Energy transfer laser output head and working method thereof

Abstract

The invention relates to an energy transfer laser output head and a working method thereof, the energy transfer laser output head comprises a shell 1, a first output optical fiber 2 and a quartz end cap 3 are arranged in the shell 1, and an increasing lens 4 is arranged at the end part of the shell 1; wherein one side of the tip end of the quartz end cap 3 is connected with the first output optical fiber 2, and one side of the flat end of the quartz end cap 3 is close to the lens increasing lens 4; the inner side, close to the quartz end cap 3, of the anti-reflection lens 4 is plated with an anti-reflection film 401, and the anti-reflection film 401 allows dominant wavelength output light and Raman scattering light to pass through; a reflecting film 402 is plated on the outer side, far away from the quartz end cap 3, of the enhancement lens 4, and the reflecting film 402 is used for reflecting Raman scattering light. The reflecting film 402 is arranged on the outer side of the increasing lens 4, so that the output Raman scattering light is reflected back into the output head, the Raman scattering light is prevented from being output to the cutting head, and therefore the cutting head is protected and prevented from being damaged.

Description

Technical Field

[0001] The present invention relates to the field of laser technology, and in particular to an energy transmission laser output head and a working method thereof. Background Art

[0002] In the field of industrial lasers, high-power processing applications corresponding to high-power lasers are pursued. Generally speaking, high-power continuous lasers generally use double-clad optical fibers fused with quartz end caps to make output head devices for power beam expansion, and the laser is transmitted to the cutting head for collimated and focused cutting. However, under the condition of high-power output, Raman scattered light will be generated, and Raman scattered light will be output through the fiber core like the main wavelength light.

[0003] During industrial processing, depending on the material being processed, especially when cutting high-reflectivity materials, the output laser is prone to return and enter the output optical cable of the laser, causing failure or damage to the device or even the entire machine. In addition, the lens coating of the cutting head is basically only coated with a film that matches the wavelength of the main wavelength output light, so when there is too much Raman scattered light emitted from the output head, it is easy to cause damage to the cutting head. The cutting head is generally expensive, and the loss after damage is large.

[0004] The existing technology of domestic lasers is to filter out the cladding fiber near the output end of the output optical cable. This method can only filter out the cladding light (the cladding light is the pump light of other wavelengths). When the power of the return light is not large, it can meet the demand for filtering out the return light. However, due to the limited water cooling effect of the output optical cable, when the processing object is a thick and highly reflective material, the laser needs to operate at a high power level of more than 10,000 watts. Under this level of high power operation, Raman scattered light will be generated in the fiber core. The Raman scattered light is output together with the main wavelength light through the fiber core, and the Raman scattered light in the fiber core cannot be stripped. In this case, there will be two problems: First, the power of the return light will be very large. If the original filtering process is still used, when the main wavelength output light plus the Raman scattered light reaches the high reflectivity material being cut, it will be returned to the laser system through the cutting head transmission cable, causing the output head to bear more energy from the return light, and the rear laser cable will affect the use effect after receiving too much return light, which will inevitably affect the life of the laser system. Second, when there is too much Raman scattered light emitted from the output head, it is easy to cause damage to the cutting head.

[0005] In view of this, how to overcome the defects of the above-mentioned prior art and how to solve at least one of the above-mentioned technical problems is a difficult problem to be solved urgently in the field of this technology. Summary of the invention

[0006] In order to solve the above technical problems or needs, the present invention provides an energy transmission laser output head and a working method thereof, which reflects Raman scattered light by setting an amplification lens and a reflective film on the outside of the amplification lens, so that the output Raman scattered light is reflected back into the output head, preventing the Raman scattered light from being output to the cutting head, thereby protecting the cutting head and preventing the cutting head from being damaged.

[0007] The present invention is achieved in that:

[0008] In a first aspect, the present invention provides an energy transmission laser output head, comprising a housing 1, wherein a first output optical fiber 2 and a quartz end cap 3 are arranged in the housing 1, and an amplification lens 4 is arranged at the end of the housing 1; wherein:

[0009] The tip end of the quartz end cap 3 is connected to the first output optical fiber 2, and the flat end of the quartz end cap 3 is close to the amplification lens 4;

[0010] The inner side of the enhancement lens 4 close to the quartz end cap 3 is coated with an anti-reflection film 401, and the anti-reflection film 401 allows the main wavelength output light and the Raman scattered light to pass through; the outer side of the enhancement lens 4 away from the quartz end cap 3 is coated with a reflective film 402, and the reflective film 402 is used to reflect the Raman scattered light.

[0011] In some embodiments, the quartz end cap 3 includes a first division 301, a second division 302 and a third division 303 arranged in sequence; the first division 301 and the second division 302 are cylindrical, the diameter of the second division 302 is smaller than the diameter of the first division 301, the third division 303 is conical, and the maximum diameter of the third division 303 is smaller than the diameter of the second division 302; the first division 301, the second division 302 and the third division 303 are an integrated structure.

[0012] In some embodiments, the shell 1 is provided with a first cavity 101, a second cavity 102 and a third cavity 103 which are connected in sequence. The first cavity 101 is cylindrical, the second cavity 102 is truncated cone, and the third cavity 103 is cylindrical. The diameter of the first cavity 101 is greater than the diameter of the third cavity 103. The diameter of one end of the second cavity 102 is the same as the diameter of the first cavity 101, and the diameter of the other end of the second cavity 102 is the same as the diameter of the third cavity 103; the diameter of the first cavity 101 is the same as the diameter of the first division 301, and the diameter of the third cavity 103 is the same as the diameter of the second division 302; the first division 301 is arranged in the first cavity 101, a part of the second division 302 is arranged in the second cavity 102, another part of the second division 302 is arranged in the third cavity 103, and the third division 303 is arranged in the third cavity 103.

[0013] In some embodiments, the end face connecting the first section 301 and the second section 302 is set to a frosted surface with a preset refractive index, and the inner wall of the second cavity 102 is a nickel-plated frosted surface with low reflectivity; the returned main wavelength output light and Raman scattered light are refracted to the inner wall of the second cavity 102 through the end face connecting the first section 301 and the second section 302, and the light is absorbed by the low-reflectivity surface of the inner wall of the second cavity 102 and converted into heat and carried away.

[0014] In some embodiments, the end face connecting the second section 302 and the third section 303 is set as a frosted surface with a preset refractive index, and the inner wall of the third cavity 103 is a nickel-plated frosted surface with low reflectivity; the returned main wavelength output light and Raman scattered light are refracted to the inner wall of the third cavity 103 through the end face connecting the second section 302 and the third section 303, and the light is absorbed by the low reflectivity surface of the inner wall of the third cavity 103 and converted into heat and taken away.

[0015] In some embodiments, the inner wall of the third cavity 103 is configured to be threaded, and a reflective gasket 6 is disposed at the end of the third cavity 103 , and the reflective gasket 6 is plated with a high-reflective film.

[0016] In some embodiments, the shell 1 includes an inner shell 104 and an outer shell 105, and a water cooling channel 106 is set between the inner shell 104 and the outer shell 105; a water inlet 107 is set on one side of the outer shell 105, and the water inlet 107 is connected to the water cooling channel 106; a water outlet 108 is set on the other side of the outer shell 105, and the water outlet 108 is connected to the water cooling channel 106.

[0017] In some embodiments, a section of the first output optical fiber 2 located in the third cavity 103 is stripped of its coating layer, and a cladding surface of the first output optical fiber 2 is roughened.

[0018] In some embodiments, the end surface of the shell 1 is gold-plated.

[0019] In a second aspect, the present invention provides a working method of an energy transmission laser output head, which is applied to the energy transmission laser output head described in the first aspect, and the method comprises:

[0020] The main wavelength output light and Raman scattered light output from the first output optical fiber 2 pass through the quartz end cap 3 and reach the amplifying lens 4. The main wavelength output light passes through the amplifying lens 4 and is emitted to the target. The Raman scattered light is reflected back to the inside of the output head by the reflective film 402 outside the amplifying lens 4, and is refracted toward the inner wall of the housing 1 at the end face of the quartz end cap 3, and is absorbed by the inner wall of the housing 1 and converted into heat and taken away.

[0021] The main wavelength output light reflected from the target passes through the amplifying lens 4 and is refracted toward the inner wall of the housing 1 at the end surface of the quartz end cap 3, and is absorbed by the inner wall of the housing 1 and converted into heat to be taken away.

[0022] Compared with the prior art, the beneficial effects of the present invention are: providing an energy transmission laser output head and a working method thereof, by providing an amplification lens and a reflective film on the outside of the amplification lens to reflect Raman scattered light, so that the output Raman scattered light is reflected back into the output head, preventing the Raman scattered light from being output to the cutting head, thereby protecting the cutting head and preventing the cutting head from being damaged.

[0023] Furthermore, the end face of the quartz end cap is set to a frosted surface with a preset refractive index, and the inner wall of the shell is set to a nickel-plated frosted surface with a low reflectivity, so that the main wavelength output light and Raman scattered light in the returned light are refracted toward the inner wall of the shell at the end face of the quartz end cap, and then the main wavelength output light and Raman scattered light in the returned light are absorbed by the inner wall of the shell and converted into heat and taken away. This setting can reduce the accumulated returned light energy borne by the output head and greatly reduce the amount of light returned to the rear laser optical cable, thereby ensuring a good service life of the laser system. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1A partial cross-sectional schematic diagram of an energy transmission laser output head provided by an embodiment of the present invention;

[0026] Figure 2 A schematic cross-sectional view of an enhancement lens provided by an embodiment of the present invention;

[0027] Figure 3 A schematic diagram of a water cooling channel provided in an embodiment of the present invention;

[0028] Figure 4 A schematic diagram of a quartz end cap structure provided by an embodiment of the present invention;

[0029] Figure 5 An enlarged schematic diagram of a quartz end cap provided in an embodiment of the present invention disposed in a cavity inside a housing;

[0030] Figure 6 A complete cross-sectional schematic diagram of an energy transfer laser output head provided by an embodiment of the present invention;

[0031] Figure 7 A schematic diagram of the working process of the energy transmission laser output head provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0032] Unless the context requires otherwise, throughout the specification and claims, the term "including" is to be interpreted as open inclusion, that is, "including, but not limited to". In the description of the specification, the terms "one embodiment", "some embodiments", "exemplary embodiments", "examples", "specific examples" or "some examples" and the like are intended to indicate that specific features, structures, materials or characteristics associated with the embodiment or example are included in at least one embodiment or example of the present disclosure. The schematic representation of the above terms does not necessarily refer to the same embodiment or example. In addition, the specific features, structures, materials or characteristics may be included in any one or more embodiments or examples in any appropriate manner, that is, although they may be carried in the embodiments or examples of the above terms due to reasons such as the order and position of appearance, it is not limited to that they can be carried in combination by one embodiment or example.

[0033] In the description of the present invention, the terms "inside", "outside", "longitudinal", "lateral", "up", "down", "left", "right", "top", "bottom" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and do not require that the present invention must be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the present invention.

[0034] The present invention is described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those of ordinary skill in the art, several variations and improvements may be made without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0035] It should be noted that, if there is no conflict, the various features in the embodiments of the present invention can be combined with each other, all within the scope of protection of this application. Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as those commonly understood by technicians in the technical field of the present invention. The terms and directions used in this specification are only for the purpose of describing specific implementation methods and are not intended to limit the present invention.

[0036] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0037] Example 1

[0038] refer to Figure 1 and Figure 2 As shown, embodiment 1 of the present invention provides an energy transmission laser output head, including a housing 1, wherein a first output optical fiber 2 and a quartz end cap 3 are arranged in the housing 1, and an amplifying lens 4 is arranged at the end of the housing 1; wherein: the tip side of the quartz end cap 3 is connected to the first output optical fiber 2, and the flat end side of the quartz end cap 3 is close to the amplifying lens 4; the amplifying lens 4 is coated with an anti-reflection film 401 on the inner side close to the quartz end cap 3, and the anti-reflection film 401 allows the main wavelength output light and Raman scattered light to pass through; the amplifying lens 4 is coated with a reflective film 402 on the outer side away from the quartz end cap 3, and the reflective film 402 is used to reflect the Raman scattered light. By arranging the amplifying lens 4 and arranging the reflective film 402 on the outer side of the amplifying lens 4, the Raman scattered light is reflected, so that the output Raman scattered light is reflected back into the output head, and the Raman scattered light is prevented from being output to the cutting head, thereby protecting the cutting head and preventing the cutting head from being damaged.

[0039] It should be noted that the anti-reflection film 401 is a coating that matches the wavelength of the main wavelength output light. For example, if the wavelength of the main wavelength output light is 1080nm, then the anti-reflection film 401 is a 1080nm coating. The reflective film 402 is a coating that matches the wavelength of the Raman scattered light. For example, if the wavelength of the Raman scattered light is 1135nm, then the reflective film 402 is a 1135nm high-reflective coating, that is, all the Raman scattered light of the wavelength of 1135nm is reflected back and prevented from entering the cutting head; of course, the effect of the reflective film 402 may not be able to achieve 100% reflection, and it only needs to be able to reflect most of the Raman scattered light.

[0040] refer to Figure 3 As shown, in some embodiments, the housing 1 includes an inner shell 104 and an outer shell 105, and a water cooling channel 106 is set between the inner shell 104 and the outer shell 105; a water inlet 107 is set on one side of the outer shell 105, and the water inlet 107 is connected to the water cooling channel 106; a water outlet 108 is set on the other side of the outer shell 105, and the water outlet 108 is connected to the water cooling channel 106. Under the above settings, the inner shell 104, that is, the water cooling body, when the water cooling work is carried out, water enters from the water inlet 107, and the water flow wraps the inner shell 104, that is, the water cooling body, takes away the heat of the water cooling body, and the water is discharged from the water outlet 108; in the process of water inlet and water outlet, the heat of the water cooling body is continuously taken away to realize the heat dissipation process. Preferably, the water inlet 107 and the water outlet 108 select a large flow water inlet seat with a diameter of 6mm to increase the water flow rate and accelerate the heat dissipation speed.

[0041] refer to Figure 4 As shown, in some embodiments, the quartz end cap 3 includes a first sub-section 301, a second sub-section 302 and a third sub-section 303 arranged in sequence; the first sub-section 301 and the second sub-section 302 are cylindrical, the diameter of the second sub-section 302 is smaller than the diameter of the first sub-section 301, the third sub-section 303 is conical, and the maximum diameter of the third sub-section 303 is smaller than the diameter of the second sub-section 302; the first sub-section 301, the second sub-section 302 and the third sub-section 303 are an integrated structure, and the first sub-section 301, the second sub-section 302 and the third sub-section 303 are coaxially arranged. In some embodiments, the edges of the quartz end cap 3 are all chamfered.

[0042] refer to Figure 5As shown, in some embodiments, the shell 1 is provided with a first cavity 101, a second cavity 102 and a third cavity 103 which are connected in sequence, the first cavity 101 is cylindrical, the second cavity 102 is truncated cone, the third cavity 103 is cylindrical, the diameter of the first cavity 101 is larger than the diameter of the third cavity 103, the diameter of one end of the second cavity 102 is the same as the diameter of the first cavity 101, and the diameter of the other end of the second cavity 102 is the same as the diameter of the third cavity 103; the diameter of the first cavity 101 is the same as the diameter of the first division 301, and the diameter of the third cavity 103 is the same as the diameter of the second division 302; the first division 301 is arranged in the first cavity 101, a part of the second division 302 is arranged in the second cavity 102, another part of the second division 302 is arranged in the third cavity 103, and the third division 303 is arranged in the third cavity 103. In some embodiments, the inner wall of the third cavity 103 is configured to be threaded, that is, the inner wall of the water-cooling body is newly provided with internal threads instead of the original smooth surface. By providing the internal threads, the light absorption area can be increased and the heat dissipation capacity can be enhanced. Optionally, the thread is M8 and the pitch is 1.2 mm.

[0043] In some embodiments, the end face connecting the first subdivision 301 and the second subdivision 302 is set as a frosted surface with a preset refractive index. Specifically, the frosted surface can be a frosted surface with 200 mesh fine grinding, glossiness 0.85, and refractive index 1.5, thereby forming refraction, and refracting the returned light to the nickel-plated layer of the water-cooled main body. The inner wall of the second cavity 102 is a nickel-plated frosted surface with low reflectivity. Specifically, the nickel-plated frosted surface can be electroplated, and the nickel plating is a matte dark gray frosted surface with a glossiness of 0.85 and a nickel plating thickness of 25μm. The light is absorbed by the low-reflectivity surface and converted into heat and taken away. The returned main wavelength output light and Raman scattered light are refracted to the inner wall of the second cavity 102 through the end face connecting the first subdivision 301 and the second subdivision 302, and the light is absorbed by the low-reflectivity surface of the inner wall of the second cavity 102 and converted into heat and taken away.

[0044] In some embodiments, the end face connecting the second subsection 302 and the third subsection 303 is set as a frosted surface with a preset refractive index. Specifically, the frosted surface can be a frosted surface with 200 mesh fine grinding, glossiness of 0.85, and refractive index of 1.5, thereby forming refraction, and refracting the returned light to the nickel-plated layer of the water-cooled main body. The inner wall of the third cavity 103 is a nickel-plated frosted surface with low reflectivity. Specifically, the nickel-plated frosted surface can be electroplated, and the nickel plating is a matte dark gray frosted surface with a glossiness of 0.85 and a nickel plating thickness of 25μm. The light is absorbed by the low-reflectivity surface and converted into heat and taken away. The returned main wavelength output light and Raman scattered light are refracted to the inner wall of the third cavity 103 through the end face connecting the second subsection 302 and the third subsection 303, and the light is absorbed by the low-reflectivity surface of the inner wall of the third cavity 103 and converted into heat and taken away.

[0045] refer to Figure 5 As shown, in some embodiments, a reflective gasket 6 is provided at the end of the third cavity 103, and the center of the reflective gasket 6 is used to pass through the first output optical fiber 2 and fix the first output optical fiber 2; in addition, the reflective gasket 6 is plated with a high reflective film on the side facing the quartz end cap 3, which is used to reflect the return light from the quartz end cap 3 to the end of the third cavity 103 to the inner wall of the third cavity 103, and then cooperate with the thread design of the inner wall of the third cavity 103 to better absorb and dissipate light. Preferably, the side of the reflective gasket 6 facing the quartz end cap 3 can be set to an arc shape, so as to better reflect the light directly incident on the reflective gasket 6 to the threaded inner wall of the third cavity 103.

[0046] In some embodiments, the entire inner shell 104, ie, the water-cooling body, can be configured as a nickel-plated frosted surface with low reflectivity, so as to absorb light through the low reflectivity surface and convert the light into heat, and then remove the heat through the water cooling process.

[0047] Specifically, in some embodiments, the material of the quartz end cap 3 is Suprasil 300 (Heraeus). The polishing requirements of the quartz end cap 3 include: the end surface of the first subsection 301 away from the second subsection 302 and the end surface of the third subsection 303 away from the second subsection 302 are ultra-smooth polished, the side surface of the first subsection 301, the side surface of the second subsection 302, and the side surface of the third subsection 303 are finely ground with 500-mesh sand, and the connecting end surface of the first subsection 301 and the second subsection 302 and the connecting end surface of the second subsection 302 and the third subsection 303 are finely ground with 200-mesh sand.

[0048] In some embodiments, the surface of the end of the shell 1 is gold-plated, and the electroplating process is: the surface is gold-plated with 20 μm and the roughness is 0.4; the heat absorbed by the light is reduced by the smooth surface, thereby reducing the surface temperature of the output head.

[0049] In some embodiments, the coating layer of the first output optical fiber 2 is stripped off at a section in the third cavity 103, and the cladding surface of the first output optical fiber 2 is roughened. The pump light is dispersed by stripping the optical fiber cladding and corroding and roughening, and the dispersed pump light is absorbed by the inner shell 104, i.e., the water-cooled body, and converted into heat, and then the heat is taken away by the water cooling process.

[0050] Based on the above configuration, the end surface connecting the first subsection 301 and the second subsection 302 is called a large table surface, the end surface connecting the second subsection 302 and the third subsection 303 is called a small circular table surface, and the end surface of the third subsection 303 is called a welding table surface. Then, the reflected light of the large circular table surface will be incident on the water-cooled inclined surface of the second cavity 102 and absorbed, and part of the reflected light of the small circular table surface and the welding table surface will be returned to the inner wall of the thread of the third cavity 103 by the reflective gasket 6 coated with a high-reflective film and absorbed. For the welding table, for example, its diameter is 1200um, and the fiber specification is 100 / 360 (core diameter / cladding diameter), which means that the fiber core diameter is 100um and the cladding diameter is 360um; the 360um end face and the 1200um are welded with unequal diameters. In this way, when the laser is output, the laser is output from the 100 / 360 optical fiber through the cutting head to the surface of the high-reflective material. The high-reflective material has a smooth surface and high reflectivity, and the main wavelength light beam is returned along the original path. The 1200um return light returned by the welding table enters the 360mm optical fiber, so the outer circle of light will inevitably be transmitted to the third cavity 103. The reflective gasket 6 is used to reflect these The residual return light on the welding table is absorbed by the low-refractive index surface material in the threaded cavity and converted into heat and taken away by water cooling. Therefore, only 360um of the return light can finally return to the optical fiber, and the 360um optical fiber has undergone a 4cm long coating stripping and corrosion to destroy the cladding in the third cavity 103. In this way, most of the residual light on the periphery of the 360um optical fiber will be refracted into the threaded cavity and converted into heat and taken away by water cooling. Only a small part of the return light still exists in the 100um fiber core and the roughened cladding. The energy of this part of the return light has been reduced to the extreme and has almost no effect, so that the above-mentioned setting can finally achieve the effect of almost completely absorbing the return light.

[0051] refer to Figure 6As shown, the laser output by the laser output module is transmitted through the core of the second output optical fiber 5, a section of the second output optical fiber 5 is stripped of the coating layer, and the surface of the second cladding is roughened, and this section of the second output optical fiber 5 is used as the first optical fiber roughening area to filter out the cladding light in the optical fiber, the end of the second output optical fiber 5 is fused with the first output optical fiber 2 of the output optical cable, and the end of the first output optical fiber 2 is fused with the quartz end cap 3, a section of the first output optical fiber 2 is stripped of the coating layer, and the surface of the third cladding is roughened, and this section of the first output optical fiber 2 is used as the second optical fiber roughening area to filter out the cladding light in the optical fiber. In the above configuration, the second output optical fiber 5 is a double-clad optical fiber, and the first output optical fiber 2 is a triple-clad optical fiber.

[0052] In summary, the embodiment of the present invention provides an energy transmission laser output head, which reflects the returned Raman scattered light by setting an amplifying lens and a reflective film on the outside of the amplifying lens, so that the returned Raman scattered light cannot enter the output head, and reflects the Raman scattered light, so that the output Raman scattered light is reflected back into the output head, and the Raman scattered light is prevented from being output to the cutting head, thereby protecting the cutting head and preventing the cutting head from being damaged. Furthermore, the end face of the quartz end cap is set to a frosted surface with a preset refractive index, and the inner wall of the shell is set to a nickel-plated frosted surface with a low reflectivity, so that the main wavelength output light and Raman scattered light in the returned light are refracted toward the inner wall of the shell at the end face of the quartz end cap, and then the main wavelength output light and Raman scattered light in the returned light are absorbed by the inner wall of the shell and converted into heat and taken away. This setting can reduce the accumulated returned light energy borne by the output head, and greatly reduce the amount of light returned to the rear laser optical cable, thereby ensuring a good service life of the laser system.

[0053] Example 2

[0054] refer to Figure 7 As shown, based on the energy transmission laser output head provided in Example 1, the embodiment of the present invention further provides a working method of the energy transmission laser output head, which is applied to the energy transmission laser output head described in Example 1, and the method includes the following process:

[0055] Step 100: The main wavelength output light and Raman scattered light output from the first output optical fiber 2 pass through the quartz end cap 3 and arrive at the amplifying lens 4. The main wavelength output light passes through the amplifying lens 4 and is emitted to the target; the Raman scattered light is reflected back to the inside of the output head by the reflective film 402 on the outside of the amplifying lens 4, refracted to the inner wall of the shell 1 at the end face of the quartz end cap 3, absorbed by the inner wall of the shell 1 and converted into heat to be taken away. For example, the wavelength of the Raman scattered light is 1135nm. When cutting high-reflectivity materials, the 1135nm Raman scattered light output from the first output optical fiber 2 will be reflected by the reflective film 402, re-emitted to the inside of the output head, and then refracted to the inner wall of the shell 1 at the end face of the quartz end cap 3, absorbed by the inner wall of the shell 1 and converted into heat to be taken away; this setting avoids the consequences of Raman scattered light damaging the cutting head. The main wavelength output light output from the first output optical fiber 2 can continue to be emitted to the target of the high-reflectivity material after passing through the amplifying lens 4.

[0056] Step 200: The main wavelength output light reflected from the target passes through the amplifying lens 4, and is refracted toward the inner wall of the housing 1 at the end face of the quartz end cap 3, and is absorbed by the inner wall of the housing 1 and converted into heat and taken away. For example, the wavelength of the main wavelength output light is 1080nm, and the 1080nm light can return from the outside of the amplifying lens 4 to the inside of the amplifying lens 4, but after the 1080nm light returns to the quartz end cap 3, most of the 1080nm light is refracted toward the inner wall of the housing 1 by the frosted end face of the quartz end cap 3, and the inner wall of the housing 1 is a nickel-plated frosted surface with a low reflectivity surface, which can absorb light well and convert the light into heat, and then take it away through the water cooling process.

[0057] Specifically, the detailed structural description of the energy transfer laser output head has been described in Example 1, and will not be repeated here.

[0058] In summary, the embodiment of the present invention provides a working method of an energy transmission laser output head, by setting an amplification lens and setting a reflective film on the outside of the amplification lens to reflect the Raman scattered light, so that the output Raman scattered light is reflected back into the output head, and the Raman scattered light is prevented from being output to the cutting head, thereby protecting the cutting head and preventing the cutting head from being damaged. Furthermore, the end face of the quartz end cap is set to a frosted surface with a preset refractive index, and the inner wall of the shell is set to a nickel-plated frosted surface with a low reflectivity, so that the main wavelength output light and Raman scattered light in the returned light are refracted toward the inner wall of the shell at the end face of the quartz end cap, and then the main wavelength output light and Raman scattered light in the returned light are absorbed by the inner wall of the shell and converted into heat and taken away. This setting can reduce the accumulated returned light energy borne by the output head, and greatly reduce the amount of light returned to the rear laser optical cable, thereby ensuring a good service life of the laser system.

[0059] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them. Under the concept of the present invention, the technical features in the above embodiments or different embodiments may also be combined, the steps may be implemented in any order, and there are many other changes in different aspects of the present invention as described above, which are not provided in detail for the sake of simplicity. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An energy transmission laser output head, characterized in that: It comprises a housing (1), a first output optical fiber (2) and a quartz end cap (3) are arranged in the housing (1), and an amplification lens (4) is arranged at the end of the housing (1); wherein: The tip side of the quartz end cap (3) is connected to the first output optical fiber (2), and the flat end side of the quartz end cap (3) is close to the amplification lens (4); The amplifying lens (4) is coated with an anti-reflection film (401) on the inner side close to the quartz end cap (3), and the anti-reflection film (401) allows the main wavelength output light and the Raman scattered light to pass through; the amplifying lens (4) is coated with a reflective film (402) on the outer side away from the quartz end cap (3), and the reflective film (402) is used to reflect the Raman scattered light.

2. The energy transfer laser output head according to claim 1, characterized in that: The quartz end cap (3) comprises a first section (301), a second section (302) and a third section (303) which are arranged in sequence; the first section (301) and the second section (302) are cylindrical, the diameter of the second section (302) is smaller than the diameter of the first section (301), the third section (303) is conical, and the maximum diameter of the third section (303) is smaller than the diameter of the second section (302); the first section (301), the second section (302) and the third section (303) are an integrated structure.

3. The energy transmission laser output head according to claim 2, characterized in that: The shell (1) is provided with a first cavity (101), a second cavity (102) and a third cavity (103) which are connected in sequence; the first cavity (101) is cylindrical, the second cavity (102) is truncated cone-shaped, the third cavity (103) is cylindrical, the diameter of the first cavity (101) is greater than the diameter of the third cavity (103), the diameter of one end of the second cavity (102) is the same as the diameter of the first cavity (101), and the diameter of the other end of the second cavity (102) is the same as the diameter of the third cavity (103). 3); the diameter of the first cavity (101) is the same as the diameter of the first subdivision (301), and the diameter of the third cavity (103) is the same as the diameter of the second subdivision (302); the first subdivision (301) is arranged in the first cavity (101), a part of the second subdivision (302) is arranged in the second cavity (102), another part of the second subdivision (302) is arranged in the third cavity (103), and the third subdivision (303) is arranged in the third cavity (103).

4. The energy transmission laser output head according to claim 3, characterized in that: The end surface connecting the first subsection (301) and the second subsection (302) is arranged as a frosted surface with a preset refractive index, and the inner wall of the second cavity (102) is a nickel-plated frosted surface with a low reflectivity; the returned main wavelength output light and Raman scattered light are refracted to the inner wall of the second cavity (102) through the end surface connecting the first subsection (301) and the second subsection (302), and the light is absorbed by the low reflectivity surface of the inner wall of the second cavity (102) and converted into heat and carried away.

5. The energy transmission laser output head according to claim 3, characterized in that: The end surface connecting the second subsection (302) and the third subsection (303) is arranged as a frosted surface with a preset refractive index, and the inner wall of the third cavity (103) is a nickel-plated frosted surface with a low reflectivity; the returned main wavelength output light and Raman scattered light are refracted to the inner wall of the third cavity (103) through the end surface connecting the second subsection (302) and the third subsection (303), and the light is absorbed by the low reflectivity surface of the inner wall of the third cavity (103) and converted into heat and carried away.

6. The energy transmission laser output head according to claim 3, characterized in that: The inner wall of the third cavity (103) is arranged in a threaded shape, and a reflective gasket (6) is arranged at the end of the third cavity (103), and a high-reflective film is plated on the reflective gasket (6).

7. The energy transfer laser output head according to any one of claims 1 to 6, characterized in that: The shell (1) comprises an inner shell (104) and an outer shell (105), wherein a water cooling channel (106) is arranged between the inner shell (104) and the outer shell (105); a water inlet (107) is arranged on one side of the outer shell (105), and the water inlet (107) is connected to the water cooling channel (106); and a water outlet (108) is arranged on the other side of the outer shell (105), and the water outlet (108) is connected to the water cooling channel (106).

8. The energy transmission laser output head according to any one of claims 1 to 6, characterized in that: A section of the first output optical fiber (2) located in the third cavity (103) has its coating stripped off, and a cladding surface of the first output optical fiber (2) has been roughened.

9. The energy transmission laser output head according to any one of claims 1 to 6, characterized in that: The end surface of the shell (1) is gold-plated.

10. A working method of an energy transfer laser output head, applied to the energy transfer laser output head according to any one of claims 1 to 9, characterized in that: include: The main wavelength output light and the Raman scattered light output from the first output optical fiber (2) pass through the quartz end cap (3) and arrive at the amplifying lens (4), and the main wavelength output light passes through the amplifying lens (4) and is emitted toward the target; the Raman scattered light is reflected back to the inside of the output head by the reflective film (402) on the outside of the amplifying lens (4), and is refracted toward the inner wall of the shell (1) at the end face of the quartz end cap (3), and is absorbed by the inner wall of the shell (1) and converted into heat and carried away; The main wavelength output light reflected from the target passes through the amplifying lens (4), is refracted toward the inner wall of the shell (1) at the end surface of the quartz end cap (3), is absorbed by the inner wall of the shell (1) and converted into heat to be carried away.

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