CN109994918A - Laser export head and laser with the laser export head - Google Patents
Laser export head and laser with the laser export head Download PDFInfo
- Publication number
- CN109994918A CN109994918A CN201810001718.0A CN201810001718A CN109994918A CN 109994918 A CN109994918 A CN 109994918A CN 201810001718 A CN201810001718 A CN 201810001718A CN 109994918 A CN109994918 A CN 109994918A
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- China
- Prior art keywords
- optical fiber
- end cap
- fixing piece
- fiber fixing
- glass tube
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 239000013307 optical fiber Substances 0.000 claims abstract description 137
- 239000011521 glass Substances 0.000 claims abstract description 57
- 239000010453 quartz Substances 0.000 claims abstract description 57
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 57
- 238000007789 sealing Methods 0.000 claims abstract description 37
- 230000000903 blocking effect Effects 0.000 claims abstract description 26
- 238000001816 cooling Methods 0.000 claims abstract description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 38
- 230000007797 corrosion Effects 0.000 claims description 27
- 238000005260 corrosion Methods 0.000 claims description 27
- 230000003139 buffering effect Effects 0.000 claims description 7
- 239000000498 cooling water Substances 0.000 claims description 7
- 230000004927 fusion Effects 0.000 claims description 6
- 230000007423 decrease Effects 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 229910052751 metal Inorganic materials 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 4
- 230000017525 heat dissipation Effects 0.000 abstract description 2
- 238000005253 cladding Methods 0.000 description 18
- 239000000835 fiber Substances 0.000 description 14
- 238000003466 welding Methods 0.000 description 10
- 239000000463 material Substances 0.000 description 8
- 230000003247 decreasing effect Effects 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 230000002457 bidirectional effect Effects 0.000 description 4
- 239000011247 coating layer Substances 0.000 description 4
- 239000010410 layer Substances 0.000 description 4
- 230000002829 reductive effect Effects 0.000 description 4
- 230000002159 abnormal effect Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 2
- 230000002411 adverse Effects 0.000 description 2
- 230000003628 erosive effect Effects 0.000 description 2
- 238000005530 etching Methods 0.000 description 2
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 2
- 229910052737 gold Inorganic materials 0.000 description 2
- 239000010931 gold Substances 0.000 description 2
- 230000031700 light absorption Effects 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 238000013021 overheating Methods 0.000 description 2
- 230000036961 partial effect Effects 0.000 description 2
- 238000007747 plating Methods 0.000 description 2
- 238000002310 reflectometry Methods 0.000 description 2
- 229910052709 silver Inorganic materials 0.000 description 2
- 239000004332 silver Substances 0.000 description 2
- 230000008646 thermal stress Effects 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000000149 argon plasma sintering Methods 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000008033 biological extinction Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000009172 bursting Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000010485 coping Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000009931 harmful effect Effects 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000001902 propagating effect Effects 0.000 description 1
- 230000035882 stress Effects 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/02—Constructional details
- H01S3/025—Constructional details of solid state lasers, e.g. housings or mountings
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06704—Housings; Packages
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Optics & Photonics (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Laser Beam Processing (AREA)
- Lasers (AREA)
Abstract
The invention discloses a kind of laser export heads, comprising: outer sealing；Optical fiber fixing piece is contained in outer sealing；Quartzy end cap, it is stepped, it is fixed in end cap fixing piece, ladder high spot is inserted partially into optical fiber fixing piece together with end cap fixing piece；Optical fiber is located in optical fiber fixing piece, and is welded together with the ladder high spot of quartzy end cap；First glass tube is coated on the periphery of optical fiber, is surrounded and is fixed by end cap fixing piece close to one end of quartz end cap, and is housed in optical fiber fixing piece, to form internal layer water-cooling channel between the first glass tube and optical fiber fixing piece；Light blocking part is fixed in optical fiber fixing piece, and around the one end for being clamped in the separate quartzy end cap of the first glass tube.Using laser export head of the invention, structure is simple, has good heat dissipation effect, and can keep out light echo or absorb light echo.
Description
Technical Field
The invention relates to the technical field of laser, in particular to a laser output head and a laser with the same.
Background
With the application of a laser in the aspects of cutting and welding with higher power and the like, the demand on a high-power laser output head of a ten-kilowatt level is higher and higher, the current ten-kilowatt level laser output head mostly adopts a foreign LK-D type structure, the volume is large, the structure is complex, and especially when a high-reflectivity material is cut or welded, the situation of burning optical fibers or devices often occurs because of intense return light.
Disclosure of Invention
The invention mainly aims to provide a laser output and a laser with the laser output head, aiming at solving the problems of simplifying the structure of the output head and more effectively coping with the intensity of the reflected light when cutting a high-reflectivity material or welding so as to protect the laser output head.
In order to achieve the above object, the present invention provides a method comprising:
an outer seal;
the optical fiber fixing piece is accommodated in the outer sealing piece;
the quartz end cap is in a step shape and is fixed in the end cap fixing piece, and the step bulge of the quartz end cap is partially inserted into the optical fiber fixing piece together with the end cap fixing piece;
the optical fiber is positioned in the optical fiber fixing piece and is welded with the stepped bulge of the quartz end cap;
the first glass tube is coated on the periphery of the optical fiber, one end of the first glass tube, which is close to the quartz end cap, is surrounded and fixed by the end cap fixing piece and is contained in the optical fiber fixing piece, so that an inner-layer water cooling channel is formed between the first glass tube and the optical fiber fixing piece;
and the light blocking piece is fixed in the optical fiber fixing piece and is clamped at one end, far away from the quartz end cap, of the first glass tube in a surrounding manner.
Optionally, the light blocking member is inclined and gradually decreases toward the quartz end cap, and a cross-sectional diameter of the light blocking member at a side away from the quartz end cap is equal to an inner diameter of the optical fiber fixing member so as to block the water path.
Optionally, a first stripping area is formed at a position where the optical fiber is close to a fusion joint with the quartz end cap and is sleeved with a first glass tube; and one end of the optical fiber exposed out of the sealing piece forms a second mould stripping area, a second glass tube is sleeved on the second mould stripping area, and a metal shell is packaged outside the second glass tube.
Optionally, performing frosting treatment or corrosion treatment on a position, corresponding to a stripping position of the optical fiber, of the first glass tube wrapping the first stripping area of the optical fiber; and the position of the second glass tube, which wraps the second stripping area of the optical fiber, corresponds to the stripping position of the optical fiber, and is subjected to frosting treatment or corrosion treatment.
Optionally, the optical fiber fixing member has a thin through hole communicated with the accommodating portion; the thin through hole is formed at the tail end of the accommodating part to absorb laser, the cross section diameter of the thin through hole is smaller than that of the accommodating part, and the optical fiber is inserted into the optical fiber fixing part from the thin through hole and extends out; the axial line position of the thin through hole and the axial line position of the light blocking piece are both located on the optical fiber.
Optionally, the water-saving device further comprises a buffering water-retaining ring and a waterproof gasket; the buffering water retaining ring is sleeved at one end, far away from the quartz end cap, of the optical fiber fixing piece and is connected with the optical fiber fixing piece in a sealing mode through the waterproof gasket.
Optionally, one end of the optical fiber fixing member is located in the outer sealing member, and the other end of the optical fiber fixing member extends out of the outer sealing member; the outer seal comprises a water inlet and a water outlet; and cooling water enters from the water inlet, flows into the outer water-cooling channel between the optical fiber fixing piece and the outer sealing piece, flows into a gap between the optical fiber fixing piece and the quartz end cap, further enters the inner water-cooling channel formed between the first glass tube and the optical fiber fixing piece, and flows out from the water outlet.
Optionally, the inner wall of the optical fiber fixing piece is of a double-layer water channel structure, and grooves or threads are arranged on the inner side and/or the outer side of the tube wall of the optical fiber fixing piece to increase the cold water contact surface.
Optionally, the temperature control device further comprises two thermistors electrically connected with the temperature control switch; one thermistor is arranged at the position, close to the fusion joint of the quartz end cap and the optical fiber, of the outer sealing piece, and the other thermistor is arranged at the position, close to the thin through hole of the optical fiber fixing piece, of the outer sealing piece; the temperature control switch is arranged at the position, far away from the quartz end cap, of the optical fiber fixing piece so as to control the circuit to be cut off or reconnected.
In addition, in order to achieve the purpose, the invention also provides a laser, which comprises the laser output head.
The invention provides a laser output head and a laser, comprising: an outer seal; the optical fiber fixing piece is accommodated in the outer sealing piece; the quartz end cap is in a step shape and is fixed in the end cap fixing piece, and the step bulge of the quartz end cap is partially inserted into the optical fiber fixing piece together with the end cap fixing piece; the optical fiber is positioned in the optical fiber fixing piece and is welded with the stepped bulge of the quartz end cap; the first glass tube is coated on the periphery of the optical fiber, one end of the first glass tube, which is close to the quartz end cap, is surrounded and fixed by the end cap fixing piece and is contained in the optical fiber fixing piece, so that an inner-layer water cooling channel is formed between the first glass tube and the optical fiber fixing piece; and the light blocking piece is fixed in the optical fiber fixing piece and is clamped at one end of the first glass tube, which is far away from the quartz end cap in a surrounding manner. The laser output head and the laser have simple structures, effectively reduce the cost, can take away heat through the cooling water between the outer wall of the first glass tube and the light absorption inner wall of the optical fiber fixing piece, and can effectively eliminate return light through the quartz end cap and the light blocking piece during return light so as to reduce the adverse effect of the return light on devices.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a schematic diagram of a laser output head according to a preferred embodiment of the present invention;
FIG. 2 is a schematic cross-sectional view of the laser output head of FIG. 1 taken along the direction A-A;
FIG. 3 is an enlarged view of a portion of the laser output head of FIG. 2 at B;
FIG. 4 is an enlarged view of a portion of the laser output head of FIG. 3 at C;
fig. 5 is an enlarged view of a portion of the laser output head of fig. 2.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1 and fig. 2, fig. 1 is a schematic structural view of a laser output head according to a preferred embodiment of the present invention, and fig. 2 is a schematic structural view of a cross section along a direction a-a in fig. 1. The laser output head includes: an enclosure assembly 100, an energy transmission assembly 200, and a protection device 300, wherein,
referring to fig. 3 and 4 together, fig. 3 is a partial enlarged view of B in fig. 2, and fig. 4 is a partial enlarged view of C in fig. 3. The outer seal assembly 100 includes an outer seal 110, a fiber holder 120, a cushioned water ring 130, a waterproof gasket 140, a armor 150, an armor 160, and an armor holder 170. Wherein,
the outer sealing member 110 is similar to an elongated sleeve-shaped structure, and has a hollow accommodating space for accommodating some components of the laser output head. The outer enclosure 110 includes a water inlet 111 and a water outlet 112.
Further, the water inlet 111 of the outer sealing member 110 is aligned with an external water supply device, cooling water enters from the water inlet 111, and the cooling water enters from the water inlet 111 and flows into the water-cooling channel between the optical fiber fixing member 120 and the outer sealing member 110, and then flows into the gap at the welding position of the quartz end cap 220 and the optical fiber 210, and further enters between the first glass tube 230 and the optical fiber fixing member 120 to form the water-cooling channel, and finally flows out from the water outlet 112.
Optionally, a stopper 113 is disposed on an inner wall of the outer enclosure 110 to divide the accommodating space into a first accommodating space 114 and a second accommodating space 115, and a cross-sectional diameter of the first accommodating space 114 is smaller than a cross-sectional diameter of the second accommodating space 115.
The optical fiber fixing member 120 is located in the accommodating space of the outer sealing member 110, and the length of the optical fiber fixing member 120 is greater than that of the outer sealing member 110, that is, one end of the optical fiber fixing member 120 is located in the accommodating space of the outer sealing member 110, and the other end extends out of the outer sealing member 110. The optical fiber fixing member 120 has a receiving portion 121, and a thin through hole 122 communicated with the receiving portion 121, the thin through hole 122 being formed at a tail end of the receiving portion 121 to absorb laser light and convert it into heat; and the section diameter of the thin through hole 122 is smaller than that of the accommodating part 121. Specifically, the inner wall surrounding the thin through hole 122 may be designed to slightly contact the outer periphery of the optical fiber 210 to enlarge the contact surface. In this embodiment, optical fiber fixing member 120 adopts high heat conduction material, and inside blackens the processing, and the laser that front end stripping module component distributed that can very big absorption to convert it into the heat, carry out the heat with water and be mutual, the conduction heat.
Optionally, the optical fiber fixing member 120 is made of red copper plating gun nickel, the water channel is a double-layer water channel structure with inner and outer water cooling, and grooves or threads are formed on the inner side and/or the outer side of the tube wall, which is equivalent to increase the surface area to contact the cold water.
The buffering water ring 130 is sleeved on an end of the optical fiber fixing element 120 away from the quartz end cap 220 and fixed in the second receiving space 115 of the outer sealing element 110. The water-stop buffer ring 130 and the second receiving space 115 are provided with a waterproof gasket 140 for sealing connection with the optical fiber fixing member 120. The buffering water retaining ring 130 is matched with the waterproof gasket 140, so that the water can be effectively prevented.
The armor member 150 is also of a sleeve-like configuration similar to an elongated bar, and is attached to the end of the outer sealing member 110 remote from the quartz end cap 220, with the fiber securing member 120 partially received within the armor member 150.
The armor 160 is spliced to the end of the fiber mount 120 remote from the quartz end cap 220 and has an armor hole 161 in communication with the thin through hole 122. The armor 160 is secured at one end within the armor piece 150 and at the other end within the armor retainer 170.
As shown in fig. 3 and 4, the energy delivery assembly 200 includes an optical fiber 210 and a quartz endcap 220. Wherein optical fiber 210 and quartz end cap 220 are located within outer seal 110. The optical fiber 210 is used for transmitting laser light, and has one end inserted into the optical fiber holder 120 from the thin through hole 122 and the other end extending out of the optical fiber holder 120 through the armor 160 to be connected to a laser generator (not shown).
The quartz end cap 220 is fused to the end of the optical fiber 210 remote from the buffer water ring 130. In the embodiment, the quartz end cap 220 has a stepped cylindrical structure, and the steps toward the optical fiber 210 are gradually reduced, and the outer wall of each narrowed step surface can further play a role of blocking light.
In this embodiment, the optical fiber 210 and the quartz end cap 220 are made of high-purity quartz materials with similar melting points, and are welded together by laser welding or discharge welding.
After the optical fiber 210 is close to the position where the optical fiber is welded with the quartz end cap 220 and the first glass tube 230 is sleeved, a section of corrosion stripping is performed to form a first stripping area 260. The optical fiber 210 includes a core, a cladding surrounding the core, and a coating layer surrounding the cladding. The stripping means that the coating layer is stripped, so that the light which is originally diffused completely due to the action of the coating layer and transmitted in the optical fiber is emitted/refracted to the outside. In this embodiment, through corroding the mould of shelling to optic fibre 210, the mode of first glass pipe 230 is established to the overcoat, makes optic fibre 210 avoid receiving the direct impact of water, avoids the dirty pollution of aquatic to corrode the optic fibre surface, prevents to burn optic fibre, avoids cold weather water to freeze simultaneously and leads to the optic fibre fracture.
The first glass tube 230 has a length longer than that of the first stripping region 260 and is accommodated in the fiber fixing member 120. The outer side of the first glass tube 230 is etched or frosted to prevent light from propagating on the surface of the glass tube and generating a waveguide, and the light is refracted more easily by the uneven mouth on the surface by the etching or frosting. That is, the first glass tube 230 including the first thin film region 260 of the optical fiber 210 is frosted or etched at a position corresponding to the stripping position of the optical fiber 210. In the light transmitted by the cladding of the optical fiber 210, since the coating layer is stripped and enters the first glass tube 230, the unevenness treatment of the surface of the first glass tube 230 continues to allow the light to come out, thereby achieving the purpose of resisting part of the return light.
Optionally, one end of the first glass tube 230 near the quartz end cap 220 is surrounded and fixed by an end cap fixing member 310 (shown in fig. 4), and the first glass tube 230 and the quartz end cap 220 are welded by laser melting or electrode discharge, so as to achieve the sealing connection between the first glass tube 230 and the quartz end cap 220.
Further, cooling water is disposed between the outer wall of the first glass tube 230 and the light-absorbing inner wall of the optical fiber fixing member 120, and the hydroxyl groups of the water can absorb the laser light scattered from the first glass tube 230 greatly, so as to reduce the energy of the laser light on the optical fiber fixing member. In addition, since the deformation of the outer sealing member 110 is larger than that of the glass tube, the buffering water ring 130 in cooperation with the waterproof gasket 140 can also buffer the tension and compression of the first glass tube 230 by the deformation of the outer sealing member 110 caused by thermal expansion and cold contraction under high and low temperature environments, thereby preventing the first glass tube 230 from bursting.
At the end of the optical fiber 210 exposed to the package assembly 100, namely: the tail end of the optical fiber 210 is stripped by etching to form a second stripping region 270, and a second glass tube 240 is sleeved on the stripped section and encapsulated by a light absorbing and heat dissipating metal shell 250. That is, the second glass tube 240 wraps the second stripping region 270 of the optical fiber 210 at a position corresponding to the stripping position of the optical fiber and is ground or etched.
Optionally, the thin through hole 122 at the tail end of the optical fiber passing through the light blocking member 330 and extending into the optical fiber fixing member 120 is penetrated, so that the optical fiber can absorb as much light as possible after passing through the light blocking member 330, thereby protecting the optical fiber.
Optionally, the surfaces of the first glass tube 230 and the second glass tube 240 are corroded, so that a waveguide is prevented from being formed in the tube wall of the glass tube, and returned light is prevented from being transmitted backwards along the glass tube in a waveguide mode. Meanwhile, the etched surface enables light scattering of the stripped mold to be more uniform, and the local light energy density of the scattered light is reduced.
In this embodiment, the optical fiber 210 is subjected to gradient corrosion by using a frosted corrosion solution, the gradient corrosion may be performed by time gradient corrosion or spatial gradient corrosion, and the gradient corrosion may be performed in a unidirectional decreasing manner or a bidirectional decreasing manner, and the corrosion method specifically includes:
the time gradient corrosion refers to: the surface of the cladding of the optical fiber to be corroded is divided into a plurality of equal sections, the corrosion time of each section is different, the corrosion time of each section can be a unidirectional decreasing mode that the corrosion time of each section is gradually shortened against the advancing direction of the laser, and the corrosion time of each section is the longest from the middle section and can be a bidirectional decreasing mode that the corrosion time of each section is gradually shortened towards the left side and the right side.
The spatial gradient corrosion refers to: dividing the surface of the cladding of the optical fiber to be corroded into a plurality of sections which are not uniform and are spaced from each other, wherein the corrosion time of each section is the same, and the corrosion time of each section can be a unidirectional decreasing mode that the corrosion length of each section is gradually shortened along the direction opposite to the advancing direction of the laser: that is, along the starting position of the laser advancing direction, the length of each section of erosion is shorter, and the interval length is longer, or along the laser advancing direction, the length of each section of erosion is gradually lengthened, and the interval length is gradually shortened; the interval length may be the shortest from the longest corrosion length of the middle section, and the interval may be gradually increased from the shorter corrosion length to each of the left and right sections.
The reason for the one-way decrement is: when the laser output head is applied to cutting of common materials, the cladding light power is strongest at the starting position along the advancing direction of the laser, the intensity required to be corroded is weak, the cladding light pressure is gradually reduced along with the gradual stripping of the cladding light along the advancing direction of the laser, and the corrosion intensity is strong, so that the stripping intensity of the whole section of optical fiber is uniform, and the influence on the optical fiber output light spot caused by device burning or thermal stress problems due to local overheating can be avoided.
The reason for the bidirectional decrement is: when the laser output head is applied to cutting or welding of high-reflection materials, forward cladding light can be generated in the optical fiber, return light reflected back when the high-reflection materials are cut or welded by laser can be generated, the cladding light at two ends can be more, the depth to be corroded is a little, the middle position is gradually stripped along with the cladding light, the intensity of the cladding light is lower, the depth to be corroded can be stronger, the stripping intensity of the whole section of optical fiber is more uniform, and the influence on optical fiber output light spots caused by device burning or thermal stress problems due to local overheating can be avoided.
Based on the advantages and disadvantages of the above-mentioned corrosion method, in the present embodiment, the corrosion method of the optical fiber 210 is preferably a bidirectional decreasing time gradient corrosion method.
As shown in fig. 4 and 5, the protection device 300 includes an end cap holder 310, a lens member 320, and a light blocking member 330. Wherein the end cap holder 310 is fixed to an end of the quartz end cap 220 remote from the optical fiber 210 to hold the quartz end cap 220 and the first glass tube 230. The lens piece 320 is secured to the end of the end cap retainer 310 remote from the quartz end cap 220, that is, the end cap retainer 310 is secured between the lens piece 320 and the quartz end cap 220. The light blocking member 330 is fixed to an end of the first glass tube 230 remote from the quartz end cap 220 and is housed in the fiber fixing member 120. The light blocking member 330 is inclined (as an inclined surface D of the light blocking member 330 in fig. 5), and gradually decreases toward the quartz end cap 220, and the diameter of the interface at the side far away from the inner water-cooling channel is equal to the inner diameter of the optical fiber fixing member 120, so as to block the water path. In the present embodiment, the light blocking member 330 is located at the axial position of the thin through hole 122. Further, the cap holder 310, the lens element 320 and the light blocking member 330 in this embodiment are made of gold or silver (gold and silver) plating material with high thermal conductivity.
Further, the lens element 320 is a stepped cylindrical structure, and the steps toward the optical fiber 210 are gradually reduced, and the outer wall of each narrowed step surface can further play a role in blocking light.
Optionally, the protection device 300 further comprises a diaphragm 340 cooperating with the lens member 320. The diaphragm 340 is disposed on the stepped structure of the lens 320, and the diaphragm 340 has a diaphragm hole (not shown) for blocking the return light.
Further, the outer surface of the lens piece 320 is a gold-plated surface, and a part of return light can be blocked by the outer surface and the front end surface of the inner surface of the lens piece; the light barrier 330 is capable of reflecting and absorbing most of the return light remaining after passing through the first stripping area 260, which is the light transmitted through the coating, cladding and surface of the first glass tube 230 of the optical fiber 210 after entering the aperture.
During light return, the laser passes through the end face of the lens piece 320 to block light for the first time, the laser which is not blocked is sequentially blocked by the diaphragm and the outer wall of the step face of the quartz end cap 220, most of the returned light is stripped by the first stripping area, most of the leaked light is blocked by the light blocking piece 330, and the remaining returned light is absorbed by the thin through hole 122 of the optical fiber fixing piece 120.
Further, the protection device 300 further includes a thermistor 350, a temperature switch 360 electrically connected to the thermistor 350, and a photodetector 370. The thermistor 350 is two in number, and one of the thermistors 350 is installed at the outer sealing member 110 close to the fusion joint of the quartz end cap 220 and the optical fiber 210, and the reason why the thermistor 350 is installed at the fusion joint is that the fusion joint generates heat and is easily overheated. In a similar regard, another thermistor 350 is mounted on the outer cover 110 near the thin through hole 122 of the fiber holder 120. The temperature sensor 360 includes a temperature controlled switch. The temperature control switch is installed at the tail end of the optical fiber fixing member 120, and when the temperature is higher than a preset temperature value, the circuit is cut off, and when the temperature is lower than another preset temperature value, the circuit is automatically reconnected. Two photodetectors 370 are installed at the first and second stripping regions 260 and 270, respectively, to monitor the intensity of the stripping light and the intensity of the return light.
Specifically, the thermistor 350 can monitor the power of the light-emitting position in real time, when forward cladding light is not completely stripped, because the NA of the optical fiber cladding is larger than that of the fiber core (the NA of the fiber core is generally 0.06, 0.08, 0.12, 0.22, and the NA of the cladding is generally 0.46), the divergence angle of the cladding light is larger, and part of light hits the inner wall of the front end of the outer sealing member 110, so that the temperature is sharply increased, and the thermistor 350 can timely detect the temperature change and give an alarm or automatically power off.
When the forward laser light forms heat accumulation on the quartz end cap 220 due to dirt on the surface of the quartz end cap 220, the temperature of the quartz end cap 220 also rises sharply, and the thermistor 350 can detect the temperature change in time and give an alarm or automatically cut off the power.
When the cutting and welding are not completely cut or the welding is abnormal, the intensity of the return light is strong, the temperature of the front end of the outer sealing part 110 and the temperature of the light blocking part 330 are also increased rapidly, the thermistor 350 can detect the temperature change in time, and when the temperature reaches a certain threshold value, an automatic alarm or an automatic power off can be realized.
The two discrete contacts on the outer seal 110 can be conducted with each other only when the two discrete contacts are in good contact with the two interconnected contacts in the cutting head or the welding head after the two discrete contacts are assembled with the cutting head or the welding head, and the laser output head can be opened and normally works. If the laser output head is not assembled or assembled, the laser output head is in an open circuit state, and the laser output head cannot be normally started to emit light, so that the safety of a user is protected.
When the laser output head normally works, the light blocking piece 330 is just next to the highest temperature point at the front end of the outer sealing piece 110, when the quartz end cap 220 is burnt, the mould-peeling optical fiber 210 is burnt and the like is abnormal, the temperature at the position can be rapidly increased, and when the temperature reaches a certain value, the temperature control switch 360 can automatically cut off the power, so that the laser output head can be closed in time, and larger damage is avoided.
In this embodiment, the photo detector 370 is respectively disposed in the first mold stripping region 260 and the second mold stripping region 270, when the laser is turned on, the mold stripping optical fiber 210 will strip and scatter the cladding light, which can be detected by the photo detector 370, if the laser output head is abnormal, the laser output head is not normally illuminated after being turned on, and the photo detector 370 cannot detect the light, and will automatically alarm or automatically power off through the protection software of the laser output head, thereby avoiding further damage of the laser output head itself.
The laser output head that this embodiment provided, moreover, the steam generator is simple in structure, effectual reduce cost, there is cooling water between the outer wall through first glass pipe 230 and the extinction inner wall of optic fibre mounting 120, when playing the effect of sealing up water, the deformation stress that the deformation that the outer piece 110 that seals that can great buffering high expansion coefficient produced because expend with heat and contract with cold produces low expansion coefficient's first glass pipe 230 under cold and hot environment, in addition, the protection device 300 of laser output head can effectively support and keep out the return light or absorb laser, in order to reduce the harmful effects of return light to the device.
In addition, the invention also provides a laser, which comprises the laser output head in the embodiment, and the laser output head can effectively play roles in heat dissipation, back light blocking and back light absorption so as to reduce the adverse effect of the back light on the device.
While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. A laser output head, comprising:
an outer seal;
the optical fiber fixing piece is accommodated in the outer sealing piece;
the quartz end cap is in a step shape and is fixed in the end cap fixing piece, and the step bulge of the quartz end cap is partially inserted into the optical fiber fixing piece together with the end cap fixing piece;
the optical fiber is positioned in the optical fiber fixing piece and is welded with the stepped bulge of the quartz end cap;
the first glass tube is coated on the periphery of the optical fiber, one end of the first glass tube, which is close to the quartz end cap, is surrounded and fixed by the end cap fixing piece and is contained in the optical fiber fixing piece, so that an inner-layer water cooling channel is formed between the first glass tube and the optical fiber fixing piece;
and the light blocking piece is fixed in the optical fiber fixing piece and is clamped at one end, far away from the quartz end cap, of the first glass tube in a surrounding manner.
2. The laser output head as claimed in claim 1, wherein the light blocking member is inclined and gradually decreases toward the quartz end cap, and a cross-sectional diameter of the light blocking member at a side away from the quartz end cap is equal to an inner diameter of the optical fiber fixing member to block a water path.
3. The laser output head as claimed in claim 1, wherein the optical fiber forms a first stripping region near a position where the optical fiber is welded with the quartz end cap and is sleeved with a first glass tube; and one end of the optical fiber exposed out of the sealing piece forms a second mould stripping area, a second glass tube is sleeved on the second mould stripping area, and a metal shell is packaged outside the second glass tube.
4. The laser output head as claimed in claim 3, wherein the first glass tube is frosted or etched at a position corresponding to a stripping region of the optical fiber, wherein the first glass tube wraps the first stripping region of the optical fiber; and the position of the second glass tube, which wraps the second stripping area of the optical fiber, corresponds to the stripping position of the optical fiber, and is subjected to frosting treatment or corrosion treatment.
5. The laser output head as claimed in claim 1, wherein the optical fiber fixing member has a thin through hole communicating with the accommodating portion; the thin through hole is formed at the tail end of the accommodating part to absorb laser, the cross section diameter of the thin through hole is smaller than that of the accommodating part, and the optical fiber is inserted into the optical fiber fixing part from the thin through hole and extends out; the axial line position of the thin through hole and the axial line position of the light blocking piece are both located on the optical fiber.
6. The laser output head as claimed in claim 5, further comprising a buffer water-retaining ring, a waterproof gasket; the buffering water retaining ring is sleeved at one end, far away from the quartz end cap, of the optical fiber fixing piece and is connected with the optical fiber fixing piece in a sealing mode through the waterproof gasket.
7. The laser output head as claimed in claim 1, wherein one end of the optical fiber fixing member is located inside the outer sealing member, and the other end of the optical fiber fixing member extends out of the outer sealing member; the outer seal comprises a water inlet and a water outlet; and cooling water enters from the water inlet, flows into the outer water-cooling channel between the optical fiber fixing piece and the outer sealing piece, flows into a gap between the optical fiber fixing piece and the quartz end cap, further enters the inner water-cooling channel formed between the first glass tube and the optical fiber fixing piece, and flows out from the water outlet.
8. The laser output head as claimed in claim 1, wherein the inner wall of the optical fiber fixing member has a double-layer water channel structure, and grooves or threads are formed on the inner side and/or the outer side of the wall of the optical fiber fixing member to increase the cold water contact surface.
9. The laser output head as set forth in claim 5, further comprising two temperature controlled switches electrically connected to the thermistors; one thermistor is arranged at the position, close to the fusion joint of the quartz end cap and the optical fiber, of the outer sealing piece, and the other thermistor is arranged at the position, close to the thin through hole of the optical fiber fixing piece, of the outer sealing piece; the temperature control switch is arranged at the position, far away from the quartz end cap, of the optical fiber fixing piece so as to control the circuit to be cut off or reconnected.
10. A laser comprising a laser output head as claimed in any one of claims 1 to 9.
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| CN201810001718.0A CN109994918B (en) | 2018-01-02 | 2018-01-02 | Laser output head and laser with same |
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| CN201810001718.0A CN109994918B (en) | 2018-01-02 | 2018-01-02 | Laser output head and laser with same |
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| CN109994918B CN109994918B (en) | 2020-06-26 |
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| CN113067236A (en) * | 2021-02-24 | 2021-07-02 | 武汉锐科光纤激光技术股份有限公司 | Laser output head |
| CN114865429A (en) * | 2022-07-06 | 2022-08-05 | 光越科技(深圳)有限公司 | Laser output head and laser output equipment |
| CN117954946A (en) * | 2024-03-26 | 2024-04-30 | 北京凯普林光电科技股份有限公司 | Laser output head and laser output device |
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