Integrated pumping source and system

Abstract

This invention discloses an integrated pump source and system. The integrated pump source includes: a pump source for generating pump light; multiple collimating lens groups, each corresponding to a light source module, for collimating the pump light emitted by the corresponding light source module; a beam splitter disposed in the output light path of at least one of the collimating lens group, focusing lens, and reflector, for splitting at least one of the output light to form a first-level pump light and a second-level pump light; a reflector disposed in the output light path of the collimating lens group and / or the beam splitter, for deflecting and guiding at least a portion of the output light; a focusing lens disposed in the output light path of the reflector and / or the beam splitter, for focusing the output light; a first output pigtail for receiving the focused first-level pump light and outputting it outward; and a second output pigtail for receiving the focused second-level pump light and outputting it outward.

Description

Technical Field

[0001] This invention belongs to the field of laser technology, and particularly relates to an integrated pump source and system. Background Technology

[0002] With the development of laser technology, laser processing has gradually become more widespread. Fiber lasers have advantages such as high efficiency, compact structure, and portability, and are widely used in industrial fields such as laser marking and laser micromachining.

[0003] Acousto-optic Q-switched pulsed fiber laser consists of several components, typically a laser resonator, a laser amplification stage, and an output module. In a conventional design, the laser resonator includes a high-reflectivity grating, an acousto-optic modulator, a first-stage gain fiber, a first-stage combiner, a low-reflectivity grating, and a first-stage pump source. The laser amplification stage includes a second-stage combiner, a second-stage gain fiber, and a second-stage pump source. The output module is a free-space output isolator. In this conventional design, the first-stage and second-stage pump sources require two separate sets of pump drivers.

[0004] Excessive active and passive components, along with complex circuit systems, result in overly large module boxes for housing these components and wasted energy in the internal optical modules of the pump source, making them unsuitable for increasingly integrated, miniaturized, and low-cost application markets. Summary of the Invention

[0005] In view of this, the present invention provides an integrated pump source and system.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: An integrated pump source includes at least one beam splitter, multiple reflectors, and at least one focusing lens, and further includes: A pump source for generating pump light, the pump source comprising multiple light source modules; Multiple collimating lens groups, each corresponding to a light source module, are used to collimate the pump light emitted by the corresponding light source module. The beam splitter is disposed in the light output path of at least one of the collimating lens group, the focusing lens, and the reflector, and is used to split at least one of the light output from the collimating lens group, the light output from the focusing lens, and the light output from the reflector, and after splitting, form a first-level pump light and a second-level pump light allocated according to a preset ratio. The reflector is disposed in the light output path of the collimating lens group and / or the beam splitter, and is used to deflect and guide at least a portion of the light output from the collimating lens group and / or the beam splitter. The focusing lens is disposed in the light output path of the reflector and / or the beam splitter, and is used to focus the light output from the reflector and / or the beam splitter; The first output pigtail is used to receive the focused first-level pump light and output it outward; the output direction of the focused first-level pump light is towards the first output pigtail. The second output pigtail is used to receive the focused second-level pump light and output it outward, wherein the output direction of the focused second-level pump light is toward the second output pigtail.

[0007] Optionally, the integrated pump source further includes at least one isolation anti-reflector, which is inclined relative to the outgoing optical axis of the pump light and disposed on the incident side of the focusing lens. It is used to transmit the forward-transmitting pump light and deflect and block the reverse-transmitting return laser light.

[0008] Optionally, the integrated pump source further includes a driving circuit, which is electrically connected to the plurality of light source modules and is used to drive the pump source. Under the premise that the total output energy of the integrated pump source is constant, the distribution ratio of the first-level pump light and the second-level pump light to the total energy is adjusted by configuring the transmission and reflection ratio of the beam splitter.

[0009] Optionally, the beam splitter is a beam splitter whose reflectivity and transmittance are controlled by coating; Alternatively, the beam splitter is a beam splitting prism with a half-wave plate, and the energy distribution ratio can be adjusted by adjusting the optical axis angle of the half-wave plate.

[0010] Optionally, the integrated pump source includes: Multiple reflectors are disposed in the light output path of the collimating lens group. The reflectors correspond to the collimating lens group and are used to deflect and guide the corresponding collimated pump light to form deflected light. The propagation direction of the deflected light is perpendicular to the propagation direction of the light output from the collimating lens group. A focusing lens is disposed in the light output path of the reflector to focus the deflected light into a combined beam. A beam splitter is disposed in the light output path of the focusing lens to split the combined light, thereby forming a first-level pump light and a second-level pump light after focusing. Alternatively, the integrated pump source may include: A beam splitter is disposed on the output light path of the collimating lens group away from the first output pigtail side, and is used to split the collimated light of the collimating lens group to form a first-level pump light and a second-level pump light; wherein the collimating lens outputs collimated light. Multiple first reflectors are disposed in the light output path of the remaining collimating lens groups. Each first reflector corresponds to one of the remaining collimating lens groups. The first reflector is used to deflect and guide the collimated light of the corresponding collimating lens group to form first deflected light. The second reflector is disposed in the output light path of the second-level pump light and is used to deflect and guide the second-level pump light to form the second deflected light. A first focusing lens is disposed in the light output path of the first reflector and the beam splitter, and is used to focus the first deflected light and the first level pump light to form the focused first level pump light. The second focusing lens is disposed in the light output path of the second reflector and is used to focus the second deflected light to form the focused second-level pump light; Alternatively, the integrated pump source may include: Multiple beam splitters are disposed in the output light path of the collimating lens group. Each beam splitter corresponds to the collimating lens group and is used to split the collimated light of the corresponding collimating lens group to form a first-level pump light and a second-level pump light. Multiple reflectors, each corresponding to a beam splitter, are disposed on the output light path of the second-level pump light of the corresponding beam splitter. The reflectors are used to deflect and guide the corresponding second-level pump light to form deflected light. A first focusing lens is disposed on the output light path of the beam splitter to focus the first-level pump light to form the focused first-level pump light. The second focusing lens is disposed in the light output path of the reflector to focus the deflected light to form the focused second-level pump light; Alternatively, the integrated pump source may include: Multiple first reflectors are disposed in the light output path of the collimating lens group. The reflectors correspond to the collimating lens group and are used to deflect and guide the collimated light to form first deflected light. The propagation direction of the first deflected light is perpendicular to the propagation direction of the collimated light. A beam splitter is disposed in the light output path of the first reflector to split the first deflected light to form a first-level pump light and a second-level pump light. A first focusing lens is disposed in the light output path of the first-level pump light to focus the first-level pump light to form a focused first-level pump light. The second reflector is disposed in the output light path of the second-level pump light and is used to deflect and guide the second-level pump light to form a focused second-level pump light. The second focusing lens is disposed in the light output path of the second reflector to focus the deflected second-level pump light to form the focused second-level pump light.

[0011] Optionally, the integrated pump source further includes a base, the base having a mounting groove, the mounting groove being divided into a heat sink area and a coupling area; the heat sink area having multiple stepped heat sinks, each of the stepped heat sinks including a first heat sink and a second heat sink arranged side by side; each of the light source modules being respectively fixed on each of the first heat sinks; at least some of the optical components in the reflector, beam splitter, and focusing lens being respectively fixed on each of the second heat sinks.

[0012] An acousto-optic Q-switched pulsed fiber laser system includes: Laser resonant cavity; A laser amplification stage is connected to the optical output terminal of the laser resonant cavity; The output module is connected to the optical path output terminal of the laser amplification stage; and Such as the integrated pump source mentioned above; The first output pigtail of the integrated pump source is optically coupled to the input end of the laser resonant cavity to provide the first-level pump light to the laser resonant cavity; The second output pigtail of the integrated pump source is coupled to the pump light of the side arm of the laser amplification stage, and is used to provide the second-level pump light to the laser amplification stage.

[0013] Optionally, the laser resonant cavity includes a high reflectivity grating, a first-stage gain fiber, an acousto-optic modulator, and a low reflectivity grating connected sequentially along the optical path; The input fiber of the high reflectivity grating is optically coupled to the first output pigtail of the integrated pump source; the output fiber of the low reflectivity grating is optically coupled to the laser amplification stage.

[0014] Optionally, the laser amplification stage includes a beam combiner and a second-stage gain fiber; The side arm pump fiber of the combiner is fused to the second output pigtail of the integrated pump source; The optical fiber at the signal input end of the combiner is also fused to the low-reflectivity grating. The input end of the second-stage gain fiber is fused to the output end of the combiner.

[0015] Optionally, the connection between the first output pigtail and the high reflectivity grating, the connection between the second output pigtail and the pump fiber of the combiner side arm, and the connection between the low reflectivity grating and the input fiber of the second-stage gain fiber are all covered with a low-refractive-index optical adhesive.

[0016] Implementing the embodiments of the present invention will have at least the following beneficial effects: This invention constructs a compact spatial optical collaboration system by integrating a collimating lens group, a reflector, a beam splitter, and a focusing lens. The collimating lens group performs high-precision shaping of the pump light generated by each light source module, and the flexible guidance and convergence of the reflector and focusing lens achieve beam combining and focusing of multiple beams within a very small space. By placing the beam splitter at a specific node in the collimating, reflecting, or focusing optical path, the pump light is physically cut in one step according to a preset ratio, precisely forming two pump light paths: a first-level and a second-level path, both output via independent output pigtails. This eliminates the need for separate power supply from the first-level and second-level pump sources in traditional fiber lasers. The task now only requires a single integrated pump source module and its matching drive circuit to simultaneously meet the differentiated power requirements of the external laser resonator and laser amplification stage. This fundamentally eliminates the need for an additional set of pump source components, independent pump drivers, and complex external beam combiners. This not only significantly reduces the number of redundant active and passive components in the laser system, greatly shrinks the physical size of the entire module, and lowers hardware costs, but also effectively shortens the optical path and avoids energy loss of pump light during multi-stage transmission and distribution, thanks to the seamless connection and compact arrangement of various optical components. This significantly improves the photoelectric conversion efficiency and system integration of the entire system. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the integrated pump source embodiment provided in Embodiment 1 of the present invention; Figure 2 This is a schematic diagram of the integrated pump source embodiment provided in Embodiment 2 of the present invention; Figure 3 This is a schematic diagram of the integrated pump source embodiment provided in Embodiment 3 of the present invention; Figure 4 This is a schematic diagram of the integrated pump source embodiment provided in Embodiment 4 of the present invention; Figure 5 This is a schematic diagram of the acousto-optic Q-switched pulsed fiber laser system provided in Embodiment 5 of the present invention; Wherein, 1-base; 2-second mounting hole; 3-first mounting hole; 4-temperature measuring hole; 5-first conductive rail; 6-second conductive rail; 7-pin; 8-first heat sink; 9-second heat sink; 10-mounting slot; 100-light source module; 101-heat sink area; 102-coupling area; 200-first collimating lens; 300-second collimating lens; 400-reflector; 401-first reflector; 402-second reflector; 500-isolation anti-reflector; 501-first isolation anti-reflector; 502-second isolation anti-reflector; 600-focusing lens; 601-first... 602 - Focusing lens; 700 - Beam splitter; 800 - First output pigtail; 900 - Second output pigtail; 1000 - Integrated pump source; 1001 - First connector; 1002 - Second connector; 1100 - High reflectivity grating; 1200 - First gain fiber; 1300 - Acousto-optic modulator; 1400 - Low reflectivity grating; 1401 - Laser resonant cavity; 1500 - Beam combiner; 1600 - Second-stage gain fiber; 1601 - Laser amplification stage; 1700 - Free-space output isolator; 1701 - Output module. Detailed Implementation

[0019] In the accompanying drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components. In the description of this invention, it should be understood that the terms "upper," "lower," "left," "right," "inner," "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the accompanying drawings are only for illustrative purposes and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0020] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, article, or apparatus that includes that element.

[0021] In one embodiment of an integrated pump source, the integrated pump source 1000 includes at least one beam splitter, multiple reflectors, and at least one focusing lens, and further includes: A pump source for generating pump light, the pump source comprising multiple light source modules 100; Multiple collimating lens groups, each corresponding to the light source module 100, are used to collimate the pump light emitted by the corresponding light source module 100. The beam splitter is disposed in the light output path of at least one of the collimating lens group, the focusing lens, and the reflector, and is used to split at least one of the light output from the collimating lens group, the light output from the focusing lens, and the light output from the reflector, and after splitting, form a first-level pump light and a second-level pump light allocated according to a preset ratio. The reflector is disposed in the light output path of the collimating lens group and / or the beam splitter, and is used to deflect and guide at least a portion of the light output from the collimating lens group and / or the beam splitter. The focusing lens is disposed in the light output path of the reflector and / or the beam splitter, and is used to focus the light output from the reflector and / or the beam splitter; The first output pigtail 800 is used to receive the focused first-level pump light and output it outward; the output direction of the focused first-level pump light is towards the first output pigtail 800. The second output pigtail 900 is used to receive the focused second-level pump light and output it outward, wherein the output direction of the focused second-level pump light is toward the second output pigtail 900.

[0022] Specifically, the pump source, as a basic light-emitting component, is used to generate the pump light required by the system. In practical applications, the pump source typically consists of multiple semiconductor laser diodes (LDs) or light-emitting chip arrays. A collimating lens group is used to receive and collimate the divergent pump light emitted from each of the light source modules 100. Subsequently, the multiple pump lights are spatially converged through spatial guidance and focusing by reflectors and focusing lenses. A beam splitter is used to physically cut the pump light, resulting in a first-level pump light and a second-level pump light distributed according to a preset ratio. A first output pigtail 800 is used to receive the focused first-level pump light and provide it to the external laser resonator 1401; a second output pigtail 900 is used to receive the focused second-level pump light and provide it to the external laser amplification stage 1601.

[0023] For example, the wavelength of the integrated pump source 1000 is generally 915nm or 976nm, the NA is less than 0.19, and a large mode field fiber is used for power transmission. The first output pigtail 800 and the second output pigtail 900 are matched with the laser resonator and the laser amplification stage, respectively, and the total output power can reach the level of hundreds of watts.

[0024] The integrated pump source 1000 is provided with a first mounting hole 3, a second mounting hole 2, and a temperature measuring hole 4 on its side wall. The first output pigtail 800 and the second output pigtail 900 are disposed at the corresponding first mounting hole 3 and second mounting hole 2. The temperature sensing port 4 provides a physical channel for monitoring temperature. When used in conjunction with external temperature sensing elements (such as temperature sensors or thermistors), it is used to monitor the operating temperature inside the integrated pump source 1000 in real time, which helps the entire laser system to perform effective thermal management feedback.

[0025] Example 1 In this embodiment, as Figure 1 As shown, the integrated pump source 1000 includes: A pump source for generating pump light, the pump source comprising multiple light source modules 100; Multiple collimating lens groups are provided, each corresponding to a light source module 100, for collimating the pump light emitted by the corresponding light source module 100; each collimating lens group includes a first collimating lens 200 and a second collimating lens 300 arranged sequentially along the pump light emission direction.

[0026] Multiple reflectors 400 are disposed in the light output path of the collimating lens group. Each reflector 400 corresponds to the collimating lens group and is used to deflect and guide the corresponding collimated pump light to form deflected light. The propagation direction of the deflected light is perpendicular to the propagation direction of the light output from the collimating lens group. A focusing lens 600 is disposed in the light output path of the reflector 400 to focus the deflected light to form a combined beam. A beam splitter 700 is disposed in the light output path of the focusing lens 600 and is used to split the combined light, thereby forming a first-level pump light and a second-level pump light after focusing.

[0027] Specifically, such as Figure 1 As shown, each collimating lens group includes a first collimating lens 200 and a second collimating lens 300 arranged sequentially along the pump light output direction, converting the diverging light spot into a parallel collimated beam. These multiple parallel collimated beams are projected onto the corresponding reflector 400 surface and deflected, forming deflected light. The deflected light enters the focusing lens 600, which performs two-dimensional focusing of the large-aperture parallel beam to form a gradually converging beam. The beam splitter 700 is tilted in the optical path of the beam to physically split the beam, forming the focused first-level pump light and second-level pump light, respectively. Their focal points accurately fall on and are connected to the first output pigtail 800 and the second output pigtail 900, respectively. This design makes the energy distribution of the two output pigtails more direct and efficient.

[0028] Example 2 In this embodiment, as Figure 2 As shown, the integrated pump source 1000 includes: A pump source for generating pump light, the pump source comprising multiple light source modules 100; Multiple collimating lens groups are provided, each corresponding to a light source module 100, for collimating the pump light emitted by the corresponding light source module 100; each collimating lens group includes a first collimating lens 200 and a second collimating lens 300 arranged sequentially along the pump light emission direction.

[0029] A beam splitter 700 is disposed on the output optical path of a collimating lens group away from the first output pigtail 800, and is used to split the collimated light of the collimating lens group to form a first-level pump light and a second-level pump light; wherein the collimating lens outputs collimated light. Multiple first reflectors 401 are disposed in the light output path of the other collimating lens groups. Each first reflector 401 corresponds to one of the other collimating lens groups. The first reflector 401 is used to deflect and guide the collimated light of the corresponding collimating lens group to form first deflected light. The second reflector 402 is disposed in the output light path of the second-level pump light and is used to deflect and guide the second-level pump light to form a second deflected light. The first focusing lens 601 is disposed on the light output path of the first reflector 401 and the beam splitter 701, and is used to focus the first deflected light and the first level pump light to form the focused first level pump light. The second focusing lens 602 is disposed in the light output path of the second reflector 402 and is used to focus the second deflected light to form the focused second-level pump light.

[0030] In this embodiment, only a beam splitter 700 needs to be inserted into a specific optical path to flexibly and with low loss extract the required proportion of pump light from the total system energy to supply a specific port, simplifying the arrangement density of optical components.

[0031] Example 3 In this embodiment, as Figure 3 As shown, the integrated pump source 1000 includes: A pump source for generating pump light, the pump source comprising multiple light source modules 100; Multiple collimating lens groups are provided, each corresponding to a light source module 100, for collimating the pump light emitted by the corresponding light source module 100; each collimating lens group includes a first collimating lens 200 and a second collimating lens 300 arranged sequentially along the pump light emission direction.

[0032] Multiple beam splitters 700 are disposed in the output light path of the collimating lens group. Each beam splitter 700 corresponds to the collimating lens group and is used to split the collimated light of the corresponding collimating lens group to form a first-level pump light and a second-level pump light. Multiple reflectors 400 are provided, each corresponding to a beam splitter 700. Each reflector 400 is disposed on the output light path of the second-level pump light of the corresponding beam splitter 700. The reflector 400 is used to deflect and guide the corresponding second-level pump light to form deflected light. The first focusing lens 601 is disposed on the output light path of the beam splitter 700 and is used to focus the first-level pump light to form the focused first-level pump light. The second focusing lens 602 is disposed in the light output path of the reflector 400 and is used to focus the deflected light to form the focused second-level pump light.

[0033] This embodiment avoids converging all high-power pump light and then subjecting a single beam splitter to a huge thermal load, greatly extending the service life of optical components. Furthermore, it allows for fine distribution by equipping beam splitters with different coating ratios in different channels.

[0034] Example 4 In this embodiment, as Figure 4 As shown, the integrated pump source 1000 includes: A pump source for generating pump light, the pump source comprising multiple light source modules 100; Multiple collimating lens groups are provided, each corresponding to a light source module 100, for collimating the pump light emitted by the corresponding light source module 100; each collimating lens group includes a first collimating lens 200 and a second collimating lens 300 arranged sequentially along the pump light emission direction.

[0035] Multiple first reflectors 401 are disposed in the light output path of the collimating lens group. The first reflectors 401 correspond to the collimating lens group and are used to deflect and guide the collimated light to form a first deflected light. The propagation direction of the first deflected light is perpendicular to the propagation direction of the collimated light. A beam splitter 700 is disposed in the light output path of the first reflector 401 and is used to split the first deflected light to form a first-level pump light and a second-level pump light. A first focusing lens 601 is disposed in the output light path of the first-level pump light to focus the first-level pump light to form a focused first-level pump light. The second reflector 402 is disposed in the output light path of the second-level pump light and is used to deflect and guide the second-level pump light to form a focused second-level pump light. The second focusing lens 602 is disposed in the light output path of the second reflector 402 and is used to focus the deflected second-level pump light to form the focused second-level pump light.

[0036] This embodiment utilizes a single large-aperture beam splitter to distribute the converged beam in a uniform proportion, and, in conjunction with the spatial folding design of the second reflector 402, solves the spatial interference problem when the two output pigtails are installed side by side on the same side.

[0037] In some embodiments, the integrated pump source 1000 further includes a base 1, the base 1 being provided with a mounting groove 10, the mounting groove 10 being divided into a heat sink area 101 and a coupling area 102; The heat sink area 101 is provided with multiple stepped heat sinks, each of which includes a first heat sink 8 and a second heat sink 9 arranged side by side; each of the light source modules 100 is fixed on each of the first heat sinks 8; and related optical devices such as reflectors and beam splitters are fixed on each of the second heat sinks 9.

[0038] The partitioned design of base 1 decouples the functions of heat source management and optical coupling. During operation, the pump light source is concentrated in the heat sink area 101 with high heat dissipation capacity, while the lens group, which undertakes beam transformation and focusing functions, is located in the coupling area 102. This keeps the light source away from the high heat source in physical space and reduces the impact of thermal gradient on the optical coupling accuracy.

[0039] In some embodiments, the plurality of first heat sinks 8 and the plurality of second heat sinks 9 are respectively distributed in a stepped manner from the outer end to the inner end, so that the reflection center of the optical device disposed on the high step surface is higher than the top of the optical device disposed on the low step surface, so that any reflected beam is transmitted to the coupling region 102 without being blocked by the front component.

[0040] The stepped arrangement effectively utilizes the internal height space, so that the reflection center of the optical device on the higher step surface is higher than the top of the component on the lower step surface, providing a three-dimensional lossless channel for optical transmission.

[0041] In some embodiments, the integrated pump source 1000 further includes at least one isolation anti-reflector, which is inclined relative to the output optical axis of the pump light and fixed to the incident side of the corresponding focusing lens. It is used to transmit the pump light transmitted in the forward direction and deflect and block the destructive pulsed back laser that is transmitted in the reverse direction along the corresponding output pigtail.

[0042] Specifically, in Example 1, as Figure 1 As shown, the integrated pump source 1000 includes an isolation anti-reflector 500. The isolation anti-reflector 500 is disposed on the incident light side of the focusing lens 600 (i.e., located in the converging light path between the reflector 400 and the focusing lens 600).

[0043] In Example 2, as Figure 2 As shown, due to having two independent focusing coupling paths, the integrated pump source 1000 includes a first isolation anti-reflector 501 and a second isolation anti-reflector 502. The first isolation anti-reflector 501 is disposed on the light-incident side of the first focusing lens 601 (i.e., on the optical path between the first reflector 401 and the beam splitter 700 and the first focusing lens 601); the second isolation anti-reflector 502 is disposed on the light-incident side of the second focusing lens 602 (i.e., on the converging optical path between the second reflector 402 and the second focusing lens 602).

[0044] In Example 3, as Figure 3 As shown, the integrated pump source 1000 includes a first isolation anti-reflector 501 and a second isolation anti-reflector 502, which are respectively disposed on the light-incident side of the first focusing lens 601 and the second focusing lens 602.

[0045] In Example 4, as Figure 4 As shown, the integrated pump source 1000 includes an isolation anti-reflection device 500, which is disposed on the light-incident side of the first focusing lens 601.

[0046] In all the above embodiments, the surface of the isolation anti-reflector is coated with a multi-band isolation film system. During forward transmission, the isolation anti-reflector has extremely high transmittance for the pump light band, which is used to transmit the focused pump light without damage. During reverse protection, when the external laser resonator or laser amplification stage generates a destructive high-power pulsed back laser and propagates back along the output pigtail, the echo is forcibly blocked by the tilted (e.g., tilted 3°~8°) isolation anti-reflector and deflected into a non-working optical path (e.g., deflected to irradiate the light-absorbing or heat-dissipating material on the inner wall of the base), thereby completely preventing the back laser from returning along the original path and breaking down or burning the front-end light source module 100.

[0047] To achieve highly reliable power supply to the high-energy pump source array, a conductive loop structure is precisely arranged on the surface or lateral edge of the first heat sink 8. Near the stepped functional position of the first heat sink 8, a first conductive rail 5 and a second conductive rail 6 are arranged in parallel, and pins 7 extend from them. After an external driving current is injected into the pins 7, it drives each light source module to emit light synchronously along the conductive rails.

[0048] In some embodiments, the integrated pump source 1000 further includes a driving circuit; the driving circuit is electrically connected to the plurality of light source modules 100 and is used to drive the pump source. Under the premise that the total output energy of the integrated pump source is constant, the distribution ratio of the first-level pump light and the second-level pump light to the total energy is adjusted by configuring the transmission and reflection ratio of the beam splitter. Synchronous lighting and power adjustment of the entire light-emitting component can be achieved using a single driving circuit, reducing electrical complexity.

[0049] The beam splitter is a beam splitter whose reflectivity and transmittance are controlled by a coating; or, the beam splitter is a beam splitting prism with a half-wave plate, and the energy distribution ratio is adjusted by adjusting the optical axis angle of the half-wave plate. By changing the beam splitter with different coating parameters or adjusting the angle of the half-wave plate, the different energy requirements of different lasers for the oscillation stage and amplification stage can be flexibly adapted.

[0050] An embodiment of an acousto-optic Q-switched pulsed fiber laser system, such as Figure 5 As shown, it includes: Laser resonator 1401; The laser amplification stage 1601 is connected to the optical output terminal of the laser resonant cavity 1401; Output module 1701 is connected to the optical path output terminal of laser amplification stage 1601; and The integrated pump source 1000 described in any of the above embodiments; The first output pigtail 800 of the integrated pump source 1000 is optically coupled to the input end of the laser resonant cavity 1401, and is used to provide the first-level pump light to the laser resonant cavity 1401. The second output pigtail 900 of the integrated pump source 1000 is coupled to the side arm pump light of the laser amplification stage 1601, and is used to provide the second-level pump light to the laser amplification stage 1601.

[0051] In some embodiments, the laser resonant cavity 1401 includes a high reflectivity grating 1100, a first-stage gain fiber 1200, an acousto-optic modulator 1300, and a low reflectivity grating 1400 connected sequentially along the optical path. The input fiber of the high reflectivity grating 1100 is optically coupled to the first output pigtail 800 of the integrated pump source; the output fiber of the low reflectivity grating 1400 is optically coupled to the laser amplification stage 1601.

[0052] In some embodiments, the laser amplification stage 1601 includes a beam combiner 1500 and a second-stage gain fiber 1600; The side arm pump fiber of the combiner 1500 is fused to the second output pigtail 900 of the integrated pump source; the signal input fiber of the combiner 1500 is also fused to the low reflectivity grating 1400. The input end of the second-stage gain fiber 1600 is fused to the output end of the combiner 1500.

[0053] In some embodiments, the connection points between the first output pigtail 800 and the high-reflectivity grating 1100, the connection points between the second output pigtail 900 and the pump fiber of the side arm of the combiner 1500, and the connection points between the low-reflectivity grating 1400 and the input fiber of the second-stage gain fiber 1600 are all covered with a low-refractive-index optical adhesive. It should be noted that the low-refractive-index optical adhesive is used to strip cladding stray light and reduce interface coupling loss; in practical applications, this optical adhesive can be a glue.

[0054] In some embodiments, the output module 1701 further includes a free-space output isolator 1700; the input end of the free-space output isolator 1700 is connected to the output fiber of the final laser amplification stage 1601 via a second connection 1002, generating a physical return loss of up to 30dB or more on the back-propagating signal echo, thus blocking the risk of damage to the core components inside the laser from the echo. To handle the high-energy pump residual light that may overflow at the fusion splice and to protect the fiber coating, the surface of the second connection 1002 may be covered with a high-refractive-index optical adhesive to achieve efficient extraction of stripped light energy.

[0055] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0056] The above embodiments merely illustrate several implementation methods of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this patent should be determined by the appended claims.

Claims

1. An integrated pump source, characterized by, It includes at least one beam splitter, multiple reflectors, and at least one focusing lens, and further includes: A pump source for generating pump light, the pump source comprising multiple light source modules; Multiple collimating lens groups, each corresponding to a light source module, are used to collimate the pump light emitted by the corresponding light source module. The beam splitter is disposed in the light output path of at least one of the collimating lens group, the focusing lens, and the reflector, and is used to split at least one of the light output from the collimating lens group, the light output from the focusing lens, and the light output from the reflector, and after splitting, form a first-level pump light and a second-level pump light allocated according to a preset ratio. The reflector is disposed in the light output path of the collimating lens group and / or the beam splitter, and is used to deflect and guide at least a portion of the light output from the collimating lens group and / or the beam splitter. The focusing lens is disposed in the light output path of the reflector and / or the beam splitter, and is used to focus the light output from the reflector and / or the beam splitter; The first output pigtail is used to receive the focused first-level pump light and output it outward; the output direction of the focused first-level pump light is towards the first output pigtail. The second output pigtail is used to receive the focused second-level pump light and output it outward, wherein the output direction of the focused second-level pump light is toward the second output pigtail.

2. The integrated pump source of claim 1, wherein, The integrated pump source also includes at least one isolation anti-reflector, which is inclined relative to the outgoing optical axis of the pump light and is located on the incident side of the focusing lens. It is used to transmit the forward-transmitting pump light and deflect and block the reverse-transmitting return laser light.

3. The integrated pump source of claim 1, wherein, The integrated pump source also includes a driving circuit, which is electrically connected to multiple light source modules and is used to drive the pump source. Under the premise that the total output energy of the integrated pump source is constant, the distribution ratio of the first-level pump light and the second-level pump light to the total energy is adjusted by configuring the transmission and reflection ratio of the beam splitter.

4. The integrated pump source of claim 1, wherein, The beam splitter is a beam splitter whose reflectivity and transmittance are controlled by coating. Alternatively, the beam splitter is a beam splitting prism with a half-wave plate, and the energy distribution ratio can be adjusted by adjusting the optical axis angle of the half-wave plate.

5. The integrated pump source of claim 1, wherein, The integrated pump source includes: Multiple reflectors are disposed in the light output path of the collimating lens group. The reflectors correspond to the collimating lens group and are used to deflect and guide the corresponding collimated pump light to form deflected light. The propagation direction of the deflected light is perpendicular to the propagation direction of the light output from the collimating lens group. A focusing lens is disposed in the light output path of the reflector to focus the deflected light into a combined beam. A beam splitter is disposed in the light output path of the focusing lens to split the combined light, thereby forming a first-level pump light and a second-level pump light after focusing. Alternatively, the integrated pump source may include: A beam splitter is disposed on the output light path of the collimating lens group away from the first output pigtail side, and is used to split the collimated light of the collimating lens group to form a first-level pump light and a second-level pump light; wherein the collimating lens outputs collimated light. Multiple first reflectors are disposed in the light output path of the remaining collimating lens groups. Each first reflector corresponds to one of the remaining collimating lens groups. The first reflector is used to deflect and guide the collimated light of the corresponding collimating lens group to form first deflected light. The second reflector is disposed in the output light path of the second-level pump light and is used to deflect and guide the second-level pump light to form the second deflected light. A first focusing lens is disposed in the light output path of the first reflector and the beam splitter, and is used to focus the first deflected light and the first level pump light to form the focused first level pump light. The second focusing lens is disposed in the light output path of the second reflector and is used to focus the second deflected light to form the focused second-level pump light; Alternatively, the integrated pump source may include: Multiple beam splitters are disposed in the output light path of the collimating lens group. Each beam splitter corresponds to the collimating lens group and is used to split the collimated light of the corresponding collimating lens group to form a first-level pump light and a second-level pump light. Multiple reflectors, each corresponding to a beam splitter, are disposed on the output light path of the second-level pump light of the corresponding beam splitter. The reflectors are used to deflect and guide the corresponding second-level pump light to form deflected light. A first focusing lens is disposed on the output light path of the beam splitter to focus the first-level pump light to form the focused first-level pump light. The second focusing lens is disposed in the light output path of the reflector to focus the deflected light to form the focused second-level pump light; Alternatively, the integrated pump source may include: Multiple first reflectors are disposed in the light output path of the collimating lens group. The reflectors correspond to the collimating lens group and are used to deflect and guide the collimated light to form first deflected light. The propagation direction of the first deflected light is perpendicular to the propagation direction of the collimated light. A beam splitter is disposed in the light output path of the first reflector to split the first deflected light to form a first-level pump light and a second-level pump light. A first focusing lens is disposed in the light output path of the first-level pump light to focus the first-level pump light to form a focused first-level pump light. The second reflector is disposed in the output light path of the second-level pump light and is used to deflect and guide the second-level pump light to form a focused second-level pump light. The second focusing lens is disposed in the light output path of the second reflector to focus the deflected second-level pump light to form the focused second-level pump light.

6. The integrated pump source of claim 1, wherein, The integrated pump source also includes a base, which has a mounting groove. The mounting groove is divided into a heat sink area and a coupling area. The heat sink area has multiple stepped heat sinks, each of which includes a first heat sink and a second heat sink arranged side by side. Each of the light source modules is fixed on each of the first heat sinks. At least some of the optical components in the reflector, beam splitter, and focusing lens are fixed on each of the second heat sinks.

7. An acousto-optically Q-switched pulsed fiber laser system, characterized in that, include: Laser resonant cavity; A laser amplification stage is connected to the optical output terminal of the laser resonant cavity; The output module is connected to the optical path output terminal of the laser amplification stage; as well as The integrated pump source as described in any one of claims 1 to 6; The first output pigtail of the integrated pump source is optically coupled to the input end of the laser resonant cavity to provide the first-level pump light to the laser resonant cavity; The second output pigtail of the integrated pump source is coupled to the pump light of the side arm of the laser amplification stage, and is used to provide the second-level pump light to the laser amplification stage.

8. The acousto-optic Q-switched pulsed fiber laser system according to claim 7, characterized in that, The laser resonant cavity includes a high reflectivity grating, a first-stage gain fiber, an acousto-optic modulator, and a low reflectivity grating connected sequentially along the optical path. The input fiber of the high reflectivity grating is optically coupled to the first output pigtail of the integrated pump source; the output fiber of the low reflectivity grating is optically coupled to the laser amplification stage.

9. The acousto-optic Q-switched pulsed fiber laser system according to claim 7, characterized in that, The laser amplification stage includes a beam combiner and a second-stage gain fiber. The side arm pump fiber of the combiner is fused to the second output pigtail of the integrated pump source; The optical fiber at the signal input end of the combiner is also fused to the low-reflectivity grating. The input end of the second-stage gain fiber is fused to the output end of the combiner.

10. The acousto-optically Q-switched pulsed fiber laser system of claim 7, wherein, The connection between the first output pigtail and the high reflectivity grating, the connection between the second output pigtail and the pump fiber of the combiner side arm, and the connection between the low reflectivity grating and the input fiber of the second-stage gain fiber are all covered with low-refractive-index optical adhesive.

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