CN220753996U - Multi-tail fiber output laser pumping source - Google Patents

Abstract

The utility model relates to the field of laser pumping sources, and discloses a laser pumping source with multi-tail fiber output, which comprises a plurality of light source modules, first collimating lenses, second collimating lenses, first reflecting mirrors, lens components (optical filters, first focusing lenses, energy beam splitters), first transmission fibers and second transmission fibers, wherein the number of the first collimating lenses, the number of the second collimating lenses, the number of the first reflecting mirrors, the number of the lens components (optical filters, the first focusing lenses, the number of the energy beam splitters) are the same as that of the light source modules. Compared with the first traditional independent supply mode, the utility model ensures the uniformity of the working current of the chip, when high-frequency work no longer occurs, the utility model adopts the space design of refraction and reflection coupling, the space is no longer compact, the radiating metal volume is large, thereby greatly reducing the failure rate, the output brightness is high, the temperature of the laser pump beam combiner is low, the coupling efficiency between the pump source and the beam combiner is improved, and compared with the second traditional supply mode, the utility model uses a uniform focusing light path, can reduce the number of laser chips, avoid energy waste and reduce the production cost.

Description

Multi-tail fiber output laser pumping source

Technical Field

The utility model relates to the field of laser pumping sources, in particular to a multi-tail fiber output laser pumping source.

Background

Laser marking is the most advanced technology of industrial product marking in the world at present, has become an effective marking processing method increasingly, with the continuous development in the industrial field, the fiber pulse laser is taken as the main body of the industrial laser, and the application market is also increased. The optical fiber pulse laser has the advantages of low cost, high efficiency, energy conservation, high reliability, compact structure, convenient application and the like. As the most core device of the optical fiber pulse laser, part of enterprises continuously explore and break through in the aspects of high cost performance, high working time and high brightness in the design of pump sources.

The existing optical fiber pulse laser is generally divided into three parts, namely a pulse generation optical path, a pulse amplification optical path and a pulse output optical path. The laser power is determined by the pulse amplification light path, and is generally divided into primary amplification, secondary amplification or more secondary amplification, and for the fiber pulse laser with the marking market share reaching 70%, the primary amplification is mostly performed. The laser pump source is designed around the first two parts (pulse generation optical path and pulse amplification optical path), and the two parts pump sources respectively supply energy to the two optical paths. Monopulse energy = average power divided by repetition frequency, peak power = monopulse energy divided by pulse width. When the fiber pulse laser is used at high frequency, if the average power is unchanged, the pulse energy can be reduced, the pulse width can be widened along with the pulse width, then the peak power can be reduced, and the problems of insufficient marking strength and the like are caused. When some enterprises manufacture products, in a high-frequency section, working current can be increased, laser pumping power is increased, and average power is improved so as to maintain high-level marking strength. The pump source design is more required, and the requirements of higher output energy, high working time length, high brightness and the like are met.

For the pulse generation optical path, the pump sources are generally divided into two types, namely a single-chip pump source and a double-chip pump source.

The single-chip pump source is used for ensuring pulse energy and continuously improving current to the upper working limit at high frequency, so that the junction temperature of the pump chip is too high. And the output brightness is low, and the temperature of the laser pump beam combiner is increased. But due to low cost, most enterprises still adopt the design scheme.

The inverted double-chip pumping source has the advantages that the working current is only half of that of a single-chip pumping source, refraction and reflection coupling are adopted, the return light of the lens is small, the heat dissipation metal is large, more pumping energy can be provided, and the failure rate of the chip is greatly reduced. Due to the refraction and reflection coupling scheme, the output brightness of the pumping source is high, and the temperature of the laser pumping beam combiner is effectively reduced. However, due to the high cost and energy waste, only a small part of enterprises pursuing higher quality adopt the scheme.

For a pulse amplification light path, the pulse amplification light path is generally designed into a multi-chip pump source, and the multi-chip pump source has the advantages of high output energy, high brightness, high coupling efficiency with a laser beam combiner, foldback coupling design, less light return, large shell space, good heat dissipation and low chip failure rate, but has larger energy surplus and waste during use.

How to ensure the laser pumping source of the pulse generation light path has high supply energy, high brightness, low chip failure rate and low processing cost, and is a difficult point to be solved by the current optical fiber pulse laser.

Disclosure of Invention

The utility model aims to solve the defects in the prior art, and provides a multi-tail fiber output laser pumping source module which replaces a laser pumping source of a pulse generation light path and a pulse amplification light path, reduces the pumping source cost of an optical fiber laser, ensures enough energy supply, avoids energy waste, improves the output light brightness, reduces the temperature of a laser pumping beam combiner, reduces the chip failure rate, and ensures the use duration and marking strength of the laser. And an indication light input function is added, so that the number of the red light coupling light paths additionally added by the fiber laser can be reduced.

In order to achieve the above purpose, the present utility model provides the following technical solutions:

the laser pumping source comprises a plurality of light source modules, first collimating lenses, second collimating lenses, first reflecting mirrors, lens components (optical filters, first focusing lenses, energy beam splitters), first transmission optical fibers and second transmission optical fibers, wherein the number of the first collimating lenses, the number of the second collimating lenses, the number of the first reflecting mirrors, the number of the lens components (optical filters, the number of the first focusing lenses, the number of the energy beam splitters) are the same as that of the light source modules;

through the technical scheme, the light source modules are distributed in an array, the light source modules in each row are staggered from high to low in sequence, and each light source module is correspondingly provided with a first collimating lens, a second collimating lens and a first reflecting mirror;

further, the pump source is provided with stepped heat sinks, each stepped heat sink comprises a first heat sink and a second heat sink which are long-shaped and are arranged side by side, the light source modules and the first collimating lenses are arranged on the first heat sink to form array distribution, and the second collimating lenses and the first reflecting mirrors are correspondingly arranged on the second heat sink; 1 focusing lens assembly is arranged on the pump light refraction optical path;

through the technical scheme, the first collimating lens is placed at a position close to the light source module, the second collimating lens is placed at a position far from the light source module, and the optical axis centers of the two collimating lenses are respectively overlapped with the light beam centers of the noon and sagittal planes of photons emitted by the light source. The first reflecting plate forms an included angle of 45 degrees with the emergent optical axis.

Further, the lens assembly further comprises an optical filter, a focusing lens and an energy beam splitting sheet, wherein the optical filter and the energy beam splitting sheet are sequentially arranged according to the emergent light direction, and the optical filter and the energy beam splitting sheet are arranged at a certain included angle with the optical axis according to the design. The center of the optical axis of the focusing lens coincides with the center of the light beam;

through the above technical scheme, the first focusing lens can be a spherical or aspheric lens, and can simultaneously realize focusing of a fast axis and a slow axis for the pump light reflected by the first reflecting sheet, or can be a separated lens group which is sequentially arranged and respectively performs focusing of the fast axis and the slow axis.

Further, a first transmission optical fiber is arranged at the rear of the lens assembly, a second transmission optical fiber is arranged at the side of the lens assembly, and a high-transmission film layer is plated on the end face of the optical fiber.

Through the technical scheme, the transmission optical fiber can also be in the form of an optical fiber fused quartz rod, the end face of the fused quartz rod can be a plane or can be processed into a curved surface, and the transmission optical fiber is required to be plated with a high-transmission film layer.

The utility model has the following beneficial effects:

in the utility model, an energy beam splitter is arranged in a laser pumping source, and after passing through the same first focusing lens, a master pump Pu Guangshu can split into 2 light beams at the energy beam splitter and respectively enter a first transmission optical fiber and a second transmission optical fiber. The first and second transmission fibers supply energy to 2 optical paths (pulse generation optical path and pulse amplification optical path) of the fiber laser, respectively.

Compared with the first traditional independent supply mode (a single-chip pump source supply pulse generation optical path and a multi-chip pump source supply pulse amplification optical path), the uniformity of chip working current is guaranteed, when high-frequency working is no longer generated, the single-chip pump source current is high, and the multi-chip pump source has a large surplus, so that the asymmetric condition is achieved. The utility model adopts the space design of refraction and reflection coupling, the space is not compact, less return light exists, the volume of heat dissipation metal is large, thereby greatly reducing the failure rate, the output brightness is high, the temperature of the laser pump beam combiner is low, and the coupling efficiency between the pump source and the beam combiner is improved.

Compared with the second traditional supply mode (a dual-chip pump source supply pulse generation optical path and a multi-chip pump source supply pulse amplification optical path), the laser device has the advantages that a uniform focusing optical path is used, the number of laser chips can be reduced, energy waste is avoided, and production cost is reduced.

Drawings

FIG. 1 is a schematic front projection of a first surface of a first embodiment of the present patent;

fig. 2 is a schematic front projection view of the first surface of the second embodiment of the present patent.

Legend description:

1. a base; 100. a light source module; 101. a heat sink region; 102. a coupling region; 10. a mounting groove; 2. a mounting hole; 3. a mounting hole; 5. a conductive rail; 6. a conductive rail; 7. pin 200, first collimating lens; 300. a second collimating lens; 400. a first reflection sheet; 8. a first heat sink; 9. a second heat sink; 500. a light filter; 600. a first focusing lens; 700. an energy beam splitter; 800. a first transmission fiber; 900. a second transmission fiber; 1000. an indication light module; 1001. an indication light source; 1002. a second focusing lens; 1003. an optical filter.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Embodiment one;

the patent provides a laser pumping source, as shown in the figure, base 1 is flat cuboid shape, and base 1 is equipped with whole sunken mounting groove 10, and this mounting groove 10 is equipped with heat sink region 101 and coupling area 102, and coupling area 102 is located one side of 101. The heat sink area 101 is encapsulated with a plurality of light source modules 100 for emitting pump light, the plurality of light source modules 100 are staggered, so that the light source modules 100 do not interfere with each other, light emitted by the light source modules 100 is prevented from being blocked by other light source modules 100 or interfering with each other, and the heat sink area 101 is further provided with optical lenses, wherein the optical lenses comprise first collimating lenses 200, second collimating lenses 300 and first reflecting sheets 400, the quantity of which is the same as that of the light source modules 100, and the first collimating lenses 200, the second collimating lenses 300 and the first reflecting sheets 400 are sequentially arranged along the light emitting direction of each light source module 100.

In this patent, the light source module 100 may be a single laser chip or a laser diode, or may be a bar (bar or diode bar) formed by integrating a plurality of laser chips or laser diodes on a substrate to form a package. Compared with a single laser chip or laser diode, the single bar has higher output power, which is beneficial to improving the integration level of the pump source and improving the output power of the pump source.

Specifically, as shown in fig. 1, the heat sink area 101 is provided with at least one stepped heat sink, each stepped heat sink includes a first heat sink 8 having a long strip shape and second heat sinks 9 having the same number as the first heat sink 8 and a long strip shape, and the first heat sink 8 and the second heat sink 9 are arranged side by side. The plurality of light source modules 100 and the first collimating lenses 200 are arranged on the first heat sink 8 at intervals, and similarly, the optical lens units formed by the second collimating lenses 300 and the first reflecting plates 400 corresponding to the first light source modules 100 are arranged on the second heat sink 9 at intervals. Therefore, more light source modules 100 are packaged in the base of the pumping source with smaller volume in a concentrated mode, and the integration level of the light source modules in the pumping source is improved. The high integration level of the pump source structure and the high power output of the pump source power are realized.

The heat sink area 101 is provided with a plurality of ladder heat sinks, each ladder heat sink is provided with a first heat sink 8 and a second heat sink 9, so that the light source module 100 is distributed on the ladder heat sinks in an array manner, and a plurality of first heat sink units are distributed in a ladder manner from the outer end of the first heat sink 8 to the inner end of the first heat sink 8 from high to low. The plurality of second heat sink units are distributed in a step shape from the outer end of the second heat sink 9 to the inner end of the second heat sink 9 from high to low

Wherein, each first heat sink unit is provided with a packaging plane, the light source module 100 is correspondingly fixed on the packaging plane, the first collimating lens 200 is fixed near the light source module, each second heat sink unit is provided with an optical lens positioning device, and the second collimating lens 300 and the first reflecting sheet 400 are positioned on the second heat sink unit through the optical lens positioning device and are bonded and fixed with the second heat sink unit through heat conduction glue.

Each stepped heat sink is provided with a first heat sink 8 and a second heat sink 9, and the first heat sink unit and the second heat sink unit which are corresponding in position are arranged on the same step. Each first heat sink unit is correspondingly provided with a light source module 100 and a first collimating lens 200, and each second heat sink unit is correspondingly provided with a second collimating lens 300 and a first reflecting sheet 400.

Because the first heat sink units and the second heat sink units are arranged in a step shape from high to low, the reflection centers of the first reflecting sheets 400 on two adjacent second heat sink units positioned on the same second heat sink 9 can not overlap with each other, and the reflection center of the first reflecting sheet 400 arranged on the high step surface is higher than the top of the first reflecting sheet 400 arranged on the low step surface, thereby realizing that the reflection light beam of any one first reflecting sheet 400 is not blocked by the rest of the first reflecting sheets 400, and realizing the effective propagation of the light beam.

Correspondingly, in the heat sink area 101, different numbers of light source modules can be arranged on each first heat sink 8 according to the power requirement, for example, 7 light source modules are placed, the power of a single laser chip can reach 10-40W, 7 first collimating lenses 200 are placed close to the light source modules, 7 second collimating lenses 300 and first reflecting plates 400 are arranged on each second heat sink 9, so that the total output power of a single pump source can reach 70-280W through superposition of a plurality of light source modules 100, or higher power can be set, pump light integrated by the laser chip has the characteristics of high brightness, high power density and the like, pump light output by using small-core transmission fibers can be realized, for example, pump light output by using 135-micrometer transmission fibers can be realized, and high-power and high-brightness laser output can be realized.

The pump light emitted from the light source module 100 is compressed and collimated in the fast/slow axis through the first collimating lens 200 and the second collimating lens 300, and is reflected to the coupling region 102 through the first reflecting sheet 400, and the pump light is split in the coupling region.

The coupling area 102 is provided with a lens assembly with filtering, focusing and beam splitting functions, specifically, the coupling area 102 is provided with at least one optical filter 500 for blocking destructive pulse return laser, and the optical filter 500 is arranged in the light emitting direction of the light source module and is placed at a certain included angle on the light emitting optical axis. The pump light may be transmitted through. An integrated first focusing lens 600 is disposed behind the filter 500 to simultaneously focus the emitted pump light in the fast/slow directions, and preferably, the first focusing lens 600 may also include separate designs such as a fast focusing lens and a slow focusing lens. An energy beam splitter 700 is disposed behind the first focusing lens 600, and forms an angle of 45 degrees with the light-emitting optical axis, so as to split the focused light beam passing through the first focusing lens 600 into 2 light beams, wherein the energy ratio between the 2 light beams can be achieved by adjusting the transmission and reflection coating values of the energy beam splitter 700, the 2 light beams form 90 degrees, the transmitted light beam is the first light beam, and the reflected light beam is the second light beam.

The base 1 is provided with two optical fiber mounting holes in the side wall direction, a first transmission optical fiber 800 is arranged at the mounting hole 2, and a second transmission optical fiber 900 is arranged at the mounting hole 3. The two transmission optical fibers are kept coincident with the transmission optical axes of the first light beam and the second light beam by the positioning device. After passing through the coupling assembly, the pump light is split into 2 beams with a certain energy ratio, and enters the first transmission optical fiber 800 and the second transmission optical fiber 900 according to a set optical path. Finally, the pump light is output from the transmission fibers 800 and 900 and can be used as a pump light source of the fiber laser.

In addition, an installation hole 4 may be further formed on the side wall of the base 2, and an indication light module 1000 is disposed on the installation groove, where the indication light module 1000 includes an indication light source 1001 and a collimating lens (not labeled). The second focusing lens 1002 and the filter 1003 are disposed in the light emitting direction of the indication light source module. The indication light emitted by the indication light module 1000 is red light, the band of the red light is 620-760nm, and in other embodiments, the indication light module 1000 may be an indication light module with other colors.

The indication light source 1001 emits indication light, after being collimated by the collimating lens, focused by the second focusing lens 1002, and then transmitted back through the optical filter 1003, and after being split into the energy sheet 700, the energy sheet enters the second transmission optical fiber 900. Finally, the indication light and the pump light can be output from the transmission optical fiber, and the indication light can be used as an indication light source of the optical fiber laser.

In some embodiments, a conductive rail 5, a conductive rail 6, which may be a conductive copper sheet or a conductive aluminum sheet, is disposed near the first heat sink 8, and a pin 7 for connecting a power supply terminal is connected to one end of the stepped heat sink near the side wall of the base 1, so that the stepped heat sink, the conductive rail, and the two electrical pins 7 form a serial loop with the power supply terminal, and the power supply terminal supplies power to the light source 100 on the stepped heat sink.

Embodiment two;

instead of the energy splitting sheet, a half-wave plate and a polarization splitting prism may be used, as shown in fig. 2: the light splitting surface of the polarization splitting prism 700 forms 45 degrees with the light path, and the polarization splitting prism 700 can transmit P polarized light and reflect S polarized light. The laser chip outputs P polarized light. The half-wave plate can design the angle of the optical axis, so that linearly polarized light incident to the half-wave plate rotates by different angles. For example, in this embodiment, the P polarized light output by the light source modules 100 distributed in the array is shaped into rectangular parallel light by the first collimating lens 200 and the second collimating lens 300, and then reflected to the filter 500 by the first reflecting sheet 400, and the light beam passing through the first focusing lens 600 enters a half glass slide, optionally rotated by 15 degrees, and enters the light splitting surface of the polarization splitting prism 700, and the total energy is 25.8% of S polarized light reflected and 74.2% of P polarized light transmitted by the light beam distributed in the sine. Wherein the P-polarized light is coupled into the first transmission fiber and the S-polarized light is coupled into the second transmission fiber.

Working principle: the pump light emitted from the light source module 100 is compressed and collimated by the first collimating lens 200 and the second collimating lens 300 along the fast/slow axis, and is reflected to the coupling region 102 by the first reflecting sheet 400, the pump light is split in the coupling region, the coupling region 102 is provided with a lens assembly having filtering, focusing and splitting functions, specifically, the coupling region 102 is provided with at least one optical filter 500 for blocking destructive pulse return laser, and the optical filter 500 is arranged in the light emitting direction of the light source module and is placed at a certain included angle on the light emitting optical axis. The pump light may be transmitted through. An integrated first focusing lens 600 is disposed behind the filter 500 to simultaneously focus the emitted pump light in the fast/slow directions, and preferably, the first focusing lens 600 may also include separate designs such as a fast focusing lens and a slow focusing lens. An energy beam splitter 700 is disposed at the rear of the first focusing lens 600 and forms an angle of 45 degrees with the light-emitting optical axis, and is used for splitting the focused light beam passing through the first focusing lens 600 into 2 light beams, the energy ratio between the 2 light beams can be achieved by adjusting the transmission and reflection coating values of the energy beam splitter 700, the 2 light beams form 90 degrees, the transmitted light beam is the first light beam, the reflected light beam is the second light beam, two optical fiber mounting holes are arranged in the side wall direction of the base 1, the first transmission optical fiber 800 is arranged at the mounting hole 2, and the second transmission optical fiber 900 is arranged at the mounting hole 3. The two transmission optical fibers are kept coincident with the transmission optical axes of the first light beam and the second light beam by the positioning device. After passing through the coupling assembly, the pump light is split into 2 beams with a certain energy ratio, and enters the first transmission optical fiber 800 and the second transmission optical fiber 900 according to a set optical path. Finally, the pump light is output from the transmission fibers 800 and 900 and can be used as a pump light source of the fiber laser.

Finally, it should be noted that: the foregoing description is only illustrative of the preferred embodiments of the present utility model, and although the present utility model has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described, or equivalents may be substituted for elements thereof, and any modifications, equivalents, improvements or changes may be made without departing from the spirit and principles of the present utility model.

Claims (4)

1. The utility model provides a many pigtails output laser pumping source, includes a plurality of light source modules (100), its characterized in that: the number of the first collimating lenses (200), the second collimating lenses (300), the first reflecting mirrors (400) which are the same as the number of the light source modules, the lens assembly comprising an optical filter (500), a first focusing lens (600), an energy splitting sheet (700)), a first transmission optical fiber (800), and a second transmission optical fiber (900).

2. The multi-pigtail output laser pumping source of claim 1, wherein: the pump source is provided with stepped heat sinks, each stepped heat sink comprises a first heat sink (8) and a second heat sink (9) which are long-shaped and are arranged side by side, the light source module (100) and the first collimating lens (200) are arranged on the first heat sink (8) to form array distribution, and the second collimating lens (300) and the first reflecting mirror (400) are correspondingly arranged on the second heat sink (9); 1 focusing lens (1002) assembly is arranged on the pump light refraction optical path.

3. The multi-pigtail output laser pumping source of claim 1, wherein: the lens assembly further comprises an optical filter (500), a first focusing lens (600) and an energy beam splitting sheet (700), wherein the optical filter (500) and the energy beam splitting sheet (700) are sequentially arranged according to the emergent light direction, the optical filter and the energy beam splitting sheet (700) are arranged at a certain included angle with the optical axis according to the design, and the optical axis center of the focusing lens coincides with the optical beam center.

4. The multi-pigtail output laser pumping source of claim 1, wherein: the rear of the lens assembly is provided with a first transmission optical fiber (800), the side of the lens assembly is provided with a second transmission optical fiber (900), and the end face of the optical fiber is plated with a high-transmission film layer.