CN219041029U - Optical fiber integrated device for pulse optical fiber laser and pulse optical fiber laser - Google Patents

Abstract

The utility model provides an optical fiber integrated device for a pulse optical fiber laser, comprising: the device comprises a shell, a passive optical fiber arranged on one side of the shell, a high-reflection element, an acousto-optic crystal, a first reflecting mirror, a coupling lens, an acousto-optic transducer, a plurality of pumping laser chips, a plurality of shaping lens groups and a plurality of second reflecting mirrors, wherein the high-reflection element, the acousto-optic crystal, the first reflecting mirror, the coupling lens, the acousto-optic transducer, the plurality of pumping laser chips, the plurality of shaping lens groups and the plurality of second reflecting mirrors are packaged in the shell; the pump light emitted by the pump laser chip sequentially passes through the shaping lens group, the second reflecting mirror plate and the first reflecting mirror plate, and is reflected by the first reflecting mirror plate to be emitted into the coupling lens, and then is coupled and injected into the passive optical fiber. The utility model integrates the functions of Q-switching, beam combination and pump light emission, thus obtaining a multifunctional and miniature integrated optical fiber integrated device, further improving the miniaturization of the pulse optical fiber laser, the utilization rate of the pump light and ensuring the beam quality of the signal laser.

Description

Optical fiber integrated device for pulse optical fiber laser and pulse optical fiber laser

Technical Field

The utility model relates to the technical field of laser, and particularly provides an integrated device for a pulse fiber laser and the pulse fiber laser.

Background

The pulse fiber laser is widely applied to the processing fields of marking, welding, cutting and the like. The acousto-optic Q-switched pulse fiber laser has the advantages of high frequency, high peak power and the like, and is one of the hot spots focused on the precision machining fields such as laser cleaning, laser texturing, laser fine drilling, laser cutting and the like. With the increasing demands of laser technology and processing systems in these fields for miniaturization and integration of lasers, highly integrated and economical acousto-optic Q-switched pulse lasers will become a mainstream trend of future markets. The Q-switched pulse laser utilizes a Q switch to periodically adjust the cavity loss of the laser, so that the reverse particle number is continuously accumulated when the cavity is high in loss, and the reverse particle number is in a high-gain and high-density state when the cavity is low in loss. When the energy in the cavity exceeds the laser oscillation threshold, an energy difference is formed, and the energy difference is released in a short time, so that a laser pulse with a narrow pulse (ns magnitude) and a high peak value (KW magnitude) can be obtained.

Based on the theory, the optical path of the conventional pulse fiber laser system is shown in fig. 1, and the pump source and the acousto-optic modulator can be considered to be combined into a resonant cavity system. Under the power-on state, the acousto-optic crystal in the Q switch is influenced by the acousto-optic effect and the pump source light amplified by the active optical fiber to generate Bragg diffraction, so that the Q value of the resonant cavity is reduced, the energy accumulated by the device under the power-off state is released in a short time, and the requirement of outputting high-peak pulse light by the laser is met.

The use of these separate fiber devices can meet the functional requirements of a pulsed fiber laser system, but at the same time has some drawbacks: 1. the pump light emitted by the chip enters the optical fiber through space coupling, then enters the Q switch through fusion connection of the optical fiber and the optical fiber, and then is output through fusion connection of the optical fiber. Loss exists in the optical fiber coupling and welding process, and the efficiency of pump light is reduced; 2. the use of Q-switches increases the cost of the pulsed laser system; 3. the manufacturing process of the Q switch is limited, and the Q switch can consume a part of pumping laser, so that the brightness of the pumping laser entering a main light path is reduced; 4. the fusion drawing structure of the Q switch and the outside of the fusion points among the optical fibers can additionally influence the beam quality of the signal laser; 5. too many independent optical devices and optical fibers occupy a large space, which is disadvantageous for the integration of the fiber laser system.

Disclosure of Invention

Based on the above, the utility model provides an optical fiber integrated device for a pulse optical fiber laser and the pulse optical fiber laser, so as to realize the functional integration of Q-switching, beam combination and pump light emission, obtain a multifunctional and miniature integrated optical device, improve the miniaturization of the pulse optical fiber laser, the utilization rate of pump laser and ensure the beam quality of signal laser.

The utility model provides an optical fiber integrated device for a pulse optical fiber laser, which comprises: the device comprises a shell, a passive optical fiber arranged on one side of the shell, a high-reflection element, an acousto-optic crystal, a first reflecting mirror, a coupling lens, an acousto-optic transducer, a plurality of pumping laser chips, a plurality of shaping lens groups and a plurality of second reflecting mirrors, wherein the high-reflection element, the acousto-optic crystal, the first reflecting mirror, the coupling lens, the acousto-optic transducer, the plurality of pumping laser chips, the plurality of shaping lens groups and the plurality of second reflecting mirrors are packaged in the shell; the high-reflection element, the acousto-optic crystal, the first reflecting lens, the coupling lens and the passive optical fiber are sequentially arranged on the same optical path, the high-reflection element is plated with a high-transmission film layer of signal laser, the first reflecting lens is plated with a high-transmission film layer of signal laser and a high-reflection film layer of pumping light, and the coupling lens is plated with a high-transmission film layer of signal laser and pumping light; the acousto-optic transducer is arranged on one side of the acousto-optic crystal and is electrically connected with the acousto-optic crystal; the shaping lens groups and the second reflecting mirror plates are correspondingly arranged along the direction of the pump light emitted by each pump laser chip, the shaping lens groups are plated with pump light high-transmittance film layers, the second reflecting mirror plates are plated with pump light high-reflectance film layers, and the pump light emitted by the pump laser chip sequentially passes through the shaping lens groups, the second reflecting mirror plates and the first reflecting mirror plates, is reflected by the first reflecting mirror plates to be emitted into the coupling lens, and is then coupled and injected into the passive optical fiber; the power pin and the radio frequency connector are both arranged on the shell, the power pin is connected with the pumping laser chip, and the radio frequency connector is connected with the acousto-optic transducer.

Further, the method further comprises the following steps: the mounting seat is fixed on the bottom plate of the shell, is stepped and is far away from the direction of the optical axis of the signal laser, and the steps of the mounting seat are gradually increased;

the pump laser chips are arranged in a height difference mode on the mounting seat, and the pump laser chips, the shaping lens group and the second reflecting lens which are arranged correspondingly to the pump laser chips are arranged on the step with the same height.

Further, the method further comprises the following steps: the third reflection lens is arranged between the first emission lens and the coupling lens, and is arranged on the same optical path with the first emission lens and the coupling lens, the fourth reflection lens is arranged corresponding to the direction of the visible light emitted by the visible light laser chip, and the visible light emitted by the visible light laser chip sequentially passes through the fourth reflection lens and the third reflection lens, is reflected by the third reflection lens, is emitted into the coupling lens, and is then coupled and injected into the passive optical fiber through the coupling lens;

the third reflecting lens is plated with a high-transmission film layer for transmitting signal laser and pump light and a high-reflection film layer for reflecting visible light;

the power supply pin is connected with the visible light laser chip.

Further, the high-reflection element comprises a high-reflection element and a high-reflection film layer which is plated on the high-reflection element and is used for reflecting signal laser; alternatively, the high-reflectivity element comprises a high-reflectivity film layer which is directly plated on the surface of the acousto-optic crystal and is used for reflecting signal laser.

Further, the wavelength of the pump light is 915nm or 976nm, the wavelength of the signal laser light is 1080nm or 1064nm, and the wavelength of the red light is 638nm.

Further, the power pin and the radio frequency connector are arranged on the same side of the shell.

Further, the high-reflection element, the acousto-optic crystal, the first reflecting mirror, the coupling lens, the acousto-optic transducer, the pumping laser chips, the shaping lens groups and the second reflecting mirrors are all detachably arranged on the bottom plate of the shell.

In addition, the utility model also provides a pulse fiber laser, which comprises: the optical fiber integrated device, the gain optical fiber and the low reflection optical fiber grating which are sequentially connected and used for the pulse optical fiber laser, wherein the high reflection element and the low reflection optical fiber grating form a resonant cavity.

Further, the core diameter of the passive optical fiber, the gain optical fiber and the low reflection optical fiber grating is 20-30 mu m, and the cladding diameter is 125-155 mu m.

Further, the passive optical fiber, the gain optical fiber and the low reflection optical fiber grating are one of single-clad optical fiber, double-clad optical fiber, multi-clad optical fiber, polarization maintaining optical fiber or tapered optical fiber.

The utility model has the beneficial effects that:

the utility model provides an optical fiber integrated device for a pulse optical fiber laser, comprising: the device comprises a shell, a passive optical fiber arranged on one side of the shell, a high-reflection element, an acousto-optic crystal, a first reflecting mirror, a coupling lens, an acousto-optic transducer, a plurality of pumping laser chips, a plurality of shaping lens groups and a plurality of second reflecting mirrors, wherein the high-reflection element, the acousto-optic crystal, the first reflecting mirror, the coupling lens, the acousto-optic transducer, the plurality of pumping laser chips, the plurality of shaping lens groups and the plurality of second reflecting mirrors are packaged in the shell; the high-reflection element, the acousto-optic crystal, the first reflecting lens, the coupling lens and the passive optical fiber are sequentially arranged on the same optical path, the high-reflection element is plated with a high-transmission film layer of signal laser, the first reflecting lens is plated with a high-transmission film layer of signal laser and a high-reflection film layer of pumping light, and the coupling lens is plated with a high-transmission film layer of signal laser and pumping light; the acousto-optic transducer is arranged on one side of the acousto-optic crystal and is electrically connected with the acousto-optic crystal; the shaping lens groups and the second reflecting mirror plates are correspondingly arranged along the direction of the pump light emitted by each pump laser chip, the shaping lens groups are plated with pump light high-transmittance film layers, the second reflecting mirror plates are plated with pump light high-reflectance film layers, and the pump light emitted by the pump laser chip sequentially passes through the shaping lens groups, the second reflecting mirror plates and the first reflecting mirror plates, is reflected by the first reflecting mirror plates to be emitted into the coupling lens, and is then coupled and injected into the passive optical fiber; the power pin and the radio frequency connector are both arranged on the shell, the power pin is connected with the pumping laser chip, and the radio frequency connector is connected with the acousto-optic transducer. Compared with the prior art, the utility model integrates the functions of Q-switching, beam combination and pump light emission, and a multifunctional and small integrated optical fiber integrated device is obtained.

In addition, the utility model also provides a pulse fiber laser, which comprises: the optical fiber integrated device, the gain optical fiber and the low reflection optical fiber grating for the pulse optical fiber laser are sequentially connected, wherein the high reflection element and the low reflection optical fiber grating form a resonant cavity. The pulse fiber laser comprises the optical fiber integrated device, so that the miniaturization of the pulse fiber laser, the utilization rate of pump light and the light beam quality of signal laser can be further improved.

Drawings

One or more embodiments are illustrated by way of example and not limitation in the figures of the accompanying drawings, in which like references indicate similar elements, and in which like reference numerals refer to similar elements unless otherwise specified.

FIG. 1 is a schematic diagram of the optical path structure of a pulse laser according to the prior art;

FIG. 2 is a schematic diagram of a fiber integrated device for a pulsed fiber laser according to this embodiment;

FIG. 3 is a schematic perspective view of a fiber optic integrated device for a pulsed fiber laser based on FIG. 2;

FIG. 4 is a schematic diagram of another optical fiber integrated device for a pulsed fiber laser according to this embodiment;

fig. 5 is a schematic diagram of a pulse fiber laser based on fig. 4.

Detailed Description

In order that the utility model may be readily understood, a more particular description thereof will be rendered by reference to specific embodiments that are illustrated in the appended drawings. It will be understood that when an element is referred to as being "disposed on," "secured to," "mounted to" another element, it can be directly on the other element or one or more intervening elements may be present therebetween. The term "and/or" as used in this specification includes any and all combinations of one or more of the associated listed items. In addition, in the present specification, the words "first", "second", "third" and "fourth" do not limit the data and the execution order, but merely distinguish between functions and actions, and do not limit the embodiments of the present utility model.

In the embodiment of the present utility model, as shown in fig. 2, the optical axis along the signal laser L1 is the main optical path.

In order to illustrate the technical scheme of the utility model, the following description is made by specific examples.

In the prior art, as shown in the schematic optical path structure of the pulse fiber laser shown in fig. 1, the pump output end of the pump source 1 'is connected with the pump input end of the beam combiner 2', the output end of the beam combiner 2 'is connected with the high reflection fiber grating 3', the output end of the high reflection fiber grating 3 'is connected with the input end of the gain fiber 4', the gain fiber 4 'is connected with the input end of the Q-switch 5', the output end of the Q-switch 5 'is connected with the low reflection fiber grating 6', the high reflection fiber grating and the low reflection fiber grating form a resonant cavity, the pump light emitted by the pump source 1 'is coupled and injected into the resonant cavity through the beam combiner 2', the gain fiber absorbs the excitation radiation signal laser, the loss in the resonant cavity is periodically regulated by the Q-switch, and finally the signal laser is output from the output end of the low reflection fiber grating. In the prior art, if the number of pump sources is increased to increase the output power of the fiber laser, or the pump sources with larger pump light power are used to increase the output power of the fiber laser, the pump sources occupy a large volume. For more convenient understanding of the pump source, reference may be made to chinese patent, for example, an optical fiber semiconductor laser (CN 202022199473.2) outputting laser light with multiple wavelengths, which discloses a housing provided with a placement plate, wherein a surface of the placement plate is uniformly provided with a plurality of placement grooves in a stepped manner, a chip set is fixed in each placement groove, and each chip set is correspondingly provided with a collimation transparent set (or a shaping lens set), a reflecting mirror set, a focusing mirror set and an optical fiber, and each chip set is connected with a conductive pin. In addition, the pump source 1' is separately connected with other independent optical devices, such as the beam combiner 2' and the Q-switch 5', through optical fibers, redundant fusion points are generated, and the pump light and the signal laser are lost due to the existence of the fusion points, and besides, the pump source and other discrete devices are separated, so that the heat dissipation of the pulse optical fiber laser is not facilitated.

In addition, in the prior art, the acousto-optic modulator (or Q-switch) is a single device, which generally includes a housing, and an acousto-optic crystal, a piezoelectric transducer and a driving power supply which are encapsulated in the housing, and for convenience of use, an input end and an output end of the acousto-optic modulator are both welded with transmission fibers through fusion drawing. If the optical fiber is applied to an optical path system of a fiber laser, the transmission fibers at two ends of the acousto-optic modulator are only connected with other devices such as a beam combiner through the transmission fibers, so that redundant fusion points are generated, and pump light and signal laser are lost due to the existence of the fusion points. In addition, the single acousto-optic modulator not only needs fusion drawing, but also has larger volume, and is not beneficial to heat dissipation when being independently applied to an optical path system.

Based on this, a first embodiment provides an optical fiber integrated device for a pulse optical fiber laser, as shown in fig. 2, including: a housing 1, a passive optical fiber 6 arranged at one side of the housing, a high-reflection element 2, an acousto-optic crystal 3, a first reflecting mirror 4, a coupling lens 5, an acousto-optic transducer 7, a plurality of pumping laser chips 8, a plurality of shaping lens groups 9 and a plurality of second reflecting mirrors 10 which are encapsulated in the housing; the high-reflection element 2, the acousto-optic crystal 3, the first reflection lens 4, the coupling lens 5 and the passive optical fiber 6 are sequentially arranged on the same optical path, the high-reflection element 2 is plated with a high-transmission film layer of signal laser, the first reflection lens 4 is plated with a high-transmission film layer of signal laser and a high-reflection film layer of pump light, and the coupling lens 5 is plated with a high-transmission film layer of signal laser and pump light; an acousto-optic transducer 7 encapsulated in the housing 1, which is disposed at one side of the acousto-optic crystal 3 and electrically connected with the acousto-optic crystal 3; the pump laser device comprises a plurality of pump laser chips 8, a plurality of shaping lens groups 9 and a plurality of second reflecting lenses 10 which are packaged in a shell 1, wherein the shaping lens groups 9 and the second reflecting lenses 10 are correspondingly arranged along the direction of emitting pump light L2 of each pump laser chip 8, the shaping lens groups 9 are plated with pump light high-reflectivity film layers, the second reflecting lenses 10 are plated with pump light high-reflectivity film layers, and the pump light L2 emitted by the pump laser chips 8 sequentially passes through the shaping lens groups 9, the second reflecting lenses 10 and the first reflecting lenses 4, is reflected by the first reflecting lenses 4 and is injected into the coupling lenses 5, and is then coupled and injected into the passive optical fibers 6; the power pin 11 and the radio frequency connector 12 are both arranged on the shell 1, the power pin 11 is connected with the pump laser chip 8 to supply power for the pump laser chip 8, and the radio frequency connector 12 is connected with the acousto-optic transducer 7 to supply power for the acousto-optic transducer 7.

Compared with the prior art, the optical fiber integrated device of the embodiment realizes the multifunctional integration of the Q-switch, the beam combiner and the pump light so as to obtain the multifunctional and miniaturized integrated optical fiber integrated device, and simultaneously reduces the loss of the pump light.

In addition, in this embodiment, the high-reflectivity element 2, the acousto-optic crystal 3, the first reflecting mirror 4, the coupling lens 5, the acousto-optic transducer 7, the plurality of pump laser chips 8, the plurality of shaping lens groups 9 and the plurality of second reflecting mirrors 10 are detachably mounted on the bottom plate of the housing 1. Thus, when the related devices in the optical fiber integrated device are damaged, simple replacement can be performed. Compared with the prior art, if the pump source and the Q-switch are damaged, the independent optical device in the fiber laser is directly replaced, so that the technology is complex, the maintenance cost is high, and the waste of the optical device can be caused.

In some embodiments, when the optical fiber integrated device is applied to the optical fiber laser, it is preferable that the power pin 11 and the rf connector 12 are disposed on the same side of the housing 1 for convenience of installation and space occupation reduction.

The high-reflection element 2 includes a high-reflection element 2 and a high-reflection film layer plated on the high-reflection element for reflecting the signal laser; alternatively, the highly reflective element 2 includes a highly reflective film layer directly plated on the surface of the acousto-optic crystal for reflecting the signal laser light. The high-permeability film layer in this embodiment refers to a film layer with a transmittance of 99% or more, and the high-reflectivity film layer refers to a film layer with a reflectance of 99% or more.

Further, as shown in fig. 3, the optical fiber integrated device further includes: the mounting seat 16 is mounted on the bottom plate of the housing 1, the mounting seat 16 is in a step shape, and is far away from the optical axis direction of the signal laser L1, and the step of the mounting seat 16 is gradually increased. The pump laser chips 8 are arranged in a height difference on the mounting base 16, so as to prevent the pump light emitted by the pump laser chips 8 from interfering with each other. In addition, the pump laser chip 8 and the shaping lens group 9 and the second reflecting mirror 10 which are correspondingly arranged are arranged on the steps with the same height.

In some embodiments, as shown in fig. 4, the integrated device further comprises: the third reflecting mirror 15 is arranged between the first reflecting mirror 4 and the coupling lens 5, and is arranged on the same optical path with the first reflecting mirror 4 and the coupling lens 5, the fourth reflecting mirror 15 is arranged corresponding to the direction of the visible light L3 emitted by the visible light laser chip 13, the visible light L3 emitted by the visible light laser chip 13 sequentially passes through the fourth reflecting mirror 14 and the third reflecting mirror 15, and is reflected into the coupling lens 5 through the reflection of the third reflecting mirror 15, and then is coupled and injected into the passive optical fiber 6 through the coupling lens 5; the third reflecting mirror 15 is coated with a high-transmittance film layer for transmitting the signal laser and the pumping light and a high-reflectance film layer for reflecting the visible light; the power pin 11 is connected with the visible light laser chip 13.

The visible light emitted by the visible light laser chip 13 is one of red light, green light, blue light or purple light, and currently, in the fiber laser, the visible light for indicating is generally red light, so the corresponding visible light laser chip is a red light laser chip.

In this embodiment, the wavelength of the pump light is 915nm, and the wavelength of the signal laser light is 1064nm. The shaping lens group 9 is a fast axis collimating lens 91 and a slow axis collimating lens 92 which are sequentially arranged along the emission direction of the pump light. The shell 1 is made of a metal material with good heat conductivity, such as aluminum alloy, silver-plated alloy, red copper and the like. The shell comprises a bottom plate (not shown), a cover plate (not shown) and side plates (not shown) surrounding the bottom plate (not shown) and the cover plate (not shown). The mounting base 16 is made of a heat sink material, and in this embodiment, the pump laser chip 8 may be welded on the mounting base 16 or fixed on the mounting base 16 by glue. Compared with the prior art, if the independent optical device is adopted, the fiber laser needs to be designed into a heat dissipation system according to the position setting of the independent device, so that the assembly of the fiber laser becomes more complicated and the heat dissipation effect is difficult to control.

In some embodiments, a tube 17 is mounted on one side of the housing 1, and one end of the tube 17 is connected to the passive optical fiber 6, so as to prevent the passive optical fiber 6 from being damaged. Specifically, the passive optical fiber 6 is connected with one end of the tube body 17 in a pluggable manner; and the passive optical fiber 6 may be sinuously coiled to improve the beam quality of the signal laser in order to filter out the higher-order mode laser light. The coupling lens 5 is provided at the opposite end of the tube 17.

In addition, this embodiment also provides a pulse fiber laser, as shown in fig. 5, including: the optical fiber integrated device, the gain optical fiber 18 and the low reflection optical fiber grating 19 for the pulse optical fiber laser are sequentially connected, wherein the high reflection element 2 and the low reflection optical fiber grating 19 form a resonant cavity. In the fiber laser, the resonant cavity is optically coupled with the pump light through space, so that the loss of the pump light is reduced, and meanwhile, the integration and miniaturization of the pulse fiber laser are realized, and the beam quality of the signal laser is ensured. The pump light L2 emitted by the pump laser chip 8 is injected into the gain fiber 18, so as to realize population inversion in the resonant cavity formed by the high-reflection element 2 and the low-reflection fiber grating 19, and when the Q-switch 3 is turned on, the pulse laser (i.e., the signal laser L1 in fig. 5) obtains positive feedback from the resonant cavity, and finally is output from the output end of the low-reflection fiber grating 19.

Compared with the prior art, the high reflection element 2 is adopted to replace the traditional high reflection fiber grating, so that the welding points are reduced, meanwhile, the high reflection element 2 and the low reflection fiber grating 19 are adopted to form a resonant cavity, and in the process of modulating the resonant cavity, the resonant cavity can be simply modulated by moving the position of the high reflection element 2, so that the high reflection element 2 and the low reflection fiber grating 19 are calibrated. In addition, the embodiment adopts the intracavity modulated pulse signal laser, and can also effectively improve the efficiency of converting the pump light into the signal laser.

In this embodiment, the gain fiber 18, the passive fiber 6, and the low reflection fiber grating 19 are one of single-clad fiber, double-clad fiber, multi-clad fiber, polarization maintaining fiber, and tapered fiber, and in order to improve the utilization of the pump light, the passive fiber 6, the gain fiber 18, and the low reflection fiber grating 19 are preferably double-clad fibers.

According to different laser processing requirements, a fiber laser is required to output higher power to meet the laser processing requirements. Therefore, the optical fiber integrated device in this embodiment can output pump light with higher power according to the requirement, but with the increase of the pump light power, in order to fully absorb the pump light, the length of the gain optical fiber is generally selected to be increased, and then nonlinear effects (such as stimulated raman scattering) are easily generated, so that the increase of the output laser power of the fiber laser is limited. Meanwhile, in the prior art, in order to reduce the nonlinear effect, a large-mode-field optical fiber is generally adopted, but when the laser power output by the optical fiber laser reaches a certain threshold value, the mutual interference between a fundamental mode and a high-order mode can cause unstable mode of laser, so that the quality of the beam of the output laser is deteriorated. Based on this, in the present embodiment, the diameter of the cores of the gain fiber 18, the passive fiber 6 and the low reflection fiber grating 19 is preferably 20 to 30 μm, and the diameter of the inner cladding is preferably 125 to 155 μm.

Further, it can be understood that the Q-switched pulse laser of this embodiment does not need to be connected to at least one amplifying stage, and can meet the requirement of high-power pulse laser output only by a single resonant cavity, and the Q-switched pulse laser has the advantages of better beam quality, simple structure, simplified complicated control procedure and improved accuracy of pulse laser output.

In summary, an embodiment of the present utility model provides an optical fiber integrated device for a pulsed fiber laser, including: a housing 1, a passive optical fiber 6 arranged at one side of the housing, a high-reflection element 2, an acousto-optic crystal 3, a first reflecting mirror 4, a coupling lens 5, an acousto-optic transducer 7, a plurality of pumping laser chips 8, a plurality of shaping lens groups 9 and a plurality of second reflecting mirrors 10 which are encapsulated in the housing; the high-reflection element 2, the acousto-optic crystal 3, the first reflection lens 4, the coupling lens 5 and the passive optical fiber 6 are sequentially arranged on the same optical path, the high-reflection element 2 is plated with a high-transmission film layer of signal laser, the first reflection lens 4 is plated with a high-transmission film layer of signal laser and a high-reflection film layer of pump light, and the coupling lens 5 is plated with a high-transmission film layer of signal laser and pump light; the acousto-optic transducer 7 is arranged on one side of the acousto-optic crystal 3 and is electrically connected with the acousto-optic crystal 3; the shaping lens groups 9 and the second reflecting mirror plates 10 are correspondingly arranged along the direction of emitting the pump light L2 of each pump laser chip 8, the shaping lens groups 9 are plated with high-transmittance film layers of the pump light, the second reflecting mirror plates 10 are plated with high-reflectance film layers of the pump light, and the pump light L2 emitted by the pump laser chips 8 sequentially passes through the shaping lens groups 9, the second reflecting mirror plates 10 and the first reflecting mirror plates 4, is reflected by the first reflecting mirror plates 4 and is injected into the coupling lens 5, and is then coupled and injected into the passive optical fiber 6; the power pin 11 and the radio frequency connector 12 are both arranged on the shell 1, the power pin 11 is connected with the pump laser chip 8, and the radio frequency connector 12 is connected with the acousto-optic transducer 7. Compared with the prior art, the utility model integrates the functions of modulating Q, combining beams and emitting pump light together, thereby obtaining a multifunctional and small integrated optical fiber integrated device.

In addition, the utility model also provides a pulse fiber laser, which comprises: the optical fiber integrated device, the gain optical fiber 18 and the low reflection optical fiber grating 19 for the pulse optical fiber laser are sequentially connected, wherein the high reflection element 2 and the low reflection optical fiber grating 19 form a resonant cavity. The pulse fiber laser comprises the optical fiber integrated device, so that the miniaturization of the pulse fiber laser, the utilization rate of pump light and the light beam quality of signal laser can be further improved.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present utility model, and are not limiting; the technical features of the above embodiments or in the different embodiments may also be combined within the idea of the utility model, the steps may be implemented in any order, and there are many other variations of the different aspects of the utility model as described above, which are not provided in detail for the sake of brevity; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the utility model.

Claims (10)

1. A fiber integrated device for a pulsed fiber laser, comprising:

the device comprises a shell, a passive optical fiber arranged on one side of the shell, a high-reflection element, an acousto-optic crystal, a first reflecting mirror, a coupling lens, an acousto-optic transducer, a plurality of pumping laser chips, a plurality of shaping lens groups and a plurality of second reflecting mirrors, wherein the high-reflection element, the acousto-optic crystal, the first reflecting mirror, the coupling lens, the acousto-optic transducer, the plurality of pumping laser chips, the plurality of shaping lens groups and the plurality of second reflecting mirrors are packaged in the shell;

the high-reflection element, the acousto-optic crystal, the first reflecting lens, the coupling lens and the passive optical fiber are sequentially arranged on the same optical path, the high-reflection element is used for reflecting signal laser, the first reflecting lens is plated with a high-transmission film layer of the signal laser and a high-reflection film layer of the pumping light, and the coupling lens is plated with a high-transmission film layer of the signal laser and the pumping light; the acousto-optic transducer is arranged on one side of the acousto-optic crystal and is electrically connected with the acousto-optic crystal;

the shaping lens groups and the second reflecting mirror plates are correspondingly arranged along the direction of the pump light emitted by each pump laser chip, the shaping lens groups are plated with pump light high-transmittance film layers, the second reflecting mirror plates are plated with pump light high-reflectance film layers, and the pump light emitted by the pump laser chip sequentially passes through the shaping lens groups, the second reflecting mirror plates and the first reflecting mirror plates, is reflected by the first reflecting mirror plates to be emitted into the coupling lens, and is then coupled and injected into the passive optical fiber;

the power pin and the radio frequency connector are both arranged on the shell, the power pin is connected with the pumping laser chip, and the radio frequency connector is connected with the acousto-optic transducer.

2. The fiber integrated device for a pulsed fiber laser of claim 1, further comprising:

the mounting seat is fixed on the bottom plate of the shell, is stepped and is far away from the direction of the optical axis of the signal laser, and the steps of the mounting seat are gradually increased;

the pump laser chips are arranged in a height difference mode on the mounting seat, and the pump laser chips, the shaping lens group and the second reflecting lens which are arranged correspondingly to the pump laser chips are arranged on the step with the same height.

3. The fiber integrated device for a pulsed fiber laser of claim 1 or 2, further comprising:

the third reflection lens is arranged between the first reflection lens and the coupling lens, and is arranged on the same optical path with the first reflection lens and the coupling lens, the fourth reflection lens is arranged corresponding to the direction of the visible light emitted by the visible light laser chip, and the visible light emitted by the visible light laser chip sequentially passes through the fourth reflection lens and the third reflection lens, is reflected by the third reflection lens to be emitted into the coupling lens, and is then coupled by the coupling lens to be injected into the passive optical fiber;

the third reflecting lens is plated with a high-transmission film layer for transmitting signal laser and pump light and a high-reflection film layer for reflecting visible light;

the power supply pin is connected with the visible light laser chip.

4. The optical fiber integrated device for a pulsed optical fiber laser of claim 3, wherein the high-reflectivity element comprises a high-reflectivity element and a high-reflectivity film layer plated on the high-reflectivity element for reflecting signal laser light; alternatively, the high-reflectivity element comprises a high-reflectivity film layer which is directly plated on the surface of the acousto-optic crystal and is used for reflecting signal laser.

5. The optical fiber integrated device for a pulsed optical fiber laser of claim 3, wherein the pump light has a wavelength of 915nm or 976nm and the signal laser light has a wavelength of 1080nm or 1064nm.

6. The fiber optic integrated device for a pulsed fiber laser of claim 1, wherein the power pin and the radio frequency connector are disposed on a same side of the housing.

7. The fiber optic integrated device for a pulsed fiber laser of claim 1, wherein the high reflection element, the acousto-optic crystal, the first mirror, the coupling lens, the acousto-optic transducer, the plurality of pump laser chips, the plurality of shaping lens sets, and the plurality of second mirrors are removably mounted on a base plate of the housing.

8. A pulsed fiber laser comprising: the optical fiber integrated device, the gain optical fiber and the low reflection optical fiber grating for the pulse optical fiber laser according to any one of claims 1 to 7, which are connected in sequence, wherein the high reflection element and the low reflection optical fiber grating form a resonant cavity.

9. The pulsed fiber laser of claim 8 wherein said passive fiber, gain fiber and low reflection fiber grating have a core diameter of 20-30 μm and a cladding diameter of 125-155 μm.

10. The pulsed fiber laser of claim 8 wherein said passive fiber, gain fiber and low reflection fiber grating are one of single clad fiber, double clad fiber, multi-clad fiber, polarization maintaining fiber or tapered fiber.

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