiber, so that the application range of the laser is improved; 3. all optical devices in the optical fiber laser are connected by adopting optical fibers, and the optical fiber laser has very high stability and reliability relative to a spatial light path. However, when the fiber laser is used for laser processing, the pump source inside the fiber laser is very easily damaged by laser reflected by a processed object, and especially when the pulse laser is used for industrial processing, the pump source is more easily damaged after the processed object returns due to the fact that the pulse laser has the characteristic of extremely high instantaneous energy. At present, the method for solving the problem that the pump source is damaged by the returning laser comprises two methods: one active method comprises coating high-absorptivity material on the surface of the object to be processed to reduce the reflectivity of the object to be processed to laser; the optical fiber with smaller core diameter and numerical aperture is adopted for laser transmission, the quantity of returned laser transmitted along the optical fiber is reduced, but the method is only suitable for laser light sources with better light beam quality, and for light sources with poorer light beam quality, only the light source transmitted by the optical fiber with large core diameter and large numerical aperture can be adopted, the practicability is very low, and the high-power cleaning pulse optical fiber laser belongs to a type of light source which can only adopt large core diameter and large numerical aperture transmission. The other method is a passive method, which comprises installing a photoelectric detector to monitor the laser quantity returned by the processed part in real time, and alarming or turning off the laser power supply when the laser quantity is greater than a certain value. The method comprises the steps that a photoelectric detector is arranged at the accessory of the output end of the optical fiber, but the position of the detector cannot well restore the real situation between the output optical fiber and a processed workpiece, so the alarm threshold value of the photoelectric detector is usually reduced in order to ensure the reliability, the false alarm rate is higher, and the normal processing cannot be carried out on a plurality of materials with higher reflectivity, so that the method for detecting the returning laser quantity of the core diameter of the optical fiber more truly and accurately is necessary on the basis of actively reducing the returning light.
BRIEF SUMMARY OF THE PRESENT DISCLOSURE
Technical problem to be solved
The utility model provides a laser cleaning is used, has optical fiber output end that return light monitored function to alleviate the laser beam that returns when carrying out laser processing among the prior art and burn out fiber laser pumping source, the false alarm of photoelectric detector technical problem such as.
(II) technical scheme
The present disclosure provides an optical fiber output tip for laser cleaning having a return light monitoring function, including: a quartz end cap; one end of the main output optical fiber is welded with the quartz end cap; the auxiliary detection optical fiber and the main output optical fiber are welded at the same end of the quartz end cap; the focusing lens is arranged at the other end of the auxiliary detection optical fiber and is used for gathering laser which is reflected by the workpiece to be processed and is transmitted along the auxiliary detection optical fiber; and the photoelectric detector is arranged at the focus at one side of the focusing lens and used for detecting the laser quantity which returns along the auxiliary detection optical fiber and is gathered by the focusing lens and converting the returned laser into an electric signal.
In an embodiment of the present disclosure, the optical fiber output tip further includes: the auxiliary laser is used for emitting visible laser which is visible to human eyes and has low power; and the reflection and transmission mirror is arranged at the other end of the focusing lens, reflects the visible laser, further transmits the visible laser to a workpiece to be processed and is used for indicating the position of the invisible output laser.
In an embodiment of the present disclosure, the main output fiber includes: a core diameter, a cladding, and a coating.
In an embodiment of the present disclosure, the auxiliary detection fiber is fused to the cladding of the main output fiber.
In the embodiment of the present disclosure, the core diameter numerical aperture of the auxiliary detection optical fiber is greater than or equal to the core diameter numerical aperture of the main output optical fiber.
In the embodiment of the present disclosure, the number of the auxiliary detection fibers is greater than or equal to 1.
In the disclosed embodiment, the core diameter and the cladding are both quartz-based materials.
In embodiments of the present disclosure, the numerical aperture of the cladding layer is greater than the numerical aperture of the core diameter.
In the disclosed embodiment, when the value of the electric signal converted from the return laser exceeds the set threshold value, the laser power supply is cut off and an alarm is given out.
In the embodiment of the present disclosure, the form of sending an alarm when the value of the electrical signal converted from the returned laser exceeds a set threshold includes: a light or a bell.
(III) advantageous effects
According to the technical scheme, the optical fiber output end with the return light monitoring function for laser cleaning disclosed by the invention has at least one or part of the following beneficial effects:
(1) avoiding the returned laser beam from burning the pumping source of the fiber laser;
(2) the laser quantity returned by the optical fiber core diameter is really and accurately detected.
(3) The efficiency of the laser during laser processing is improved.
Drawings
Fig. 1 is a schematic diagram of an optical fiber output end of a main output optical fiber, an auxiliary detection optical fiber and a quartz end cap which are welded together according to an embodiment of the disclosure.
Fig. 2 is a schematic diagram of an optical fiber output end of an auxiliary detection optical fiber fused with a main output optical fiber according to an embodiment of the disclosure.
FIG. 3 is a schematic diagram of an optical fiber output tip with an auxiliary laser and a mirror mounted thereon according to an embodiment of the present disclosure.
[ description of main reference numerals in the drawings ] of the embodiments of the present disclosure
10-quartz end caps;
20-a primary output fiber;
21-core diameter; 22-a cladding layer; 23-a coating layer;
30-auxiliary detection optical fiber; 40-a focusing lens; 50-a photodetector;
60-auxiliary laser; 70-reflective transmissive mirror.
Detailed Description
The utility model provides a laser cleaning is with, have return light monitoring function's fiber output end, can monitor through the fiber output end that can truer accurate detection fiber core footpath return laser volume more, avoid the laser beam that returns to burn out fiber laser pumping source, also avoid the wrong report police, improve the practicality of laser.
For the purpose of promoting a better understanding of the objects, aspects and advantages of the present disclosure, reference is made to the following detailed description taken in conjunction with the accompanying drawings.
In the embodiment of the present disclosure, fig. 1 is a schematic diagram of an optical fiber output end in which a main output optical fiber, an auxiliary detection optical fiber, and a quartz end cap are fused, as shown in fig. 1, the optical fiber output end includes:
a quartz end cap 10;
a main output fiber 20 with one end fused to the quartz end cap 10;
the auxiliary detection optical fiber 30 is welded at the same end of the quartz end cap 10 together with the main output optical fiber 20;
and the focusing lens 40 is arranged at the other end of the auxiliary detection optical fiber 30 and is used for collecting laser light reflected back from the workpiece to be processed and transmitted back along the auxiliary detection optical fiber 30.
And a photodetector 50 installed at a focal point of one side of the focusing lens 40, for detecting an amount of the laser light returned along the auxiliary detection optical fiber 30 and condensed by the focusing lens 40, and converting the returned laser light into an electrical signal.
One side of the quartz end cap 10 faces to-be-processed parts with high laser reflectivity, and pulse laser forms output laser through the main output optical fiber 20 and the quartz end cap 10 and irradiates to-be-processed parts for processing and application. The auxiliary detection optical fiber 30 and the main output optical fiber 20 are welded together at the same end of the quartz end cap 10, the closer the distance between the two is, the better the other end of the auxiliary detection optical fiber 30 is, a focusing lens 40 for collecting returned laser is installed at the other end of the auxiliary detection optical fiber 30, a tool is used for collecting laser returned back along the auxiliary detection optical fiber 30 as much as possible, a photoelectric detector 50 is installed at the focus of the other end of the focusing lens 40 and is used for detecting the amount of the laser returned along the auxiliary detection optical fiber 30 and converting the returned laser into an electric signal, when the value of the electric signal exceeds a set threshold value, the power supply of the laser is cut off and an alarm is given out, the alarm comprises light or a ring, the core diameter and the numerical aperture of the auxiliary detection optical fiber 30 are larger than the core diameter and the numerical aperture of the main output optical fiber 20, so that the returned laser preferentially enters the auxiliary detection optical fiber, the monitoring of the returning light is completed.
In order to more accurately reflect the laser light of the auxiliary detection fiber 30 to the laser light of the main output fiber 20, a plurality of auxiliary detection fibers 30 may be provided in addition to the auxiliary detection fibers 30 being close to the main output fiber 20.
In the embodiment of the present disclosure, fig. 2 is a schematic diagram of an optical fiber output end of an auxiliary detection optical fiber fused with a main output optical fiber, as shown in fig. 2, the main output optical fiber 20 includes:
a core diameter 21 located at the center of the innermost portion of the output optical fiber 20;
a clad layer 22 covering the core diameter 21; and
and a coating layer coated outside the cladding layer 22.
The detection fiber 30 is directly welded with the cladding of the main output fiber 20, and the numerical aperture of the cladding of the main output fiber 20 is usually larger than that of the core diameter thereof, so that more returned laser light is transmitted back from the cladding, and the detection fiber 30 can be directly welded with the cladding of the main output fiber 20 to detect the returned laser light.
The core diameter 21 and the cladding 22 are both made of quartz-based materials, the numerical aperture of the cladding 23 is larger than that of the core diameter 21, the angle range of the laser returned by the workpiece to be processed irradiating the end face of the main output fiber 20 is large, only the return laser smaller than the numerical apertures of the core diameter 21 and the cladding 22 can return along the main output fiber 20 and damage the pump source, the auxiliary detection fiber 30 and the cladding 22 of the main output fiber 20 are welded together, and the return laser returned along the cladding 22 is directly detected, so that the return laser returned along the core diameter 21 can be more truly reflected, and more return laser still enters the cladding 22 although the area of the cladding 22 is smaller than that of the core diameter 21.
In the embodiment of the present disclosure, fig. 3 is a schematic diagram of an optical fiber output end with an auxiliary laser installed, as shown in fig. 3, a processing laser is a laser with a wavelength invisible to human eyes, so that an operator can know the position of the laser irradiated on a workpiece at any time, an auxiliary laser 60 is usually added, the auxiliary laser 60 emits a visible laser beam visible to human eyes, having very low power and coaxial with the output laser for indication, the visible laser beam emitted by the auxiliary laser 60 is reflected by a reflective mirror 70, and the auxiliary detection optical fiber 30 can also serve as a transmission optical fiber of the visible laser for position indication, and transmits the visible laser beam to the cladding 22 of the main output optical fiber 20 for indicating the position of the output laser beam.
The reflection/transmission mirror 70 reflects the visible laser light and transmits the output laser light for the machining operation.
So far, the embodiments of the present disclosure have been described in detail with reference to the accompanying drawings. It is to be noted that, in the attached drawings or in the description, the implementation modes not shown or described are all the modes known by the ordinary skilled person in the field of technology, and are not described in detail. Further, the above definitions of the various elements and methods are not limited to the various specific structures, shapes or arrangements of parts mentioned in the examples, which may be easily modified or substituted by those of ordinary skill in the art.
From the above description, those skilled in the art should clearly recognize that the optical fiber output tip with return light monitoring function for laser cleaning of the present disclosure.
In summary, the present disclosure provides an optical fiber output tip for laser cleaning and having a return light monitoring function, which can more truly and accurately detect the optical fiber output tip of the laser amount returned by the optical fiber core diameter, so as to avoid the returned laser beam from burning the pump source of the optical fiber laser, avoid false alarm, and improve the practicability of the laser.
It should also be noted that directional terms, such as "upper", "lower", "front", "rear", "left", "right", and the like, used in the embodiments are only directions referring to the drawings, and are not intended to limit the scope of the present disclosure. Throughout the drawings, like elements are represented by like or similar reference numerals. Conventional structures or constructions will be omitted when they may obscure the understanding of the present disclosure.
And the shapes and sizes of the respective components in the drawings do not reflect actual sizes and proportions, but merely illustrate the contents of the embodiments of the present disclosure. Furthermore, in the claims, any reference signs placed between parentheses shall not be construed as limiting the claim.
Unless otherwise indicated, the numerical parameters set forth in the specification and attached claims are approximations that can vary depending upon the desired properties sought to be obtained by the present disclosure. In particular, all numbers expressing quantities of ingredients, reaction conditions, and so forth used in the specification and claims are to be understood as being modified in all instances by the term "about". Generally, the expression is meant to encompass variations of ± 10% in some embodiments, 5% in some embodiments, 1% in some embodiments, 0.5% in some embodiments by the specified amount.
Furthermore, the word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements.
The use of ordinal numbers such as "first," "second," "third," etc., in the specification and claims to modify a corresponding element does not by itself connote any ordinal number of the element or any ordering of one element from another or the order of manufacture, and the use of the ordinal numbers is only used to distinguish one element having a certain name from another element having a same name.
In addition, unless steps are specifically described or must occur in sequence, the order of the steps is not limited to that listed above and may be changed or rearranged as desired by the desired design. The embodiments described above may be mixed and matched with each other or with other embodiments based on design and reliability considerations, i.e., technical features in different embodiments may be freely combined to form further embodiments.
Those skilled in the art will appreciate that the modules in the device in an embodiment may be adaptively changed and disposed in one or more devices different from the embodiment. The modules or units or components of the embodiments may be combined into one module or unit or component, and furthermore they may be divided into a plurality of sub-modules or sub-units or sub-components. All of the features disclosed in this specification (including any accompanying claims, abstract and drawings), and all of the processes or elements of any method or apparatus so disclosed, may be combined in any combination, except combinations where at least some of such features and/or processes or elements are mutually exclusive. Each feature disclosed in this specification (including any accompanying claims, abstract and drawings) may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise. Also in the unit claims enumerating several means, several of these means may be embodied by one and the same item of hardware.
Similarly, it should be appreciated that in the foregoing description of exemplary embodiments of the disclosure, various features of the disclosure are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure and aiding in the understanding of one or more of the various disclosed aspects. However, the disclosed method should not be interpreted as reflecting an intention that: that is, the claimed disclosure requires more features than are expressly recited in each claim. Rather, as the following claims reflect, disclosed aspects lie in less than all features of a single foregoing disclosed embodiment. Thus, the claims following the detailed description are hereby expressly incorporated into this detailed description, with each claim standing on its own as a separate embodiment of this disclosure.
The above-mentioned embodiments are intended to illustrate the objects, aspects and advantages of the present disclosure in further detail, and it should be understood that the above-mentioned embodiments are only illustrative of the present disclosure and are not intended to limit the present disclosure, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present disclosure should be included in the scope of the present disclosure.
Claims (9)
1. An optical fiber output tip with a return light monitoring function for laser cleaning, comprising:
a quartz end cap (10);
a main output fiber (20) with one end fused with the quartz end cap (10);
an auxiliary detection fiber (30) fused to the cladding (22) of the main output fiber (20); the auxiliary detection optical fiber (30) and the main output optical fiber (20) are welded together at the same end of the quartz end cap (10);
the focusing lens (40) is arranged at the other end of the auxiliary detection optical fiber (30) and is used for gathering laser which is reflected by the workpiece to be processed and transmitted along the auxiliary detection optical fiber (30); and
and the photoelectric detector (50) is arranged at the focus of one side of the focusing lens (40) and is used for detecting the amount of the laser light returning along the auxiliary detection optical fiber (30) and gathered by the focusing lens (40) and converting the returning laser light into an electric signal.
2. The fiber optic output tip of claim 1, further comprising:
an auxiliary laser (60) for emitting visible laser light visible to the human eye and having a low power; and
and the reflection and transmission mirror (70) is arranged at the other end of the focusing lens (40) and reflects the visible laser light, so that the visible laser light is transmitted to the workpiece to be processed and is used for indicating the position of the invisible output laser light.
3. The fiber output tip according to claim 1, the primary output fiber (20) comprising: a core (21), a cladding (22), and a coating (23).
4. The fiber output tip according to claim 1, wherein the auxiliary detection fiber (30) has a core diameter numerical aperture equal to or larger than the core diameter numerical aperture of the main output fiber (20).
5. The fiber output tip according to claim 1, wherein the number of the auxiliary detection fibers (30) is 1 or more.
6. The fiber output termination according to claim 3, said core diameter (21) and cladding (22) being both quartz-based materials.
7. The fiber output tip according to claim 3, said cladding (22) having a numerical aperture greater than the numerical aperture of the core (21).
8. The fiber optic output tip according to claim 1, wherein the laser power is cut off and an alarm is issued when the value of the return laser converted electrical signal exceeds a predetermined threshold.
9. The fiber optic output tip according to claim 8, wherein the form of the alarm signal generated when the value of the electrical signal converted from the return laser exceeds a predetermined threshold value comprises: a light or a bell.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810832094.7A CN108889728B (en) | 2018-07-25 | 2018-07-25 | Optical fiber output end with return light monitoring function for laser cleaning |
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| CN201810832094.7A CN108889728B (en) | 2018-07-25 | 2018-07-25 | Optical fiber output end with return light monitoring function for laser cleaning |
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| CN108889728B true CN108889728B (en) | 2021-02-12 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109980494A (en) * | 2019-03-21 | 2019-07-05 | 大族激光科技产业集团股份有限公司 | A kind of monitoring method and fiber laser device of Raman light |
| CN111129915B (en) * | 2019-12-23 | 2021-04-13 | 北京航天控制仪器研究所 | Anti-reflection system and method for optical fiber laser |
| CN111934194B (en) * | 2020-07-01 | 2022-02-22 | 苏州创鑫激光科技有限公司 | Laser device |
| CN113140957B (en) * | 2021-04-16 | 2023-05-02 | 杭州中科极光科技有限公司 | Laser display white balance control system, control method and laser display device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP6534999B2 (en) * | 2014-07-04 | 2019-06-26 | 古河電気工業株式会社 | Optical fiber laser device |
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| CN204621354U (en) * | 2012-07-18 | 2015-09-09 | 古河电气工业株式会社 | Fiber laser unit |
| CN104882770A (en) * | 2015-06-10 | 2015-09-02 | 北京工业大学 | Fiber laser output head having light beam focusing characteristic and power monitoring function |
| CN205070149U (en) * | 2015-10-21 | 2016-03-02 | 武汉锐科光纤激光技术股份有限公司 | Fiber laser with feedback monitoring function |
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